Research Article |
Corresponding author: Kathryn E. Perez ( perezke@gmail.com ) Academic editor: Matthew L. Niemiller
© 2023 Kathryn E. Perez, Yamileth Guerrero, Roel Castañeda, Peter H. Diaz, Randy Gibson, Benjamin Schwartz, Benjamin T. Hutchins.
This is an open access article distributed under the terms of the CC0 Public Domain Dedication.
Citation:
Perez KE, Guerrero Y, Castañeda R, Diaz PH, Gibson R, Schwartz B, Hutchins BT (2023) Two new phreatic snails (Mollusca, Caenogastropoda, Cochliopidae) from the Edwards and Edwards-Trinity aquifers, Texas. Subterranean Biology 47: 1-27. https://doi.org/10.3897/subtbiol.47.113186
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The Edwards and Edwards-Trinity Aquifers of Texas have diverse stygofauna, including fifteen species of snails found in phreatic and hyporheic habitats. These species have the hallmarks of adaptation to subterranean environments including extremely small body size and the loss of pigmentation and eyes. Here we use an integrative taxonomic approach, using shell, radula, and anatomical features as well as mitochondrial and nuclear DNA data, to circumscribe a new genus and two new cavesnail species from Central Texas. Vitropyrgus lillianae gen. et sp. nov. is described from Comal Springs (Comal County) and Fessenden Springs (Kerr County) and distinguished by a glassy, highly sculptured shell and distinctively simple, unornamented penial morphology. We also describe Phreatodrobia bulla sp. nov. from Hidden Springs (Bell County), and several other springs in Bell & Williamson Counties, Texas. This species has a smooth, unsculptured teleoconch, a reflected and flared lip, and deeply concave operculum.
Cave snails, Edwards Trinity Aquifer System, groundwater, hyporheic, phreatic, spring
The Edwards, Trinity, and Edwards-Trinity aquifers, constitute a large, interconnected karst aquifer systems in Texas and Northern Mexico and provide habitat for a diverse stygofauna (
Cave or phreatic snails inhabit groundwater systems such as subterranean streams and aquifers (
Phreatic snails of the Edwards and Edwards-Trinity Aquifers are all members of the Cochliopidae Tryon, 1866, a group of small freshwater and estuarine snails, comprising 260+ species found in the Nearctic, Neotropical, and Afrotropical regions of the world (
Groundwater was sampled using different methods as appropriate for the substrate or habitat (Fig.
Spring sites in Texas. Type locality of Vitropyrgus lillianae gen. et sp. nov. Comal Springs Upwelling #7, New Braunfels, Comal County A at normal water flow conditions, photo by Marcus Gary B at low water flow conditions, photo by Randy Gibson C drift nets in water flow at Fessenden Springs, Kerr County, photo by K.E. Perez D type locality of Phreatodrobia bulla sp. nov. Hidden Springs, Bell County, photo by P. Diaz E Robertson spring run hyporheic sampling site, Bell County, photo by K.E. Perez.
Map with known localities for Vitropyrgus lillianae gen et. sp. nov. and Phreatodrobia bulla sp. nov. The Edwards-Trinity Aquifer System is shown in gray shades with the lightest shade indicating the Edwards-Trinity, the medium gray indicating the Trinity, and the darkest portion indicating the Edwards portions. Major cities are indicated with a star and name label. Inset maps indicate the region of North America and state of Texas.
Types and paratypes are deposited in the Philadelphia Academy of Natural Sciences at Drexel University (
Photovouchers were created prior to DNA extraction since the procedure resulted in the dissolution of fragile shells (Suppl. materials
Following sequencing, Geneious 10.2.6 was used to assemble contigs, trim and visually inspect sequences, and align them using the MUSCLE algorithm. Model selection (
For the nuclear LSU gene an alignment with all available sequences (23) was generated using MUSCLE as implemented at https://www.ebi.ac.uk/Tools/msa/muscle/ and analyzed in IQ-TREE with 10,000 ultra-fast bootstrap replicates. Other Cochliopidae were not available for this locus, so Pyrgulopsis Call & Pilsbry, 1886 species were used as the outgroup. Model selection was conducted in IQ-TREE using the Bayesian Information Criterion (BIC). For the 74-terminal alignment for COI, the following models were used for 1st positions: TNe+I+G4, 2nd positions: TPM3u+F+I+G4, and 3rd positions: HKY+F+G4. For the LSU alignment (23 terminals) HKY+F+I+G4 was identified as the best fit model. Mega 11 was used to calculate P-distance (
Anatomical terms follow recent works (
Scanning electron micrograph (SEM) images of Vitropyrgus lillianae gen. et sp. nov. were acquired using the methods of
Phreatic snails were examined from 35 sites for this study (Suppl. material
An alignment of 74 COI sequences with 657 characters, 264 parsimony-informative, was analyzed using maximum likelihood. The ML tree (Fig.
Highest likelihood trees resulting from maximum-likelihood analysis of COI alignment. Ultra-fast bootstrap values >95% are shown with black branches, 50–94% with gray branches and <50 with dashed gray branches. Terminals are labeled with Genbank voucher numbers, species, and sampling locality for our focal taxa. Type localities are indicated with an *. The new species and select relatives are figured.
The LSU alignment had 23 sequences, 947 characters, with 224 parsimony-informative. A single ML tree with a score of -3416.312 was found (Fig.
Highest likelihood trees resulting from maximum-likelihood analysis of LSU alignment. Ultra-fast bootstrap values >95% are shown with black branches and 50 –94% with gray branches. Terminals are labeled with Genbank voucher numbers, species, and sampling locality for our focal taxa. Type localities are indicated with an *.
Subclass Caenogastropoda Cox in Moore, 1960
Order Littorinimorpha Golikov & Starobogatov, 1975
Superfamily Truncatelloidea Gray, 1840
Family Cochliopidae Tryon, 1866
Vitropyrgus lillianae gen. et sp. nov.
Minute shell with spiral and collabral sculpture on teleoconch that extends to sutures. Embryonic whorl distinctively sculptured with wrinkles giving a malleated appearance. Aperture ovate to round, with slightly reflected lip near umbilicus. Umbilicus open. Animal eyeless and unpigmented. Penis attached behind right eye position, simple in glandular structure. The single known species of Vitropyrgus is a quarter of the size of related epigean taxa and is adapted to a subterranean environment (e.g., lacking pigmentation, eyes, and ctenidia). Simple penial morphology lacking the papillae or apocrine glands that define other members of Cochliopidae. Finally, the shell has a distinctive clear and glassy appearance, lacking the tan color of Tryonia or Stygopyrgus Hershler & Longley, 1986 or the usual translucency of Phreatodrobia.
Shells and anatomical features of Vitropyrgus lillianae gen. et sp. nov. All localities in Texas A–C holotype, Comal Springs, Comal County, ANSP 494654 D shell frontal view of individual from Fessenden Springs, Kerr County, ABC 005622 E SEM of embryonic whorls to detail sculpture F SEM of rear shell and sculpture G SEM of teleoconch sculpture H SEM of operculum, outer view I penis, ventral view J penis, dorsal view. The yellow coloration in I and J is caused by immersion in Bouin’s solution, the tissues are white, unpigmented in life.
The most recent review of Cochliopidae (
We do not attempt to place this genus among the subfamilies of Cochliopidae. The COI phylogeny has limited resolution at this level, we have limited sampling in LSU for placement among subfamilies. The COI tree places Vitropyrgus close (with no support) to a clade that included Heleobia (Semisalsinae) and Onobops (Littoridinae). Members of Semisalsinae are diagnosed by penial papillae or apocrine glands (
Vitropyrgus is proposed as a new genus with the following rationale. First, it was found by COI and LSU phylogenies sister to epigean taxa. In the COI phylogeny, Vitropyrgus is most closely related to members of the Heleobia and Onobops. Divergence in COI between Vitropyrgus and other members of that clade averaged 16.0% with a range from 15.5–16.6. Intergeneric comparisons in our dataset averaged 16.54% with a range from 5.19–25.37. This places the level of divergence between Vitropyrgus and its closest known relatives within the range of intergeneric divergence and just under the average for the Texas genera. In other groups of subterranean hydrobioids the range of 14.5–16.7% has been used to justify genus level distinction (
Stygopyrgus bartonensis,
Stygopyrgus bartonensis,
USA, Texas. Comal County, New Braunfels, Comal Spring Upwelling #7, (29.7135, -98.1370).
All sites are in Texas, USA. Holotype – Comal County, Landa Park, New Braunfels, Comal Spring Upwelling #7, (29.7135, -98.1370), drift net, collected by Randy Gibson, 2 May 2019 (ANSP 494654). Paratypes – Comal County, Landa Park, New Braunfels, Comal Spring Upwelling #7, (29.7135, -98.1370), drift net, collected by Randy Gibson, 1–5 June 2018 (ANSP 494656).
– Kerr County, Fessenden Spring, near Heart of the Hills Fisheries Science Center (30.1670, -99.3427), drift net, collected by K.E Perez, D. Deshommes, N. Loveland, 4–6 November 2020 (ABC 005622).
Minute shell with glassy appearance, with distinctive spiral and collabral sculpture on teleoconch that extends to sutures. Vitropyrgus lillianae differs from similar species in the region by shell shape, sculpture, or shell color. Stygopyrgus bartonensis has a taller, more columnar, and less heavily sculptured shell. The shell of S. bartonensis also has a pale brown tint in fresh shells that is not present in V. lillianae. The animals most easily confused with V. lillianae are very juvenile individuals of Pyrgophorus spinosus (Call & Pilsbry, 1886). While their sculpture can appear quite similar, juvenile P. spinosus are much larger, have a white base color and the aperture forms an oval, completely appressed to the body whorl. Pyrgulopsis spinosus shells have a more steeply tapering spire than V. lillianae. Dissection and comparison of penial anatomy will readily distinguish V. lillianae due to its simple structure with no papillae or apocrine glands.
Shell very small, clear, glassy, heavily sculptured, ovate-conic with rounded whorl outlines (Fig.
First whorl of protoconch slightly elevated, separated from subsequent whorls (Fig.
Unpigmented body visible through shell. Snout nontapered, about as long as wide, with strong distal lobation. Foot short, anterior portion rounded, anterior edge indented, without lateral wings. Cephalic tentacles tapered, rounded, unpigmented, with no visible cilia, about 5 times as long as wide. Mantle tissue unpigmented. No visible eyes and no visible pigment at base of eyestalks. No ctenidium observed, osphradium rounded.
Intestine uncoiled, mostly filled with rounded fecal pellets, rectum exiting in pallial cavity, near mantle edge on right side of head. Esophagus entering stomach below, smaller posterior chamber with large digestive gland aperture and larger anterior chamber. Stomach speckled with dark flecks of pigment. Caecum not observed.
Penis large relative to body size tapering, attached well behind right eye, with an expanded, muscular base, narrow body segment, tapering to a distal tip (Figs
Central radular tooth with indented dorsal edge (Fig.
We use the generic name “Vitropyrgus” reflecting the glassy appearance of the shell of this phreatic snail compared to related groups. The specific epithet “lillianae” is in honor of Dr. Lillian E. Perez, the first author’s mother. We propose the common name “glass cavesnail”.
This new snail species is found among other phreatic snail fauna in Comal Springs including: Phreatodrobia nugax (Pilsbry & Ferriss, 1906), Phreatodrobia plana Hershler & Longley, 1986, Phreatodrobia spica K. E. Perez & Alvear, 2020, and Phreatodrobia rotunda Hershler & Longley, 1986. Other members of this unique subterranean fauna include the federally endangered amphipod Stygobromus pecki (Holsinger, 1967), the federally endangered dryopid beetle Stygoparnus comalensis Barr & Spangler, 1992, an undescribed stygobiontic salamander, and many other invertebrates (
This species is known from two localities in the karstic Edwards and Edwards-Trinity Aquifers, separated by ~125 km. Comal Springs is the largest spring in Texas (mean annual discharge = 8.4 m3/s, (
Fessenden Spring on Johnson Creek is a smaller spring that is part of the large regional Edwards-Trinity Aquifer system. Fessenden Spring discharges from the base of the Edwards Limestone in the central Texas Hill Country and is one of many Edwards-Trinity springs that support baseflows in the headwater reaches of the Guadalupe River. Across much of the southeastern portion of this aquifer, springs discharge into streams and rivers in the contributing zone for the Edwards Aquifer. The Edwards-Trinity system is hydrologically connected to the Edwards Aquifer along the Balcones Fault zone through both groundwater and surface-water linkages. The Guadalupe River is the only river in the contributing zone to not consistently lose much or all its flow to the Edwards Aquifer as it crosses the aquifer recharge zone (
In the boundary zone between the two aquifer systems, movement of organisms across blurry hydrologic boundaries between the aquifers is possible. Additionally, there is increasing evidence that the hyporheic zone along river corridors can provide important habitat and connectivity for a variety of Texas groundwater taxa, including snails (
The species superficially resembles Stygopyrgus bartonensis in overall shell form and sculpture and was initially identified as that species (e.g.
Subclass Caenogastropoda Cox in Moore, 1960
Order Littorinimorpha Golikov & Starobogatov, 1975
Superfamily Truncatelloidea Gray, 1840
Family Cochliopidae Tryon, 1866
Genus Phreatodrobia Hershler & Longley, 1986
Phreatodrobia cf imitata Perez et al., 2020, pp. 7.
Phreatodrobia conica
USA, Texas, Bell County, Hidden Springs (30.9382, -97.6044).
All sites are in Texas, USA. Holotype and Paratypes – Bell County, Hidden Springs, collected by Peter Diaz (30.9382, -97.6044), 27 October 2021 (ANSP 494658, 494660).
– Bell County, Salado Springs Complex, Anderson Spring (30.9441, -97.5347); Stagecoach Inn Cave, Salado (30.9432, -97.5375), 1 May 2020, P. Diaz (ABC 005618); Copperhead Spring Cave, Ft. Cavazos (confidential location); Bent Oak Spring (30.8916, -97.7092), 17 August 2022 (ABC 005616); Gault Archaeological Site Spring (30.8916, -97.7095), 8 June 2019 (ABC 005615); Robertson Springs, Creek Springs (30.9445, -97.5413); Solana Ranch Spring (30.8997, -97.6390), 25 March 2020 (ABC 005620), P. Diaz; Spicewood Creek Pipe Spring (confidential location); Spring 23-398, Ft. Cavazos (confidential location); Camp Tahuaya, Tahuaya Spring Pool (31.0087, -97.5093). – Williamson County, PC Spring (30.4818, -97.7419), 23 March 2023 (ABC 005617).
Shell translucent, conical, with nearly smooth teleoconch, dome-shaped protoconch with wrinkles. Aperture round to slightly ovate, usually separated from body whorl in adults. Mantle tissue white, unpigmented. Sharply pointed median cusp of central radular teeth with small basal cusp. Penis long, equal width most of the length, tapering sharply near tip, loosely to tightly coiled, length 2–3 times length of snout.
Shell translucent, usually pale tan, conical with 3.5–4.5 well rounded whorls (Fig.
Shells and anatomical features of Phreatodrobia bulla sp. nov. All sites are in Texas A–C holotype, Hidden Springs, Bell County, ANSP 494658 D SEM of individual from Hidden Springs, Bell County ANSP 494660 E–G SEM of embryonic shell sculpture H SEM of operculum, inner surface I dorsal view of body J ventral view of penis K dorsal view of penis. Scale bars: 100 µm (A–E); 100 µm (J, K).
Operculum round to broadly ovate, concave, amber in color, deeply concave, with narrow band of thinner material on outer margin, tapering to a point but without nuclear peg (Fig.
Body visible through translucent shell. No eyes present. Ctenidium composed of triangular filaments, approximately as broad as high, stretching from posterior portion of pallial cavity nearly to mantle edge. Osphradium oval shaped, elongate, positioned opposite posterior portion of ctenidium, occupying ~25% of pallial cavity. Pallial portion of intestine with loops in posterior portion of pallial cavity similar to P. imitata. Fecal pellets in the coiled intestine usually clearly visible through the shell, bright orange, oval-elongate in shape (Fig.
Snout narrow, longer than wide, deeply lobate distally, with folds along sides. Tentacles tapered, with scattered granules or pigmentation at base, length equal to snout. No eye visible. Foot rounded anteriorly, with lateral wings. Penis base well behind right tentacle, slightly wider and with deeper folds near base, tapering quickly to a consistent length until sharply tapering at tip. Slight folds continue until midway along penis length. Penis long, loosely to tightly coiled, curved and 2–3 times longer than snout (Fig.
Central radular tooth with deeply indented dorsal edge; central cusp longer than adjacent cusps; lateral cusps 5–6 on each side, evenly decreasing in width towards tip, sharply pointed; basal cusps small, triangular; basal socket deep, v-shaped. Lateral tooth rectangular, with a longer central cusp and 4 (inner) – 7 (outer) cusps on either side. Some laterals with wide deposit down mid-line. Base of lateral tooth with triangular, well excavated ventral process, tapering to wing. Inner marginal teeth with ~25–30 cusps, similar in length, decreasing slightly in outermost cusps. Tooth surface tapering towards outer wing with narrow neck before flaring smoothly towards the base. Outer marginal teeth rounded, spoon-shaped, wide at top, smoothly curving, with 12–20 small cusps, tapering slightly to short neck.
We use the specific epithet “bulla” from the latin for “bubble”, referring to the rounded appearance of each whorl, particularly the rounded spire. We propose the common name “Brown’s cave snail” in honor of Mr. Tim Brown, a Bell County native and former Commissioner who has worked extensively to promote conservation of archaeological and groundwater resources in the region.
This new species is part of a diverse aquifer community. Relative abundance varies across the range of the species. At Creek Springs (part of the Robertson Springs Complex), as many as 200 snails can be captured over a couple of days of drift net collection, whereas at PC Springs, similar sampling effort yields only one or a few specimens. Phreatodrobia bulla sp. nov. is often collected with other phreatic snails: P. nugax, P. micra (Pilsbry & Ferriss, 1906), and Phreatoceras taylori (
All known localities for Phreatodrobia bulla sp. nov. are springs or hyporheic samples taken near springs discharging from the northern segment of the karstic Edwards Aquifer (north of the Colorado River). The northern segment lies adjacent to, but is disconnected from, the Barton Springs segment of the Edwards Aquifer, with the Colorado River a topographic low that forms the boundary between the two segments. Faults, erosion, and other geologic and geomorphic factors in the northern segment have resulted in groundwater basins that are relatively smaller and more dissected than in the Barton Springs and San Antonio segments to the south (
Currently, P. bulla sp. nov., is known from 12 sites across a range of approximately 680 km2. Occurrence at multiples sites provides some security against catastrophic events (redundancy, sensu
Intraspecific and interspecific sequence divergence averaged 2.45% and 10.73%, respectively, in our dataset of Texas phreatic snails. Phreatodrobia bulla has an average sequence divergence of 10.34% with the other members of Phreatodrobia and Phreatoceras, and 6% divergence with its sister Phreatoceras taylori. Interspecific variability in COI has been examined in several groups of subterranean hydrobioid gastropods inhabiting karstic environments. In Belgrandiella A. J. Wagner, 1928 “species” (Hydrobiidae) COI divergence ranged from 5.2–9.9% (
Lacking circumscription, Phreatodrobia bulla has been previously identified in recent literature (
Phreatodrobia imitata and P. bulla share the same general shell shape and highly flared aperture (Fig.
Shells of the species described here compared to shells of similar species in the region. All localities are in Texas A Vitropyrgus lillianae gen. et sp. nov. Comal Springs, Comal County B Stygopyrgus bartonensis, Barton Springs, Travis County C Phreatodrobia imitata, Verstræten Well, Bexar County D Pyrgophorus spinosus juvenile, San Marcos River, near Martindale, Guadalupe/Caldwell County Line E Phreatodrobia bulla sp. nov. PC Spring, Williamson County.
Previous classification efforts have not determined the placement of Phreatodrobia and Phreatoceras within a subfamily of Cochliopidae (
Comparison of morphological features of Phreatoceras and Phreatodrobia with P. bulla sp. nov.
Character | Phreatoceras | Phreatodrobia spp. | P. bulla sp. nov. |
---|---|---|---|
Shell shape | horn-like | planispiral, trochoid, conical | conical |
Protoconch sculpture | pitted/wrinkled microsculpture | pitted microsculpture | wrinkled |
Teleoconch sculpture | smooth | variable | regular collabral growth lines |
Aperture | simple | flared | flared |
Operculum | near circular, concentric, multispiral, large ventral central process. | Round to oval, non-concentric, nucleus subcentral, sometimes with central knob | Oval, non-concentric, nucleus subcentral with ventral mound |
Ctenidium | absent | absent, nearly absent, present | present |
Radula - central tooth | central cusp long, basal tooth long at origin of lateral angle | central cusp long or not, basal cusp present or not at origin of lateral angle | central cusp long, basal tooth long at origin of lateral angle |
Penial morphology | tight coil | coil or uncoiled | coiled |
We propose two potential explanations for the sister relationship of P. bulla and Phreatoceras taylori. In this study, we have not sampled the type locality of Phreatoceras, so it is possible that snails with a trumpet-shaped shell that we sampled in Bell County are not Phreatoceras taylori sensu stricto, described from Real County, Texas, ~250 km distant. Alternatively, Phreatoceras may be better considered a morphologically divergent member of Phreatodrobia rather than a separate genus. We have observed other species of Phreatodrobia, such as P. nugax, with a loosely coiled or partially uncoiled shell in some individuals, lending some observational support to this possibility. Examination and sequencing of Phreatoceras taylori from the type locality, is needed to resolve its relationship to Phreatodrobia.
We thank UTRGV School of Integrative Biological and Chemical Sciences and the College of Sciences. Funding for DNA data collection provided by U.S. Army Corps of Engineers (Project number W912HZ2120033). Sampling supported by several agencies: City of Austin (grant # NA190000181); Clearwater Underground Water Conservation District; and Texas Parks and Wildlife Department (U.S. Fish and Wildlife Service, TPWD Interagency Cooperation Contract #532109). We thank many students for DNA data collection: Dominique Alvear, Vanessa Saenz, Natalia Salazar-Lozano, Mariana Gonzalez Tiscareño, Evan Guerrero, Manuel Spor Leal, Taylor Villanueva, Christina Ortega, Megan Solis, Jonathan Dominguez, and Mercedes Serrano. We thank the following for assistance with collections for this study: Didier Deshommes, Peter Sprouse, Jessica Gordon, Zara Environmental, Chase Corrington, Ashley Casarez, Weston Nowlin, Victor Castillo, III, Nate Bendik, Nick Loveland, Jack Johnson, Thomas Devitt, Valentin Cantu, Sarah Donelson, and Patricia Duncan. The Texas State University Analysis Research Service Center facilitated use of a scanning electron microscope, and Joyce Anderson provided technical guidance for SEM imaging. Tom Eubanks and Satinderpal Kaur at UTRGV provided SEM assistance. Martin Haase provided advice on imaging and handling of minute subterranean snails. We thank the curators and collections staff at the Texas Memorial Museum, United States National Museum, Texas State University Aquifer Biodiversity Collection, and Academy of Natural Sciences of Philadelphia, especially James Reddell and Paul Callomon. The views presented herein are those of the authors and do not necessarily reflect those of the U.S. Fish and Wildlife Service.
List of specimens, including their sampling localities and voucher information
Data type: xlsx
Explanation note: *denotes type localities. Alphanumeric identifiers correspond to Genbank accession numbers. USNM = United States National Museum, Smithsonian Institution; ANSP = Academy of Natural Sciences of Philadelphia at Drexler University, TMM = Texas Memorial Museum, ABC = Texas State University Aquifer Biodiversity Collection.
Photo-vouchers of individuals sampled for DNA or radula, Vitropyrgus lillianae gen. et sp. nov. and Stygopyrgus bartonensis
Data type: tif
Explanation note: Shells are destroyed during both procedures. Photo vouchers are supplied here and paravouchers deposited in museum collections. All localities are in Texas. Vitropyrgus lillianae gen. et sp. nov., Comal Springs, Comal County, TX A OR372116 B OR372117, OR391734 C OR391731 D OR391732 E OR391733, Paravouchers (paratypes) = ANSP 494656; Stygopyrgus bartonensis, Parthenia Springs in Barton Springs Pool, Travis County, TX F OR391735 G OR372120 H OR372121, OR391737 I OR391738 J OR372122, OR391739 Paravouchers = ABC 003350; Old Mill Springs, Travis County, TX K OR391740 L OR391741; M OR372123, OR391742 N OR372124, Paravouchers = ABC 003357; ABC 003358; Camp Aransas Springs, Travis County, TX O OR372131, Paravouchers = ABC 005621. Scale bar: 0.5 mm.
Photo-vouchers of individuals sampled for DNA or radula, Phreatodrobia bulla sp. nov.
Data type: tif
Explanation note: Shells are destroyed during both procedures. Photo vouchers are supplied here and paravouchers deposited in museum collections. All localities are in Texas. Phreatodrobia bulla sp. nov. Hidden Springs, Bell County, TX A–N Hidden Springs, Bell County, TX, Paravouchers = USNM 157128, radula specimens. Solana Ranch, Bell County, TX, Paravouchers = ABC 005620 O OR372111 P OR372112, OR391730 Q OR391729 R Anderson Spring, Bell County, TX MN974229. Paravouchers = USNM 1571284. Locality information in Suppl. material
Photo-vouchers of individuals sampled for DNA
Data type: tif
Explanation note: All localities are in Texas. Balconorbis uvaldensis, Uvalde Fish Hatchery, Uvalde County A OR372125; Sycamore Creek at HWY 277, Uvalde County B OR372126 C OR372127 D OR372128 E OR372129; Cochliopina riograndensis, Lake Amistad National Recreation Area, small spring 25 m W of Indian Springs, Val Verde County F OR372132; Phreatodrobia imitata, Aldridge Well, Bexar County G OR372130; Phreatodrobia micra, San Marcos River at Scull Road Crossing, Hays County H OR372134 I OR372135, OR391744; Phreatodrobia nugax, Little Hunt Spring, Travis County J OR372107 K OR372108 L OR372109 M OR372110, Paravouchers = TMM 12388; Phreatodrobia rotunda, Comal Springs, Comal County N OR372113 O OR372118; Phreatodrobia spica, Garden Ridge Well, Comal County P OR372133; Texapyrgus longleyi, Lake Amistad National Recreation Area, small spring 25 m W of Indian Springs, Val Verde County Q OR372115. Locality information in Suppl. material