Amphicutis stygobita ventral SEMs A disk and 1 or 2 segments of each arm distal to disk, 1 complete segment within disk but outside mouth slit at CP6 and CP 8, 1.5–2 segments within disk at CP 11, CP 1, and CP 3 B oral frame showing mouth structures (see Fig. 9 for labelled structures) C base of arm at CP8 from Fig. 8A, 1 complete segment within disk with LAPs, tentacle scales, and VAPs, interbrachial areas with scales D 1st segment beyond disk with LAP, V with lateral extensions E V from proximal area of arm, large podian basin, distal to right, length 1.4 × width F V from mid-section of arm, distal to right, length ~3 × width. Abbreviations as in Fig. 7 plus TS - tentacle scale.