FIG. 4 in Spermatozoal morphology in the "symmetrical" hermit crab, Pylocheles (Bathycheles) sp. (Crustacea, Decapoda, Anomura, Paguroidea, Pylochelidae)

FIG. 4. — Transmission electron micrographs of spermatozoa of Pylocheles (Bathycheles) sp.; A, detail of one side of the opercular ring; B, transverse section (ts) through the perforatorial chamber and base of the acrosome vesicle; C, slightly oblique ts through base of the acrosome vesicle and cytoplasm. Abbreviations: cy, cytoplasm; ia1, inner acrosome zone 1; ia2, inner acrosome zone 2; ia3, inner acrosome zone 3; ia4, inner acrosome zone 4; m, mitochondrion; n, nucleus; npm, nuclearplasma membrane; o, operculum; oa, outer acrosome zone; p, perforatorial chamber; pa, peripheral acrosome zone. Scale bars: A, B, 1 µm; C, 2 µm.