FIGURE 3 in A new species of the genus Peltogaster Rathke, 1842 (Cirripedia: Rhizocephala: Peltogastridae) parasitizing the hermit crab Pagurixus boninensis (Melin, 1939) from the Bonin Islands, Japan

FIGURE 3. Histological section of Peltogaster unigibba n. sp. (RUMF-ZC-3067). a) Transverse section. b–f) Cross-section. a) Mantle aperture (the asterisk indicates the mantle aperture and white arrow indicates the 2-cell stage of embryo); b) externa at colleteric glands; c) colleteric glands and ganglion; d) externa at stalk level; e) left receptacle duct; f) opening receptacle duct. Black arrows indicate the dorsal direction. Abbreviations: EM, embryo; GA, ganglion; LCG, left colleteric gland; LDO, left opening receptacle duct; LL, left lobe; LRD, left receptacle duct; LRE, left receptacle; M, mantle; MC, mantle cavity; MW, mantle aperture wall; OV, ovary; RCG, right colleteric gland; RDO, right opening receptacle duct; RRD, right receptacle duct; RRE, right receptacle; SH, shield; ST, stalk. Scale bars: a, b, d, and f = 100 µm; c and e = 50 µm.