Oct-GnRH has also been characterized from thecentral nervous systemsof thecommon cuttlefishSepia officinalisand the swordchip squidUroteuthis edulis(Table 57B.1).2Other molluscan GnRH-related peptides, such as ap-GnRH, cg-GnRH, lg-GnRH, and my-invGnRH, have been reported (Table 57B.2).3,...
Spermatozoa of Sepia officinalis The cephalopod spermatozoon is comparatively large and almost closely similar to those of vertebrates. A great variety of cephalopod spermatozoa were extensively described by Fretter and Graham (1964). Franzén (1955, 1956, 1967) concluded that the morphology of the sp...
gigas), the common cuttlefish (S. officinalis) and the pharaoh cuttlefish (S. pharaonic) can reach body sizes of respectively 1.2 m, 0.49 m and 0.42 m mantle length (Nigmatullin et al., 2001; Reid et al., 2005), most cephalopod species are small/moderately sized (mantle length 8–600...