. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 15. Light micrograph of convex side of Galapagos Rift inflated triangular egg capsule with embryos visible through the transparent cap- sule wall. Arrows mark the lateral ridges. Scale bar = 1 mm. bm. basal membrane. oothecae in different gastropod taxa is characteristic of the species, and in some cases, of higher orders of clas- sification, and may be valuable in taxonomy. It should be noted, however, that similar capsules may be produced by taxonomically diverse species, while in other cases in- terspecific variati
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 15. Light micrograph of convex side of Galapagos Rift inflated triangular egg capsule with embryos visible through the transparent cap- sule wall. Arrows mark the lateral ridges. Scale bar = 1 mm. bm. basal membrane. oothecae in different gastropod taxa is characteristic of the species, and in some cases, of higher orders of clas- sification, and may be valuable in taxonomy. It should be noted, however, that similar capsules may be produced by taxonomically diverse species, while in other cases in- terspecific variation in capsule morphology is insufficient to differentiate closely related species (Kohn. 1961).. Figure 16. (A) View of the convex side of Galapagos Rift inflated triangular egg capsule with individual embryos visible through transparent membrane. Arrows mark the lateral ridges. Scale bar = 1 mm. (B) Apical view of Galapagos Rift inflated triangular egg capsule. Arrows mark the lateral ridges. Scale bar = 1 mm. bm. basal membrane. Galapagos Rift lenticular egg capsules Flattened lenticular egg capsules with a centrally located escape aperture are known from the neogastropod families Muricidae, Fasciolariidae, and Turridae. Dimensions and other statistics pertaining to selected lenticular egg capsules from these families are presented in Table III. The only member of these families known to occur at the Galapagos Rift hydrothermal vents is a large turrid, provisionally described as Phymorhynchus sp. (Waren and Bouchet, 1989). A similar species occurs at 13°N and 21 °N on the East Pacific Rise (Turner el a!., 1985; Waren and Bouchet, 1989). Both the six egg capsules described by Turner el al. (1985) and the five "lens-shaped" egg cases described by Berg (1985) as characteristic of turrids, as well as, the lenticular egg capsules described in this paper, may all belong to Phymorhynchus sp. from the Galapagos Rift. Differences in reported average size between these thre
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
