. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 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 Turrid
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 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 three groups of capsules is not unexpected, because capsule size in neogastropods is proportional to adult size. Capsule size is also correlated with female foot width; the capsule is formed and manipulated by the foot during deposition (Robertson, 1976; Shimek, 1986). Berg(1985) estimated that "lens-shaped" oothecae from the Garden of Eden and Mussel Bed hydrothermal vent sites along the Galapagos Rift contained from 500-1000 eggs with a mean size of ± nm by ± nm. This agrees well with our count of 1052 larvae in one capsule from Dive 2031 and with the size of larvae both from this capsule
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
