. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDROTHERMAL VENT EGG CAPSULES 45. Figure 23. (A) View of the convex side of Juan de Fuca Ridge egg capsule. Scale bar = 1 mm. bm. basal membrane. (B) Lateral view of Juan de Fuca capsule showing lateral ridge running into two apical wing- 1974; Robertson. 1976; Bandel, 1974b, 1975b, 1982; So- liman, 1987; M. F. Strathmann, 1987). Based on egg cap- sule morphology, we cannot assign the inflated triangular egg capsules from the Galapagos Rift to a particular spe- cies. A more definitive statement on the taxonomic affil- iatio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDROTHERMAL VENT EGG CAPSULES 45. Figure 23. (A) View of the convex side of Juan de Fuca Ridge egg capsule. Scale bar = 1 mm. bm. basal membrane. (B) Lateral view of Juan de Fuca capsule showing lateral ridge running into two apical wing- 1974; Robertson. 1976; Bandel, 1974b, 1975b, 1982; So- liman, 1987; M. F. Strathmann, 1987). Based on egg cap- sule morphology, we cannot assign the inflated triangular egg capsules from the Galapagos Rift to a particular spe- cies. A more definitive statement on the taxonomic affil- iation of the inflated triangular capsule must await ad- ditional collections of organisms from the Galapagos Rift vent fields and further taxonomic examination of existing material. The wall structure of the inflated triangular egg capsules from the Galapagos Rift is similar to that seen in several species within the Muricoidea (Roller and Stickle, 1988; D'Asaro, 1988). although too little is known of egg capsule wall structures at this time to make a definitive statement as to this capsule's affinity. Because all three inflated tri- angular capsules collected from Galapagos Rift on three separate dives in 1985 contained early veligers at the same stage of development, it is possible that some degree of reproductive synchrony occurs in this population. Juan dc Fuca Ridge egg capsules Egg capsules strikingly similar in size and shape to the Juan de Fuca Ridge capsules described in the present study are produced by the cancellariid neogastropod, Admele viridula (Fabricius) [Thorson, 1935: fig. 71 (mistakenly attributed to I 'eliitina undala Brown, see Thorson, 1944: 108); Bouchet and Waren, 1985b: fig. 687]. The capsules described herein and those of A. virudula both possess parallel wing-like extensions, a flattened base, and an api- cal escape aperture. Species ofAdmete have been described from 6700 m deep in the Kermadec Trench, whereas A. viridula, which is circumpolar, has a dep
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
