File:American malacological bulletin (1986) (18152778222).jpg

Title: American malacological bulletin
Identifier: americanmal4519861987amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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D'ASARO: EGG CAPSULES OF SMALL MARINE PROSOBRANCHS 189 an obvious spot or ring. In T. bella, polar pigment was dif- fuse. Later in development, polar pigment became associated with velar cells. Egg color probably reflected diet (see Robert- son, 1985), because T. a. affinis from patch-reef habitats with dense populations of rhodophytes, especially encrusting cor- alline species, produced purplish-pink ova. Development of the three species studied progressed rapidly, with veligers escaping from the vitelline capsule after approximately 24 hours. Veligers all retained considerable yolk after swim- ming for hours (the point at which observations ceased). As Robertson (1985) suggested, these larvae may be lecithotrophic, but further observations are necessary to con- firm whether or not feeding occurs. Puperita pupa (Linne\ 1767) (USNM 836975) Egg capsules and spawning adults were collected from yellow zone splash pools isolated from the ocean on Round
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Rock and North Turtle Rock, Bimini, Bahamas, between February 26 and March 6, 1985. In the pools, adults ag- gregated under ledges or on and under loose rocks (oolitic limestone, and Millepora spp. and madreporarian skeletons) and deposited almost microscopic egg capsules in those loca- tions. Typically, capsules were hidden in holes or depressions at least deep enough for the surface of the capsule to be level with or lower than the surface of the substratum. A sample of 50 spawning sites from several rocks in one pool included only one capsule fully exposed on a flat surface. In madreporarian calyxes, a frequently selected site, two or three capsules were usually clustered together. No capsules were found on smooth or eroded conspecific shells, a common spawning site for other neritids. Selection of depressions for oviposition by other neritid species was reported by Andrews (1935). A tabulation of published data on neritid egg capsules was presented by Govindan and Natarajan (1974). Adults spawned in the laboratory after less than

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