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作者Huang, H.-D.
出版日期2010
著作名稱A field observation on group reproduction in Gymnodoris ceylonica (Kelaart, 1858) (Gastropoda : Nudibranchia), at Lanyu (Orchid Is.), Taiwan.
23: 37-41
摘要Widely distributed in the Indo-Pacific area, the translucent white Gymnodoris ceylonica is moderately common and usually found in seagrass or algal zones preying on other opisthobranchs (Debelius and Kuiter, 2007; Gosliner et al., 2008). Incidentally encountered in mid-July 2009, groups of breeding G. ceylonica were observed at Lanyu (Orchid Is.), off the southeastern coast of Taiwan. At least 32 individuals occurred on a 20 × 20-m2 reef flat with a sandy bottom at 4~8 m deep. Body (head-tofoot) lengths of G. ceylonica individuals ranged 50~80 mm. Over 70% of the G. ceylonica at the site were ovigerous, judged by the yellow eggs visible through their translucent body wall. During the observation of approximately 60 min, about 60% individuals mated or laid eggs. Distances between mating pairs or spawning individuals ranged 30 cm to 3 m. Mating pairs copulated with everted sex organs at the right side of the body for reciprocal fertilization. Gymnodoris ceylonica deposited light-yellowish messy egg string masses instead of the spiral bands like most other dorid nudibranchs do. At the site, no G. ceylonica was foraging; some individuals were found to be unresponsive or dead with no eggs in the body. No animal in the area fed on eggs of G. ceylonica, while some eggs may have been captured by filter feeders on the sea bottom.
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系統號NO000004193

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