Journal
ZOOLOGICAL SCIENCE
Volume 29, Issue 5, Pages 305-310Publisher
ZOOLOGICAL SOC JAPAN
DOI: 10.2108/zsj.29.305
Keywords
Glandiceps; enteropneust; hemichordate; acorn worm; Seto Inland Sea of Japan; burrow; breeding; swimming
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The enteropneust hemichordate Glandiceps hacksi inhabits the muddy bottoms of the intertidal to subtidal zones of Koguno-shima Island, located in the central part of the Seto Inland Sea of Japan. Monthly collections from October 2005 to September 2007 revealed that their spawning occurs once a year, in the latter half of May. Parameters such as density and sex ratio, as well as the type of sediment, were also examined. Worm behavior and type of burrows revealed that G. hacksi are infaunal burrowers. Autotomy and regeneration of their posterior regions, and swimming behavior were also observed in an aquarium environment. This is the first comprehensive study on the biology of G. hacksi, the swimming acorn worm.
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