オニノツノガイ上科及びその近縁上科(中腹足目)における嗅検器の型, 生息地及び食性の関連について

概要

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In prosobranchs the type and function of osphradium seem to be related to the habitat and food habit. This study examined the types of osphradia, habitat, food habits of the Cerithiacea and its closely related superfamilies. 1) The Cerithiacea and Strombacea have osphradia of Type I and Type I′, respectively. This difference seems to reflect the habitat difference, i.e., the former lives in muddy bottom and the latter in sandy bottom. The difference of them probably depends on efficiency of olfaction. 2) The difference of osphradia between Type I′and Types II to V perhaps depends on that of food habit. Type I′is found in detritus feeders or herbivores and Types II to V are restricted in carnivores. 3) In the Cerithiacea, three major evolutionary trends are recognized in respect to the types of osphradia. (i) The axis of osphradium becomes longer but leaflets not complicated (Vermetidae to Strombacea). (ii) The axis becomes shorter. The leaflets are either simple or complicated (Potamididae to Cerithiidae, probably to Tonnacea). (iii) The osphradium becomes ciliated functioning for filtering particles such as plankton or detritus (Vermetidae to Calyptraeacea). 4) The osphradium of the Naticidae is bipectinated and belongs to Type II. The axis is shorter than that of Type I, but longer than that of Type V. The structure of leaflets is complicated, but different from that of Type V.
日本貝類学会の論文
1986-03-31