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Sexual system in the tanaidacean Falsapseudes bowmani(Crustacea: Malacostraca: Peracarida)

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Title: Sexual system in the tanaidacean Falsapseudes bowmani(Crustacea: Malacostraca: Peracarida)
Authors: Kakui, Keiichi Browse this author →KAKEN DB
Hiruta, Chizue Browse this author →KAKEN DB
Uyeno, Daisuke Browse this author
Keywords: anatomy
sexual dimorphism
simultaneous hermaphroditism
Issue Date: Sep-2019
Publisher: Wiley
Journal Title: Invertebrate Biology
Volume: 138
Issue: 3
Start Page: e12257
Publisher DOI: 10.1111/ivb.12257
Abstract: With more than 40,000 species, Malacostraca is the most diverse crustacean class. Most malacostracans are gonochoristic, but simultaneous hermaphrodites are also known. Tanaidacea is one of two malacostracan orders that includes simultaneously hermaphroditic species; so far, simultaneous hermaphroditism has been confirmed externally and internally in only two tanaidacean species, both in the genus Apseudes (Apseudidae). Here we show, through external and internal morphological observations of fixed specimens, that the apseudid Falsapseudes bowmani is a simultaneous hermaphrodite, making Falsapseudes the second tanaidacean genus in which simultaneous hermaphroditism has been confirmed both externally and internally. In this species, the epistome (a projection on the clypeus) was thick and elongate in large specimens but was thin and spiniform in smaller specimens; the brooding of eggs or embryos was observed only in thin-epistome individuals, although a pair of ovaries was confirmed in both thick- and thin-epistome individuals. This suggests that individuals with a thick epistome may act as males while also retaining the female reproductive organs.
Rights: This is the accepted version of the following article: Keiichi Kakui, Chizue Hiruta and Daisuke Uyeno. Sexual system in the tanaidacean Falsapseudes bowmani (Crustacea: Malacostraca: Peracarida). Invertebrate Biology 138(3) 2019, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角井 敬知

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