- 著者
-
Kakui Keiichi
Hiruta Chizue
Uyeno Daisuke
- 出版者
- Wiley
- 雑誌
- Invertebrate Biology (ISSN:10778306)
- 巻号頁・発行日
- vol.138, no.3, pp.e12257, 2019-09
- 被引用文献数
-
3
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.