title: Morphological discrimination of two genetic groups of a Japanese salamander, Hynobius naevius (Amphibia, Caudata).
abstract: Hynobius naevius, distributed on western Honshu, Shikoku, and Kyushu Islands of Japan, includes two genetically distinct groups (Groups A and B) that have never been delimited morphologically. Using specimens from the entire species range, we investigated the possibility of distinguishing these groups morphologically. Multivariate analyses of morphometric characters resulted in recognition of two groups that corresponded well to the two genetic groups. One (Group A) was characterized by larger body, compressed tail, shallower vomerine tooth series, bluish- or reddish-purple ground color, and pale-white lateral markings. In contrast, another (Group B) was characterized by smaller body, cylindrical tail, longer vomerine tooth series, reddish-brown ground color, and white lateral markings. Group A was composed of populations from the Chugoku District of Honshu and northern Kyushu, and could not be divided into subgroups, while Group B encompassed populations from the Chubu and Kinki Districts of Honshu, Shikoku and Kyushu, and was subdivided into three local subgroups that are geographically separated by marine straits. Morphometric differentiation in Group A is presumed to have been less affected by genetic factors than by other factors, such as ecological relationships with other, coexisting species. Differentiation in Group B is assumed to have been enhanced not only by genetic but also by climatological factors.
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tominaga
authors.forename: Masafumi
authors.initials: M
authors.lastname: Matsui
authors.forename: Kanto
authors.initials: K
authors.lastname: Nishikawa
authors.forename: Shingo
authors.initials: S
authors.lastname: Tanabe
authors.forename: Shin'ichi
authors.initials: S
authors.lastname: Sato
mesh_terms: D000818:Animals; D049628:Body Size; D001837:Body Weights and Measures; D003710:Demography; D005260:Female; D005843:Geography; D007564:Japan; D008297:Male; D015999:Multivariate Analysis; D010858:Pigmentation / Q000502:physiology; D012727:Sex Characteristics; D013045:Species Specificity; D013623:Tail / Q000033:anatomy & histology; D014070:Tooth / Q000033:anatomy & histology; D014562:Caudata / Q000033:anatomy & histology* / Q000145:classification*