Cephalic Lateral-line Systems and Geographical Distribution in the Genus Tribolodon(Cyprinidae)

概要

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Cephalic lateral-line systems are effective diagnostic characters for each species in the genus Tribolodon.When canal pore numbers are considered in relation to the presence or absence of the connection between the preoperculomandibular canal (POM) and the postocular commisure (POC), these are grouped into three patterns, i.e., 1) lower number of pores and absence of the connection between POM and POC, 2) higher number of pores and absence of the connection between POM and POC, and 3) higher number of pores and presence of the connection between POM and POC.Three patterns are also observed concerning differences in the geographical distribution and habitats of the species within its geographical range in Japan, i.e., 1) the entire range of distribution and habitats of Tribolodon, 2) restricted to the northern half of the range, and 3) restricted to a limited area, as in Ukekuchi-ugui. Relationships of each species of Tribolodon and these patterns described above seem to indicate that the species-specificity of each species can be categorized by a certain pattern of coordination to the environmental factors, which themselves are, more or less, shared in common by all species of the genus.
日本魚類学会の論文