Reexamination on the taxonomic position of two intraspecific taxa in Japanese Eothenomys: evidence from crossbreeding experiments (Mammalia: Rodentia) : Taxonomy and Systematics

概要

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As a part of the study in which the taxonomic validity of E, kageus is inclusively reexamined, crossbreeding experiments were made between Eothenomys smithii with six mammae and E. kageus with four mammae, which have been separated by the difference mainly in number of the mammae and in shape of the baculum. Consequently, these two species readily interbred in crosses of both E. smithii♀ x E. kageus ♂ and E. kageus ♀ X E. smithii ♂. F1 hybrids obtained from the two crosses possessed normal breeding ability. Moreover, F5 hybrids were produced from the line of the former cross. Some daughters were different from their mothers in number of the mammae, and some litters included both females with four mammae and females with six mammae within a litter. These facts suggest that both species may share an intercommunicating gene pool with each other, and mean that the difference in number of the mammae is an intraspecific variation or a polymorphism. It has been also said that the shape of the bacula is a poor taxonomic character. Therefore, taking the reproductive compatibility between them and the unreliability of the taxonomic characters into account, together with the almost entire identity in their karyotypes previously reported by us, it is concluded that E. kogeus is synonymous with E, smithii.
社団法人日本動物学会の論文
1990-02-15