<国立科博専報>伊豆半島産ヒミズ個体群の分析

概要

論文の詳細を見る
Interrelationships of eight demes of Urotrichus hondonis consisting of 110 specimens from the Izu Peninsula were studied taxononomically (Table 1). A smaller, a larger, and an intermediate forms were recognized among them. The smaller form, the Amagi group, with a relatively long tail, distinctly smaller body, and slightly shorter mandible, is confined to a mountainous region in the northern part of Mt. Amagi. On the other hand, the larger form, the Omuro-Shimoda group, with shorter tail, relatively large body, and slightly longer mandible, is found mainly in lowlands extending from the northeastern part through the southeastern district to the southwestern part of the Izu Peninsula. The phenetic differences between these two groups are very clear, because the mean values with twice the standard error in the length of body and mandible of II, III, and IV of the Amagi group are much smaller than the range of Yc±2Sys of the Omuro-Shimoda group, as shown in Figs. 4 and 5. Although there is an intermediate form containing demes V and VI, the Amagi and the Omuro-Shimoda groups are considered to be different taxa which differ in the time of distributional expansion following their emergence. Among them, the Amagi group may be an earlier and more primitive form than the Omuro-Shimoda group and may have been dispersed from the lowlands of the Izu Peninsula by the latter.
国立科学博物館の論文
1982-12-01