Archive image from page 9 of Current herpetology (2000). Current herpetology currenthe222420032004niho Year: 2000 ( Fig. 4. Two dimensional plots of the first (CANl) versus second (CAN2) canonical variables (upper) and the first versus third (CANS) canonical variables (lower). Closed squares, open circles, open squares, open triangles, and reversed open triangles represent scores for specimens of Hyno- bius sp. on Kamishima Island, H. boulengeri from Sobo-Katamuki Mountains, Osumi Peninsula, H. stejnegeri, and H. naevius, respectively. Discussion Natural history The habitat and external morph
Archive image from page 9 of Current herpetology (2000). Current herpetology currenthe222420032004niho Year: 2000 ( Fig. 4. Two dimensional plots of the first (CANl) versus second (CAN2) canonical variables (upper) and the first versus third (CANS) canonical variables (lower). Closed squares, open circles, open squares, open triangles, and reversed open triangles represent scores for specimens of Hyno- bius sp. on Kamishima Island, H. boulengeri from Sobo-Katamuki Mountains, Osumi Peninsula, H. stejnegeri, and H. naevius, respectively. Discussion Natural history The habitat and external morphology of larvae and adults of the salamander from Kamishima of the Amakusa Islands indicate that this is a lotic breeder (H. naevius group of Sato [1943]). The Kamishima salamander seems to breed before May and then stay near the breed- ing stream. The most important aspects of its natural history such as breeding season, oviposi- tion site characteristics, clutch size, egg diameter, egg sac shape, hatching time, and size of larvae at hatching are totally unknown. Some larvae seem to start metamorphosis before mid October, and the average size at metamorphosis is estimated as approximately 26 mm in SVL. However, some other larvae may overwinter and metamorphose at a larger size in the following spring or summer, as is usual with other lotic breeding Hynobius species (Misawa and Matsui, 1997). Estimated size at metamorphosis (ca. 26 mm) is smaller than that of H. boulengeri from the Sobo- Katamuki Mountains and H. stejnegeri (ca. 35-50 mm in SVL: Sato, 1954; Nishikawa et al., unpubhshed), but is similar to that of H. boulengeri from the Osumi Peninsula (ca. 25- 35 mm: Sato, 2003; Nishikawa et al., unpub- lished). In H. boulengeri, geographically vari- able size at metamorphosis is thought to induce great variation in adult SVL (Nishikawa et al, 2001). The two juveniles collected in May were slightly larger than older larvae collected in October, and thus seem to have metamor- ph
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