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| Ainsworth's salamander ： ウィキペディア英語版 |
Ainsworth's salamander
The Ainsworth's salamander (''Plethodon ainsworthi'') is an extinct species of salamander in the family Plethodontidae. It was endemic to the United States and only known from its type series collected in Jasper County, Mississippi.〔
==Description==
Ainsworth's salamander is a very attenuated ''Plethodon'' with short limbs. It has 16 costal grooves, counting a Y-shaped groove in the groin as two grooves, and 4–6 costal folds between adpressed limbs. Peritoneum is not distinctively pigmented. There are 40 premaxillary/maxillary teeth, and palatine teeth in large median patch, 12 teeth wide and 18 teeth long. Vomerine teeth are in two well-separated arc-shaped rows, with 8–10 teeth each. As with all ''Plethodon'', this species has four digits on the manus and five on the pes, a cylindrical tail without any basal constriction, and a tongue attached in the front.〔 (Lazell (1998) )〕
In preservative, the specimens are dark blackish-brown without any noticeable pattern, and the peritoneum lacks any distinctive pigmentation.〔
The holotype and paratype were collected by Jackson Harold Ainsworth as ''Plethodon glutinosus'' in 1964,〔 and described as a new species, ''Plethodon ainsworthi'', by Lazell in 1998.〔 No other specimens are known.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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