PSEUDOXENODON STEJNEGERI

(Stejneger's) Mountain Keelback

史丹吉氏斜鱗蛇

保育等級: 非保育類

無毒

 

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家族

黃頜蛇科,Natricinae 亞科;

Colubridae, subfamily Natricinae

 

最大長度 90 cm

 

台灣棲地分布

分布台灣全島1000-2500公尺之間。少見。

 

世界棲地分布

台灣特有亞種。

 

外觀描述

Small snake; total length up to 90 cm. There are 15-21 (17 at mid-body) rows of keeled scales; anteriorly dorso-lateral scales are oblique. Head is oval, triangular and distinct from neck; body is slightly stout; tail is long. Eye is medium to large size; iris is light flesh-colored with flecks of black, and darkened in lower two-thirds; pupil is round, black, surrounded by narrow ring of light flesh. Tongue is maroon, fork tips may be gray. It has enlarged rear fangs. The color of upper surface is extensively varied among individuals, including grey, green, yellow, orange, brown, and purple. A dark stripe extends from eye to base of jaw, and usually a reddish or black chevron sits on the nape, with its apex pointing toward the head. There are light bands along the vertebral ridge and dark squares on the sides of the bands; a light mid-dorsal stripe runs along the tail. Ventral surface is whitish anteriorly, gradually tinted with pinkish and may be mottled with black or white pigment in following part of body; the black spots aggregating on sides of the ventrals usually form a longitudinal stripe. The ventrals in anterior body may also have scattered quadrangular marks of black pigment which are irregularly arranged on sides. Anal scale is divided and subcaudals are paired.

 

生態描述

白天與夜晚皆會出沒,此種後溝牙蛇類(rear-fanged=opistoglyphous,請見附註(1)) 喜歡棲息在山林潮濕的地區,尤其是靠近河流或小溪的地方,因為牠們喜歡補食蛙類和山椒魚。此種蛇類為卵生,但只有很少一部分的人了解牠們的繁殖過程。當牠遇敵時,會舉起頭部與頸部,並且膨脹頸部達到威嚇效果。有點類似眼鏡蛇,可是沒有眼鏡蛇膨脹的那麼大。

Th此種蛇類體背底色個體間差異性很大,除了一般常見的褐色和灰褐色之外,還有偏紅、偏黃、偏灰、偏綠、偏橘與偏紫等等。

 

學名與俗名

Pseudoxenodon : 希臘文; pseudo 的意思是"偽裝" ; xenodon (意指 "異齒蛇屬") 是一種產自中南美洲的蛇。

stejnegeri: 來自 Leonhard Hess Stejneger, (1851-1943), 他是一位出生在挪威的爬蟲學家,後來在1881年移居到美國,1889年在史密森學會(Smithsonian Institution)擔任爬蟲館館長。

史丹吉氏斜鱗蛇、花尾斜鱗蛇(中國大陸)、紋尾斜鱗蛇

 

附註

(1) "Opisthoglyphous snakes(後溝牙蛇 - opistho為後面之意,glyphos則為溝槽) ,有微毒,牠是利用上顎的後方一對擴大的牙齒來注入毒液。 這種毒牙在蛇閉合嘴吧時並不會垂直下降刺穿蛇的嘴,而是有隨著蛇的嘴開合而往後方斜向升降,蛇的嘴中有一對溝槽可以在閉合時收納這對毒牙。一般俗稱"rear-fanged snakes"。 (Source)

 

相關連結

Reptile Database

翻譯:周信甫

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