青灰海蛇Hydrophis caerulescens
形态特征：头较小，体前段不细长，尾侧扁。鼻孔背位，有瓣膜。体全长600～1000mm。头背暗灰色，幼体头背呈黑色。体尾背面青灰色，具40～60个黑色宽横斑。随年龄增长，横斑逐渐模糊不显，背面呈一致的青灰色。上唇鳞7或8枚，呈2-2-3式，下唇鳞前4枚与颔片相接，颔片2对。颈部一周体鳞36～41枚，躯体最粗部一周44～49枚，起棱强，腹鳞266～292枚，其宽度不到相邻体鳞的2倍。
生活习性：生活于海水中，以鱼类为食，卵胎生，每产2～6条。
地理分布：国内见于山东沿海、广东沿海和台湾沿海及附近海域；国外分布于从印度洋经南中国海至印度尼西亚到澳大利亚北部沿海。
环渤海地区分布：仅见于山东沿海（青岛）。
生存现状：近危（NT）。
62.Hydrophis caerulescens
Description Adults up to 600-1,500mm TL, head is relatively smaller; front body is not slender and long; tail side is flat; nostrils on the back, with valve.Head dorsum is dark greyish; juvenile's head dorsum is black; body and tail dorsum is green and greyish, with 40-60 black wide bands, bands not obvious with ages; dorsum is green and grey.7-8 supralabials are arranged in 2-2-3 rows, 4 infralabials are connected with jaw pieces, 2 pairs of sublinguals.36-41 scales on the neck; 44-49 scales on the broadest body; scales are ribbed; 266-292 ventral scales, not wider than two times of other body scales.
Behaviour Hydrophis caerulescens live in the sea and feed on fish.This species is ovoviviparous.They produce 2-6 eggs at a time.
Distribution Known in the coasts of Shandong Province, Guangdong Province and Taiwan China; in the coasts from Indian Ocean through the sea of South China to Indonesia and coasts of North Australia at abroad.Distribution around Bohai Sea: only in the coasts of Shandong Province ( Qingdao).
Conservation Near Threatened (NT).