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本文根据采自海南岛的标本描述了中国南海一新记录种:颈斑尖猪鱼(Leptojulis lambdastigma)。本种的主要形态特征为:体长形,体长为体高的3.7~4.0倍,为头长的3.1~3.6倍;头长为吻长的2.7~3.3倍,为胸鳍长的1.45~1.65倍;头裸露无鳞;两颌前端各具2对大犬齿,外侧1对犬齿弯向外后方;背鳍Ⅸ-12,臀鳍Ⅲ-12,胸鳍i(不分支)+11-12(分支);侧线完整,侧线鳞27;颈部具一个“V”形大黑斑,胸鳍后部的上方、侧线的下方具一小黑斑。新鲜标本头部具2条黄色纵带,沿体侧分别经眼和胸鳍基部向后达尾鳍基部;体侧背部具1条浅棕黄色条带;胸鳍基部棕红色,后部浅色;臀鳍浅蓝色;尾鳍下部淡蓝色,上部橙色。本种与尾斑尖猪鱼(L.urostigma)形态较为相似,主要差别在于颈斑尖猪鱼的颈部具有一显著的“V”形黑斑,尾鳍基部无黑斑(尾斑尖猪鱼具此黑斑)。
This paper describes a new record species of Leptojulis lambdastigma in the South China Sea based on specimens collected from Hainan Island. The main morphological characteristics of this species: body length, body length of 3.7 to 4.0 times the body length of 3.1 to 3.6 times the head length; head length of the kiss length of 2.7 to 3.3 times the long 1.45 to 1.65 times the length of pectorals ; Head naked without scales; the front of two jaws with two pairs of large canine teeth, the outer side of a pair of cynate bends outward; Dorsal fin Ⅸ-12, anal fin III-12, pectoral fin i (no branch) + 11-12 Complete, lateral scales 27; neck with a “V” shaped big dark spots, pectoral fins above the back, with a small dark spot below the lateral line. The fresh specimen has two yellow longitudinal bands at the head and one caudal fin base at the base of the eye and the pectoral fin along the body side, one light brownish yellow band at the dorsal part of the body, the reddish brown at the base of the pectoral fin and the light at the back, Blue; caudal fin light blue, upper orange. The morphology of L.urostigma is similar to that of L.urostigma, with the main difference being that the neck of the necked spotted pig had a prominent “V” shaped black spot with no black spots at the base of the caudal fin Pig fish with this black spot).