摘要
对一个物种变异特征的研究在种及种下分类工作中有着重要的意义。本文以中国科学院成都生物研究所(C IB)两栖爬行动物标本馆馆藏铜蜓蜥(Sphenom orphus indicus)标本430号为对象,对其鳞片数目及排列的变异做了统计分析。鳞被特征是有鳞目蜥蜴亚目物种重要的鉴别特征,本文主要研究了铜蜓蜥吻鳞、上鼻鳞、额鼻鳞、额鳞、前额鳞、眶上鳞、额顶鳞、顶间鳞、顶鳞、颈鳞、鼻鳞、颊鳞、颞鳞、上唇鳞、下唇鳞、颏鳞、后颏鳞、颔片、背中线鳞、腹中线鳞、环体一周鳞的特征及其变异情况,并运用M icrosoft O ffice Excel 2003计算鳞片的变异频率、变异范围、平均鳞片数目。根据鳞片变异频率的不同可将其分为三类:数量恒定无变异的鳞片、可出现变异的鳞片、绝对有变异的鳞片。发现:①过去文献对于颈鳞有无的判断存在不足;②西藏墨脱地区标本头部眶上鳞、额顶鳞、顶间鳞数目和排列方式的特殊变异现象。研究结果为今后铜蜓蜥的鉴别提出了更准确的标准,并建议今后应对铜蜓蜥西藏墨脱居群进行更深入的研究,以解释其头部鳞片特殊变异的成因。
Lepidosis is a significant characteristic for lizards＇ identification. Researching lepidosis variation based on a large number of specimens can get more exact data for taxa at species level and intraspecies level. Moreover,these data may help to reveal some phylogenetic and biogeographic problems. Sphenomorphus indicus is a widespread species in China. This research used Code No. 430 specimens of Sphenomorphus indicus, in Chengdu Institute of Biology （CIB） museum collections. The research focused on the number of head scales （ rostral, supranasal, frontonasal, prefrontal, frontal, interparietal, frontoparietal, parietal, supraocular, nuchal, nasal, loreal, temporal, supralabial, mental, postmental, infralabial chin-shield ） , mid-dorsal scales, mid-ventral scales, scales around mid-body and used Microsoft Office Excel 2003 to deal with the data. According to the variation frequency, the scales could be divided into three types： 1. no variation; 2. occasional variation ;3. constantly variation and the variation ranges of different scales were recorded as well. The previous literature recorded S. indicus as absent nuthai. However, our result showed that the number of nuchal in S. indicus should be absent or one pair. The S. indicus population from Medog （ a county of Xizang AR） had different scale numbers and particular arranging patterns in supraoculars, frontoparietals,interparietcl. How to explain this phenomenon in Medog population needs more work in the future.
出处
《四川动物》
CSCD
北大核心
2007年第2期392-394,I0008,共4页
Sichuan Journal of Zoology
关键词
鳞被特征
变异
铜蜓蜥
lepidosis
variation
Sphenomorphus indicus
