Comparative Mitogenomics Reveals Cryptic Species in Sillago ingenuua McKay, 1985 (Perciformes: Sillaginidae).
Comparative Mitogenomics Reveals Cryptic Species in Sillago ingenuua McKay, 1985 (Perciformes: Sillaginidae).
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仅凭外部形态特征识别海水鱼类是不可靠的。物种错误识别给渔业研究、资源监测和经济管理带来了巨大的挑战。银鱼是经济海水鱼的重要组成部分，其中，不同类群之间的形态差异不明显。在此，我们比较了采自厦门、东山、基隆、宋卡和爪哇的银杏不同地理类群。结果表明，所有样本在外部形态特征和鱼囊形状上都是相似的，但有两个不同的谱系，基于DNA条码被标记为隐蔽物种。比较有丝分裂组学结果表明，银杏叶甲和银杏叶甲在结构组织和基因安排上是相同的。它们的核苷酸组成和密码子使用也是相似的。对8个种的13个连结的PCG进行了系统发育分析。结果表明，南方红豆杉A和南方红豆杉B之间的遗传距离较大(D=0.069)，这一遗传距离足以说明它们可能是不同的物种。
It is unreliable to identify marine fishes only by external morphological features. Species misidentification brings great challenges to fishery research, resource monitoring and ecomanagement. Sillago ingenuua is an important part of commercial marine fishes, and in which, the morphological differences between different groups are not obvious. Here, we compared different geographical groups of S. ingenuua which were collected from Xiamen, Dongshan, Keelung, Songkhla and Java. The results showed that all samples of S. ingenuua were similar in external morphological characteristics and the shape of the swim bladder, but there were two distinctive lineages which were flagged as cryptic species based on DNA barcoding. The comparative mitogenomic results showed that S. ingenuua A and S. ingenuua B were identical in structural organization and gene arrangement. Their nucleotide composition and codon usage were also similar. A phylogenetic analysis was performed based on 13 concatenated PCGs from eight Sillago species. The results showed that the genetic distance between S. ingenuua A and S. ingenuua B was large (D = 0.069), and this genetic distance was large enough to reveal that S. ingenuua A and S. ingenuua B might be different species.
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