Rhamphocottus nagaakii (Cottoidea: Rhamphocottidae), a new species of grunt sculpin from the Northwestern Pacific, with notes on the phylogeography of the genus Rhamphocottus.
Rhamphocottus nagaakii (Cottoidea: Rhamphocottidae), a new species of grunt sculpin from the Northwestern Pacific, with notes on the phylogeography of the genus Rhamphocottus.
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Rhamphocottus nagaakii（Cottoidea：Rhamphocottidae），来自西北太平洋的杜父鱼新种，附有 Rhamphoccottus 属的系统发育地理学注释。
DOI：
10.1007/s10228-022-00885-y
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Tsuruoka O.
中科院分区：
文献类型：
--
作者：
Munehara H.;Togashi K;Yamada S;Higashimura T;Yamazaki A;Suzuki S;Abe T;Awata S;Koya Y;Tsuruoka O.
根据遗传证据和形态差异，描述了栖息于太平洋西北部的一新种--沙鼠(Rhamphcottus Nagaakiii)，该种以前被鉴定为1874年。根据与头部相关的形态特征可以区分新种，包括头部长度[标准长度(SL)的45.3-54.6%]、尾部头部长度(18.8-25.5%SL)和胸鳍底部长度(15.8-20.7%SL)，它们都小于INR。Richardsonii(分别为53.6%~60.5%、26.2%~31.7%和19.5%~25.2%)。两个物种之间的遗传差异明显超过了种内差异的水平。长颈鼠被认为是这两个物种的共同祖先的后代，这两个物种可能居住在阿留申群岛周围的北太平洋边缘的某个地方。在上新世或中新世的一段冷却时期，R.nagaakiandR.理查德森被分离到太平洋西北部和东北部的南部地区，随后经历了物种形成。
A new species of grunt sculpin,Rhamphocottus nagaakiiinhabiting the northwestern Pacific, previously identified asRhamphocottus richardsoniiGünther 1874, is described based on genetic evidence and morphological differences. The new species can be distinguished based on morphometric characters related to the head, including head length [45.3–54.6% of standard length (SL)], postorbital head length (18.8–25.5% SL) and the length of pectoral-fin base (15.8–20.7% SL), which are smaller than inR. richardsonii(53.6–60.5% SL, 26.2–31.7% SL, and 19.5–25.2% SL, respectively). Genetic differences between two species markedly exceed levels for intra-specific differences.Rhamphocottus nagaakiiis considered to have arisen from a common ancestor of the two species, which probably inhabited somewhere the North Pacific Rim around the Aleutian Archipelago. During a period of cooling in the Pliocene or the Miocene,R. nagaakiiandR. richardsoniibecame separated to the southern regions of the northwestern and northeastern Pacific, and subsequently underwent speciation.