A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae.
A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae.
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DOI：
10.3897/zookeys.1038.63170
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发表时间：
2021
期刊：
影响因子：
1.3
通讯作者：
Ohtsuka S
中科院分区：
文献类型：
--
作者：
Komeda S;Adachi K;Ohtsuka S
描述了大陆架超底栖生物属Pilarella的一新种，首次发现于印度-太平洋。这是已知的第二种Pilarella，也是该属中第一个描述雄性的种。根据(1)短尾分枝，长于宽约1.5倍；(2)在下颌内足足上有2根刚毛；(3)在上颌骨上足上有6根刚毛；(4)在雌性上，有一短的左侧触角，到达生殖器双体节的后缘。Pilarella的新诊断与Metacalanus的不同之处在于触角的祖先节段IX-XII和XIV-XV的分离，以及在上颌前根节骨上存在5-6个刚毛。在触角外足目的第三个祖先节段上没有刚毛，腿1-3对称，雌性腿5上有内侧的基生刚毛，雌性腿5上有2个外侧的节外刺，将Pilarella从Metacalalinis中分离出来。对Arietellidae的一些代表性属的分子系统发育分析，包括本新种，恢复了与以前研究相同的两个arietellids支系(Metacalanus和Arietellus)。文中还收录了该科各属的二分检索表和水母属的两分检索表。
A new species of the continental shelf hyperbenthic genus Pilarella is described, the first from the Indo-Pacific. This is the second species of Pilarella known, and the first description of a male in the genus. The new species is easily distinguished from other species of Pilarella (P. longicornis) based on: (1) short caudal rami, approximately 1.5 times longer than wide; (2) 2 setae on the mandibular endopod; (3) 6 setae on the maxillular coxal epipodite; and (4) in the female, a short left antennule reaching the posterior border of the genital double-somite. The new diagnosis of Pilarella differs from Metacalanus in the separation of ancestral segments IX–XII and XIV–XV of the antennule, and the presence of 5–6 setae on the maxillular praecoxal arthrite. Pilarella is also separated from Metacalanalis based on the absence of a seta on the third ancestral segment of the antennary exopod, the symmetry of legs 1–3, the presence of a medial basal seta on the female leg 5, and 2 lateral exopodal spines on the female leg 5. A molecular phylogenetic analysis of some representative genera of the family Arietellidae, including the present new species, recovers two arietellid clades (Metacalanus- and Arietellus-clades) as in previous studies. Dichotomous keys for the genera of Arietellidae and the species of Pilarella are included.
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影响因子：
0.6
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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通讯作者：
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影响因子：
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通讯作者：
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