ABSTRACT

We describe Zeuxo ezoensis sp. nov. from Hokkaido, Japan. This species closely resembles Z. phytalensis, Z. shitipingensis and Z. turkensis in having the pleopodal endopod with one inner plumose seta, maxillipedal palp article 4 with one outer simple seta, the left mandible with a wide, denticulate lacinia mobilis and one bifurcate accessory seta, and the right mandible with a peg-like lacinia mobilis and two accessory setae. It differs from them in having (1) antennal article 6 longer than wide, (2) the distal region of the maxillipedal endite with four spiniform setae and two circumplumose setae, (3) maxillipedal palp article 2 with one outer simple seta, (4) the chelipedal carpus with three or four dorsodistal simple setae, (5) the chelipedal dactylus with one inner simple seta, (6) the pereopod-1 basis with one or two ventrodistal simple setae, (7) the pereopod-1 carpus with one ventrodistal simple seta, and (8) the uropod with four or five articles (basal article plus three or four ramus articles). Partial nucleotide sequences for the cytochrome c oxidase subunit I (COI) gene (655 nt) from Z. ezoensis specimens from four localities in Hokkaido showed Kimura 2-parameter (K2P) divergences of 0–0.5% and 0.6–1.5% within and between populations, respectively. Based on the COI data, we examined the phylogenetic position of Z. ezoensis within Zeuxo. Six specimens used for morphological observations and 10 specimens used for COI sequencing showed a similar dorsal pigmentation pattern on carapace. We briefly discuss the validity of using this pattern as a diagnostic character in Zeuxo taxonomy.

http://zoobank.org/urn:lsid:zoobank.org:pub:6CB565DB-DAFF-41EF-A06D-EAAE2F619C31

摘要

我们描述Zeuxo ezoensis sp。十一月 来自日本北海道。该物种与Z. phytalensis，Z。shitipingensis和Z. turkensis非常相似。腹足内足有一个内羽状刚毛的刚毛，上颌足底article骨制品4，有一个外部简单刚毛的刚毛，左下颌骨具宽阔的具齿状的乳头状运动菌和一个分叉的附属刚毛，而右下颌骨有一个钉状的运动性紫杉。附件刚毛。它与它们的不同之处在于：（1）触角物品6长于宽度;（2）带有四个刺状刚毛和两个状刚毛的上颌足白蚁的远端区域;（3）带有一个外部简单刚毛的set足触诊物品2（4 ）具三个或四个背足简单刚毛的唇足动物腕骨，（5）具一个内部简单刚毛的唇足动物趾甲，（6）具一或两个腹侧单纯性刚毛动物的脚趾甲基，（7）具一个腹足的简单刚毛动物的脚骨甲1。腹侧单纯性Seta，（8）带有4或5条的底足（基本的条加上3或4条ramus的条）。细胞色素的部分核苷酸序列来自北海道四个地方的e。Z. ezoensis标本的c氧化酶亚基I（COI）基因（655 nt）在种群内部和种群之间的木村2参数（K2P）差异分别为0-0.5％和0.6-1.5％。基于该数据COI，我们研究的系统发育位置Z. ezoensis内Zeuxo。用于形态学观察的六个标本和用于COI测序的10个标本在甲壳上显示出相似的背侧色素沉着模式。我们简要讨论了在Zeuxo分类法中使用此模式作为诊断特征的有效性。

http://zoobank.org/urn:lsid:zoobank.org:pub:6CB565DB-DAFF-41EF-A06D-EAAE2F619C31