Reappraisal of Eiconaxius farreae Ortmann, 1891 and Eiconaxius mortenseni Sakai, 1992 (Decapoda: Axiidea: Axiidae), with description of a new species from Japan.
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Abstract
The sponge associated axiid shrimp Eiconaxius farreae Ortmann, 1891 was originally described based on specimens from Sagami Bay, central Japan. Morphological examination of many specimens of Eiconaxius collected from Sagami Bay and nearby areas, and genetic data from the mitochondrial COI and 16S rRNA genes have revealed that three species are represented. This finding led to a reappraisal of the identity of E. farreae and E. mortenseni Sakai, 1992, also originally described from Sagami Bay. It has been clarified that two species (E. farreae and an undescribed species) were mixed in the syntype material of E. farreae, and consequently, a lectotype of E. farreae is designated in the interest of nomenclatural stability. Here, E. farreae and E. mortenseni are redescribed, and the third species is described as new, E. reconditus. The new species is morphologically very similar to E. mortenseni. Differentiating characters among closely allied species are reassessed. Previous records of E. farreae are reviewed in light of the present findings.
Reappraisal of Eiconaxius farreae Ortmann, 1891 and Eiconaxius mortenseni Sakai, 1992 (Decapoda: Axiidea: Axiidae), with description of a new species from Japan.
与海绵相关的溪虾 Eiconaxius farreae Ortmann, 1891 最初是根据日本中部相模湾的标本描述的。对从相模湾和附近地区采集的许多 Eiconaxius 标本进行的形态学检查，以及线粒体 COI 和 16S rRNA 基因的遗传数据显示，这些标本代表了三个物种。这一发现促使人们重新评估了 E. farreae 和 E. mortenseni Sakai, 1992 的身份，这两个物种最初也是在相模湾被描述的。Farreae 的同分型材料中混入了两个物种（E. farreae 和一个未描述的物种），因此，为了命名的稳定性，指定了 E. farreae 的讲座模式。在这里，E. farreae 和 E. mortenseni 被重新描述，第三个种被描述为新种 E. reconditus。新种在形态上与 E. mortenseni 非常相似。对近缘种之间的区别特征进行了重新评估。根据目前的发现，对 E. farreae 以前的记录进行了回顾。
期刊介绍：
Zootaxa is a peer-reviewed international journal for rapid publication of high quality papers on any aspect of systematic zoology, with a preference for large taxonomic works such as monographs and revisions. Zootaxa considers papers on all animal taxa, both living and fossil, and especially encourages descriptions of new taxa. All types of taxonomic papers are considered, including theories and methods of systematics and phylogeny, taxonomic monographs, revisions and reviews, catalogues/checklists, biographies and bibliographies, identification guides, analysis of characters, phylogenetic relationships and zoogeographical patterns of distribution, descriptions of taxa, and nomenclature. Open access publishing option is strongly encouraged for authors with research grants and other funds. For those without grants/funds, all accepted manuscripts will be published but access is secured for subscribers only.
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