Notes on Several Japanese Species of <i>Iwogumoa</i> and <i>Coelotes</i> (Araneae: Agelenidae: Coelotinae)

Abstract

Iwogumoa songminjae (Paik and Yaginuma in Paik et al., 1969) is recorded for the first time from Japan on the basis of specimens collected in the Tsushima Islands, Kyushu and previously identified as I. insidiosa (L. Koch, 1878). The relationships among the Japanese species of Iwogumoa Kishida, 1955 are analyzed using mitochondrial cytochrome c oxidase subunit I with various Japanese species of Coelotes Blackwall, 1841 sensu lato as the outgroup. A new synonym is proposed through a comparison of morphological characteristics and the results of our molecular analysis: Coelotes iyoensis Nishikawa, 2009 (known only from the male) is a junior synonym of Coelotes mohrii Nishikawa, 2009 (known only from the female).

Three new genera with taxonomic revisions of the subfamily Coelotinae (Araneae: Agelenidae) from Japan

“…n. from the type species A. unicatus were 0.077 and 0.067, respectively (p-distances from A. unicatus were 0.108-0.117 in the four other species). In previous studies, clear parapatric distributions among the species of Aeolocoelotes have been shown (Okumura et al 2019;Okumura unpublished data). This distribution pattern also provides evidence that these species are closely related.…”

“…unique, and is clearly distinguished from that of other coelotine spiders. For details, refer to Okumura et al (2019). The epigyne of this species is similar to that of A. bifurcatus, but is distinguishable by the longer epigynal teeth relative to those of the latter species.…”

“…In the classification of coelotine spiders, not only genital organs but also the number of the retromarginal teeth on the chelicerae are regarded as important morphological characteristics; accordingly, some detailed studies of these spiders, including one based on the presumption of a phylogenetic relationship, have been conducted (Wang 2002(Wang , 2003Wang & Jäger 2008, 2010. In recent years, molecular phylogenetic analyses have been actively performed to clarify the taxonomy and phylogeny of coelotine spiders (Bi et al 2005;Chen et al 2015aChen et al , b, 2016Li et al 2018aLi et al , b, c, 2019aMiller et al 2010;Okumura et al 2016Okumura et al , 2017Okumura et al , 2019Spagna & Gillespie 2008;Zhang & Marusik 2016;Zhang et al 2016a, b;, 2017. These new methods have enabled more objective analyses based on DNA base sequences, and their importance is increasing relative to other forms of morphological analysis.…”

A new synonymy of <I>Coelotes oshimaensis</I> Shimojana 2000 (Araneae: Agelenidae: Coelotinae) in Japan

“…Many Japanese Coelotinae species have been assigned to the genus Coelotes. However, genetic data, as well as detailed morphological investigations, have demonstrated that these species actually belong to several heterogeneric groups (Okumura 2020;Okumura et al 2017Okumura et al , 2019Okumura et al , 2022. According to the morphological characteristics of male and female genital organs, there are five species that are closely related to Coelotes oshimaensis, all inhabiting the Ryukyu Islands (Shimojana 2003).…”

“…Of these, 121 species are known to occur in Japan (World Spider Catalog 2022). While recent progress has been made in the taxonomic revisions of this subfamily in Japan (Okumura 2017(Okumura , 2020Okumura et al 2016Okumura et al , 2017Okumura et al , 2019Okumura et al , 2021Okumura et al , 2022, many problems still remain. As an example, there are still many species that are considered in need of synonymization.…”