Ohtakiana Fend & Torii, 2024

Martin, Patrick, Fend, Steven, Martinsson, Svante, Klinth, Mårten, Torii, Takaaki & Erséus, Christer, 2024, Towards an integrative revision of Haplotaxidae (Annelida: Clitellata), Zoological Journal of the Linnean Society (zlae 141) 202 (4), pp. 1-38 : 22

Ohtakiana Fend & Torii gen. nov. (clade 4 in Fig. 1 )

ZooBank LSID: urn:lsid:zoobank.org:act:

Type species: By monotypy, Ohtakiana kakidaensis Fend & Torii sp. nov.

Etymology

Named for Prof. Akifumi Ohtaka, in appreciation for his many contributions to the study of Japanese oligochaetes and branchiobdellidans.

Diagnosis

Chaetae four pairs per segment, simple-pointed, sigmoid, nodulate, with dorsal pairs slightly smaller than ventral. Pharynx eversible, with large pharyngeal glands; gut with chloragogen layer. Nephridial ducts simple, tubular. Dorsal and ventral blood vessels connected by long commissural vessels. Large midventral glands in post-clitellar segments. Clitellum one cell thick. Spermathecae 3 pairs, pores anterolateral in VI–VIII. Two pairs of testes in X–XI, two pairs of ovaries in XII–XIII, eggs mesolecithal. Gonoducts simple, plesioporous; male ducts tubular, with pores slightly anterior to ventral chaetae; female ducts are conical funnels, with pores anterior to ventral chaetae.

Figures

Figure 1. Phylogenetic tree of Clitellata estimated with Bayesian inference in MrBayes, using a concatenated set of markers, i.e. 12S, 16S, COI, 18S, and 28S. The tree is rooted such that Parvidrilidae and Randiellidae (also Clitellata) appear as lineages outside the rest of the ‘Clitellata’ tree, a position strongly supported by the metagenomic analyses of Erséus et al. (2020). Haplotaxid like taxa are shaded.Support values at branches are posterior probabilities, scale represents expected number of changes/site. Capital letters at the end of the species codes in Haplotaxis indicate countries of origin.BEN: Benin, FR: France, GR: Greece, IT: Italy, JP: Japan, SE: Sweden, US: USA. Inset, photo of live specimen of Haplotaxis spSE in its natural habitat, soil soaked in groundwater, photo: Johan Wingborg, and photo of live specimen of Haplotaxis spBEN6, photo: Patrick Martin.