North American Condyloderes (Kinorhyncha: Cyclorhagida: Kentrorhagata): Female dimorphism suggests moulting among adult Condyloderes

Martin V Sørensen,David Thistle,Stephen C Landers

doi:10.1016/j.jcz.2019.05.015

Abstract

Two new species of Condyloderes are described, C. rohalorum sp. nov. from the deep-sea off California, and Condyloderes flosfimbriatus sp. nov. from the continental shelf in the northern Gulf of Mexico. Additional species are furthermore reported from the two regions, including Condyloderes kurilensis from the Californian deep-sea, one potentially new species from each of the two regions, and the presence of specimens similar to, and potentially conspecific with, the two new species, i.e., Condyloderes cf. C. rohalorum sp. nov. in the Gulf of Mexico, and Condyloderes cf. C. flosfimbriatus sp. nov. from the Californian deep-sea. Examinations of C. rohalorum sp. nov. reveal that the species has two different adult female stages, hence representing the first example of adult female dimorphism known from this genus, and indicating that adult moulting might happen amongst species of Condyloderes.

Highlights

Condyloderes used to be one of smaller and more species-poor kinorhynch genera
Samples off the US west coast were collected in September 2008, during a deep-sea meiofauna cruise organized by second author, DT
Additional non-type specimens from California used in the description include one female stage 1, two females stage 2, and one juvenile, all from St

Summary

Introduction

Condyloderes used to be one of smaller and more species-poor kinorhynch genera. Literature on the genus has been rather limited compared to other kinorhynch groups, but recently it has been subject of increased attention. I.e., Neuhaus et al (2019) published a recent revision of the genus, and additional new species from the Mediterranean Sea are currently being described (Dal Zotto et al 2019). The first species of the genus was described from the Northeast Atlantic by McIntyre (1962) and named Centroderes multispinosus McIntyre, 1962. More than three decades followed before additional species appeared in the literature. Adrianov et al (2002) described the Japanese species Condyloderes More than three decades followed before additional species appeared in the literature. Adrianov et al (2002) described the Japanese species Condyloderes

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Discussion

Conclusion