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Open AccessArticle

A New Species of Monstrillopsis Sars, 1921 (Copepoda: Monstrilloida) with an Unusually Reduced Urosome

1
Department of Life Science, Chung-Ang University, 84 Heukseok-ro, Seoul 06974, Korea
2
Department of Life Science, Hanyang University, 222 Wangsimni-ro, Seoul 04763, Korea
3
Faculty of Marine Technology, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollanam-do 59626, Korea
*
Author to whom correspondence should be addressed.
Diversity 2020, 12(1), 9; https://doi.org/10.3390/d12010009
Received: 27 November 2019 / Revised: 17 December 2019 / Accepted: 18 December 2019 / Published: 20 December 2019
(This article belongs to the Special Issue Meiofauna Biodiversity and Ecology)
Male monstrilloid copepods, described herein as Monstrillopsis paradoxa sp. nov., were collected from the Chuja Islands, Jeju, Korea, using a light trap. They display many of the common features of Monstrillopsis, including large, prominent eyes, an anteriorly positioned oral papilla, and four setae on each caudal ramus. Type-2 modification of the antennules further supports the assignment of the new species to Monstrillopsis. However, the present specimens have an unusually low number of urosomal somites, just three in total, compared to five in males of all congeneric species, and from four (in Cymbasoma) to five in males of all other monstrilloid genera. Up until now, in the Monstrilloida only females of Cymbasoma have been known to have as few as three urosomal somites. View Full-Text
Keywords: Monstrillidae; Monstrillopsis paradoxa sp. nov.; Monstrillopsis planifrons; morphological taxonomy; tagmosis; male genitalia; pore pattern; male/female matching; marine invertebrate host; semi-parasitic; Korea Monstrillidae; Monstrillopsis paradoxa sp. nov.; Monstrillopsis planifrons; morphological taxonomy; tagmosis; male genitalia; pore pattern; male/female matching; marine invertebrate host; semi-parasitic; Korea
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Jeon, D.; Lee, W.; Soh, H.Y.; Eyun, S.-I. A New Species of Monstrillopsis Sars, 1921 (Copepoda: Monstrilloida) with an Unusually Reduced Urosome. Diversity 2020, 12, 9.

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