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Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Congruence between male upper lip morphology and molecular phylogeny in Parapolycope (Ostracoda), with two new species from Korea

Ivana Karanovic A B E , Hayato Tanaka C and Akira Tsukagoshi D
+ Author Affiliations
- Author Affiliations

A Department of Life Science, College of Natural Science, Hanyang University, Seoul 133-791, South Korea.

B Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, Tas. 7001, Australia.

C Takehara Marine Science Station, Setouchi Field Science Center, Graduate School of Biosphere Science, Hiroshima University, Japan.

D Department of Geoscience, Faculty of Science, Shizuoka University, Japan.

E Corresponding author. Email: ivana@hanyang.ac.kr

Invertebrate Systematics 30(3) 231-254 https://doi.org/10.1071/IS15056
Submitted: 17 November 2015  Accepted: 15 January 2016   Published: 29 June 2016

Abstract

The ostracod genera Parapolycope Klie, 1939 and Kliecope Tanaka, Tsukagoshi & Karanovic, 2014 have a sexually dimorphic upper lip, and males use their lip during courtship. Here we study the male upper lip of 14 species in order to find homologous structures. For this purpose, the lip is divided into six homologous parts, determined by their relative position on the lip and the lip’s position in relation to other body parts. We found that the distal part (‘c’) is the most variable across taxa, probably due to high sexual selection. Six characters of the male upper lip are used in our cladistic analysis, along with another 12, in order to study phylogenetic relationships between Parapolycope species from East Asia. In addition, 18S rRNA is used to reconstruct molecular phylogeny and test the congruence between morphological and molecular data. The recovered topology on all obtained trees is almost identical, emphasising the importance of the male upper lip morphology in interpreting phylogenetic relationships in this peculiar ostracod group. Parapolycope viriosa, sp. nov. and P. widoensis, sp. nov. from marine interstitial habitats in South Korea are described here. To aid further identification of the 12 East Asian Parapolycope species we provide a taxonomic key.

Additional keywords: biodiversity, Crustacea, East Asia, meiofauna, 18S rRNA.


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