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Issue: Vol. 4950 No. 3: 31 Mar. 2021
Type: Article
Published: 2021-03-31
DOI: 10.11646/zootaxa.4950.3.3
Page range: 469–486
Abstract views: 174
PDF downloaded: 11

Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea: Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand

Aquatic Science and Innovative Management Division, Faculty of Natural Resources; and Discipline of Excellence for Sustainable Aquaculture, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Biodiversity & Geosciences Program, Queensland Museum, PO Box: 3300, South Brisbane BC, Queensland 4101, Australia; and Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa.
Crustacea Isopoda Cirolanidae Cirolana new species western Gulf of Thailand coral reefs

Abstract

Cirolana khamensis sp. nov. and C. parawongat sp. nov. are described from specimens collected in the western Gulf of Thailand at depths of 8 metres and 1 metre, respectively. Both species belong to the Cirolana ‘pleonastica-group’ with tubercles on the dorsal surfaces, transverse sutures on the pereonites, pleonite 3 not posteriorly produced and pleonite 4 posterolaeral margin rounded. Cirolana khamensis sp. nov. can be distinguished from other species of Cirolana ‘pleonastica-group’ by lateral margin of uropodal exopod having five robust seatae and a continuous row of plumose marginal setae, pereonites 1–3 each with a single transverse impressed line; antennula peduncle with articles 1 and 2 distinct and articulated peduncle; pleotelson dorsal surface with two sub-median longitudinal carinae, each of which has four prominent tubercles. Cirolana parawongat sp. nov. can be distinguished by pereonites 1–3 without a single transverse impressed line and having nine tubercles on pleonite 4 and 5. A dichotomous key to Cirolana ‘pleonastica-group’ in South-East Asia region is given.

 

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