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Issue: Vol. 5468 No. 2: 12 Jun. 2024
Type: Article
Published: 2024-06-12
DOI: 10.11646/zootaxa.5468.2.5
Page range: 331-349
Abstract views: 5
PDF downloaded: 0

Redescription of Ilyocryptus raridentatus Smirnov, 1989 (Cladocera: Ilyocryptidae)

A. N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences; Leninsky Prospect 33; Moscow 119071; Russia
Southern Branch of Joint Vietnam-Russian Tropical Science and Technology Research Center; No. 3; 3/2 Street; District 10; Ho Chi Minh City; Vietnam
R.J. Shiel & Assoc.; 3 Hillcrest Ave; Crafers West; SA 5152; Australia
A. N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences; Leninsky Prospect 33; Moscow 119071; Russia
Crustacea Branchiopoda Anomopoda taxonomy Australia East Asia

Abstract

During recent years, many taxa of water fleas (Crustacea: Cladocera) with wide distribution ranges were revised and finally accepted as groups of cryptic species. Here we provide a redescription of Ilyocryptus raridentatus Smirnov, 1989 (Anomopoda: Ilyocryptidae). Our study clearly confirms that I. raridentatus belongs to the sarsi-group based on incomplete moulting, absence of dorsal keel, structure of antennule, thoracic limb I and postabdomen. The species is widely distributed in Australia and East Asia (Malaysia, Thailand, Vietnam, Central China, Japan, South Korea) and penetrates north to the Far East of Russia. A morphological variability among different populations of I. raridentatus does not exceed an intrapopulational level. I. raridentatus seems to be a relatively rare species with a benthic lifestyle similar to its congeners.

 

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