Redescription of the endemic Australian cladoceran Alona willisi (Smirnov, 1989) and its assignment to Acanthalona gen. nov. (Cladocera: Anomopoda: Chydoridae)

ARTEM Y. SINEV; TSUYOSHI KOBAYASHI

doi:10.11646/zootaxa.3390.1.4

Issue: Vol. 3390 No. 1: 17 Jul. 2012

Type: Articles

Published: 2012-07-17

DOI: 10.11646/zootaxa.3390.1.4

Page range: 43–55

Abstract views: 35

PDF downloaded: 1

**Redescription of the endemic Australian cladoceran Alona willisi (Smirnov, 1989) and its assignment to Acanthalona gen. nov. (Cladocera: Anomopoda: Chydoridae)**

ARTEM Y. SINEV⁺⁻
TSUYOSHI KOBAYASHI⁺⁻

Department of Invertebrate Zoology, Biological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia

Scientific Services Division, Office of Environment and Heritage NSW, Department of Premier and Cabinet, P.O.Box A290 Sydney South NSW 1232, Australia

Crustacea apomorphies Acanthalona gen. nov. Armatalona Australian endemism Cladocera Matralona Royal National Park sister groups synapomorphies

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Abstract

Alona willisi (Smirnov, 1989) (Anomopoda: Chydoridae) is a poorly known cladoceran endemic to Australia. The presentmorphological study revealed numerous unique and rare features of the species and justifies its assignment to Acanthalona gen.nov. The new genus differs by its postabdomen armed with very long, thick marginal denticles and by exopodite of limb Vwith only three setae. It also differs from most Aloninae by antennal formula (setae 0-0-3/0-1-2, spines 1-0-1/0-0-1), sharedonly with Bryospilus Frey, 1980. In our opinion, Acanthalona gen. nov. is related to Armatalona Sinev, 2004 and MatralonaVan Damme & Dumont, 2009. These three genera form a clade, basal for the subfamily, and not directly related to the majorityof Aloninae. The records of A. willisi show that the species inhabits both acidic and alkaline freshwaters and seems to be algivorous as well as detritivorous.

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