Abstract

The Tasmanian mountain shrimps of the genus Anaspides Thomson, 1894 (Syncarida: Anaspididae), are endemic to Tasmania and often regarded as “living fossils” owing to the retention of numerous putatively plesiomorphic eumalacostracan traits and minimal morphological change since the Triassic. All live in cold, usually high altitude fresh-waters. Until recently, only two species were recognised: the presumed widespread A. tasmaniae (Thomson, 1893) (type species) and A. spinulae Williams, 1965a, from Lake St Clair, whose validity was frequently questioned. Independent morphological and molecular studies revealed previously unrecognized taxonomic diversity, resulting in preliminary descriptions of three new species in 2015. Anaspides is revised based on extensive collections from throughout Tasmania. Telson structure and male secondary sexual characters proved taxonomically instrumental. Seven species are recognized of which two are new to science; all are fully figured and morphological variation is discussed in detail. Rather than being widespread, Anaspides tasmaniae is restricted to Mount Wellington; A. spinulae is a valid species known only from Lake St Clair. Two species, A. clarkei Ahyong, 2015, and A. eberhardi sp. nov. occur only in caves of the Ida Bay-Hastings karst systems and Junee-Florentine systems, respectively. The three widest ranging species (A. jarmani Ahyong, 2015, A. swaini Ahyong, 2015, and A. richardsoni sp. nov.) are primarily epigean and each contains several morphological forms that might warrant further taxonomic subdivision. Distributions of species of Anaspides are largely discrete and broadly correspond to the biogeographical discontinuity known as Tyler’s Line, dividing the drier eastern from the wetter western parts of Tasmania. Caves are believed to have acted as oligothermal refuges for Anaspides in the past, and it is notable that the specimens from the lowest altitudes today are all from caves, including the northernmost record of Anaspides (A. richardsoni, Great Western Cave, Gunns Plain, 109 m asl). Given the revised taxonomy of Anaspides, with significantly altered species distributions, the conservation status of all species of the genus requires review.

 
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Bibliographic Data

Short Form
Ahyong, 2016. Rec. Aust. Mus. 68(7): 313–364
Author
Shane T. Ahyong
Year
2016
Title
The Tasmanian Mountain Shrimps, Anaspides Thomson, 1894 (Crustacea, Syncarida, Anaspididae)
Serial Title
Records of the Australian Museum
Volume
68
Issue
7
Start Page
313
End Page
364
DOI
10.3853/j.2201-4349.68.2016.1669
Language
English
Date Published
07 December 2016
Cover Date
07 December 2016
ISSN
ISSN 0067-1975 (print); ISSN 2201-4349 (online)
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
TAXONOMY; CRUSTACEA: SYNCARIDA; BIOGEOGRAPHY
Digitized
07 December 2016
Available Online
07 December 2016
Reference Number
1669
EndNote
/Uploads/Journals/36287/1669.enw
Title Page
/Uploads/Journals/36287/1669.pdf
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Complete Work
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