Abstract

The Tasmanian Lake Shrimps of the genus Paranaspides Smith, 1908 (Syncarida: Anaspidesidae) are endemic to lakes on the eastern Central Plateau, Tasmania, namely Great Lake, Shannon Lagoon, Penstock Lagoon, Arthurs Lake and Woods Lake. Prior to the present study, only the type species, P. lacustris Smith, 1908, was recognized. Reconsideration of Paranaspides from throughout its range, however, showed that Paranaspides from Arthurs Lake and Woods Lakes are referrable to a new species, P. williamsi sp. nov. Morphometric differences in the uropodal exopod and maxilliped, and subtle differences in the morphology of the male pleopods 1 and 2, and colour-in-life distinguish the two species. Genetic divergence (p-distance) between the two species exceeds 10% in mitochondrial COI and 3% in 16S. Both species are described and illustrated, and a lectotype fixed for P. lacustris. Although P. lacustris and P. williamsi occur in relatively close proximity, they occupy different drainages. The Great Lake-Shannon Lagoon-Penstock Lagoon system drains to the southeast, and the Arthurs Lake-Woods Lake system to the northeast. The distributions of P. lacustris and P. williamsi precisely parallel those of a cognate pair of galaxiid fishes, Paragalaxias eleotroides and Paragalaxias mesotes. Given the geological history of the Central Plateau and molecular divergence estimates for Paragalaxias, Paranaspides may also have diverged prior to the Pleistocene glaciations. Species of Paranaspides are dependent on their shallow water algal bed habitat, making them highly susceptible to sudden or significant fluctuations in lake water levels as a result of hydroelectric operations. Both species of Paranaspides have small areas of occupancy and are prone to the effects of hydroelectric activities on their lake habitats; under IUCN Red List criteria, their conservation status corresponds to Vulnerable (D2).

 
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Bibliographic Data

Short Form
Ahyong et al., 2017. Rec. Aust. Mus. 69(4): 259–275
Author
Shane T. Ahyong; Martin Schwentner; Stefan Richter
Year
2017
Title
The Tasmanian Lake Shrimps, Paranaspides Smith, 1908 (Crustacea, Syncarida, Anaspidesidae)
Serial Title
Records of the Australian Museum
Volume
69
Issue
4
Start Page
259
End Page
275
DOI
10.3853/j.2201-4349.69.2017.1679
Language
EN
Date Published
06 September 2017
Cover Date
06 September 2017
ISSN
ISSN 0067-1975 (print); ISSN 2201-4349 (online)
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
CRUSTACEA: SYNCARIDA; TAXONOMY
Digitized
06 September 2017
Available Online
06 September 2017
Reference Number
1679
EndNote
/Uploads/Journals/37872/1679.enw
Title Page
/Uploads/Journals/37872/1679.pdf
File size: 254kB
Complete Work
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