Biology:Pseudotanais jonesi

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Short description: Species of crustacean

Pseudotanais jonesi
Scientific classification
P. jonesi
Binomial name
Pseudotanais jonesi
Sieg, 1977 [1]

Pseudotanais jonesi is a species of tanaidacean crustacean.


Males of Pseudotanais jonesi are approximately 1 millimetre (0.04 in) long, while females are 0.8–1.0 mm (0.03–0.04 in) long.[2] There are neither eyes nor ocular lobes on the head.[2] Males are very similar to P. forcipatus, which is the only other species in the family to occur around the British Isles.[2] In females, the cephalothorax is about 1.5 times as wide as it is long, and is triangular.[2] Both the endopodite and the exopodite of the females' uropods are two-segmented, while males have a three-segmented endopodite.[2]


Pseudotanais jonesi has only been discovered at a few sites around the British Isles. It is reported to be "fairly common"[3] off the Isle of Man, where it lives in muddy substrates at depths of 32–90 metres (105–295 ft); it also occurs at depths of 20–38 m (66–125 ft) in Loch Creran and the Lynn of Lorn in western Scotland.[2]


  1. Jürgen Sieg (1977). "Taxonomische Monographie der familie Pseudotanaidae (Crustacea, Tanaidacea)" (in German). Mitteilungen aus dem Zoologischen Museum in Berlin 53 (1): 1–109. doi:10.1002/mmnz.19770530102. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 David Malcolm Holdich & Jacqueline Anne Jones (1983). "Family Pseudotanaidae Sieg, 1976". Tanaids: keys and notes for the identification of the species. Volume 27 of Synopses of the British fauna. Cambridge University Press. pp. 80–85. ISBN 978-0-521-27203-2. 
  3. D. M. Holdich & J. A. Jones (1983). "The distribution and ecology of British shallow-water tanaid crustaceans (Peracarida, Tanaidacea)". Journal of Natural History 17 (2): 157–183. doi:10.1080/00222938300770141. 

Wikidata ☰ Q3855033 entry