Electronic Supplement 18
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Organisms
Diversity & Evolution 3 (2003) Electronic Supplement 18 |
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Jana Hoffmann:
Redescription of Griffithsius latipes
(Griffiths, 1976) (Crustacea, Amphipoda, Phoxocephalidae) from the coast of
Namibia.
print version: Org. Divers. Evol. 3(4): 307. 2003 (abstract)
electr.
suppl.: full article. pdf-format, 3.2 MB
Abstract:
A full redescription of Griffithsius latipes
(Griffiths, 1976) is given. This is necessary because the original description
is incomplete and contains inaccuracies.
Griffiths (1976) gave a detailed
description of Mandibulophoxus latipes, illustrated with two plates.
From this publication the present author was initially convinced that her new
material belonged to a new species. However, when the type material of M.
latipes was examined in order to furnish a good differential diagnosis, it
became clear that all specimens belong to a single species, but that Griffiths'
drawings do not match his types in all details. The fuller description and
complete illustrations given herein now enable the accurate determination of
the species.
The key features for recognition of Griffithsius
latipes (Griffiths) are pereopods 5 and 6. In Griffiths' drawing of
pereopod 5 the carpus has an almost circular shape, whereas in the studied
specimens this article is rather ellipsoid. Pereopod 6 in Griffiths' figure has
the merus much longer than wide, with the posterior margin weakly convex. In
the types and the new material this article looks completely different: it is
wider than long, as the posterior margin is strongly lobate. The dactylus is
much shorter than the propodus in Griffiths' drawing, in the redescribed
material these articles are subequal in length.
Similar inconsistencies can
be observed on antenna 2: the 4th article of the peduncle is ovoid, whereas in
Griffiths' drawing it appears subrectangular; on uropod 3 the second article of
the outer ramus of the redescribed material is relatively longer (1:3) compared
to the basal article in Griffiths' illustration (1:4).
Key words: Crustacea, Amphipoda, Phoxocephalidae, Griffithsius
latipes, Namibia, taxonomy
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