Xenocheira Haswell, 1879

Hughes, Lauren Elizabeth, 2017, Review of Xenocheira Haswell, 1879 (Crustacea: Amphipoda: Aoridae), Records of the Australian Museum 69 (4), pp. 223-236: 224-225

publication ID

http://doi.org/ 10.3853/j.2201-4349.69.2017.1664

publication LSID

lsid:zoobank.org:pub:E9B173E5-BFE1-4806-BC2C-BCEE1387AA4E

persistent identifier

http://treatment.plazi.org/id/811F87CD-A139-9F59-659A-EC27714EC183

treatment provided by

Felipe

scientific name

Xenocheira Haswell, 1879
status

 

Xenocheira Haswell, 1879  

Xenocheira Haswell, 1879: 272   . — Haswell, 1885: 105. — Stebbing, 1906: 624. — Moore, 1988: 706. — Myers, 1988: 191. —Barnard & Karaman, 1991: 240–241, fiGs 45E, 46E. —Lowry & Stoddart, 2003: 73 (catalogue).

Generic diagnosis. Sternal processes absent. Mandibular molar triturative, palp article 3 longer than 2, posterodistal margin straight, with setae of several lengths. Maxilliped basal endiTe anTeriOr marGin wiThOUT winG-like flanGes. Gnathopod 1 merus short; carpus shorter than propodus. Male gnathopod 1 propodus enlarged. Female gnathopod 1 simple to weakly subchelate. Male and female gnathopod 2 carpUs anTeriOr marGin wiTh flanGe, wiTh line Of lOnG

Included species. Xenocheira fasciata Haswell, 1879   ; X. longisetosa Ren, 2006   ; X. pirloti Moore, 1988   and X. xandrothrix   sp. nov.

Remarks. Haswell’s original description of Xenocheira   was of a female specimen only, collected in Port Jackson, New SOUTh Wales. MOOre (1988) was The firsT TO describe a male specimen of Xenocheira   using material collected from Tasmania. This important contribution established that Xenocheira   males are sexually dimorphic.

Xenocheira   is close to Bemlos Shoemaker, 1925   and Autonoe   , which are all sexually dimorphic genera where the propodus of gnathopod 1 is larger in males. Xenocheira   and Bemlos   can be separated from Autonoe   by the carpus of gnathopod 1 being shorter than the propodus in males. Xenocheira   differs frOm Bemlos   in the presence of an anterior carpal flanGe lined wiTh seTae On GnaThOpOd 2 in bOTh males and females.

Xenocheira spp.   are similar to Autonoe seurati Chevreux, 1907   which alsO has a flanGe and seTae, wiTh A. seurati   being the only Autonoe species   with this character state. Xenocheira   can be separated from all Autonoe species   by the mandibular palp article 3 straight posterodistal margin (versus concave); the gnathopod 1 carpus which is shorter than the propodus (versus subequal) and the uropod 3 rami with long robust and slender setae (versus robust setae only).

Key to males of Xenocheira Haswell, 1879 species 1   Gnathopod 1 propodus palm weakly obtuse ............................................................................. 2

—— Gnathopod 1 propodus palm transverse to subacute ................................................................. 3 2 Gnathopod 1 dactylus posterior margin smooth ................................. X. fasciata Haswell, 1879  

—— Gnathopod 1 dactylus posterior margin with proximal hump ................ X. xandrothrix   sp. nov.

3 Gnathopods 1 and 2 basis anterior margin without rows of slender setae ........................................................................................... X. pirloti Moore, 1988   .

—— Gnathopods 1 and 2 basis anterior margin with rows of slender setae ..................................................................................................... X. longisetosa Ren, 2006  

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Aoridae

Loc

Xenocheira Haswell, 1879

Hughes, Lauren Elizabeth 2017
2017
Loc

Xenocheira

Moore, P 1988: 706
Myers, A 1988: 191
Stebbing, T 1906: 624
Haswell, W 1885: 105
Haswell, W 1879: 272
1879