Africorchestia , Lowry, James K. & Coleman, Charles Oliver, 2011

Lowry, James K. & Coleman, Charles Oliver, 2011, Africorchestia a new genus of sand-hoppers (Crustacea: Amphipoda: Talitridae) from western Africa and south-western Europe, Zootaxa 2825, pp. 55-68: 56-58

publication ID

http://doi.org/ 10.5281/zenodo.277263

publication LSID

lsid:zoobank.org:pub:8484DF52-5964-4D9F-B4CF-E159E6B8D636

DOI

http://doi.org/10.5281/zenodo.3508078

persistent identifier

http://treatment.plazi.org/id/03BE87D2-FFB1-EE63-FF28-6FDBFC4EFDD7

treatment provided by

Plazi

scientific name

Africorchestia
status

gen. nov.

Africorchestia  gen. nov.

Description. Antenna 2 peduncular articles narrow; with many large robust setae. Mandible left lacinia mobilis 5 - dentate. Maxilliped palp article 2 distomedial lobe well developed, article 4 reduced, button-shaped. Gnathopod 1 parachelate; posterior margin of carpus and propodus each with lobe covered in palmate setae in male, posterior margin of merus, carpus and propodus each without lobe covered in palmate setae in female; palm transverse in male. Gnathopod 2 subchelate in male; mitten-shaped in female. Pereopods 2–4 coxae as wide as deep. Pereopods 3–7 cuspidate. Pereopods 6–7 longer than pereopods 3–5, with slender setae along posterior margin of dactyli. Pereopod 6 basis expanded in male. Pleonites 1–3 with dorsal sculpturing (spines or ridges) in males (absent in females where known). Pleopods all well developed. Pleopod 1 peduncle with marginal robust setae. Uropod 1 peduncle distolateral robust seta present; inner and outer rami with marginal robust setae. Uropod 2 not sexually dimorphic; inner and outer rami with marginal robust setae. Uropod 3 ramus longer than peduncle or subequal in length to peduncle. Telson  with marginal and apical robust setae, with 3 to 6 robust setae per lobe.

Type species. Orchestia spinifera Mateus, 1962  , original designation.

Included species. Africorchestia  includes 5 species: A. fischeri (H. Milne Edwards, 1830)  ; A. quadrispinosa ( K.H. Barnard, 1916)  ; A. skoogi ( Stebbing, 1922)  ; A. spinifera ( Mateus, 1962)  ; A. tricornuta ( Shoemaker, 1920)  . Remarks. Africorchestia  appears to be most similar to Americorchestia Bousfield, 1991  and Sardorchestia Ruffo  in Tafani et al., 2004. Americorchestia  and Africorchestia  are similar in most characters including the male parachelate first gnathopods and the characteristic third uropods with the ramus longer than the peduncle. They differ in the pleosome which is sculptured in Africorchestia  , in pereopod 6 which is sexually dimorphic in Africorchestia  , and in the dactyli of pereopods 6 and 7 which have slender setae along the posterior margin in Africorchestia  .

Africorchestia  is also very similar to Sardorchestia  . They differ significantly in the dactyli of pereopods 6 and 7 with setae along the posterior margin in Africorchestia  (absent in Sardorchestia  ); in pereopod 6 which is sexually dimorphic in Africorchestia  ; and pleonites 1–3 rugose or with spines (absent in Sardorchestia  ).

Americorchestia  and Sardorchestia  are very similar. In Sardorchestia  the male gnathopod 2 propodus has a large posteroproximal thumb and there are more robust setae on the telson  , but this character appears to be continuous between these genera. Based on the morphology Americorchestia  and Sardorchestia  could be synonymised and the Mediterranean species Sardorchestia pelecaniformes ( Bellan-Santini & Ruffo, 1986)  and Talorchestia ugolini Bellan-Santini & Ruffo, 1991  would both fall into Americorchestia  .

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Talitridae

Loc

Africorchestia

Lowry, James K. & Coleman, Charles Oliver 2011
2011
Loc

Talorchestia ugolini

Bellan-Santini & Ruffo 1991
1991
Loc

Sardorchestia pelecaniformes (

Bellan-Santini & Ruffo 1986
1986