Notorchestia, Serejo & Lowry, 2008

Serejo, C. S. & Lowry, J. K., 2008, The Coastal Talitridae (Amphipoda: Talitroidea) of Southern and Western Australia, with Comments on Platorchestia platensis (Krøyer, 1845), Records of the Australian Museum 60 (2), pp. 161-206 : 175

publication ID

https://doi.org/ 10.3853/j.0067-1975.60.2008.1491

publication LSID

lsid:zoobank.org:pub:B8C054B3-B585-47BA-BF79-7AFBC6DD7695

DOI

https://doi.org/10.5281/zenodo.5238599

persistent identifier

https://treatment.plazi.org/id/86F1E0AF-C800-44DB-98B8-7DDB799A01EB

taxon LSID

lsid:zoobank.org:act:86F1E0AF-C800-44DB-98B8-7DDB799A01EB

treatment provided by

Felipe

scientific name

Notorchestia
status

gen. nov.

Notorchestia View in CoL n.gen.

Orchestia J.L. Barnard, 1969: 470 View in CoL (partim).

Talorchestia Dana, 1852: 851 View in CoL .– Stebbing, 1906: 543 (partim).– Stephensen, 1948: 7 (partim).–J.L. Barnard, 1969: 472 (partim.).

Type species. Notorchestia lobata View in CoL n.sp.

Etymology. Noto means southern and refers to the distribution of the genus, attached to the stem Orchestia from the Greek orchestes = dancer.

Diagnosis. Antenna 2 not geniculate and not sexually dimorphic. Mandible left lacinia mobilis 4 or 5 dentate. Maxillipedal palp dactylus present, reduced. Gnathopod 2 subchelate; basis slightly expanded; propodus palm posterodistal corner with or without protuberance. Pereopods 3–7 cuspidactylate, dactylus with row or patch of dorsal setae. Pereopod 4 carpus similar in length to pereopod 3 carpus. Pereopod 6 not sexually dimorphic. Pereopod 7 sexually dimorphic or not; basis lateral sulcus present or absent, if present very pronounced. Gills lobate and/or convoluted; gills 3–5 smaller than gills 2 and 6. Oostegites 2–5 setae with simple and multi-furcate tips. Pleopods all well developed. Uropods 1–2 outer rami with marginal robust setae. Telson cleft, longer than broad with 3–5 robust setae per lobe.

Species composition. Notorchestia contains 4 species: N. australis ( Fearn-Wannan, 1968) ; N. lobata n.sp.; N. naturaliste n.sp. and N. novaehollandiae ( Stebbing, 1899) .

Remarks. The weakness of the definition of Orchestia and Talorchestia based on the female gnathopod 2 chelation is herein reconfirmed. A restricted definition of Talorchestia (sensu stricto) was proposed by Morino and Miyamoto (1988) and Miyamoto and Morino (1999), but this is incomplete because it leaves a large number of species with no generic name. A revision of the whole complex is still needed. Some species within Notorchestia were part of the Talorchestia (sensu lato) group, a wide complex currently including about 35 species. We move eight species to Bellorchestia and two to Notorchestia , reducing the number of unplaced species to 25.

Notorchestia n.gen. is endemic to Australia, and its species show new characters for the Talitridae in general, such as the dactylus of pereopod 3–7 with a dorsal row of setae ( Figs 14 View Fig , 18 View Fig ), the multi-furcate tip setae on oostegites 2–5 ( Fig. 12 View Fig , 16 View Fig , 20 View Fig ) and a clearly cleft telson ( Fig. 11 View Fig , 15 View Fig , 19 View Fig ). Notorchestia is a member of the 4-dentate left lacinia mobilis group. The one exception is found in N. australis , which has a 4 or 5-dentate left lacinia. Not all of the diagnostic characters were observed in N. novaehollandiae , but the lateral sulcus on the basis of pereopod 7 and cleft telson strongly suggests that this species is part of this genus.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Talitridae

Loc

Notorchestia

Serejo, C. S. & Lowry, J. K. 2008
2008
Loc

Orchestia J.L. Barnard, 1969: 470

Barnard, J 1969: 470
1969
Loc

Talorchestia

Barnard, J 1969: 472
Stephensen, K 1948: 7
Stebbing, T 1906: 543
Dana, J 1852: 851
1852
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