Vallorchestia dispar ( Dana, 1852 )

Lowry, J. K., 2012, Talitrid amphipods from ocean beaches along the New South Wales coast of Australia (Amphipoda, Talitridae), Zootaxa 3575, pp. 1-26: 20-25

publication ID

http://doi.org/10.5281/zenodo.5259030

publication LSID

lsid:zoobank.org:pub:8E0532A2-2BA1-41E1-8BAD-5ED0640C6691

DOI

http://doi.org/10.5281/zenodo.5259030

persistent identifier

http://treatment.plazi.org/id/F45BB122-CF58-CD09-0689-F982B1A2B5A0

treatment provided by

Felipe

scientific name

Vallorchestia dispar ( Dana, 1852 )
status

 

Vallorchestia dispar ( Dana, 1852)  

( Figs 11–14)

Orchestia dispar Dana, 1852: 204   .— Dana, 1853: 878, pl. 59, fig. 6a–m.— Lowry & Stoddart, 2003: 272.— Lowry & Springthorpe, 2009: 902.

Orchestia gammarellus   .— Stebbing, 1906: 532 (in part).

Types. Neotype, male, 14 mm, AM P.85737, north of lagoon, Valla Beach , New South Wales, Australia (30°35'S 153°00'E), under leaves and debris, J. Peart & R. Peart, 10 January 2002. Original types lost according to Springthorpe & Lowry 1994. GoogleMaps  

Additional material examined. 1 female, AM P.87938, same data as neotype GoogleMaps   ; 10 specimens, AM P.85736, Valla Park Beach , north of Nambucca Heads, New South Wales (30°35'S 153°00'E), under Zostera   , supralittoral, western shore of the lagoon, near mouth, S. Keable & D. Townsend GoogleMaps   ; 1 specimen, AM P.85730, north of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), damp sand, J. Peart & R. Peart, 10 January 2002 GoogleMaps   ; 1 specimen, AM P.85731, north of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), damp sand, J. Peart & R. Peart, 10 January 2002 GoogleMaps   ; 15 specimens, AM P.85732, north of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), damp sand, J. Peart & R. Peart, 10 January 2002 GoogleMaps   ; 1 specimen, AM P.85734, north of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), under leaves and detritus, J. Peart & R. Peart, 10 January 2002 GoogleMaps   ; 22 specimens, AM P.85735, north of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), under leaves and detritus, J. Peart & R. Peart, 10 January 2002 GoogleMaps   ; 15 specimens, AM P.85741, western shore of lagoon, Valla Beach , New South Wales, Australia (30°35’S 153°00’E), under littoral Zostera   wrack, S. Keable & D. Townsend GoogleMaps   ; 9 males, many females (3 are ovigerous) and juveniles, AM P.87936, Macleay River estuary at Stuarts Point Reserve, New South Wales, Australia (30.82209°S 152.99393°E), supralittoral, flat beach, talitrids living in heavy Zostera   debris in estuary inland from beach, J.K. Lowry, J. Dermand & K. Engelberg, 11 February 2010 ( MI NSW 3666) GoogleMaps   ; 8 specimens, AM P.85742, UNSW field station, Smiths Lake , New South Wales, Australia (32°35'S 152°29'E), sandy shore, under drift seaweed on sand, A. Poore, 30 September 2003 GoogleMaps   .

Type locality. Valla Beach , New South Wales, Australia (30°35’S 153°00’E) GoogleMaps   .

Description. Based on neotype male, 14 mm, AM P.85737.

Head. Eye medium (1/5–1/3 head length). Antenna 1 short, rarely longer than article 4 of antenna 2 peduncle. Antenna 2 up to half body length; peduncular articles slightly expanded. Mandible left lacinia mobilis 4-dentate. Maxilliped palp article 2 distomedial lobe well developed, 4 reduced, button-shaped.

Pereon. Gnathopod 1 subchelate; coxa smaller than coxa 2, subtriangular, about as broad as deep; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus subtriangular with well developed posterodistal lobe; palm transverse; dactylus shorter than palm. Gnathopod 2 subchelate; coxa similar in size to coxa 3, broader than deep; coxal gill simple (or slightly lobate); basis slightly expanded; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; carpus triangular, reduced (enclosed by merus and propodus), posterior lobe absent, not projecting between merus and propodus; palm acute, smooth, posterodistal corner with groove; dactylus longer than palm, attenuated distally; gill simple, gill not incised. Pereopods 2–4 coxae wider than deep. Pereopods 3–5 gills simple; subequal in size to gills 2 and 6. Pereopods 3–7 cuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus significantly shorter than carpus of pereopod 3; dactylus thickened and pinched posteriorly (different to pereopod 3 dactylus). Pereopod 5 propodus distinctly longer than carpus. Pereopods 6–7 medial surface of merus and carpus with velcro setae. Pereopod 6 subequal in length to pereopod 7; posterior lobe inner view posteroventral corner subquadrate, posterior lobe with 5 or more marginal setae; coxal gill simple, coxal not incised; merus and carpus with T-setae. Pereopod 7 sexually dimorphic; posterodistal lobe present, shallow, broadly rounded; distal articles (merus and carpus) expanded; merus posterior margin evenly rounded; carpus subovate.

Pleon. Pleopods all well developed. Pleopod 1 peduncle with marginal robust setae; biramous, outer ramus subequal in length to peduncle; inner ramus with 11 articles; outer ramus with 12 articles. Pleopod 2 biramous, outer ramus subequal in length to peduncle; inner ramus with 11 articles; outer ramus with 14 articles. Pleopod 3 biramous, outer ramus subequal in length to peduncle; inner ramus with 10 articles; outer ramus with 12 articles. Epimeron 2 subequal in length to epimeron 3. Epimeron 3 posterior margin smooth, posteroventral corner with small subacute tooth, ventral margin without robust setae. Uropod 1 not sexually dimorphic, peduncle with more than 6 robust setae, peduncle with 14 robust setae, distolateral robust seta present; inner ramus subequal in length to outer ramus, with 4 marginal robust setae; outer ramus without marginal robust setae. Uropod 2 not sexually dimorphic; peduncle with 5 robust setae; inner ramus subequal in length to outer ramus, with 3 marginal robust setae; outer ramus with 2 marginal robust setae. Uropod 3 peduncle with 3 robust setae; ramus shorter than peduncle, ramus linear (narrowing), ramus with 6 marginal robust setae. Telson longer than broad, apically incised, dorsal midline entire, with marginal and apical robust setae, telson with 8 or 9 robust setae.

Female (sexually dimorphic characters). Based on female, 9 mm in length, AM P.87938. Gnathopod 1 parachelate; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; propodus subrectangular; palm acute; dactylus longer than palm. Gnathopod 2 mitten-shaped; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; carpus well developed (not enclosed by merus and propodus), posterior lobe present, projecting between merus and propodus; palm obtuse; dactylus shorter than palm. Pereopods 6 medial surface of merus and carpus without T-setae. Pereopod 7 distal articles (merus and carpus) slender. Oostegites long (length greater than 2 × width), weakly setose or setae absent, setae with simple smooth tips. Uropod 3 peduncle with 3 robust setae; ramus with 5 marginal robust setae.

Remarks. A neotype is established for this material to stabilise this long lost species of Dana 1852.

Distribution. New South Wales: shores of Illawarra ( Dana 1852); Valla Beach (current study); Macleay River (current study); Smiths Lake (current study).

AM

Australian Museum

R

Departamento de Geologia, Universidad de Chile

MI

Università degli Studi di Milano

UNSW

John T. Waterhouse Herbarium

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Talitridae

Genus

Vallorchestia

Loc

Vallorchestia dispar ( Dana, 1852 )

Lowry, J. K. 2012
2012
Loc

Orchestia gammarellus

Stebbing, T. R. R. 1906: 532
1906
Loc

Orchestia dispar

Lowry, J. K. & Springthorpe, R. T. 2009: 902
Lowry, J. K. & Stoddart, H. E. 2003: 272
Dana, J. D. 1853: 878
Dana, J. D. 1852: 204
1852