Pseudonesimus robustus (J.L. Barnard, 1961 ) Kilgallen & Lowry, 2014

Kilgallen, N. M. & Lowry, J. K., 2014, The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae), Zootaxa 3768 (5), pp. 501-545 : 513-516

publication ID

https://doi.org/ 10.11646/zootaxa.3768.5.1

publication LSID

lsid:zoobank.org:pub:FACF814C-3221-44CF-9DED-4B808F186C64

DOI

https://doi.org/10.5281/zenodo.4909728

persistent identifier

https://treatment.plazi.org/id/03DE241F-FFA2-FFBB-F0A2-FE1B51EBEE3D

treatment provided by

Felipe

scientific name

Pseudonesimus robustus (J.L. Barnard, 1961 )
status

comb. nov.

Pseudonesimus robustus (J.L. Barnard, 1961) comb. nov.

( Figs 6–8 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Ambasiopsis robustus J.L. Barnard, 1961: 30 , fig. 1.

Schisturella robusta .―J.L. Barnard, 1966: 71 (key).― Barnard & Karaman, 1991: 527.― Larsen, 2007: 14 (key).

Schisturella robusta robusta .―J.L. Barnard, 1967: 72 (key).― Barnard & Ingram, 1990: 31 (key).― Barnard & Karaman, 1991: 527.― Hendrycks & Conlan, 2003: 2333 View Cited Treatment , fig. 13.

Types. Holotype, male, 10 mm, ZMUC CRU-1976 .

Type locality. Off Fiordland , South Island, New Zealand (44º18'S 166º46'E), clay, 3580 m depth GoogleMaps .

Material examined. 1 female, 9.0 mm, NMV J46957 View Materials , from off Freycinet Peninsula , Tasmania, Australia (42°0.20'S 148°37.70'E), 720 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al, RV Franklin stn slope 46 GoogleMaps ; 6 specimens, NMV J46958 View Materials , from off Freycinet Peninsula , Tasmania, Australia (42°0.20'S 148°37.70'E), 720 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al., RV Franklin stn slope 46 GoogleMaps ; 4 specimens, NMV J46959 View Materials , from off Freycinet Peninsula , Tasmania, Australia (42°2.20'S 148°38.70'E), 800 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al, RV Franklin stn slope 45 GoogleMaps ; 1 specimen, NMV J46960 View Materials , from off Freycinet Peninsula , Tasmania, Australia (42°2.20'S 148°38.70'E), 800 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al, RV Franklin stn slope 45 GoogleMaps .

Description. Based on female, 9.0 mm, NMV J46957 View Materials . Head lateral cephalic lobe subtriangular, apically subacute; eyes apparently absent. Antenna 1 peduncular article 1 without anterodistal lobe; article 2 without anterodistal lobe; accessory flagellum present, forming cap partially covering callynophore, terminal article not offset; flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short, articles 3 to 5 not enlarged, articles 4–5 with brush setae on the anterior margin; flagellum short, calceoli absent. Epistome/upper lip separate; epistome less produced than upper lip, straight; upper lip produced, rounded apically. Mandible molar with reduced column and convex strongly triturating surface. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, not cuspidate; palp distal margin with apical robust setae. Maxilliped basis without recurved hook; outer plate with 2 long, broad apical robust setae.

Pereonites 1–7 dorsally smooth. Gnathopod 1 slightly chelate; coxa reduced, significantly shorter than coxa 2, subquadrate; basis moderately setose along anterior margin; ischium short; carpus short, subequal in length to propodus, without posterior lobe; propodus small, sparsely setose along posterior margin, slightly obtuse, entire, straight. Gnathopod 2 propodus palm transverse. Pereopod 4 coxa without distinct lateral ridge. Pereopod 5 coxa without distinct lateral ridge, without umbo; basis longer than broad, without photophore, not posteroproximally excavate, posterior margin not serrate, posterior margin without mid-central spine, without posteroventral lobe or spine. Pereopod 7 basis posterodistally produced less than halfway along merus, not posterodistally excavate.

Pleonites 1–3 without mid-dorsal carina, not produced dorsodistally. Epimeron 3 posterior margin smooth, posteroventral corner narrowly rounded. Urosomite 1 n ot projecting over urosomite 2, dorsally straight. Uropod 2 inner ramus with constriction. Uropod 3 stout; peduncle without dorsolateral flange; inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami. Telson moderately cleft, with dorsal robust setae per lobe, with 2 tiny apical robust setae on each lobe.

Sexually dimorphic characters. None known.

Depth range. 720–3580 m (J.L. Barnard 1961; this study).

Remarks. This is the first record of this species in Australian waters. It has previously been recorded from the west coast of the New Zealand South Island.

Distribution. South Pacific Ocean. Tasman Sea: southwest coast of New Zealand (J.L. Barnard 1961); east coast of Tasmania (this study).

ZMUC

Zoological Museum, University of Copenhagen

NMV

Museum Victoria

WHOI

Woods Hole Oceanographic Institution

RV

Collection of Leptospira Strains

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Lysianassidae

Genus

Pseudonesimus

Loc

Pseudonesimus robustus (J.L. Barnard, 1961 )

Kilgallen, N. M. & Lowry, J. K. 2014
2014
Loc

Schisturella robusta robusta

Hendrycks, E. A. & Conlan, K. E. 2003: 2333
Barnard, J. L. & Karaman, G. S. 1991: 527
Barnard, J. L. & Ingram, C. 1990: 31
Barnard, J. L. 1967: 72
1967
Loc

Schisturella robusta

Larsen, K. 2007: 14
Barnard, J. L. & Karaman, G. S. 1991: 527
Barnard, J. L. 1966: 71
1966
Loc

Ambasiopsis robustus J.L. Barnard, 1961: 30

Barnard, J. L. 1961: 30
1961
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