Microlysias soela, Lowry & Kilgallen, 2014

Lowry, J. K. & Kilgallen, N. M., 2014, New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae), Zootaxa 3844 (1), pp. 1-64 : 19-22

publication ID

https://doi.org/ 10.11646/zootaxa.3844.1.1

publication LSID

lsid:zoobank.org:pub:10B3C1CE-6279-4B4C-8139-C5D3EDB24255

DOI

https://doi.org/10.5281/zenodo.5116768

persistent identifier

https://treatment.plazi.org/id/3462395F-AB16-FF93-6688-FE52F913F929

treatment provided by

Felipe

scientific name

Microlysias soela
status

sp. nov.

Microlysias soela View in CoL sp. nov.

( Figs 13–15 View FIGURE 13 View FIGURE 14 View FIGURE 15 )

Microlysias xenokeras View in CoL .— Azman & Othman, 2013: 14 View Cited Treatment , fig. 9.

Types. Holotype female 5.5 mm, AM P.68958, North West Shelf, Western Australia, (19°58.4’S 117°49.2’E), 43 m, sled, 26 June 1983, CSIRO Division of Fisheries, FRV Soela stn 03-D4-S GoogleMaps . Paratypes: 33 specimens, 3.2–5.6 mm, AM P.68959, with same collection details as holotype ; 2 specimens, AM P.68960, North West Shelf , Western Australia, Australia (19°59.2’S 117°48.6’E), 41 m, sled, 26 June 1983, CSIRO Division of Fisheries, FRV Soela stn 03-D8-S GoogleMaps ; 1 male, 6.0 mm, NMV J67527 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (20°01.00’S 117°11.00’E – 20°01.00’S 117°12.00’E), 48 m, WHOI epibenthic sled, 11 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [stn NWA-48] GoogleMaps .

Additional material examined. 1 male, NMV J67528 View Materials North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (20°01.00’S 117°11.00’E –20°01.00’S 117°12.00’E), 48 m, WHOI epibenthic sled, 11 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [stn NWA-48] GoogleMaps ; 23 specimens, NMV J67529 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (20°01.00’S 117°11.00’E –20°01.00’S 117°12.00’E), 48 m, WHOI epibenthic sled, 11 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [stn NWA-48] GoogleMaps ; 1 female, NMV J67530 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (20°01.00’S 117°11.00’E –20°01.00’S 117°12.00’E), 48 m, WHOI epibenthic sled, 11 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [stn NWA-48] GoogleMaps ; 1 specimen, NMV J67531 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (19°38’S 118°06’E –19°37’S 118°05’E), 49 m, crinoids, WHOI epibenthic sled, 13 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [stn NWA-56] GoogleMaps ; 1 specimen, NMV J67532 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (19°00.5’S 117°26.0’E –19°00.5’S 117°46.23’E), 120 m, WHOI epibenthic sled, 12 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [NWA-52] GoogleMaps ; 1 specimen, NMV J67533 View Materials , North-West Shelf between Port Hedland and Dampier, Western Australia, Australia (20°01.00’S 117°17.00’E –20°00.00’S 117°18.00’E), 46 m, WHOI epibenthic sled, 2 June 1983, G.C.B. Poore & H.M. Lew Ton, FRV Soela [NWA-5] GoogleMaps .

Type locality. North West Shelf , Western Australia, Australia (19°58.4’S 117°49.2’E) GoogleMaps ; 43 m depth.

Etymology. Named for the FRV Soela; used as a noun in apposition.

Description. Based on holotype female, 5.5 mm, AM P.68958. Head lateral cephalic lobe subtriangular, apically subacute; eyes irregularly subrectangular, covering most of head. Antenna 1 accessory flagellum forming a partial operculum, 3-articulate; primary 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; flagellum short, calceoli absent. Labrum, epistome and upper lip fused, broadly rounded, concave. Mandible molar ridge-like, narrow, setose with narrow distal triturating surface; palp attached about midway, article 3 with 1 proximal A3-setae. Maxilla 1 inner plate apically produced into a slender spine; outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with 1 short apical robust seta.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular, with concave anterior margin, distally straight; basis moderately setose along anterior margin; ischium short; carpus compressed, shorter than propodus, with narrow posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm transverse, entire, straight. Gnathopod 2 minutely chelate; propodus palm moderately obtuse. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 basis slightly broader than long, not posteroproximally excavate, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced less than halfway along merus.

Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner broadly rounded. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 2 inner ramus without constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 short, with plumose setae on both rami. Telson deeply cleft, longer than wide, with 2–3 dorsal robust setae per lobe and 1 apical robust setae on each lobe.

Sexually dimorphic characters. Based on male, 6.0 mm, NMV J67527 View Materials . Antenna 1 primary flagellum with strong 2-field callynophore (stronger than female); calceoli present, small. Antenna 2 peduncular article 3 short; article 5 greatly enlarged; flagellum long, calceoli present.

Remarks. The only other recognised species of Microlysias , M. xenokeras Stebbing, 1918 , is known from south-western South Africa. A second species, M. indica K.H. Barnard, 1937 , from the south Arabian coast is considered by Griffiths (1975) to be a synonym of M. xenokeras .

Microlysias soela sp. nov. is very similar to M. xenokeras . The gnathopod 2 palm in M. xenokeras is extremely obtuse (almost at a right angle), but only moderately obtuse in M. soela and the antenna 2 peduncle article 3 is longer in the female of M. xenokeras . Microlysias soela also has a distinct spine-like projection from the apical margin of the maxilla 1 inner plate that is absent in M. xenokeras .

Based on the less obtuse palm of gnathopod 2 the record of M. xenokeras from Pulau Tioman ( Azman & Othman 2013) appears to be M. soela .

Depth range. 41–120 m (this study).

Distribution. Australia. North West Shelf, Western Australia (this study). Malaysia. Pulau Tioman ( Azman & Othman 2013).

AM

Australian Museum

CSIRO

Australian National Fish Collection

NMV

Museum Victoria

WHOI

Woods Hole Oceanographic Institution

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Tryphosidae

Genus

Microlysias

Loc

Microlysias soela

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

Microlysias xenokeras

Azman, B. A. R. & Othman, B. H. R. 2013: 14
2013
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