Paralysianopsis dandenong Lowry & Kilgallen 2014
- Dataset
- New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae)
- Rank
- SPECIES
- Published in
- Lowry, J. K., Kilgallen, N. M. (2014): New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae). Zootaxa 3844 (1): 1-64, DOI: 10.11646/zootaxa.3844.1.1
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Amphipoda
- family
- Tryphosidae
- genus
- Paralysianopsis
- species
- Paralysianopsis dandenong
description
(Figs 20 – 22) Types. Holotype, female, 2.2 mm, AM P. 70314, off Moona Moona Creek, Jervis Bay, New South Wales, Australia (35 º 3.5 ’ S 150 º 40.8 ’ E), 4.6 m, kelp holdfasts, hand collected on SCUBA, 15 August 1981, coll. P. B. Berents. Paratypes: 2 males, 2.4 – 3.2 mm, AM P. 70315, same collection details as holotype; 1 male, 2.3 mm, AM P. 70316, off mouth of Moona Moona Creek, Jervis Bay, New South Wales, Australia (35 º 2.9 ’ S 150 º 40.8 ’ E), 4 m, Ecklonia holdfast, hand collected on scuba, September 1981 coll. P. B. Berents.
description
Description. Based on female, 2.2 mm, AM P. 70314. Head lateral cephalic lobe rounded; eyes oval. Antenna 1 accessory flagellum not forming operculum; primary flagellum with weak 2 - field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae absent; flagellum short, calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, straight; upper lip weakly produced, slightly subacute apically. Mandible molar a reduced column with reduced triturating surface. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with apical robust setae absent. Pereonites 1 – 7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis sparsely setose along anterior margin; ischium short; carpus short, subequal in length to propodus, without posterior lobe; propodus small, sparsely setose along posterior margin, palm moderately acute, entire, straight. Gnathopod 2 propodus palm moderately obtuse, with minutely serrate pad on posterior corner. Pereopod 5 basis about as long as broad, not posteroproximally excavate, posterior margin weakly or not 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 narrowly rounded. Urosomite 1 with slight notch. Uropod 2 inner ramus with constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 long, without plumose setae on rami. Telson entire, longer than wide, apically rounded, without dorsal robust setae, with 1 subapical robust seta on each apical corner. Sexually dimorphic characters. Based on male, 2.3 mm, AM P. 70316. Antenna 1 primary flagellum with strong 2 - field callynophore.
discussion
Remarks. Paralysianopsis dandenong sp. nov. is very similar to P. padoz Lowry & Stoddart, 1995 b. The distinguishing characters of these taxa are antenna 1 flagellum article 1, which is shorter than the remaining articles combined in P. dandenong (longer than the remaining articles combined in P. padoz); antenna 2 without brush setae (brush setae present in P. padoz); and the telson, which is apically rounded in P. dandenong (apically truncated in P. padoz). Depth range. 4 – 4.6 m.
distribution
Distribution. Australia. Recorded only from Jervis Bay, New South Wales.
etymology
Etymology. Named for the steamer Dandenong, sunk off Jervis Bay in September 1876; used as a noun in apposition.
materials_examined
Type locality. Off Moona Moona Creek, Jervis Bay, New South Wales, Australia; 4.6 m depth.