Gippsia jonesae, Lowry & Stoddart, 1995

Lowry, J. K. & Stoddart, H. E., 1995, New lysianassoid genera and species from south-eastern Australia (Crustacea: Amphipoda), Records of the Australian Museum 47 (1), pp. 7-25 : 21-24

Gippsia jonesae n.sp.

Figs 10 , 11

Type material. HOLOTYPE, female, 3.0 mm (ovigerous, 1 egg), NMV J22344 and PARATYPE, female, NMV 122345: 15.3 km east-south-east of eastern edge of Lake Tyers , Victoria, Australia, 37°53.39'S 148°15.40'E, Smith-McIntyre grab, coarse sand, 43 m, N. Coleman, 4 June 1991, stn MSL-EG 70 . PARATYPE, male, 2.0 mm, NMV 122346, 15.5 km southeast of Point Ricardo , Victoria, Australia, 37"53.14'S 148°28.94'E, Smith-McIntyre grab, medium sand, 45 m, N. Coleman, 4 June 1991, stn MSL-EG 81 . PARATYPE, NMV J26744 , 7.3 km south-south-west of Cape Conran , Eastern Bass Strait, Victoria, Australia, 37°52.65'S 148°42.15'E, Smith-McIntyre grab, coarse sand, 49 m, N. Coleman, February 1991, stn MSL-EG 117 . PARATYPES, 1 female, 3.0 mm, 1 male, AM P42289, 15.3 km east-south-east of eastern edge of Lake Tyler , Eastern Bass Strait, Victoria, Australia, 37°53.39'S 148°15.40'E, Smith-McIntyre grab, coarse sand, 43 m, N. Coleman, February 1991, stn MSL-EG 97 . PARATYPE, NMV J26747 , 15.3 km east-south-east of eastern edge of Lake Tyler , Eastern Bass Strait, Victoria, Australia, 37°53.39'S 148°15.40'E, Smith-McIntyre grab, coarse sand, 43 m, N. Coleman, February 1991, stn MSL-EG 98 .

Description. Holotype female, 3.0 mm, paratype male, 2.0 mm. Head and body: without setae. Head: deeper than long, lateral cephalic lobe large, broad, subacute; rostrum absent; eyes indistinct, irregularly reniform, colour unknown, not enlarged in adult male. Antenna 1: medium length; peduncular article 1 short, length 1.1 x breadth; peduncular article 2 short, 0.34 x article 1; peduncular article 3 short, 0.05 x article 1; accessory flagellum long, 0.51 x primary flagellum, 3-articulate, article 1 long, 1.2 x article 2 (male long, 2.1 x article 2), not forming cap; flagellum 7-articulate (male 6), with strong I-field callynophore in female (strong 2-field callynophore in male), without flagellar robust setae, calceoli absent in female and male. Antenna 2: subequal in length to antenna 1 in female and male; peduncle without brush setae in female and male, weakly geniculate between peduncular articles 3-4, article 3 short, 0.48 x article 4 (male weakly geniculate between peduncular articles 3--4, article 3 short, 0.25 x article 4), peduncular articles 4 and 5 not enlarged in female or male; flagellum 6-articulate (male 5), calceoli absent in female and male.

Mouthpart bundle: subquadrate. Epistome and upper lip: fused, bilobate. Mandible: incisors symmetrical, large, with slightly convex margins; lacinia mobilis a cuspidate peg; accessory setal row, left row with 3, right row with 4 short, slender, serrate setae; intermediate setae absent; molar setose with rudimentary distal triturating surface; mandibular palp attached distally; article.1 short, length 1 x breadth; article 2 slender, length 4.3 x breadth, 1.6 x article 3, with 3 distal A2- setae (male 3), without D2-setae; article 3 slender, bladelike, long, length 3.1 x breadth, without A3-setae, with 1 distal D3-seta (male 1) and 3 apical E3-setae. Maxilla 1: inner plate narrow, with 2 pappose setae; outer plate extremely narrow with 11 setal-teeth in 7/4 crown arrangement, STl to ST3 large, slender, multicuspidate, ST4 large, slender, 8-cuspidate, ST5 large, slender, 9- cuspidate, ST6 large, slender, 14-cuspidate, ST7 displaced down medial face, large, slender, 27-cuspidate medially, STA large, slender, displaced from STB, multicuspidate, STB long, slender, 7-cuspidate, STC long, slender, 6-cuspidate, STD long, slender, 6-cuspidate; palp large, 2-articulate, with 3 short terminal conate setae, with 1 subterminal seta, robust flag seta present on distolateral corner, distomedial margin serrate. Maxilla 2: inner plate narrow, outer plate broader, inner plate length 1.3 x outer plate, outer plate with extremely elongate slender setae. Maxilliped: inner plate large, subrectangular, with 2 apical nodular setae, oblique setal row strong with 5 pappose setae; outer plate medium size, subovate, without apical slender setae, with 1 apical robust seta, medial setae small, blunt, submarginal setae long, simple; palp large, 4-articulate, article 2 very broad, length 1.8 x breadth, 1.2 x article 3, article 3 long, broad, length 2.2 x breadth, dactylus well-developed, with 2 subterminal setae, unguis present.

Gnathopod 1: simple; coxa large, about as long as coxa 2, anterior margin slightly concave, anteroventral corner rounded, posterior margin straight; basis long, slender, length 2.9 x breadth, anterior margin smooth, with simple setae; ischium short, length 1.4 x breadth; merus, posterior margin with patch of short setae; carpus subrectangular, short, length 1.9 x breadth, longer than (1.1 x) propodus, with patch of very fine setae near posterior margin; propodus large, subrectangular, length 2.1 x breadth, margins slightly converging distally, posterior margin smooth, straight, with 1 simple robust seta; dactylus simple, with subterminal spine. Gnathopod 2: minutely subchelate; coxa large, subequal in size to coxa 3; ischium long, length 3 x breadth; carpus long, length 2.8 x breadth, posterior margin straight; propodus subquadrate, short, length 1.5 x breadth, palm transverse, with straight, serrate margin, posterodistal corner with 1 (male 1) medial robust seta; dactylus reaching corner of palm, posterior margin smooth proximally with serrate tip.

Peraeopod 3: coxa large; merus weakly expanded anteriorly; merus-carpus without plumose setae in male and female; propodus with 2 slender setae along posterior margin, with 1 distal locking seta; dactylus short, slender. Peraeopod 4: coxa deeper than wide, with large posteroventral lobe, anterior margin slightly rounded, posterior margin slightly sloping anteriorly; merus weakly expanded anteriorly; merus-carpus without plumose setae in male and female; propodus with 2 slender setae along posterior margin, with 1 distal locking seta; dactylus short, slender. Peraeopod 5: coxa equilobate; basis expanded with posterior margin minutely crenate; merus expanded with rounded posterior margin; propodus with finely setose anterior margin, with 2 robust setae along anterior margin, with 2 distal locking setae; dactylus short, slender. Peraeopod 6: coxa small, slightly lobate posteriorly; basis expanded posteriorly with minutely crenate posterior margin; merus not expanded posteriorly; propodus with finely setose anterior margin, with 2 robust setae along anterior margin, with 2 distal locking setae; dactylus short, slender. Peraeopod 7: basis expanded posteriorly, posterior margin slightly rounded, crenate, posteroventral corner rounded, posteroventral margin rounded; merus not expanded posteriorly, with 2 robust setae; propodus with finely setose anterior margin, with 2 robust setae along anterior margin, 2 distal locking setae, without setae along posterior margin; dactylus short, slender.

Oostegites: from gnathopod 2 to peraeopod 5. Gills: from gnathopod 2 to peraeopod 6, not pleated.

Pleonites 1 to 3 dorsally smooth. Epimeron 1: anteroventral corner rounded. Epimeron 3: posteroventral corner produced, with minute bicuspidate notch. Urosomites: dorsally smooth; urosomite 3 with small dorsolateral seta. Uropod 1: without fine setae; peduncle with 1 dorsolateral, 1 apicolateral, 3 dorsomedial and 1 apicomedial robust setae; rami subequal in length; outer ramus with 2 dorsal robust setae, inner ramus with 2 dorsal robust setae. Uropod 2: without fine setae; peduncle with 1 apicolateral and 1 apicomedial robust setae; rami subequal in length; outer ramus with 1 dorsal robust seta, inner ramus with 2 dorsal robust setae; inner ramus without constriction. Uropod 3: peduncle short, length 1.4 x breadth, without dorsolateral flange, with 1 apicomedial robust seta, without midlateral slender or robust setae, with 1 distoventral robust seta, without plumose setae in female or male; rami lanceolate, inner ramus shorter than (0.79x) outer ramus; outer ramus 2-articulate, article 2 long, article 1 with 1 lateral robust seta; inner ramus without robust setae; slender plumose setae absent in female and male. Telson : shorter than broad, length 0.75 x breadth, entire, without dorsal robust setae, without dorsal slender setae, distal margin rounded, with 2 marginal penicillate setae, without marginal simple setae, with 2 marginal robust setae.

Etymology. Named for Diana Jones, carcinologist at the Western Australian Museum, for her contribution to the systematics of Australian crabs and barnacles.

Remarks. For reasons put forward in the remarks under Galathella it is highly probable that Gippsia jonesae is a demersal scavenger and/or micropredator.

Distribution. Gippsia jonesae is known from off the central Victorian coast, Australia, in 40 to 50 m depth.

ACKNOWLEDGMENTS. We are particularly grateful to Gary Poore, who supplied the material for this study; to Stephen Keable, who made all of the illustrations; and to Roger Springthorpe, who composed and inked the plates. Financial support for the project was provided by the Australian Research Council.

Figures

Fig. 10. Gippsia jonesae n.gen., n.sp., holotype female, 3.0 mm, NMV 122344; paratype male, 2.0 mm, NMV 122346; off Gippsland, Victoria, Australia. Scale for H+E represents 0.2 mm, remainder TODO TODO TODO

Fig. 11. Gippsia jonesae n.gen., n.sp., holotype female, 3.0 mm, NMV 122344; * paratype female, 3.0 mm, AM P42289; off Gippsland, Victoria, Australia. Scales represent 0.1 mm.