Quadrimaera gregoryi, Hughes, Lauren E., 2015

Hughes, Lauren E., 2015, Maeridae from the Indo-Pacific: Elasmopus, Leeuwinella gen. nov., Maeropsis, Pseudelasmopus and Quadrimaera (Amphipoda: Crustacea), Zootaxa 4059 (2), pp. 201-256 : 232-234

Quadrimaera gregoryi sp. nov.

( Figs 33–35 )

Type material. Holotype male, 5 mm, dissected, 3 slides, AM P.92788, off end of South Mole, Arthur Head, Fremantle, Western Australia, 32°03'S, 115°44'E, 6 m, sponges, 25 December 1983, coll. R.T. Springthorpe, WA 276.

Paratypes: B female, 7.2 mm, dissected, 1 slide, AM P.92789, off end of South Mole, Arthur Head, Fremantle, Western Australia 32°03'S, 115°44'E, 6 m, sponges, 25 December 1983, coll. R.T. Springthorpe WA 276; 19 specimens 10 males, 4 gravid females and 5 juveniles, AM P.79370, off end of South Mole, Arthur Head, Fremantle, Western Australia, 32°03'S, 115°44'E, 6 m, sponges, 25 December 1983, coll. R.T. Springthorpe, WA 276; 25+ specimens, AM P.79308, off end of South Mole, Arthur Head, Fremantle, Western Australia 32°03'S, 115°44'E, 6 m, spirorbid tube worms, 25 December 1983, coll. J.K. Lowry, WA 283.

Additional material examined. 31 specimens (1 male, 5 gravid females and 25 juveniles, AM P.79413, 1 km west of Red Bluff, Kalbarri, Western Australia, 27°42'S, 114°09'E, 18 m, macroalga Ecklonia sp. bed, rocky bottom, Ecklonia sp. holdfasts, 9 January 1984, coll. R.T. Springthorpe, WA 453; 16 specimens, (1 male, 3 gravid females and 12 juveniles), AM P. 79409, inshore limestone reef, Neds Camp, Cape Range National Park, Western Australia, 21°59'S, 113°55'E, 1 m, green/brown algae, 2 January 1984, coll. R.T. Springthorpe, WA 373.

Type locality. South Mole, Arthur Head, Fremantle, Western Australia, 3203'S, 11544'E.

Etymology. Name for the explorers Sir Augustus Charles Gregory and his brother Francis Thomas Gregory, who conducted survey expeditions along the Western Australian coast.

Description. Of holotype male, 5 mm, AM P.92788.

Head. Eyes ovate; lateral cephalic lobe broad, apically truncate, anteroventral margin with excavate, anteroventral corner acute. Antenna 1 longer than antenna 2; peduncular article 1 shorter than article 2, with 3 robust setae on posterior margin; peduncular article 2 longer than article 3; flagellum articles as long as broad, or longer than broad, with 9 articles; accessory flagellum long, more than half length of primary flagellum, with 8 articles. Antenna 2 peduncular article 4 longer in length than article 5; flagellum with 8 articles. Mandible accessory setal row, well developed with 5 setae; palp well developed, article 1 length 1.2 × width, shorter than article 2, inner margin distally produced rounded; article 2 length 0.9 × article 3, lined with long slender setae; article 3 rectilinear, long, 2.8 × as long as broad, longer than article 1, with 5 lateral and 2 apical slender setae. Lower lip inner lobes present; outer lobes without apical ducts, mandibular lobes apically rounded to subacute (not illustrated). Maxilla 1 inner plate with 3 slender setae.

Pereon. Gnathopod 1 coxa anterior margin concave, anteroventral corner produced, acute, ventral margin without robust setae, posteroventral corner without notch; basis anterodistal corner without lobes; ischium anterodistal corner without lobes; merus with posteroventral corner subquadrate; carpus length twice width, 1.2 × propodus length, posterior margin lined with long setae, with rows of setae covering medial surface; propodus subovate, medial surface setal comb absent, palm subacute, weakly convex, entire, lined with slender setae, defined by posterodistal corner with 3 robust setae; dactylus posterior margin lined with setules, closing along palm, unguis present. Gnathopod 2 subchelate; coxa posteroventral corner without notch, ventral margin without robust setae; basis broad, anterodistal corner with pair of well-developed rounded lobes; ischium anterodistal corner with pair of well-developed rounded lobes; merus with acute posteroventral corner; carpus compressed, length 0.7 × width, anterior margin with 2 robust setae, posterior margin a few slender setae; propodus quadrate, length 1.1 × width, anterior and posterior margin with clusters of long slender setae, palm length less than one third of propodus posterior margin, angle transverse, distal shelf subquadrate with 3 pairs of robust setae, palm

Figures

FIGURE 33. Quadrimaera brownorum sp. nov. paratype female 4.5 mm, AM P. 92790, Cygnet Bay, Western Australia, scales 0.1 mm.

FIGURE 34. Quadrimaera gregoryi sp. nov. holotype male, 5 mm, AM P. 92788, off end of South Mole, Arthur Head, Fremantle, Western Australia.

FIGURE 35. Quadrimaera gregoryi sp. nov. holotype male, 5 mm, AM P. 92788, * paratype female, 7.9 mm, AM P. 92789, off end of South Mole, Arthur Head, Fremantle, Western Australia, scales 0.1 mm.