Prosocratus carolinae, Coleman & Lowry, 2009

Coleman, Charles Oliver & Lowry, James K., 2009, Cheirocratidae *, Zootaxa 2260 (1), pp. 333-338 : 334-337

Prosocratus carolinae sp. nov.

( Figs 1 , 2 )

Type material. Holotype, female, 4.8 mm, AM P75544, largest bommie in lagoon at the ' Entrance' , One Tree Island (23°29.283'S 152°4.773'E) medium fine grain sediment, 4.2 m,, L.E. Hughes & I. Takeuchi, 24 October 2006 (QLD 1935) . Paratype: male, 4.5 mm, AM P78977, same station data. Type locality. “Entrance”, One Tree Island, Queensland, (23°29.283'S 152°4.773'E), 4 m. Etymology. This species is named for Ms Caroline Fenes to thank her for the great work for the art performance “ HUM, the art of collection” in February and March 2008 at the Museum für Naturkunde Berlin. Description. Based on female holotype, 4.8 mm and male allotype, 4.5 mm. Head. Head with rounded anteroventral margin. Eyes round, black pigmented .

Urosomite 1 with 3 transverse teeth; middle tooth, accompanied by a seta on both sides, slightly shorter than lateral teeth; urosomite 2 with a strong seta on both sides. Antenna 1 ratio of peduncular articles = 15:11:4; flagellum slightly longer than peduncle, some articles with slender aesthetasc; accessory flagellum 2- articulate. Antenna 2 longer than 1; peduncular article 2 pointed; article 4 shorter than article 5. Labrum entire. Mandible with 2–dentate incisor, left lacinia mobilis 5–dentate, right lacinia mobilis slender ending in 3 tips; palp article 2 longest with group of setae posteromarginally. Lower lip with inner lobes, outer lobe truncate apically. Maxilla 1 inner lobe distally pointed with a row of setae marginally and an additional row submarginally; outer lobe with 11(?) spine-like setae; palp 2 articulate, surpassing outer plate, 2-article widened apically. Maxilla 2 inner plate with shorter apical setae compared to outer plate and additional row of facial setae. Maxillipeds inner plate subrectangular with 2 medioapical nodular spatulate setae on both sides; outer plate ovoid, nodular setae along medial margin; slender palp 4-articulate, surpassing outer plate, article 2 longest.

Pereon. Pereonites 1–2 combined as long as head; pereonites 1–3 equal in length. Gnathopod 1 (female holotype) coxa expanded anterodistally; basis sinuous posteriorly, with group of long setae posteromarginally; ischium short; merus distally pointed, carpus slightly longer and wider than propodus; dactylus with row of setae on inner margin. Gnathopod 1 (male allotype) coxa to merus similar to female; carpus widened with field of very long slender setae on inner face; propodus about half as long as carpus, palm posteriorly with long projecting teeth; dactylus falcate, twice as long as palm with setae on inner margin. Gnathopod 2 (female holotype) more slender and longer than gnathopod 1, basis posteriorly convex; merus pointed distally; carpus and propodus subequal in length, both with groups of setae, especially posteromarginally; dactylus similar to that of gnathopod 1. Gnathopod 2 (male allotype) coxa to merus similar to that of female; propodus longer with large field of very long slender setae on medial face; dactylus as for female. Pereopods 3 and 4 short, subequal. Pereopod 5 coxa bilobed; basis long, slightly tapering distally; ischium subquadrate; merus weakly expanded distally; merus to propodus subequal in length, but successively narrower; dactylus short. Pereopod 6 coxa posterior lobe shortened; basis to propodus similar to pereopod 5 but longer. Pereopod 7 similar to pereopod 6, but coxa not bilobed and basis to propodus longer.

Pleon. Pleonites 1–3 longest, posteroventral angles pointed. Uropod 1 peduncle as long as rami, with long stout spine-like robust seta distally. Uropod 2 outer ramus shortened. Uropod 3 peduncle widened distally; rami lanceolate. Telson deeply cleft, lobes pointed.

Habitat. Medium fine grain sediment.

Remarks. Prosocratus carolinae sp. nov. is very similar to Prosocratus butcheri Barnard & Drummond, 1982 know from Victoria. The new species differs in the propodus palm projections of male gnathopod 1, which are not present in P. butcheri , and its dense and long setation on the medial face of the carpus.

Distribution. Australia: Queensland: One Tree Island (current study).

Figures

FIGURE 1. Prosocratus carolinae sp. nov., female holotype, 4.8 mm, AM P75544, One Tree Island, Great Barrier Reef.

FIGURE 2. Prosocratus carolinae sp. nov., female holotype, 4.8 mm and male paratype, 4.5 mm, AM P75544, One Tree Island, Great Barrier Reef.