<Unknown Taxon>

Hughes, L. E., 2015, Ampithoidae and Maeridae Amphipods from Timor-Leste (Crustacea: Peracarida), Records of the Australian Museum 67 (3), pp. 83-108 : 102-103

Quadrimaera metinaro sp. nov.

Figs 22–24

Type material. Holotype male, 3.5 mm, dissected, 4 slides, AM P.90577, east of Metinaro, Secret Garden Reef (8°29'15" S 125°49'53" E), 20 m, tufts of red algae, coll. L.E. Hughes, 22 September 2012 ( TM 2012-060); paratype female, 5.0 mm, dissected, 1 slide, AM P.90578, east of Metinaro, Secret Garden Reef (8°29'15" S 125°49'53" E), 20 m, tufts of red algae, coll. L.E. Hughes, 22 September 2012 ( TM 2012-060); paratypes 10 specimens, AM P.90595, east of Metinaro, Secret Garden Reef (8°29'15" S 125°49'53" E), 20 m, tufts of red algae, coll. L.E. Hughes, 22 September 2012 ( TM 2012-060) .

Type locality. East of Metinaro , Secret Garden Reef (8°29'15" S 125°49'53" E) .

Etymology. Named from the type locality, applied as a noun in apposition.

Diagnosis. Gnathopod 2 propodus palm with subacute distal shelf, convex sinus and long rectangular tooth, distal shelf elevation higher than proximal tooth, palm defined by corner with well-developed tooth extending beyond palm margin; dactylus closing along palm with medial bulge. Epimera 1–3 with small acute tooth. Telson lobes distally concave with 4 long robust setae, setae subequal to telson length.

Description. Head lateral cephalic lobe subquadrate, anteroventral corner produced into a sharp cusp, lacking

anteroventral slit. Antenna 1 peduncular article 2 subequal to article 1; accessory flagellum with 7 articles. Antenna 2 gland cone reaching end of short article 3. Mandible palp article 3 longer than article 2.

Pereon. Gnathopod 1 coxa subquadrate; carpus rectolinear, length 1.1 times propodus; propodus subovate, palm convex, defined by rounded corner with one robust seta. Gnathopod 2 basis with anterodistal lobe well developed; ischium anterior margin with well-developed lobes; propodus rectangular with parallel margins, palm with subacute distal shelf, convex sinus and long rectangular tooth, distal shelf elevation higher than proximal tooth, palm defined by corner with well-developed tooth extending beyond palm margin; dactylus closing along palm with medial bulge. Pereopods 3–7 with bifid dactylus. Pereopods 5–7 basis narrow, proximally broader.

Pleon. Epimera 1–3 with small acute tooth. Uropod 3 peduncle 0.9 times rami length; inner ramus 1.1 times outer ramus; rami apically truncate with many long robust setae. Telson deeply cleft (80%), lobes distally concave with 4 long robust setae, setae subequal to telson length.

Female (sexually dimorphic characters). Based on 5.0 mm, AM P.90578.

Gnathopod 2 propodus palm with subacute distal shelf, convex sinus and long rectangular tooth, distal shelf elevation higher than proximal tooth, palm defined by corner with well-developed tooth extending beyond palm margin.

Remarks. Quadrimaera metinaro sp. nov. is similar to Q. serrata (Schellenberg, 1938) and Q. reishi (Barnard, 1970), these species have the gnathopod 2 propodus palm with a concave sinus in mature male specimens. In Q. metinaro

and Q. reishi the telson apical margin lobes have 4 long robust setae, while only 3 setae are present in Q. serrata. In Q. metinaro and Q. reishi the epimeron 3 posterior margin is smooth, whereas it is serrate in Q. serrata.

Quadrimaera metinaro sp. nov. can be separated from Q. reishi by the gnathopod 2 palm margin. The proximal palm margin is raised higher in Q. metinaro than the distal margin, while the opposite is seen in Q. reishi.

Figures

Figure 22. Quadrimaera metinaro sp. nov. male, 3.5 mm, AM P.90577, east of Metinaro, Secret Garden Reef.

Figure 23.Quadrimaera metinaro sp. nov. male, 3.5 mm,AM P.90577; female, 5.0 mm, AM P.90578, east of Metinaro, Secret Garden Reef, scales 0.1 mm.

Figure 24. Quadrimaera metinaro sp. nov. male, 3.5 mm, AM P.90577, east of Metinaro, Secret Garden Reef, scales 0.1 mm.