Pseudoarchaeocuma bacescui n. sp.

(Figs 68–69)

Type material. Holotype: ovigerous female, dissected, NMV J62283, 38 °16’24”– 38°17’42”S, 149°26’6”– 149°27’36”E, 800 m.

Diagnosis. Carapace with branchial swellings, pseudorostrum excavate in dorsal view.

Description. Holotype ovigerous female, NMV J62283.

Ovigerous female, 4.8 mm. Carapace flattened, marginal carina present, paired dorsolateral expansion; pseudorostral lobes 0.3 carapace length, anterior margin concave from dorsal view; eyelobe 0.4 carapace length; carapace 1.9 length of pereonites together (Fig. 68A, B).

Antennule peduncle article 1equal to article 2 length, with pappose seta; article 2 unarmed; article 3 0.5 article 2 length, unarmed; flagella broken, at least 2.0 article 3 length (Fig. C68).

Antenna of 4 articles; article 1 with pappose seta; article 2 with 2 pappose setae; article 3 unarmed; article 4 with 3 small simple setae terminally (Fig. 68D).

Mandible navicular, with 11 simple setae medially (Fig. 68E).

Maxillule with 2 endites; outer endite with 12 simple setae; inner endite with 4 simple and 1 dentate setae; palp with 2 setae (Fig. 68F).

Maxilla with 3 endites; broad endite distal margin with simple and pappose setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 6 microserrate setae terminally; both narrow endites not extending to distal margin of broad endite (Fig. 68G).

Maxilliped 1 basis produced medially as broad lobe, distal margin with 5 simple setae, 2 hook setae medially, row of 5 pappose setae mid–lobe; ischium absent; merus with pappose seta laterally; carpus 2.1 merus length, with 8 simple and 7 comb setae medially, pappose seta laterally; propodus 0.5 carpus length, with 3 simple and 1 pappose setae medially; dactylus 0.6 propodus length, with 3 simple setae terminally (Fig. 68H).

Maxilliped 2 basis 0.9 all other articles together, with 5 plumose setae; ischium 0.05 basis length, unarmed; merus 5.0 ischium length, with pappose seta medially, plumose seta laterally; carpus 1.3 merus length, with 3 plumose setae medially, plumose seta laterally; propodus 1.0 carpus length, with 2 plumose setae medially, plumose seta laterally; dactylus 0.3 propodus length, with 3 simple setae terminally (Fig. 68I).

Maxilliped 3 basis 1.2 all other articles together, with 7 pappose setae medially, 3 plumose setae at distolateral corner; ischium 0.01 basis length, with plumose seta; merus 10.0 ischium length, with pappose seta medially, 2 plumose setae laterally; carpus 2.3 merus length, with 7 plumose setae medially, 2 plumose setae laterally; propodus 0.7 carpus length, with 5 plumose setae medially, 3 plumose setae laterally; dactylus 0.5 propodus length, with 3 simple setae terminally; exopod 0.9 basis length, basal article unarmed, flagellum with plumo-annulate setae (Fig. 69A).

Pereopod 1 broken, not illustrated.

Pereopod 2 basis equal to all other articles together, with 10 pappose setae; ischium 0.07 basis length, with pappose seta; merus 2.6 ischium length, with pappose seta; carpus 0.7 merus length, with 1 simple and 1 pappose setae; propodus 1.3 carpus length, with simple seta; dactylus 0.5 propodus length, with 4 simple setae terminally; exopod 0.8 basis length, basal article with 4 pappose setae, flagellum with plumo-annulate setae (Fig. 69B).

Pereopod 3 basis 2.5 all other articles together, with 15 plumose setae; ischium 0.06 basis length, with 2 simple setae; merus 1.8 ischium length, unarmed; carpus equal to merus length, with 1 simple and 2 annulate setae; propodus 0.7 carpus length, with 1 simple and 1 annulate setae; dactylus 0.5 propodus length, with 2 simple setae terminally; exopod rudimentary, 0.1 basis length, of 2 articles with 5 simple setae (Fig. 69C).

Pereopod 4 basis 2.0 all other articles together, with 3 simple and 10 plumose setae; ischium 0.04 basis length, with 2 simple setae; merus 3.7 ischium length, with simple seta; carpus 0.8 merus length, with 2 simple and 2 annulate setae; propodus 0.9 carpus length, with annulate seta; dactylus 0.5 propodus length, with 3 simple setae terminally; exopod rudimentary, 0.1 basis length, of 2 articles with 1 simple and 3 plumose setae (Fig. 69D).

Pereopod 5 basis equal to all other articles together, with 1 simple and 3 plumose setae; ischium 0.2 basis length, with 2 simple setae; merus 1.3 ischium length, with 2 simple setae; carpus 1.1 merus length, with 1 simple and 2 annulate setae; propodus 0.8 carpus length, with annulate seta; dactylus 0.6 propodus length, with 3 simple setae terminally (Fig. 69E).

Telson 2.0 length of pleonite 6, with 5 pairs microserrate lateral setae, 3 microserrate terminal setae (Fig. 69F).

Uropod peduncles 2.3 pleonite 6 length, 1.1 telson length, with 11 microserrate setae medially. Uropod endopod of 3 articles, 1.0 peduncle length; article 1 1.3 articles 2 and 3 together, with 15 microserrate setae with single subterminal setule medially; article 2 0.4 article 1 length, with 4 microserrate setae with single subterminal setule medially; article 3 equal to article 2 length, with 2 microserrate setae with single subterminal setule medially, seta with single subterminal setule laterally, terminal microserrate seta with single subterminal setule, 0.8 article 3 length. Uropod exopod 0.8 length of endopod; article 1 0.3 article 2 length, unarmed; article 2 3.0 length article 1, with 7 setae with single subterminal setule medially, seta with single subterminal setule laterally, terminal seta with single subterminal setule, 0.8 article 2 length (Fig. 69F).

Pleopod 1 of 2 segments, with short setae (Fig. 68A).

Pleopod 2 of 2 segments, with short setae (Fig. 68A).

Etymology. The new species is named in honor of Mihai Băcescu, who described the genus Archaeocuma, the first cumacean genus with pleopods in the female.

Depth. 800 m.

Distribution. Southeastern Australia, 38°S, 149°E.

Remarks. This species is distinctive in the female possessing two pairs of pleopods.