Pseudoarchaeocuma bacescui, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 170-173

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.

Figures

FIGURE 68. Pseudoarchaeocuma bacescui n. sp. Holotype ovigerous female NMV J62283, A, side view; B, dorsal view; C, antennule; D, antenna; E, mandible; F, maxillule; G, maxilla; H, maxilliped 1; I, maxilliped 2. Scale bars full body 1.0 mm, all others 0.1 mm.

FIGURE 69. Pseudoarchaeocum bacescui n. sp. Holotype ovigerous female NMV J62283, A, maxilliped 3; B, pereopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, telson and uropods. Scale bars 0.1 mm.