Scherocumella wittmanni, Petrescu, 2018

Petrescu, Iorgu, 2018, On the Family Nannastacidae (Crustacea, Cumacea) from the Australian Museum Collection, Records of the Australian Museum 70 (1), pp. 1-111 : 41-42

Scherocumella wittmanni sp. nov.

Fig. 46

Holotype ♀, 1.98 mm, P.65091, Australia, QLD, Lizard Island , between bommies inside lagoon entrance, -14.67° 145.47°, 18 m, large hand-held corer on SCUBA, medium to fine sediment, 9 Oct 1978, A. R. Jones, C.J. Short, 2-1-2 | LIZ-2-1-2, in AM.

Etymology. The species name honours Prof. Dr Karl J. Wittmann (University of Vienna), world specialist in Mysidacea, as a sign of my deep gratitude for constant friendship.

Diagnosis. Carapace 0.33 body length, with numerous granules; maxilliped 3 pereopod 1 carpus as long as ischium and merus together; pereopod 2 dactylus 2.2 propodus length, with simple terminal seta; uropodal peduncle 1.1 pleonite 6 length, 1.2 endopod length, 1.4 exopod length, 2 short setae on medial margin.

Description. Carapace 0.33 body length, 1.3 as long as high, with numerous granules; posterior end more elevated, anterolateral margin serrate; antennal notch marked; pseudorostrum 0.5 carapace length; ocular lobe divided ( Fig. 46 A ). — Pereonites and pleonite 1 with short dorsal tubercles. — Antenna 1 peduncle article 1 0.4 rest of article’s length; article 2 1.1 article 3 length, with process and 2 pedunculate setae; main flagellum 0.9 peduncle article 3, accessory flagellum with 1 article; aesthetascs 2.2 main flagellum length ( Fig. 46 B ). — Maxilliped 3 basis as long as rest of article’s length, with 1 plumose seta; merus 7.5 ischium length, with 1 tooth and 2 plumose setae; carpus as long as merus, with 1 plumose and 3 simple setae; propodus 1.3 carpus length, with 1 simple and 2 pappose setae; dactylus 0.4 propodus length, with 2 simple setae; with exopod ( Fig. 46 C ). — Pereopod 1 basis 0.6 rest of article length, with serrate margins and 1 plumose seta; ischium with 1 tooth; merus 2 ischium length, with 1 simple seta; carpus 1.5 merus length, with 4 simple setae; propodus 0.8 carpus length, with 4 simple setae; dactylus 0.4 propodus length, with 3 simple setae; with exopod ( Fig. 46 D ). — Pereopod 2 basis 0.8 rest of article’s length, with hyaline fringe and 2 simple setae; merus 3.25 ischium length, with 1 simple seta; carpus 1.5 merus length, with 2 simple setae; dactylus 2.2 propodus length, with 6 simple setae; with exopod ( Fig. 46 E ). — Pereopods 3–5 with decreasing basis and increasing carpus; dactylus fused with terminal robust curved seta ( Fig. 46 F–H ). — Uropod peduncle 1.1 pleonite 6 length, 1.2 endopod length, with serrate medially margin and 1 terminal robust simple seta; endopod 1.4 exopod length, with hyaline fringe and 3 simple setae ( Fig. 46 I ).

Remarks. Scherocumella wittmanni sp. nov. is most similar with S. sheardi ( Hale, 1945) . Main difference: uropod peduncle/pleonite 6 ratio, 1.1 in S. wittmanni and 1.5 in S. sheardi .

Distribution. Australia: QLD—Lizard Island, at 18 m depth.

Figures

Figure 46. Scherocumella wittmanni sp. nov. Holotype female (A) body, lateral view; (B) antenna 1; (C) maxilliped 3; (D) pereopod 1; (E) pereopod 2; (F) pereopod 3; (G) pereopod 4; (H) pereopod 5; (I) uropod. Scales: A 0.3 mm; B–I 0.2 mm.