Styloptocuma angelae, 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 : 49

Styloptocuma angelae sp. nov.

Fig. 55

Holotype subadult ♂, 2.9 mm, P.90703, Australia, NSW, northeast of Long Reef , -33.7° 151.9°, 466 m, 19 Dec 1985, FRV Kapala , K85-21-06, in AM.

Etymology. The species is named in honour of my beloved, highly devoted wife, Angela, as a sign of eternal love and gratitude for all her care, love and sacrifice she very generously offered to me during our life together.

Diagnosis. Carapace 0.3 body length; with 7 mid-dorsal spines, large on frontal lobe, group of 5 mid-dorsal, 1 posterior; pereonites 3 and 4 with rows of spines, pleonite 5 with short dorsal serration towards posterior end; maxilliped 3 propodus, 2nd longest article, 1.8 dactylus length; pereopod 1 propodus, 2nd longest article, 1.1 carpus length, dactylus 0.5 propodus length; pereopod 2 carpus 2.2 merus length; dactylus 2.5 propodus length; uropodal peduncle 2.2 pleonite 6 length, 1.4 endopod length.

Description. Carapace 0.3 body length, 1.7 as long as high; with 7 mid-dorsal spines, large on frontal lobe, group of 5 mid-dorsal, 1 posterior; pseudorostrum lobes 0.4 carapace length, little upturned, not meeting in front of ocular lobe; long ocular lobe; large antennal notch; anterolateral margin strongly serrated ( Fig. 55 A,B ). — Pereonites 3 and 4 with rows of spines. Pleonite 5 with short dorsal serration towards posterior end. — Antenna 1 peduncle article 1 0.9 rest of article’s length; article 2 with process and 2 pedunculate setae; article 3 tubercle, with 1 pedunculate seta; main flagellum, with 3 articles, 1.8 article; accessory flagellum with 1 article; aesthetascs 2 main flagellum length ( Fig. 55 C ). — Maxilliped 3 basis 0.7 rest of article’s length, with 3 plumose setae; merus 2.5 ischium length, with 1 plumose seta; carpus 1.1 merus length, with 3 plumose setae; propodus 1.3 carpus length, with 1 plumose and 2 pappose setae; dactylus 0.6 propodus length, with 3 simple setae; with exopod ( Fig. 55 D ). — Pereopod 1 basis 0.6 rest of article’s length, with 1 plumose seta; merus as long as ischium, with 1 simple seta; carpus 1.9 merus length, with 2 simple setae; propodus 1.1 carpus length, with 4 setae; dactylus 0.5 propodus length, with 5 simple setae; with exopod ( Fig. 55 E ). — Pereopod 2 basis 0.7 rest of article’s length, with 1 plumose seta; merus 3 ischium length, with 1 simple seta; carpus 1.9 merus length, with 4 simple setae; dactylus 2.5 propodus length, with 4 simple setae; with exopod ( Fig. 55 F ). — Pereopods 3–5 with decreasing basis and increasing carpus length; dactylus fused with long terminal seta ( Fig. 55 G ). — Uropod peduncle 2.2 pleonite 6 length, 1.4 endopod length, with serrate margins; exopod, as long as endopod, with 1 terminal simple seta; endopod with serrate margin medially, 5 simple and 1 terminal seta ( Fig. 55 J ).

Remarks. Styloptocuma angelae sp. nov. is similar to S. poorei Petrescu, 2006 , with a few spines on carapace and a short posterior serration on last pleonite. Styloptocuma angelae mainly differs in: carapace length relative to height (1.7 vs. 1.4), antenna 1 peduncle article 1 relative to rest of articles (0.9 vs. 0.7), pereopod 1 with propodus (1.1 vs. 0.8 in S. poorei and uropod endopod of Styloptocuma angelae with 5 vs. 4 setae medially in S. poorei .

Distribution: Australia: NSW—Long Reef, at 466 m depth.

Figures

Figure 55.Styloptocuma angelae sp. nov. Holotype female (A) body, lateral view; (B) carapace, dorsal view; (C) antenna 1; (D) maxilliped 3; (E) pereopod 1; (F) pereopod 2; (G) pereopod 3; (H) pereopod 4; (I) pereopod 5; (J) uropod. Scales: A 0.5 mm; B 0.3 mm; C,D,F–I 0.2 mm; E,J 0.3 mm.