Styloptocuma aurorae Petrescu 2018, sp. nov.

• Main Author: Petrescu, Iorgu
• Format: Text
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Cumacea; Nannastacidae; Styloptocuma; Styloptocuma aurorae; Lowry; Seta; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.5237182; https://zenodo.org/record/5237182

Styloptocuma aurorae sp. nov. Fig. 56 Holotype subadult ♀, 2.92 mm, P.90707, Australia, NSW, northeast of Coffs Harbour, -30.182° 153.538°, 1000 m, baited trap, 59.2% mud, 40.8% sand, 8–9 Sep 1994, J.K. Lowry, K. Dempsey, SEAS Project, MV Carrie Ann , NSW-999, in AM. Etymology . The species is dedicated to my colleague, Dr Aurora Stănescu, renowned specialist in Heteroptera, Head of Education Department in ”Grigore Antipa” Museum, as a sign of sincere friendship. Diagnosis . Carapace, 0.34 body length; short, upturned, pseudorostrum, 0.36 carapace length; maxilliped 3 carpus 1.2 merus length, propodus 1.33 carpus length; pereopod 2 merus 2.6 ischium length, dactylus 1.66 propodus length, long robust terminal seta; uropod peduncle 2.04 pleonite 6, 1.46 endopod length. Description . Carapace , 0.34 body length, 1.76 as long as high, laterally compressed, 1.71 as long as wide; short, upturned, pseudorostrum 0.36 carapace length; large antennal notch; a few setulae on dorsal margin of carapace, mid-dorsal ridge; ocular lobe without lenses; smooth ventral margin (Fig. 56 A, B). — Antenna 1 peduncle article 1 0.83 rest of article’s length; article 2 as long as the article 3, with process and 2 pedunculate setae; main flagellum 0.8 article 3; accessory flagellum with 1 article; aesthetascs 2 main flagellum length (Fig. 56 C). — Maxilliped 3 basis 0.48 rest of article’s length, with 2 pappose and 2 plumose setae; merus 2 ischium length, with 2 pappose setae; carpus 1.2 merus length, 1 simple and 1 pappose seta; propodus 1.33 carpus length, 3 pappose setae on medial margin, 1 pappose seta on outer margin; dactylus 0.5 propodus length, with terminal seta; with exopod (Fig. 56 D). — Pereopod 1 , basis 0.7 rest of article’s length, with 1 simple seta; merus2 ischium length, with 2 short simple setae; carpus 2 merus length, 2 short simple setae; propodus 0.7 carpus length, 5 simple setae; dactylus 0.6 propodus length, with 6 simple setae; with exopod (Fig. 56 E). — Pereopod 2 basis 0.9 rest of article’s length; merus 2.6 ischium length, with 1 simple seta; carpus 1.69 merus length, with 4 simple setae; dactylus 1.6 propodus length, with 6 setae; with exopod (Fig. 56 F). — Pereopod 3 basis 1.11 rest of article’s length, with 1 simple seta; ischium with 1 simple seta; merus 1.66 ischium length, with 1 plumose seta; carpus 2.6 merus length, with 1 simple seta; propodus 0.46 carpus length, with 1 simple seta; dactylus fused with terminal long robust seta (Fig. 56 G). — Pereopod 4 basis 1.1 rest of article’s length, with 1 simple seta; merus 2 ischium length, with 1 plumose seta; carpus 2 merus length, with 1 simple seta; propodus 0.46 carpus length, with 1 simple seta; dactylus fused with terminal long robust seta (Fig. 56 H). — Pereopod 5 basis 0.6 rest of article’s length, with 1 simple seta; merus 2 ischium length, with 1 simple seta; carpus 1.6 merus length, with 1 simple seta; propodus 0.46 carpus length, with 1 simple seta; dactylus fused with terminal robust seta (Fig. 56 I). — Uropod peduncle 2.04 pleonite 6, 1.5 endopod length, with 7 setae; exopod 0.8 endopod length, with 3 simple setae, terminal robust seta 0.87 exopod length; 5 robust simple setae, 1 simple seta terminally, broken, on serrated medial margin, terminal robust seta 0.46 endopod length (Fig. 56 J). Remarks . Styloptocuma aurorae sp. nov. belongs to a group of Australian species without dorsal spines: S . australiense , S. granulosum and S. nodosum (all described by Petrescu, 2006). The new species has a carapace with a short pseudorostrum as in S. granulosum, but without a serrate ventral margin of carapace and scaly abdomen (characters present in the other two mentioned species); it has a shorter dactylus of pereopod 2 than in others, uropodal peduncle/ endopod ratio 1.46 v. 1.3 or 0.8 in those previously mentioned species or 1.4 in S. angelae sp. nov. Distribution . Australia: NSW—northeast of Coffs Harbour, at 1000 m depth. : Published as part of Petrescu, Iorgu, 2018, On the Family Nannastacidae (Crustacea, Cumacea) from the Australian Museum Collection, pp. 1-111 in Records of the Australian Museum 70 (1) on pages 49-50, DOI: 10.3853/j.2201-4349.70.2018.1645, http://zenodo.org/record/5236860 : {"references": ["Petrescu, I. 2006. Nannastacidae (Crustacea: Cumacea) from eastern Bass Strait, the south-eastern Australian slope, and Antarctica in the collections of Museum Victoria. Memoirs of Museum Victoria 63 (2): 129 - 173. https: // doi. org / 10.24199 / j. mmv. 2006.63.14"]}