Schizotrema radui, 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 : 46-47

Schizotrema radui sp. nov.

Fig. 52

Holotype ♂, 2.5 mm, P.64591, Australia, WA, Cape Range National Park , inshore limestone patches near Neds Camp, -21.98° 113.91°, 0–1 m, brown algae with epiphytic algae, sediment, 31 Dec 1983, H.E. Stoddart, WA-311, in AM . Paratypes: 1 diss. ♂, MGAB CUM 1685 ; 1♂, P.64659; 2♀♀, 1♂, P.90812.

Etymology. The species is named in honour of Dr Alecsandru Radu, medicine expert in blood circulation who helped me very much in recovering my health problems, as a sign of high gratitude.

Diagnosis. Carapace 0.35 of entire length, 2 pairs of groups of large lenses; maxilliped 3 basis, massive; pereopod 1 propodus as long as carpus; pereopod 2 carpus, 2nd longest article; dactylus 2.5 propodus length; uropod peduncle 1.1 pleonite 6 length; exopod 0.07 endopod length, endopod 2.7 peduncle length, 9 small setae on inner margin.

Description. Carapace 0.35 of entire length, 1.8 as long as high; posterior elevation; straight pseudorostrum, 0.36 carapace length; large antennal notch; 2 pairs of groups of large lenses; anterolateral corner with 1 small tooth ( Fig. 52 A ). — Pleon, half of entire body. — Antenna 1 peduncle article 1 0.7 rest of article’s length, with 3 simple setae; article 2 with 1 process, 2 simple and 2 pedunculate setae; article 3 with 3 pedunculate setae; main flagellum 1.1 article 3 length, accessory flagellum with 1 article; aesthetascs 1.8 main flagellum length ( Fig. 52 B ). — Maxilliped 3 basis 0.9 rest of article’s length, with 3 plumose setae; merus 2.6 ischium length, with 2 plumose setae; carpus as long as merus, with 1 plumose and 3 simple setae; propodus 1.1 carpus length, with 1 plumose and 2 appose setae; dactylus 0.6 propodus length, with 2 simple and 2 microserrate setae; with exopod ( Fig. 52 C ). — Pereopod 1 0.6 rest of article’s length, with hyaline fringe and 1 simple seta; merus carpus as long as propodus, twice dactylus length; merus 1.7 ischium length, with 1 simple setae; carpus 1.9 merus length, with 2 simple setae; propodus 1.05 carpus length, with 5 simple setae; dactylus 0.4 propodus length, with 6 simple setae; with exopod ( Fig. 52 D ). — Pereopod 2 basis 1.1 rest of article’s length, with hyaline fringes; merus as long as ischium, with 1 simple seta; carpus 1.5 merus length, with 5 simple setae; dactylus 2.5 propodus length; with exopod ( Fig. 52 E, F ). — Pereopods 3–5 with decreasing basis and increasing carpus length; dactylus fused with terminal simple seta; pereopods 3 and 4 with exopods ( Fig. 52 G-I). — Uropod peduncle 1.05 pleonite 6 length; exopod, 0.07 endopod length, with 1 long robust terminal seta; endopod 2.7 peduncle length, with 9 short simple setae medially and 1 robust terminal simple seta ( Fig. 52 J ).

Remarks. Schizotrema radui sp. nov. is the only species of the genus with such uropods, tiny exopod and huge endopod.

Distribution. Australia: WA—Cape Range National Park and Dampier Archipelago, at 0–14 m; and NSW—east of Newcastle, at 2632–2698 m depth.

Figures

Figure 52. Schizotrema radui sp. nov. Holotype male (A) body, lateral view; (B) antenna 1; (C) maxilliped 3; (D) pereopod 1; (E) pereopod 2; (F) pereopod 2 dactylus, magnified; (G) pereopod 3; (H) pereopod 4; (I) pereopod 5; (J) uropod. Scales: A 0.5 mm; B 0.1 mm; C 0.2 mm; D–H 0.3 mm; I 0.2 mm.