Schizotrema leswatlingi, 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

Schizotrema leswatlingi sp. nov.

Fig. 51

Holotype adult ♀, 1.35 mm, P.90807, Australia, WA, Dampier Archipelago , 1 km northeast of Legendre Island, -20.389° 116.897°, 14 m, by hand on SCUBA, dead coral, 6 Aug 2000, P.A. Hutchings, L. Avery, WA 645, in AM . Paratype, 1♀, P.65607.

Etymology. The species is dedicated to Prof. Dr Les Watling (University of Hawaii, U.S.A.), world specialist in Peracarida, as a sign of extreme appreciation of his work and gratitude for his help in receiving the scholarship from the Australian Museum in 2003.

Diagnosis. Carapace 0.4 body length; pereonites 3–5 with dorsal pair of acute tubercles, pleonites 2–6 also with a pair of dorsal acute tubercles; maxilliped 3 merus as long as propodus, longer than carpus and dactylus; pereopod 1 bulky merus with a dorsal tooth, propodus 1.2 carpus length, 2 dactylus length; pereopod 2 carpus 2nd longest article; uropodal peduncle 0.64 of pleonite 6 length, exopod as long as 6th pleonite, half of endopod, terminal robust seta 1.32 exopod length, endopod, twice peduncle length, with 2 subterminal setae and a terminal robust one.

Description. Carapace 0.4 body length, 2 longer than high; 1 anterior dorsal elevation at basis of frontal lobe with 2 teeth, 1 pair of teeth medially, with 2 stronger teeth and 1 posterior elevation with 3 pairs of teeth; pseudorostrum 0.4 carapace length, lobes meeting in front of ocular lobe, oblique directed, with terminal teeth; ocular lobe with 2 pairs of teeth between the two groups of lenses; anterolateral margin serrate; anterolateral process downwardly bent; antennal notch, large ( Fig. 51 A ). — Pereonites 3–5 with dorsal pair of acute tubercles. — Pleonites 2–6 also with a pair of dorsal acute tubercles. — Antenna 1 peduncle article 1 0.9 rest of article’s length; article 2 1.1 article 3 length, with process; main flagellum, with 2 articles; accessory flagellum with 1 article; aesthetascs 2.8 main flagellum length ( Fig. 51 C ). — Maxilliped 3 basis 0.5 rest of article’s length, with 4 plumose setae; merus 4 ischium length, with 1 plumose seta; carpus 0.9 merus length, with 3 plumose setae; propodus 1.1 carpus length, with 1 plumose and 2 pappose setae; dactylus 0.8 propodus length, with terminal simple setae; with exopod ( Fig. 51 D ). — Pereopod 1 basis 0.24 pereopod length, with serrate margin; merus 2.6 ischium length, with 1 tooth; carpus 1.3 merus length, with 2 setae; propodus 1.2 carpus length, with 1 simple seta; dactylus 0.5 propodus length, with 1 terminal simple seta ( Fig. 51 E ). — Pereopod 2 basis 0.3 pereopod length, with hyaline fringe; merus 7 ischium length, with 1 simple seta; carpus 1.2 merus length, with 2 simple setae; dactylus 2 propodus length, with 7 simple terminal setae ( Fig. 51 F ). — Pereopods 3–5 with decreasing basis and increasing carpus; dactylus fused with terminal simple seta ( Fig. 51 G–I ). — Uropod peduncle 0.64 pleonite 6 length, as long as exopod; exopod 0.4 endopod length, with 1 terminal simple robust seta; endopod serrate medially, with 2 simple setae ( Fig. 51 J ).

Remarks. Schizotrema leswatlingi sp. nov. has an anterolateral process downwardly bent, a feature otherwise present only in S. bidens Fage (1945) from Annam (central Vietnam). Taking into consideration the sexual dimorphism (only males are known for the Vietnamese species) present also in this genus, the new species differs with: elevations, tubercles and teeth from dorsal side of body, pereopod 1 with propodus longer than carpus instead of equal length, smaller ratio peduncle of uropod/ last pleonite.

Distribution. Australia: WA—Dampier Archipelago and Turquoise Bay, at 14 m depth.

Figures

Figure 51. Schizotrema leswatlingi sp. nov. Holotype female (A) body, lateral view; (B) body, drosal view; (C) antenna 1; (D) maxilliped 3; (E) pereopod 1; (F) pereopod 2; (G) pereopod 3; (H) pereopod 4; (I) pereopod 5; (J) uropod; (K) tip of uropodal endopod, detail.Scales: A,B 0.3 mm; C 0.1 mm; D–J 0.1 mm; K 0.1 mm.