Nannastacus papadopoli, 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 : 37

Nannastacus papadopoli sp. nov.

Fig. 42

Holotype ♀, 2.1 mm, P.90990, Australia, QLD, Lizard Island lagoon, -14.67° 145.45°, 6 m, plankton tow, 24 Jul 1979, J.M. Leis, JML 79/24.7.4, in AM . Paratype: 1♀, P.64710.

Etymology. The species is dedicated to the late Aurel Papadopol (1923–2009), former deputy director of “Grigore Antipa” National Museum of Natural History (1966– 1989), brilliant Romanian ornithologist, as a sign of deep posthumous gratitude for his work and also for offering me his microscope on which I made the first studies on Cumacea .

Diagnosis. Carapace 0.39 entire body length, with distally dilated granules, mid dorsal curved tooth, anterolateral process with a terminal tooth, serrate both margins; pereopod 1 dactylus 0.4 propodus length; pereopod 2nd carpus as long as propodus and dactylus together; uropodal peduncle 0.6 pleonite 6 length; endopod 2.6 peduncle length, 6 exopod length, endopod with 3 short setae.

Description. Carapace 0.39 body length, 1.3 as long as high, upturned pseudorostrum, with distally dilated granules; mid dorsal curved tooth; anterolateral process with 1 terminal tooth; serrate both margins; pseudorostrum 0.4 carapace length ( Fig. 42 A, B). — Antenna 1 peduncle article 1 1.1 rest of article’s length, with 3 simple setae; article 2 0.8 article 3 length, with 1 tubercle and 2 pedunculate setae; main flagellum 0.7 article 3 length; accessory flagellum with 1 article; aesthetascs 4.2 main flagellum length ( Fig. 42 C). — Maxilliped 3 basis 0.7 rest of article’s length, with 3 plumose setae; merus 2.7 ischium length, with 2 plumose setae; carpus 1.1 merus length, with 1 plumose and 2 simple setae; propodus 1.15 carpus length, with 1 plumose and 2 pappose setae; dactylus 0.5 propodus length, with 3 simple setae; with exopod ( Fig. 42 D). — Pereopod 1 basis 0.5 rest of article’s length, with hyaline crest; merus 1.5 ischium length; carpus 1.7 merus length, with 2 simple setae; propodus 1.2 carpus length, with 2 simple setae; dactylus 0.4 propodus length, with 6 simple setae; with exopod ( Fig. 42 E). — Pereopod 2 basis 0.9 rest of article’s length, with hyaline crest; merus 3 ischium length; carpus 1.6 merus length, with 2 simple setae; dactylus 2 propodus length, with 7 simple setae; with exopod ( Fig. 42 F). — Pereopods 3–5 with decreasing basis and increasing carpus; dactylus fused with terminal simple seta ( Fig. 42 G–H). — Uropod peduncle 0.6 pleonite 6 length; endopod 2.6 peduncle length, 6 minute exopod length; exopod with long terminal seta; endopod 7 exopod length, with 3 short setae medially and 1 terminal simple seta, shorter than in exopod ( Fig. 42 I).

Remarks. Nannastacus papadopoli sp. nov. resembles N. antipai Petrescu, 1995 and N. wisseni Petrescu, 1997 from the Indo-Malayan region with a mid-dorsal tooth on the carapace. It differs with posterior teeth on the carapace, acute anterolateral process, integument of carapace with distally dilated granules vs. tiny and densely tubercled, pereopods 3–5 with the dactylus fused in present new species, not fused in the aforementioned two species; N. papadopoli and N. antipai have three short setae on medial margin of uropodal endopod, N. wisseni has seven setae.

Distribution. Australia: QLD—Lizard Island, 6 m; and NSW—northern side of Bannister Head, 18 m depth.