Cincticostella szechuanensis, Xie, Hui, Jia, Yan-Yan, Chen, Ping, Jacobus, Luke M. & Zhou, Chang-Fa, 2009

Xie, Hui, Jia, Yan-Yan, Chen, Ping, Jacobus, Luke M. & Zhou, Chang-Fa, 2009, Two new Cincticostella species from China with a larval key to species of the genus (Ephemeroptera: Ephemerellidae), Zootaxa 2299, pp. 53-61 : 56-57

Cincticostella szechuanensis sp. nov.

Mature larva: (degraded specimens, in ethanol; Figs.14 a, b); body length 9.5–12.0 mm. Caudal filaments 6.0–8.0 mm. Head with roughened appearance. Mouthparts: labrum with very shallow anteromedian emargination and setae relatively dense situated around margins. Maxilla( Fig.16 ) somewhat flattened, with row of setae along inner margin; palp with three distinct segments.

14: Dorsal view (a,b). 15: Pro- and Mesothoracic anterolateral projections (magnified image) Thorax: Prothorax expanded laterally, with rounded anterolateral projections. Mesothoracic anterolateral projections blunt and notched medially ( Fig. 15 ); mesal plate without spines or strong ridges. Femora longer than tibiae, with longitudinal ridge on upper surface and not strongly flattened nor marginally serrate; tibiae longer than tarsi; claw with two proximal denticles.

Abdomen: Abdominal terga without paired spines; posterior margins sometimes sinuate. Gills 3 slightly falcate, with inner margins longer than outer margins. Caudal filaments with very few intrasegmental setae, very few hairlike setae at articulations and small spines at alternate articulations.

Etymology: The specific epithet is a reference to the type locale.

Diagnosis. The new species is distinct among congeners in that it lacks any prominent paired processes on the abdominal terga.

Material examined: Holotype, larva, China, Sichuan (Szechuan) province, Kuanshien, 2000 ft. elev., II/ III-1930, deposited in the US National Museum of Natural History, Smithsonian Institution, Washington, DC, USA [USNM]. Paratypes, four larvae, same collection data [USNM].

16, maxilla of C. szechuanensis sp. nov.; Larval habituses: 17, C. femorata ; 18, C. fusca ; 19, C. gosei ; 20, C. insolta ; 21, C. nigra .

Figures

FIGURES 14 – 15. Mature larvae of C. szechuanensis sp. nov.

FIGURES 16 – 21. Characters of Cincticostella species