Cincticostella bifurcata Xie, Jia, Chen, Jacobus & Zhou, 2009

Martynov, Alexander V., Selvakumar, C., Subramanian, K. A., Sivaramakrishnan, K. G., Chandra, Kailash, Palatov, Dmitry M., Sinha, Bikramjit & Jacobus, Luke M., 2019, Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal, Zootaxa 4551 (2), pp. 147-179 : 170

Cincticostella bifurcata Xie, Jia, Chen, Jacobus & Zhou, 2009

( Fig. 112 )

Diagnosis. Larvae of C. bifurcata are similar to C. braaschi (see above) and C. femorata because of their significantly flattened bodies, legs and large projections on the pronotum and mesonotum.

Cincticostella bifurcata can be distinguished from C. femorata , C. braaschi and other representatives of the insolta complex by the following combination of characters: (i) genae are moderately developed; (ii) anterolateral angles of pronotum with projections directed forward and laterally; (iii) projections of mesothorax not notched; (iv) forefemur without distinct serration along inner and outer margins (only few short marginal protuberances or chalazae can be seen); (v) dorsal surface of forefemur usually with few protuberances or chalazae; (vi) middle and hind femora distinctly flattened; (vii) outer margin of middle femur with a well-developed apical projection; (viii) outer margins of mid- and hindfemora with shallow serration; (ix) inner margins of mid- and hindfemora without serration; (x) abdominal terga V–VIII with distinctly bifurcate projections; (xi) tarsal claw with 2 denticles, basal one larger than distal one.

Distribution. Reported from three widespread localities in mainland China ( Xie et al. 2009) and India (new data) ( Fig. 153 ).

Habitat. Cold, fast-flowing streams with cobble and gravel.

Remarks. The larva was adequately described from China by Xie et al. (2009), and our records represent the first report from India. Adult stages remain unknown.

Material examined. INDIA: 3 larvae, Arunachal Pradesh, Lower Subansiri District, Talle Valley , 27.537201 N, 93.959883 E, h ~ 2370 m a.s.l., 14.iv.2015, K.A. Subramanian— Reg. No. 5578/H13.

Figures

FIGURE 153. Map of distribution of the Cincticostella insolta complex representatives: a.—Cincticostella richardi sp. nov.; b.—Cincticostella sivaramakrishnani sp. nov.; c.—Cincticostella ranga sp. nov.; d.—Cincticostella bifurcata Xie, Jia, Chen, Jacobus & Zhou, 2008; e.—Cincticostella insolta (Allen, 1971); f.—Cincticostella braaschi Jacobus & McCafferty, 2008; g.— Cincticostella femorata (Tshernova, 1972). Note: Distributions of C. insolta and C. femorata in mainland China mentioned by Xie et al. 2009 could not be given on the map, due to insufficient data.

FIGURES 112–113. Larvae of Cincticostella bifurcata Xie, Jia, Chen, Jacobus & Zhou, 2008 from India (112) and C. femorata (Tshernova, 1972) from Thailand (113). Scale bar: 2 mm.