Cincticostella gosei (Allen, 1975)

Martynov, Alexander V., Selvakumar, C., Palatov, Dmitry M., Subramanian, K. A., Sivaramakrishnan, K. G., Vasanth, M. & Jacobus, Luke M., 2021, Overview of Indian and Nepali representatives of the Cincticostella nigra (Ueno, 1928) complex (Ephemeroptera, Ephemerellidae), with discussion about Cincticostella Allen, 1971 species complexes, ZooKeys 1040, pp. 123-166 : 123

Cincticostella gosei (Allen, 1975) Figs 13 , 14 , 15

Ephemerella (Cincticostella) gosei Allen, 1975

Serratella thailandensis Allen, 1980 (junior objective synonym, Edmunds and Murvosh 1995)

Diagnosis.

This species can be distinguished from other Cincticostella species by the following combination of characters: (i) head brown, with three white to yellow spots near ocelli (spots near lateral ocelli the largest) (Fig. 13A, B ); (ii) body covered with numerous large scale sockets and small scales in some of them (Figs 13B-E , 14A-C , 15A-C ); (iii) head without paired protuberances (Fig. 13B ); (iv) genae moderately developed (Fig. 13B ); (v) labrum with moderate anteromedian emargination (Fig. 14C ); (vi) maxillary palp absent (Fig. 14E ); (vii) glossae short, inner margins of paraglossae subparallel to longitudinal axis of body, held tightly against glossae (Fig. 14G ); (viii) labial palp segments I and II not flattened, elongated (Fig. 14F, G ); (ix) prothoracic anterolateral projections well-developed, bluntly pointed, directed forward (Fig. 13C, D ); (x) mesothoracic anterolateral projections poorly developed, not notched, rounded (Fig. 13C, D ); (xi) setal transverse band on dorsal surface of fore femur consisting of only several middle-sized stout setae; sometimes stout setae absent absolutely; (xii) inner margin of fore femur only with scattered, thin, hair-like setae (Fig. 15A ); (xiii) middle and hind femora moderately widened (Fig. 15B, C ); (xiv) dorsal surfaces of middle and hind femora without stout setae (Figs 13E , 15B, C ); (xv) outer margins of middle and hind femora without expressed projections (Fig. 15B, C ); (xvi) tarsal claw with 5-6 denticles and several subapical setae (Fig. 15D ); (xvii) small paired submedial projections present on terga II-IX; projections on tergum IX broad and rounded (Fig. 13F ).

Distribution.

Thailand ( Allen 1975, 1980) and the India-China border region (new data).

Remarks.

The larva of this species was properly described from Thailand by Allen (1975, 1980). We report this species for the first time from India. Adult stages are unknown. Main distinguishing characters of species are shown on Figs 13 - 15 . The characters typical for representatives of C. insolta and C. nigra complexes are analysed because of the separate position of this species (see below).

Habitat.

Cold fast-flowing river with cobbles and gravel. The Ranga River habitat is shown in Martynov et al. (2019: fig. 152).

Material examined.

India: 17 larvae, Arunachal Pradesh, Lower Subansiri District, Ranga River , 27.396404°N, 93.757378°E, h ~ 625 m a.s.l., 06.xi.2015, Coll. Bikramjit Sinha - IN 5346/H13 [ZSI] .

Figures

Figure 13. Larva of Cincticostella gosei (Allen, 1975) A habitus, dorsal view, scale bar 2 mm B head C thorax D anterolateral projections of pro- and mesonotum E dorsal surface of hind femur central area F abdomen, dorsal view.

Figure 14. Larva of Cincticostella gosei (Allen, 1975) A angulate mandible B planate mandible C labrum D hypopharynx E maxilla F labial palp G labium.

Figure 15. Larva of Cincticostella gosei (Allen, 1975) A fore femur B middle femur C hind femur D tarsal claw E-H gills III-VI.