Torleya coheri ( Allen & Edmunds, 1963 )

Martynov, Alexander V., Selvakumar, C., Subramanian, K. A., Sivaramakrishnan, K. G., Vasanth, M., Sinha, Bikramjit & Jacobus, Luke M., 2021, Overview of Indian Hyrtanellini (Ephemeroptera: Ephemerellidae), with new species and records from related regions, Zootaxa 4975 (3), pp. 451-482 : 466-467

Torleya coheri ( Allen & Edmunds, 1963)

( Fig. 10 )

Ephemerella coheri Allen & Edmunds, 1963

Crinitella permkami Wang & Sites, 1999 (junior synonym, Jacobus & McCafferty 2003)

Material examined. INDIA: 14 larvae, Arunachal Pradesh, Lower Subansiri District, Tale Valley , 27.537201°N, 93.959883°E, h ~ 2370 m a.s.l., 14.iv.2015, Coll. K.A. Subramanian — Reg. No. 5608/H13 [ ZSI] ; 1 larva, Arunachal Pradesh, Lower Subansiri District, Ranga River , 27.396404°N, 93.757378°E, h ~ 625 m a.s.l., 21.iv.2015, Colls. K.A. Subramanian & Bikramjit Sinha — Reg. No. 5347/H13 [ ZSI] ; 13 larvae, Arunachal Pradesh, Papum Pare District, Dibru River , 27.147655°N, 93.74908°E, h ~ 128 m a.s.l., 22.iv.2015, Colls. K.A. Subramanian & Bikramjit Sinha — Reg. No. 5609/H13 [ ZSI] ; 1 larva, West Bengal, Darjeeling (Sikkim border), Rishikhola, Rishi River , 27.169677°N, 88.635109°E, h ~ 554 m a.s.l., 23.iii.2013, Coll. Srimoyee Basu — Reg. No. 5349/H13 [ ZSI] . NEPAL: 3 larvae, Bagmati Zone, East Rapti River , 27.571631, 84.668756, h— 230 m a.s.l., 27.i.2014, Chertoprud M. V . leg.— IN Nepa 16 Torsp 1 [ NMNH NASU] .

Diagnosis. This species can be distinguished from other Torleya species by the following combination of characters: Larva: (i) dorsal surface of body covered by long hair-like setae ( Fig. 10A ; fig. 1 in Allen & Edmunds 1963); (ii) maxilla with rudimentary palp (fig. 13 in Allen & Edmunds 1963); (iii) anteromedian emargination very shallow, almost absent (fig. 14 in Allen & Edmunds 1963); (iv) labium highly reduced (fig. 17 in Allen & Edmunds 1963); (v) abdominal segment VIII with a unique shape and setation ( Fig. 10A, C ; fig. 1 in Allen & Edmunds 1963; fig. 1 in Jacobus et al. 2007); (vi) posterolateral projections of segment IX extremely elongated ( Fig. 10A, C ; fig. 1 in Allen & Edmunds 1963); (vii) tarsal claw with distinct distal palisade of denticles ( Fig. 10B ; fig. 15 in Allen & Edmunds 1963); (viii) lateral margins of abdominal segments IV–VIII with short stout setae; stout setae on segment VIII pass over acute posterior projection (fig. 1 in Allen & Edmunds 1963); (ix) paired submedial projections on abdominal terga are absent ( Fig. 10C ; fig. 1 in Allen & Edmunds 1963); (x) gills III–VI with outer posterolateral protuberances, gill III not covering following gills entirely (figs 1, 16 in Allen & Edmunds 1963). Male imago: (xi) penis short, lobes apically rounded (fig. 2 in Jacobus et al. 2007); (xii) dorsal projection of penis small, rounded, with broad apical cleft (figs 2, 4 in Jacobus et al. 2007) (xiii) genital forceps segment II robust, with relatively straight lateral profile, not expanded apically and segment III subovoid (fig. 2 in Jacobus et al. 2007); (xiv) abdomen with light general coloration and purple shading, lacking a prominent, middorsal, longitudinal stripe (figs 3, 4 in Jacobus et al. 2007).

Distribution. India ( Allen 1980, Jacobus & McCafferty 2003, Jacobus et al. 2007, new data), India-China border region (new data), Malaysia ( Jacobus et al. 2007), Nepal ( Allen & Edmunds 1963, new data), Thailand ( Wang & Sites 1999; Jacobus et al. 2007) and Vietnam ( Jacobus et al. 2007).

Remarks. The larva of this species was adequately described and illustrated from Nepal by Allen & Edmunds (1963) and from Thailand by Wang & Sites (1999) (as Crinitella permkami Wang & Sites, 1999 , junior synonym). Larvae of this species already were reported from Kashmir, and the adult description and details of species variability were provided by Jacobus et al. (2007). Following Jacobus & McCafferty (2008), we consider Crinitella Allen & Edmunds, 1963 as a junior synonym of Torleya Lestage, 1917 . Ogden et al. (2009: figs 1, 2) could not confirm monophyly of Crinitella + Torleya , however, based on their partial sampling of these genus groups.

The other Indomalayan species of Torleya include T. dibruensis sp. nov., T. lacuna ( Jacobus, McCafferty & Sites, 2007) , T. longforceps ( Gui, Zhou & Su, 1999) , T. lutosa Kang & Yang, 1995 , T. naga Jacobus & McCafferty (in Jacobus et al.), 2004, T. nepalica ( Allen & Edmunds, 1963) and T. simbalbarensis sp. nov.

Figures

FIGURE 10. Larva of Torleya coheri (Allen & Edmunds, 1963). A.—total view of larva; B.—tarsus and tarsal claw, black arrow shows palisade of denticles; C.—abdomen, dorsal view. Scale bar 1 mm.