Torleya lacuna ( Jacobus, McCafferty & Sites, 2007 )

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 : 471-472

Torleya lacuna ( Jacobus, McCafferty & Sites, 2007)

( Fig. 14 )

Crinitella lacuna Jacobus, McCafferty & Sites, 2007

Material examined. Holotype: larva, THAILAND, Kanchanaburi, stream, Amphur Thong Pha Phum, Heuy Ka Yaeng at Ban Padsadoo Klang , 14°33’N, 98°34’E, 296 m altitude, 9/IV/2003, L-457, Sites, AV, Prommi, Setaphan [ UMRM].

Diagnosis. The larva of this species can be distinguished from congeners by the following combination of characters: (i) one pair of blunt occipital protuberances present ( Fig. 14B ; fig. 5 in Jacobus et al. 2007); (ii) head, thorax and legs densely covered with long hair-like setae ( Fig. 14A, B ; fig. 5 in Jacobus et al. 2007); (iii) pronotum with four dorsal protuberances (fig. 5 in Jacobus et al. 2007); (iv) mesonotum with transverse brown shading medially; tip of fore wingpads pale to white, terga with dark longitudinal medial line and lateral shading; (v) terga III–IX, and sometimes tergum II, with paired posterior protuberances; on terga IV–VIII protuberances largest, usually with up to two spatulate, stout setae (fig. 5 in Jacobus et al. 2007); (vi) maxillary palp absent; (vii) posterolateral projections of terga IV–VIII produced dorsolaterally, forming the abdominal gill chamber; (viii) gills distinctly elongated, gill III entirely cover following gills (fig. 5 in Jacobus et al. 2007); (ix) tarsal claws with one or two basal denticles, two or three medial denticles, two to four long subdistal denticles on the inner margin, and subdistal setae; (x) foreleg with submedial row of long spatulate setae.

Distribution. Thailand and Vietnam ( Jacobus et al. 2007). The previous record from India ( Jacobus et al. 2007) is now questionable (see Remarks, immediately below).

Remarks. This species was described by Jacobus et al. (2007) based on larvae and subimagoes from Thailand and Vietnam. These authors also reported male and female subimagoes from Tamil Nadu ( India). The imago stages of T. lacuna are unknown. Previous reports of T. lacuna from India should be reviewed after subimagoes and imagoes of T. dibruensis sp. nov. and T. simbalbarensis sp. nov. have been discovered.

Figures

FIGURE 14. Larva of Torleya lacuna (Jacobus, McCafferty & Sites 2007), holotype: A.—total view of larva; B.—head, pronotum and fore femora. Scale bar 0.5 mm (photos by Dr. Robert W. Sites).