Thalerosphyrus, Eaton, 1881

Vasanth, M., Kubendran, T., Subramanian, K. A. & Babu, R., 2025, Two new species of the genus Thalerosphyrus Eaton, 1881 (Ephemeroptera: Heptageniidae: Ecdyonurinae) from India, Zootaxa 5583 (2), pp. 247-270 : 269-270

publication ID	https://doi.org/10.11646/zootaxa.5583.2.2
publication LSID	lsid:zoobank.org:pub:E5168208-01D7-4218-BE79-67B2E0E61E5E
DOI	https://doi.org/10.5281/zenodo.14812191
persistent identifier	https://treatment.plazi.org/id/034C87ED-FFE9-FF80-D8B5-B2238F8EFEC5
treatment provided by	Plazi
scientific name	Thalerosphyrus
status

Treatment

Larval key to the genus Thalerosphyrus View in CoL View at ENA from India

1. Posterolateral expansions of abdominal segments well developed on III–VIII and directed outwards ( Figs 97–98 View FIGURES 96–103 ); pronotum greatly enlarged laterally and posteriorly ( Fig. 96 View FIGURES 96–103 ); anterior margin of the labrum with a smooth, shallow depression in the middle area ( Fig. 99 View FIGURES 96–103 )........................................................................... T. flowersi

- Posterolateral expansions of abdominal segment III–VIII moderately developed ( Figs 4–5 View FIGURES 4–5 , 53–54 View FIGURES 53–54 ); pronotum is moderately enlarged laterally and posteriorly ( Figs 4–5 View FIGURES 4–5 , 51 View FIGURES 51–52 ); labrum a different shape......................................... 2

2. Posterior margins of terga with irregular pointed teeth and a row of microdenticles ( Figs 84–86 View FIGURES 78–87 ); hind tibia with two rows of thin setae on the dorsal face of hind femora arrow-shaped......................................................3

- Posterior margin of tergites with regular pointed teeth, and numerous microdenticles ( Selvakumar et al. 2017: Fig. 21 View FIGURES 20–24 ); hind tibia with one row of thin setae; setae on the dorsal surface of hind femora truncate or rounded at apex ( Selvakumar et al. 2017: Fig. 15 View FIGURES 12–19 )............................................................................... T. meghalayensis

3. Hind femur dorsal surface with arrow-shaped, blunt and strong setae ( Fig. 40 View FIGURES 38–43 ); labrum expanded laterally, 4.5× wider than long, anterior margin straight, medially bulged with a concave shape and small blunt crenations on either side, ( Fig. 12 View FIGURES 12–19 )........................................................................................... T. bengalensis sp. nov.

- Hind femur dorsal surface with arrow-shaped setae, clearly point ( Fig. 75 View FIGURES 68–77 ); Labrum moderately broad, 3.5× wider than long, anterior margin straight ( Figs 57–58 View FIGURES 55–62 )....................................................... T. sartorii sp. nov.