Thalerosphyrus flowersi, Venkataraman and Sivamarakrishnan, 1987

Sutthacharoenthad, Waranid, Sartori, Michel & Boonsoong, Boonsatien, 2019, Integrative taxonomy of Thalerosphyrus Eatonı 1881 (Ephemeropteraı Heptageniidae) in Thailand, Journal of Natural History 53 (23), pp. 1491-1514 : 1494

publication ID 10.1080/00222933.2019.1657513

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Thalerosphyrus flowersi


Thalerosphyrus flowersi ; Venkataraman and Sivaramakrishnan, 1987

( Figures 1 View Figure 1 (a–c), 6(a), 7(a), 9(a), 10(a), 11(a))

Materials examined

THAILAND; 2 larvae (on slides), Baan Bor Luang , Nan Prov., 19.149568°N, 101.154603°E, alt. 659 m, 5-II-2016, B. Boonsoong leg. ( ZMKU); GoogleMaps 1 larva (in ethanol), Na Noi, Nan Prov., 18.333050°N, 100.620817°E, alt. 341 m, 26-VI-2017, B. Boonsoong leg. ( ZMKU); GoogleMaps 4 larvae (2 on slides; 2 in ethanol), Mae Na, Chiang Dao, Chiang Mai Prov., 19.320300°N, 98.890550° E, alt. 742 m, 11-III-2017, B. Boonsoong leg. ( ZMKU); GoogleMaps 2 larvae (in ethanol), Huai Ka Mui, Hua Hin, Prachuap Khiri Khan Prov., 12.978200°N, 99.582050°E, alt. 108 m, 24-II-2018, B. Boonsoong leg. ( ZMKU); GoogleMaps 4 larvae (in ethanol), Chan Ta Then waterfall, Sri Racha, Chonburi Prov., 13.242400°N, 101.044200°E, alt. 162m, 6-VI-2018, B. Boonsoong leg. ( ZMKU). GoogleMaps

Head. Labrum expanded laterally, ca. 3.75 times larger than long, with rounded apexes; dorsal surface and anterior margin covered with long and thin setae. Crown of the galealacinia of the maxillae with ca. 16–20 comb-shaped setae. Right mandible with 7–8 fimbriate setae below the inner incisor and ca. 4–5 long, simple and thin setae below the mola. Left mandible with 7–9 fimbriate setae below the inner incisor and ca. 5–6 long simple and thin setae below the mola. Hypopharynx with robust lingua bearing a tuft of small setae, superlinguae densely covered with long and thin setae up to the lower part of the superlinguae. Labium with glossae rhomboid, inner and outer margins clearly concave near apex ( Figure 6 View Figure 6 (a)).

Thorax. Pronotum greatly expanded laterally and posteriorly, and basally fused to the mesonotum ( Figure 1 View Figure 1 (a–b)). Femora with submarginal rows of pointed bristles on the inner and outer margins, increasing in numbers from the fore to the hind leg. Bristles on the dorsal surface of hind femora with subparallel or slightly convergent margin, apex rounded or truncate ( Figure 7 View Figure 7 (a)). Hind tibia with one row of thin setae and a row of 7–11 arrow-shaped bristles in marginal and submarginal position. Tarsal claw with 3–4 teeth ( Figure 9 View Figure 9 (a)).

Abdomen. Posterolateral expansion not developed on segment I, weakly developed on segment II, strongly developed on segment III and increasing in size up to VIII and subparallel to the body ( Figure 1 View Figure 1 (c)). Gill I with asymmetrical elongated and rounded plate, 1.5 times longer than wide ( Figure 10 View Figure 10 (a)). Gill II– VI strongly asymmetrical, wider than long. Gill VII oval and almost symmetrical. Posterior margin of tergites with irregularly pointed teeth and numerous row of microdenticle rows ( Figure 11 View Figure 11 (a)). Cerci whitish in the proximal part, with 3–4 dark brown bands increasing in size towards the apex.


Kiev Zoological Museum


Mykotektet, National Veterinary Institute