Species: Thalerosphyrus sinuosus Navás, 1933
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Ephemeroptera
   Family: Heptageniidae
    Genus: Thalerosphyrus

Morphology:
Larva:
 The larva of T. sinuosus can be differentiated by the combination of the following characters: gill 3 of rounded shape is much less wide than that of T. vietnamensis (Boonsoong and Braasch, 2013).


Figure


Larva of Thalerosphyrus sinuosus
Habitat: The larvae are found underneath stones in slow-flowing reaches of streams (water velocity approximately 3-7 cm/sec, water depth ranges between 7–17 cm). The larvae cling to submerged boulders and cobbles. Because they feed by grazing on diatoms, algae and detritus on stream rocks, they prefer rocky substrates in fairly clear to silty sediments (Boonsoong and Braasch, 2013).

Distribution:
 - northen Thailand
 - northeastern Thailand
 - western Thailand
 - central Thailand
 - southern Thailand
 - southwestern Thailand

Work cited:
 - Boonsoong, B. and Braasch, D. 2013. Heptageniidae (Insecta, Ephemeroptera) of Thailand. ZooKeys 272: 61–93.

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