Species: Procloeon rubeosternum  Tungpairojwong & Bae, 2015
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Ephemeroptera
   Family: Baetidae
    Genus: Procloeon
Collection specimen
Holotype:
 - Male adult in Entomological Museum of Korea University
Paratype:
     - 4 male adults (light trap) and 1 female adult in Entomological Museum of Korea University

Morphology:
Adult:
 Adult: hindwings present, reduce in size; metathorax with paired dark reddish brown spots laterally; mesosternum with paired reddish brown spots medially on anterior margin (Tungpairojwong and Bae, 2015).
Larva:
 Larva: lacinia of maxillary with single enlarged acute tooth, depressed near apex; maxillary palp terminal segment ca. 0.5×length of segment 2, apically conical; lateral spines on tergum 8 poorly developed, with 1-2 spines; terga 3 and 6 with one pair of white streaks on anterior margin submedially (Tungpairojwong and Bae, 2015).


Figure


Mature nymph of Procloeon rubeosternum (Source: Tungpairojwong and Bae, 2015)
Habitat: The larvae of Procloeon rubeosternum occurred in mountain streams ranging 240-330 m in altitude. The larvae were found from slow-flowing pool areas in the streams with abundant fallen leaves and algae. The substrates mainly consisted of boulders, cobbles, and gravel on a bedrock.

Distribution:
 - northern Thailand

Work cited:
 - Tungpairojwong, N. and Bae, Y.J. 2015. Three New Species of Procloeon (Ephemeroptera: Baetidae) from Thailand. Animal Systematics, Evolution and Diversity 31(1): 22–30.

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