Species: Notacanthurus baei Braasch & Boonsoong, 2009
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Ephemeroptera
   Family: Heptageniidae
    Genus: Notacanthurus
Collection specimen
Holotype:
 - mature larva, male in Zoological Museum, Kasetsart University, Bangkok
Paratype:
     - 2 mature larvae, in Zoological Museum, Kasetsart University, Bangkok

Morphology:
Adult:
 -
Larva:
 Differing from genuine Notacanthurus, male larva matches that of Electrogena in having a simple, apical penis bulb with distally paired portions as wide as proximal integral portion provided with titillators medially. In contrast to Notacanthurus, it bears denticles on the claws; hind margin of head is nearly straight. With Notacanthurus it shares the head proportions, the longitudinal median ridge with posterior spines on terga 1-9 as well as the colouration pattern of terga, the crossbar on the dorsal surface of the femur medially and the microstructure as chagrination of terga surface. Gill set differs from that of Notacanthurus by having the first gill knife-shaped, gills 2-6 moderately lanceolate and gill 3 narrower lanceolate. Mouthparts differ from Notacanthurus in having the labrum more tapered and with longer decurved wings and mandibles with shorter stocky shafts (Braasch and Boonsoong, 2009).


Figure


Dorsal habitus of Notacanthurus baei (Source: Braasch and Boonsoong, 2009)
Habitat: Nothacanthurus baei larvae inhabit small streams and brooks. Larvae were usually found together with those of Asionurus species.

Distribution:
 - Mae Hong Son Province: Doi Inthanon National Park
 - Chiang Mai Province: Doi Suthep National Park

Work cited:
 - (1) Braasch, D. and Boonsoong, B. 2009. A new Notacanthurus Tshernova, 1974 and a new Rhithrogena Eaton, 1881 (subgenus Tumungula Zhou & Peters, 2004) from Thailand (Heptageniidae,Ephemeroptera). Zootaxa 2166: 33–44.
 - (2) Boonsoong, B. and Braasch, D. 2013. Heptageniidae (Insecta, Ephemeroptera) of Thailand. ZooKeys 272: 61–93.

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