Species: Gilliesia ratchaburiensis  Boonsoong & Sartori, 2015
Classification
Phylum: Arthropoda
 Class: Insecta
  Order: Ephemeroptera
   Family: Leptophlebiidae
    Genus: Gilliesia
Collection specimen
Holotype:
 - male imago in Zoological Museum, Kasetsart University, Bangkok
Paratype:
     - 4 mature nymphs in Zoological Museum, Kasetsart University, Bangkok; 4 nymphs mature nymphs in Musée cantonal de zoologie, Lausanne, Switzerland; 9 nymph and 1 male imago inZoological Museum, Kasetsart University, Bangkok; 1 male imago in Musée cantonal de zoologie, Lausanne, Switzerland

Morphology:
Adult:
 Male imagos of the new species have penis lobes more straight and with the apical portion bent laterally but not ventrally, and female abdominal sternum 9 with a U-shaped, deep, median cleft (Boonsoong and Sartori, 2015).
Larva:
 The nymph has bifid gills, a dense patch of setae on the ventral side of the glossae, no posterolateral spines on abdominal segment 8, maxillary palpi 3-segmented and very reduced maxillary canines (Boonsoong and Sartori, 2015).


Figure
Imagos of Gilliesia ratchaburiensis (A) head of female imago, dorsal view; (B) forewing of female imago; (C) hindwing of female imago; (D) male genitalia, ventral view (inset in lateral view); (E) female genitalia, ventral view.


Male mature nymph of Gilliesia ratchaburiensis (Source: Boonsoong and Sartori, 2015)
Habitat: The nymphs were found in leaf bags of Bambusa bambos and Lagerstroemia floribunda in both pools and riffles habitats.

Distribution:
 - Ratchaburi Province

Work cited:
 - Boonsoong, B. and Sartori, M. 2015. The nymph of Gilliesia Peters & Edmunds, 1970 (Ephemeroptera: Leptophlebiidae), with description of a new species from Thailand. Zootaxa 3981 (2): 253–263.

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