Abstract
A new mayfly species, Sparsorythussescarorumsp. n. (Tricorythidae) is described from Mindoro Island, Philippines. Nymphs are characterized by the combination of the following characters: compound eyes of approximately equal size in both sexes, shape and setation of legs, presence of rudimentary gills on abdominal segment VII, and some details of mouthparts. Male imagines are characterized by the coloration pattern of wings and details of genitalia. The developmental stages are matched by DNA barcodes.
Highlights
The order Ephemeroptera is a monophyletic group of pterygote hemimetabolous insects with aquatic larvae and delicate membranous wings in the adult stage
Nymphs were collected from rocks partially or fully submerged in the riffle section of the stream (Figs 10a–d)
Processing and digital imaging of dissected parts was done using the latter stereo microscope equipped with DinoEye Eyepiece camera; the pictures were combined using CombineZP software (Hadley 2010) and were subsequently enhanced with Adobe Photoshop CS6
Summary
The order Ephemeroptera (mayflies) is a monophyletic group of pterygote hemimetabolous insects with aquatic larvae and delicate membranous wings in the adult stage. New species and genera have been recorded afterwards from several parts of the Philippines by Flowers and Pescador (1984), and Müller-Liebenau (1980, 1982), with the most recent studies conducted by Braasch and Freitag (2008), Sroka and Soldán (2008), Braasch (2011) and Batucan et al (2016). From these works, it can be inferred that there are eight families present in the Philippines: Baetidae, Caenidae, Ephemeridae, Heptageniidae, Leptophlebiidae, Prosopistomatidae, Teloganodidae and Tricorythidae.
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