A new genus and two new species of oonopid spiders from Myanmar (Araneae, Oonopidae)

Abstract A new genus, Promolotragen. nov., including two new species, P. hponkanrazisp. nov. (♂♀) and P. shankhaungsp. nov. (♂), is described from Myanmar. The new genus is similar to Molotra Ubick & Griswold, 2011 but can be distinguished by the completely fused bulb and cymbium, the presence of a receptacle, the absence of grooves connecting either the anterior or posterior pairs of spiracles, and the incised labium of both sexes.


Materials and methods
The specimens were examined using a Leica M205C stereomicroscope. Details were studied under an Olympus BX51 compound microscope. Photos were made with a Canon EOS 550D zoom digital camera (18 megapixels) mounted on an Olympus BX51 compound microscope. Vulvae were cleared in lactic acid. Scanning electron microscope images (SEM) were taken under high vacuum with a Hitachi TM3030 after critical point drying and gold-palladium coating. All measurements were taken using an Olympus BX51 compound microscope and are in millimeters. The type material is deposited in the Institute of Zoology, Chinese Academy of Sciences in Beijing (IZCAS).
Etymology. The generic name refers to the similarities of this genus and Molotra and is feminine in gender.
Diagnosis. Promolotra gen. nov. resembles Molotra Griswold, 2011 (Ubick andGriswold 2011) by the heavily sclerotized dorsal and ventral abdominal scuta, the long spines on legs I and II, and the embolar region, but can be distinguished by the completely fused bulb and cymbium, the presence of a receptacle, the absence of grooves connecting either the anterior or posterior pairs of spiracles, and the incised labium of both sexes. The new genus is also similar to Costarina Platnick & Dupérré, 2011 by the heavily sclerotized dorsal and ventral abdominal scuta, the long spines on legs I and II, the absence of grooves connecting either the anterior or posterior pairs of spiracles, and the fused cymbium and bulb, but can be distinguished by the absence of 3 transverse ridges on the sternum, the embolar region which barely extends beyond the tip of the cymbiobulbus, and the incised labium of both sexes. The genus Costarina has 3 transverse ridges on the sternum, the embolar region is divided into two black prongs that distinctly extend beyond the tip of the cymbiobulbus, and the labium is not indented at the anterior margin (Platnick and Dupérré 2012).
Distribution. Known only from the type locality. Etymology. The specific name is a noun in apposition taken from the type locality. Diagnosis. The new species is similar to P. shankhaung sp. nov. but can be distinguished by the uniformly colored tibiae (Figs 5E, 7G-J) (vs. darkened proximally in P. shankhaung sp. nov.), the relatively broad ventral lobe (length/width = 2.0) of embolar region (Fig. 6E) (vs. length/width of ventral lobe = 2.4 in P. shankhaung sp. nov.), and the shape of the cymbiobulbus (length/width = 1.5, basal part strongly swollen) (Figs 5H, J, 6A) (vs. length/width of cymbiobulbus = 1.7 and the basal part smooth in P. shankhaung sp. nov.).
Female. Unknown. Distribution. Known only from the type locality.