Two new species of Meyoarabiella Yakovlev, 2008 (Lepidoptera, Cossidae) from Namibia with World Catalogue of the Genus

The article describes two new species Meyoarabiella naumanni Yakovlev, sp. nov. (Type locality: Namibia, Region Iikaras, Klein Ausvista, Umg. Aus Region, S 26º40′19′′ / E 16º14′53′′) and M. vansoni Yakovlev, sp. nov. (Type locality: Namibia, Region Hardap, Umg. Mariental Hardap Damm, S 24º28.869 / E 17º50.364). The article is illustrated with 6 images (photos of the adults, male genitalia of the new species and the map of the genus distribution).


Material and methods
Specimens were collected by light-traps. Images of imago were taken by the digital camera of Apple iPhone 7, illuminated in Lightbox. The images were processed using CorelDraw software.
Slide-mounted genitalia were photographed with a Canon EOS 600D digital camera mounted on an Olympus U-CTR30-2 trinocular head combined with a Carl Zeiss microscope body. Sets of about 10 images were taken for each specimen and assembled to deep-focused images using Helicon Focus 6 and edited in Adobe Photoshop CS5. Description. Antenna bipectinate, crest processes long, 3−3.5 times longer than antenna rod diameter. Male fore wing 10−13 mm in length (holotype -10 mm). Fore wing brown, with sputtering of silver-grey scales at root and discally, series of big blurred dark-brown spots postdiscally (partially fused into wide transverse band), thin dark-brown transverse line submarginally, very thin light stripe on border of wing, fringe brown, unicolorous. Hind wing brown, without pattern, very thin light stripe on border of wing, fringe brown, unicolorous.
Male genitalia. Uncus long, thin, gnathos arms relatively robust, short; gnathos compact, covered with fine spikes; valve narrow, long, outer edge semicircular, costal and abdominal edge almost smooth; transtilla processes short, laminated, apically strongly curved and tapered, apical end strongly serrated (dorsally and abdominally); juxta tiny, with wide leaf-like lateral processes, saccus almost reduced; phallus short, robust, strongly curved in medium third, with needle-like cornutus in vesica.
Female unknown.

Diagnosis.
The new species is characterized by the bright dark coloring, and the transtilla processes apically strongly serrated (dorsally and abdominally).

Etymology.
The new species is named after the well-known German entomologist Stephan Naumannspecialist in Saturniidae, one of the collectors of both new species. Description. Antenna bipectinate, crest processes long 3−3.5 times longer than antenna rod diameter, Antenna 1.5 times shorter than fore wing in length. Length of fore wing 9 mm. Fore wing grey with brown portions basally and discally, thin dark-brown transverse line submarginally, very thin brown stripe on border of wing, fringe brown, unicolorous. Hind wing brown, without pattern, very thin brown stripe on border of wing, fringe brown, unicolorous. Male genitalia. Uncus relatively short, robust; gnathos arms relatively short, robust; gnathos small, narrow, densely covered with fine spikes; valve short, wide, outer edge rounded, costal edge smooth, abdominal edge oblique, gradually narrowing from base to apex; transtilla processes short, laminated, apices slightly curved, dorsal surface preapically serrated; juxta tiny, with wide leaf-like lateral processes; saccus almost reduced; phallus robust, short, straight, caudal end oblique, vesica without cornuti.

Diagnosis.
The new species is characterized by the small size and the absence of cornutus in the vesica.