Cretorhyssalus brevis, Belokobylskij, 2012

Belokobylskij, Sergey A., 2012, Cretaceous braconid wasps from the Magadan Province of Russia, Acta Palaeontologica Polonica 57 (2), pp. 351-361 : 358

Cretorhyssalus brevis sp. nov.

Fig. 5 .

Etymology: From the Latin brevis , short; to emphasize the short body.

Holotype: male (?), PIN, 3901/81; wasp in lateral aspect lacking antenna, fore and middle legs entirely and apical half of hind leg, distal halves of fore wings, distal and posterior parts of hind wing and metasomal apex.

Type locality: Obeshchayushchiy fossil site, Magadan Province, Russia.

Type horizon: Cenomanian, Late Cretaceous , 99.6±0.9–93.5± 0.8 Myr, tuffaceous mudstone of the lacustrine Ola Formation.

Description.—Male (?). Body length 2.2 mm; metasoma 1.1 mm.

Head. Without characters for description. Antenna not preserved.

Mesosoma. Short and height, 1.3 times longer than maximum height, 0.75 times as long as metasoma. Mesoscutum not highly, but distinctly and roundly elevated above pronotum. Prepectal carina distinct. Propodeum quite possibly with areas delineated by carinae, or at least sculptured.

Fore wing. Apical half of fore wing absent. Costal vein (C+SC+R) thick. Pterostigma triangular, not wide, 2.5 times longer than maximum width. Radial vein (r) arising distinctly before middle of pterostigma, distance from this vein to apex of pterostigma along inner side 1.5 times longer than distance from vein to base of pterostigma. First radial abscissa (r) short, 0.4 times as long as maximum width of pterostigma, forming very obtuse angle with second radial abscissa (3−SR). First radiomedial vein (2−SR) 1.7 times longer than recurrent vein (m−cu), about 4.5 times longer than first radial abscissa (r). Second radiomedial (submarginal) cell possibly not narrowed distally. Recurrent vein (m−cu) almost interstitial, subparallel to basal vein (1−M), 0.7 times as long as second (posterior) abscissa of basal vein (1−M). Discoidal (discal) cell 1.3 times longer than wide. Nervulus (cu−a) postfurcal, distance from nervulus (cu−a) to basal vein (1−M) 0.3 times as long as nervulus (cu−a). Brachial (subdiscal) cell 2.5 times longer than its maximum width. Mediocubital vein (M+CU1) straight. First transverse anal vein (2A) fine and short.

Metasoma: First tergite wide, without clear spiracular tubercles, its length about 0.9 times apical width. Second tergite smooth, 0.8 times as long as first tergite, about as long as smooth third tergite. Laterotergites of second and third tergites possibly not separated.

Colour: Head and mesosoma black, metasoma brown. Fore wing almost hyaline. Pterostigma entirely and veins more or less brown.

Figures

Fig. 5. Braconid wasp Cretorhyssalus brevis gen. et sp. nov., holotype of male (?), PIN, 3901/81, Habitus in lateral view, Obeshchayushchiy fossil site (Magadan Province, Russia), Earliest Upper Cretaceous. Photograph (A) and drawing (B). Scale bars 1 mm.