Alaskaperla longidentata (Raušer, 1968)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 26-27

Alaskaperla longidentata (Raušer, 1968)

SYNONYMY

Chloroperla longidentata Raušer, 1968

Triznaka longidentata Zwick, 1972

Alaskaperla longidentata Zwick, 2007

TYPE LOCALITY: Mongolia: Ulan Bator, Nukht in Bogdo Ul , 1600 m .

DIAGNOSIS: General coloration yellow in life and pale when preserved ( Fig. 110), with a solid brown stripe originating on the pronotum and resuming along the length of the abdomen. The male epiproct is dark along its entire length ( Fig. 111). The epiproct is smooth and curved upward at the apex ( Fig. 111), the dorsal edge appearing concave when viewed laterally. This general epiproct shape superficially resembles that of Alloperla joosti ( Fig. 97), but in constrast, the epiproct of A. joosti is flat (not upturned), is swollen at the base, and has ventral spines near the apex which spines Ala. longidentata lacks entirely. The female subgenital plate ( Fig. 112) is parallel-sided, is truncate apically margin, and has a broad depression in the apical third. The plate completely occupies sternum 8 and extends over 1/3 of sternum 9. The nymph is characterized by its head coloration ( Fig. 113), with dark Ushaped marking that bisects the ocelli and is interrupted by an anterior pale marking on the frons which continues to the labrum.

DISTRIBUTION—Global: East Palearctic— Regional: AOB— Aimag: AR^, KhG, OV^, SE, TO^, UB*, ZA^.

DISCUSSION: This species was recently placed in Alaskaperla (Zwick 2007) but was originally described from Mongolia by Raušer (1968). Alaksaperla longidentata has a strong superficial resemblance to members of the Mongolian Alloperla , particularly similar to A. mediata in general coloration and to A. joosti in the epiproct shape, however Ala. longidentata is unique in its combination of coloration and epiproct shape with both a pronotal strip and a narrow recurved epiproct. In historical specimens that we reidentified, females of Ala. longidentata were commonly confused with S. teleckojensis (Šamal, 1939) ( Fig. 128), but can be readily distinguished by its more rectangular shape and lack of basal scelerotization.