A new mite of the genus Eupterotegaeus from Oregon (Cryptostigmata: Cepheidae)

Abstract

Diagnosis. Rostrum rounded, with out median spine; lamellae large, projecting over rostrum, with broadly rounded lateral margins and sharp beak-like inner margins; a triangular projection mediad to pteromorphae along dorsosejugal suture: differing from E. spinatus in the lack of translamellar spine and from E. rostratus in the rounded rostrum and sharply pointed lamellar cusps, and from both in having a projection mediad of humeral processes on dorsosejugal suture and all legs monodactylous. The trivial name comes from the Greek meaning curving beak and refers to the sharply pointed lamellar cusps. Description. Dark reddish-brown color; prodorsum about twothirds as long as hysterosoma and approximately as long as broad; rostrum rounded with small lateral projections; rostral hairs simple, inserted in anterolateral margins of rostrum; lamellae over three times as long as broad of nearly equal width throughout, lamellar cusps ending in sharp incurved anterior medial tips resembling a beak; lamellar hairs simple, as long as width of lamellae, incurved, extended beyond tip of lamellae and inserted near anterolateral edge; interlamellar hairs missing in type specimen, their insertions mediad of pseudostigmata; pseudostigmata heavy, cup-shaped, with roughened edges, directed anterola terally; sensillus club-shaped, shorter than the distance between the pseudostigmata, about twice as long as lamellar hairs, with a finely setose tip; no exobothridial hairs observed on type specimen. Hysterosoma rounded, with roughened anterolateral pteromorphs projected anteriorly; a triangular projection mediad of pteromorphs along dorsosejugal suture; surface with a light rectangular pattern; nine pairs of short, marginal setae observed, each seta set on a raised tubercle; areae porosae or muscle attachment scars along lateral margins of hysterosoma (Fig. 1).