Thyanta (Phacidium), Breddin

Subgenus Phacidium Breddin

Phacidium Breddin, 1912:92 ; Rolston and McDonald, 1984:83-84 (syn. with Thyanta ).

Type species. Phacidium euch lorum Breddin, 1912 (by monotypy).

Diagnosis. Punctation small, relatively dense, dorsal surface appearing matte. Distal end of sclerotized rod swollen subapically, narrowed and sometimes elongate distally ( Fig. 76); spermathecal bulb globose, usually with relatively large amount of coiling below proximal flange, sometimes forming cylindrical structure ( Fig. 62). Posteroventral surface of pygophore arcuately rounded or with deep, broad sulcus; posterior margin entire, sinuous ( Fig. 51), or sometimes broadly V-shaped ( Fig. 69). Each paramere apically acute, ectal surface convex ( Fig. 58), lacking dorsomedial concave surface.

Comments. The male genitalia are useful in separating species of Phacidium from species of the other two subgenera (see comments under subgenus Thyanta ). The female genitalia are also useful in separating species of Phacidium and Thyanta . Females of Argosoma can be recognized by their relatively sparse and coarse dorsal punctation.