Thyanta (Thyanta) serratulata Ruckes

Thyanta (Thyanta) serratulata Ruckes

Figs. 109-121

Thyanta serratulata Ruckes, 1957c: 178- 179 , figs. 5-6.

Diagnosis. Body shape broad, stout.

Lateral jugal margins sinuous, not parallel ( Fig. 110). Anterolateral pronotal margins immaculate, in dorsal view concave, serrate, especially anteriorly; humeral angles spinose, spines relatively short, directed anterolaterad ( Fig. 109). Pronotal cicatrices immaculate or often marked with black in each mesial angle. Postspiracular black spots absent. Anterolateral angles of abdominal sternites immaculate; posterolateral abdominal angles concolorous with rest of segment or sometimes marked with black. Basal plates in caudoventral view with mesial margins straight to slightly convex; posterior margins sinuous ( Fig. 116). Pygophoral opening subtended by semicircular impression; posterior margin of pygophore produced posterodorsad, convex with small, medial, V-shaped emargination in caudal view ( Fig. 114); slightly concave in lateral view ( Fig. 115).

Types. Ruckes (1957c) described T. serratulata from 1355 and l 3'i''i' specimens. The holotype and 17 paratypes were examined. The holotype is housed in the California Academy of Sciences (San Francisco).

Distribution. Known only from the type locality: Clarion Island, Revillagigedo Islands, Mexico.

Specimens examined. 21 specimens collected between 27 February and 8 May; deposited in AMNH, CAS, LACM, USNM. MEXICO: Colima: Revillagigedo Islands , Clarion Island .

Comments. Thyanta serratulata can be identified by the broad, stout shape, the short humeral spine, the lack of post-spiracular black spots, and the reduction or absence of black markings on the lateral abdominal angles.