Algon tibetanus, Schillhammer, 2006

Li, Chong & Tang, Liang, 2023, New species and records of Algonina Schillhammer & Brunke, 2018, mainly from China, Zootaxa 5256 (5), pp. 457-482 : 466

Algon tibetanus species group

Diagnosis. The species group can be defined by the combination of following characters: Head and pronotum with fine microsculpture (type II) ( Fig. 3, 4 ); basal depression and punctural grooves of elytra with iso-diametrical microsculpture (type IIIa), surface between grooves glossy; bases of abdominal tergites with microsculpture (type IIIa); posterior margin of tergite VII with whitish seam; aedeagal paramere with medio-longitudinal elevation dorsally (toward median lobe), lateral extension not developed. The species group is endemic to Xizang, China.

Couplet # 6 in the key to species groups of Algon ( Schillhammer 2006: 140) should be modified as follows to accommodate the Algon tibetanus species group:

6 Elytra almost impunctate, densely micro reticulate, with rows of larger punctures............... uniformis species group

- Elytra densely punctate, without rows of larger punctures.................................................... 6a

6a Elytra with iso-diametrical microsculpture only in basal depression and punctural grooves of elytra...................................................................................................... tibetanus species group

- Elytra without micro-reticulation, or with micro-reticulation on entire surface.................... species incertae sedis

Figures

FIGURES 1–6. 1–3—Algon sphaericollis; 4–6—A. atronitidus; 1, 2, 4, 5—habitus; 3, 6—head (ventral aspect).