Trichotichnus (Iridessus) shunichii Ito, 2021

Kataev, B. M., 2022, Description of two new subgenera of Trichotichnus, with new brachypterous species from New Guinea and Sumatra (Coleoptera: Carabidae), and notes on three previously described species, Russian Entomological Journal 31 (4), pp. 373-384 : 384

Trichotichnus (Iridessus) shunichii Ito, 2021

Trichotichnus shunichii Ito, 2021: 68 .

MATERIAL EXAMINED. N Vietnam, Thai Nguyen Prov., 40 km Thai Nguyen, 300 m, 19.XII.1962, O. Kabakov leg. ( ZIN) .

REMARKS. Described from a single male from Mt. Tam Dao, Vinh Phu Province, Northern Vietnam, without subgeneric affiliation as somewhat similar to Trichotichnus (Parairidessus) saluki Kataev, 2020. Though T. shunichii is rather peculiar in some morphological features (for example, its body comparatively large, length about 10–11 mm, ventral surface, including prosternum and abdominal sternites glabrous, not finely ciliate, lateral elytral groove with elongate convexity along this groove apically, last abdominal sternite of male with one pair of marginal setigerous pores, and median lobe serrate on ventral surface preapically), it possesses all distinctive characters of Iridessus (ligular sclerite narrow, almost parallel-sided, paraglossae wide, almost not separated from ligular sclerite and elytral umbilicate series consisting of about 20 setigerous pores) and may be included in this subgenus. Like many Iridessus , T. shunichii also has a pronotum with rounded sides and rounded basal angles and an aedeagus with an apical orifice shifted to the left side and with groups of small spines (spiny patches) in the internal sac. The degree of prosternal pubescence in Iridessus is rather variable.