Trichotichnus (s. str.) doiinthanonensis Ito, 1997

Kataev, Boris M., Hongbin, Liang & Wrase, David W., 2022, New data on carabid beetles of Trichotichnus s. str. (Coleoptera: Carabidae) of Yunnan (China) and adjacent areas, with description of six new species and two new subspecies, Zootaxa 5159 (3), pp. 301-353 : 324-326

Trichotichnus (s. str.) doiinthanonensis Ito, 1997

( Figs. 36 , 47–52 & 73 )

Trichotichnus (s. str.) doiinthanonensis Ito, 1997: 48 .

Material examined. China. YUNNAN: 1 male, Gongshan, Dulongjiang , 0.5 km WSW Maku, trail, 27.68310°N 98.30038°E, 1845 m, day, 29.VIII.2006, D. Kavanaugh leg. ( IOZ) ; 1 male, Xishuangbanna, 35 km NW Jinghong , vic. Guo Men Shan ( NNNR) , 1110 m, 22°14.43′N 100°36.12′E, 18.VI.2019, LFF, A. Weigel leg. ( NME) .

Vietnam. HA TINH: 1 male, 30 km SE of Vu Quang (Phu Quon), Nature Reserve , 700 m, 5–26.VIII.1997, M. Kalyakin leg. ( SIEE) .

Re-description. Body length in the examined specimens 8.2–8.5 mm. Habitus as in Fig. 36 . Morphological character states are similar to those as described for T. cyrtops , but differing mostly as follows.

Body slenderer and flatter. Supraorbital setigerous pores situated slightly before level of posterior margin of eye. Genae very narrow, narrower than antennomere 3 basally. Paraglossae markedly longer than ligular sclerite. Elytra with distinct but rather shallow preapical sinuation (as in Fig. 39 ). Humeri without denticle. Protibia with longitudinal sulcus on dorsal side. Metatarsus about as long as HWmax. Mesotarsomere 1 in both sexes at least as long as mesotarsomeres 2 and 3 combined, in male without adhesive scales. Pro- and mesotarsomeres 2 and 3 of male longer than wide.

Median lobe of aedeagus ( Figs. 47–52 ) in lateral view arcuate, narrow, angularly bent ventrally just at apex and slightly swollen at tip forming a small apical capitulum; in dorsal view comparatively wide, somewhat parallel-sided, with terminal lamella ( Figs. 47, 50 ) comparatively short, strongly narrowed posteriorly; its apex narrowly rounded. Ventral side in apical portion edged laterally and depressed between margins. Apical orifice in dorsal position, wide apically. Internal sac without spines and distinct spiny patches.

Proportions (in males from Xishuangbanna and Phu Quon): HWmax/PWmax 0.69–0.73; HWmin/PWmax 0.53–0.54; HWmax/HWmin 1.29–1.36; PWmax/PL 1.45–1.47; PWmax/PWmin 1.19–1.23; EL/EW 1.53–1.57; EL/PL 3.02–3.18; EW/PWmax 1.34–1.40.

Proportions (in male from Dulongjiang): HWmax/PWmax 0.69; HWmin/PWmax 0.51; HWmax/HWmin 1.36; PWmax/PL 1.50; PWmax/PWmin 1.15; EL/EW 1.55; EL/PL 3.14; EW/PWmax 1.35.

Distribution ( Fig. 73 ). Described from four specimens collected in Doi Inthanon, Chiang Mai, Thailand. It is recorded here for China (Yunnan) and Vietnam (Ha Tinh) for the first time.

Remarks. In the male from southern Yunnan (Xishuangbanna) and Vietnam (Phu Quon), the aedeagus ( Figs. 47–49 ) agrees with the original description ( Ito, 1997: 48), and the last visible abdominal sternite (VII) is subtruncate at apex, but in the male from northwestern Yunnan (Dulongjiang), the median lobe ( Figs. 50–52 ) is slightly less arcuate and with shorter terminal lamella, and the apex of the last visible abdominal sternite is rounded. The male from Dulongjiang can belong to a separate taxon (subspecies or species) distributed in northwestern Yunnan, but since only one male is available, additional material from China is needed to determine its taxonomical status and the nature of these differences.

This and the following four species ( T. schmidti sp. n., T. fedorenkoi sp. n., T. subangulatus Ito, 2021 , and T. noctuabundus Habu, 1954 ) are very similar in external morphology and differing mostly in the male genitalia. These species apparently are closely related and represent a natural group (named here from the oldest nominal species as the noctuabundus species group) with the following distinctive features: appendages brownish yellow, femora not darker than tibiae; pronotum with sides not or only hardly sinuate basally and with basal angles obtuse, without prominent denticle; protibia on dorsal side with longitudinal sulcus; elytra with distinct but rather shallow preapical sinuation; tarsi without dense setae on ventral side; mesotarsomere 1 elongate, about as long as mesotarsomeres 2 and 3 combined, in male without adhesive scales ventrally; last visible abdominal sternite in male with one pair of marginal setae, and aedeagus with short and wide terminal lamella and without individual spines in internal sac. All the species of this group are winged and their ranges are at least partly overlapping. In external features, these species are very similar to T. cyrtops , but the latter species easily differs from them in having elytra with rather deep preapical sinuation, protibia not sulcate on dorsal side and mesotarsomere 1 of male with adhesive scales at apex.

Habu (1961, 1973) included T. noctuabundus in the longitarsis species group, but it differs from other members at least in having legs relatively shorter and pro- and mesotarsi of male with sparser ventro-lateral setae.

Figures

FIGURE 73. Trichotichnus spp., distribution: T. doiinthanonensis Ito, 1997 (circles); T. fedorenkoi sp. n. (squares).

FIGURES 35–37. Trichotichnus spp., habitus. 35, T. cyrtops (Tschitschérine, 1906) (Yunnan); 36, T. doiinthanonensis Ito, 1997 (Dulongjiang); 37, T. fedorenkoi sp. n. (Tam Dao). Scale bar = 1.0 mm.

FIGURES 47–52. Trichotichnus doiinthanonensis Ito, 1997 (47–49, Yunnan, Xishuangbanna; 50–52, Yunnan, Dulongjiang). 47 & 50, terminal lamella of aedeagus; 48, 49, 51 & 52, median lobe of aedeagus. Dorsal (47, 49, 50 & 52) and lateral (48 & 51) views. Scale bars: A = 0.5 mm (47 & 50), B = 1.0 mm (48, 49, 51 & 52).

FIGURES 38–39. Trichotichnus spp., elytral apex. 38, T. cyrtops (Tschitschérine, 1906); 39, T. schmidti sp. n. Scale bar = 0.5 mm.