Trichotichnus (Bottchrus) minutus

Schmidt, Joachim, 2017, Brachypterous ground beetles of the Trichotichnus subgenus Bottchrus Jedlička (Coleoptera, Carabidae) from the Himalaya, with description of fifteen new species, Zootaxa 4323 (3), pp. 301-358: 331-332

publication ID

https://doi.org/10.11646/zootaxa.4323.3.1

publication LSID

lsid:zoobank.org:pub:3E58F99B-2A30-437A-95Ae-D68A1D3Ecc45

persistent identifier

http://treatment.plazi.org/id/03956A03-A373-7F62-FF67-FF368E6CD8E0

treatment provided by

Plazi

scientific name

Trichotichnus (Bottchrus) minutus
status

sp. n.

Trichotichnus (Bottchrus) minutus  sp. n.

( Figs 70View FIGURES 67 – 70, 87–90View FIGURES 87 – 90, 151View FIGURE 151, 11View FIGURES 5 – 13)

Type material. Holotype: ♂, “ NEPAL, Kathmandu-Tal Godawari , Mt. Phulchoki N-Hang, 1750 m, Ufergesiebe, 6.V.2001, leg. O. Jäger ” (cJS). 

Paratype: 1 ♂, “ NEPAL N Kathmandu Shivapuri Lekh 2–2300 m slope W of Bagmati riv. 22– 23.5.05 leg. Schmidt ” (cJS). 

Description. Habitus as in Fig. 70View FIGURES 67 – 70. Body length 5.5–6.0 mm, width 2.5–2.7 mm. Characters as described for T. (B.) ganeshensis  sp. n. except as follows: Eyes in lateral view slightly more elongate. Pronotum relatively wider, with basal angles subdenticulate; basal margin vaguely bordered laterally (in holotype) or almost throughout (in paratype); pronotal lateral gutter very narrow almost equal throughout (in holotype) or slightly widened in apical third (in paratype). Elytral striae smooth, not crenulate, slightly impressed along entire length; intervals with slightly more distinct microsculpture. Legs yellowish brown, with femora infuscate. Median lobe of aedeagus ( Figs 87–90View FIGURES 87 – 90) with ventral margin slightly convex in middle portion, terminal lamella angularly bent ventrad and sinuate at sides; apical capitulum oblique in lateral view, comparatively large, markedly larger than in T. (B.) ganeshensis  sp. n. and T. (B.) pusillus  sp. n., approximately equally prominent ventrally and dorsally, in caudal view apical capitulum, as in T. (B.) ganeshensis  sp. n., somewhat semi-oval, but lightly more elongate, narrowly rounded at tip ( Fig. 89View FIGURES 87 – 90). Internal sac with characteristic pattern of spiny folders in the middle portion of median lobe.

Proportions (males): PWmax/PL = 1.42–1.43; EL/EW = 1.32–1.36; EL/PL = 2.36–2.42; EW/PWmax = 1.24– 1.25; HWmax/PWmax = 0.67; HWmin/PWmax = 0.54–0.55; PWmax/PWmin = 1.23–1.25; HWmax/HWmin = 1.22–1.23.

Etymology. The specific name refers to the small size of the beetles.

Comparison. This new species is very similar in size and external morphology to T. (B.) ganeshensis  sp. n., but distinctly differs from it in the male genitalia as follows: aedeagal median lobe ( Figs 87–90View FIGURES 87 – 90) relatively smaller, with ventral margin in lateral view slightly convex in middle portion, apical capitulum much larger, approximately equally prominent ventrally and dorsally [dorsal flange of the apical capitulum in T. (B.) ganeshensis  sp. n. more prominent than ventral flange, figs. 81–82], in caudal view apical capitulum, as in T. (B.) ganeshensis  sp. n., somewhat semi-oval, but slightly more elongate, narrowly rounded at tip ( Fig. 89View FIGURES 87 – 90); internal sac with different pattern of spiny folders in the middle portion of the median lobe. Additionally, pronotum in T. (B.) minutus  sp. n. relatively wider than in T. (B.) ganeshensis  sp. n. (PWmax/PL = 1.42–1.43 versus 1.32–1.39).

Distribution ( Fig. 151View FIGURE 151, 11View FIGURES 5 – 13). Up to today only known from the mountains surrounding the Kathmandu Valley (Shivapuri Lekh, Mt. Phulchoki), at altitudes of 1750–2300 m. This species seems to be a geographical vicariant of T. (B.) ganeshensis  sp. n. which is occurs on the south-western slope of the Ganesh Himal ( Fig. 151View FIGURE 151, 10View FIGURES 5 – 13).