Trechus korae, Schmidt, 2009

Schmidt, Joachim, 2009, Taxonomic and biogeographical review of the genus Trechus Clairville, 1806, from the Tibetan Himalaya and the southern central Tibetan Plateau (Coleoptera: Carabidae: Trechini) 2178, Zootaxa 2178 (1), pp. 1-72 : 22-23

Trechus korae sp. n.

( Figs. 7 , 25 )

Type material: Holotype male, with label data “ TIBET South Centr. 22.VII.07, Medro Gonggar, Rutok Vall., 2 km SW Rutok, 5100–5250 m, 29°40’54N 92°12’24E ” ( SMNS) . Paratypes: 3 males, 2 females, with same label data as holotype ( CSCHM) .

Description: Body length: 3.4–3.7 mm.

Colour: Dorsal surface brown, moderately shiny, head in four paratype specimens somewhat darker than pronotum, three basal antennal segments, palpi and legs lighter brown.

Microsculpture: Clypeus and vertex with moderately engraved almost isodiametric meshes (x50); pronotum smooth on disc, with very faintly engraved slightly transverse meshes (x150), but with markedly engraved meshes in basal depressions (x50); disc of elytra with slightly engraved slightly transverse meshes (x80).

Head: Average sized, with small, flat eyes; temples as long as eyes, moderately wrinkled to the neck. Anterior part of frontal furrows moderately deep, posterior part flattened towards hind suborbital seta. Antennae moderately long, four antennomeres extend beyond the pronotal base. Antennomere III as long as pedicellus, and distinctly longer (approximately 1.2 times) as antennomere IV.

Pronotum: Moderately broad, subcordate, with sides strongly contracted towards base; proportions: WP/ LP = 1.24–1.30, WP/WPB = 1.32–1.40, WP/WH = 1.19–1.21, WE/WP = 1.67–1.69. Surface convex, sides evenly rounded and concave bent just anterad of hind angles, the latter well produced, almost rectangular. Marginal gutter narrow in anterior half, slightly widened towards base. Basal depressions very sparsely pointed or lengthwise wrinkled.

Elytra: Oval, broadest in or a little behind mid-length; proportion WE/LE = 1.43–1.54. Surface convex, slightly flattened on disc. Shoulders distinct but rounded. Striae faintly and sparsely punctate, inner three striae deeply impressed but +/- disappearing at base and apex, striae IV–V very faintly impressed, striae VI–VII almost completely reduced. Inner intervals I–IV slightly convex. Preapical seta is located at the end of second stria and at the beginning of the posterior elytral sixth.

Male genitalia: Aedeagal median lobe stout (LE/LA = 3.33–3.38), evenly curved downwards in middle, almost straight toward apex, seen laterally. Terminal lamella very slightly bent upwards at tip. Basal bulb relatively large. Internal sac with sclerotized portion complicatedly folded, resembling a three bladed propeller, seen laterally.

Etymology: Formed as a noun (name) in the genitive case. This new species is dedicated to Mrs. Koralie Volkmann, Bonn, Germany, for her kind assistance during my fieldwork on the Tibetan Plateau in 2007.

Identification: Within the T. wrzecionkoi group this new species is easily to recognize by the reduced outer elytral striae (VI + VII) on the one hand, and by the short aedeagal median lobe with propeller-like copulatory piece of internal sac on the other hand. For more details see diagnosis of T. martinae sp. n. below.

Relationships: At present species relationships within the T. wrzecionkoi group are unknown.

Distribution: Fig. 99 . Transhimalaya east of Lhasa: Higher mountains on southern ascent of Rutok Valley of Medrogongga County, South Central Tibet.

Habitat: Higher alpine zone; vertical distribution approximately 5100–5250 m. The specimens were found under stones on gently inclined slopes close to the top of a mountain crest.

Figures

FIGURE 99. Map of Southern Central Tibet showing distribution of species of the Trechus wrzecionkoi group (white circles), of the Trechus dacatraianus group (white squares), of the Trechus solhoeyi group (black circle), and of the Trechus chaklaensis group (black square). 1, T. wrzecionkoi Deuve, 1996. 2, T. martinae sp. n. 3, T. korae sp. n. 4, T. damchungensis Deuve, 1997. 5, T. hodeberti Deuve, 1997. 6, T. bastropi sp. n. 7, T. mieheorum sp. n. 8, T. solhoeyi sp. n. 9, T. chaklaensis sp. n.

FIGURES 2–11. Pronotum. Fig. 2, Trechus thibetanus Jeannel, 1928, Lectotype. Fig. 3, T. dongulaensis sp. n., paratype, male. Fig. 4, T. namtsoensis sp. n., paratype, male. Fig. 5, T. eutrechoides eutrechoides Deuve, 1992, non-type male specimen from Lamna La. Fig. 6, T. glabratus sp. n., paratype, male. Fig. 7, T. korae sp. n., paratype, male. Fig. 8, T. yak yak ssp. n., paratype, male. Fig. 9, T. yak shogulaensis ssp. n., paratype, male. Fig. 10, T. rolwalingensis rolwalingensis ssp. n., paratype, male. Fig. 11, T. rolwalingensis daldunglana ssp. n., paratype, male.

FIGURES 12–27. Aedeagal median lobe with sclerotized portions of internal sac in lateral view (Figs. 12–18, 23–26; Figs. 14, 17, 23, 26 in addition with parameres) and in dorsal view (Fig. 27); apical portion of the longer copulatory piece (Figs. 19–22). Fig. 12, Trechus thorongiensis Schmidt, 1994, paratype, the arrow pointed to the prolongated basal portion of the shorter copulatory piece. Fig. 13, T. eutrechoides eutrechoides Deuve, 1992, non-type specimen from Rongshar Valley. Fig. 14, T. eutrechoides mondaensis Deuve, 1997, paratype. Figs. 15, 19, T. thibetanus Jeannel, 1928, holotype. Figs. 16, 20, T. thibetanus Jeannel, 1928, non-type specimen from Kampa La. Figs. 17, 21, T. dongulaensis sp. n., paratype. Figs. 18, 22, T. namtsoensis sp. n., paratype. Fig. 23, T. glabratus sp. n., paratype. Fig. 24, T. wrzecionkoi Deuve, 1996, non-type specimen from Gyama, Chungenpo Chong side valley. Fig. 25, T. korae sp. n., paratype. Figs. 26, 27, T. martinae sp. n., paratype.