Trechus martinae, 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 : 23-24

Trechus martinae sp. n.

( Figs. 7 , 26, 27 , 87 )

Type material: Holotype male, with label data “ TIBET (South Central) 21.VII.07, Gyama vall. ca. 60 km E Lhasa, 4900–5230 m, ca. 29°40’36N 91°35’33E ”, “north west ascent of Chungenpo Shong side vall.” ( BMNH).

Paratypes: 34 males, 17 females, with same label data as holotype ( BMNH, CKAB, CSCHM, CWR, MNHN, SMNS) .

Description: Body length: 3.4–4.0 mm.

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

Microsculpture: Disc of head with faintly engraved almost isodiametric meshes, more clearly marked on vertex (x100); pronotum with very faintly engraved slightly transverse meshes on disc (x150), but with markedly engraved meshes in basal depressions (x50). Disc of elytra with moderately engraved slightly transverse meshes (x80).

Head: Average sized, with eyes flat and relatively small; temples 4/5 to 5/6 of length of eyes, strongly wrinkled to the neck. Frontal furrows moderately deep, flattened at level of hind suborbital seta. Antennae moderately short, three antennomeres extend beyond the base of pronotum. Antennomere III as long as pedicellus or slightly longer; antennomere IV with 5/6 – 7/8 of length of antennomere III.

Pronotum: Moderately broad, subcordate, with sides strongly contracted towards base, and with proportions relatively variable: WP/LP = 1.27–1.38, WP/WPB = 1.32–1.42, WP/WH = 1.15–1.26, WE/WP = 1.61–1.68. Surface convex, sides evenly rounded in anterior ¾ to 4/5, and concave anterad of hind angles, the latter well produced, slightly obtuse (100–110°). Marginal gutter narrow, slightly widened just anterad of laterobasal depressions. Basal depressions very sparsely pointed or wrinkled lengthwise, seldom smooth.

Elytra: More slender oval, broadest at or a little behind mid-length; proportion WE/LE = 1.49–1.62. Surface convex, slightly flattened on disc. Shoulders distinct but rounded. Striae sparsely punctate, inner three or four striae deeply impressed but +/- disappearing at base and apex, outer striae shallower, striae VI–VII only slightly impressed but visible. Five or six inner intervals convex. Preapical seta is located at the end of second stria and at the beginning of the posterior elytral seventh.

Male genitalia: Aedeagal median lobe stout (LE/LA = 3.07–3.20), strongly curved downwards at the beginning of apical third. Terminal lamella slightly bent upwards at tip. Basal bulb moderately large. Internal sac with sclerotized portion large, saccate.

Etymology: Formed as a noun (name) in the genitive case. This new species is dedicated to Mrs. Martina Wegener, Lübeck, Germany, who kindly supported my fieldwork on the Tibetan Plateau in 2007.

Identification: Body size distinctly smaller than T. wrzecionkoi , with seventh elytral striae only slightly impressed, with aedeagal median lobe more strongly bent downwards and with copulatory piece distinctly larger. Eyes slightly larger than T. korae sp. n., disc of head with micromeshes shallower, frontal furrows deeper, antennae shorter, elytra on average more slender, the preapical seta on third interval is situated a little more towards apex, aedeagal median lobe distinctly larger and strongly curved only in distal third, and with internal sac more simply folded.

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

Distribution: Fig. 99 . Transhimalaya east of Lhasa: Higher mountains around Gyama Valley of Medro Gonggar County, South Central Tibet.

Habitat: Higher alpine zone; vertical distribution approximately 5100–5230 m. The specimens were found under stones on gently inclined slopes as well on 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.

FIGURES 87–92. Habitus. Fig. 87, Trechus martinae sp. n., paratype, female. Fig. 88, T. mieheorum sp. n., holotype. Fig. 89, T. solhoeyi sp. n., paratype, male. Fig. 90, T. yeti sp. n., holotype. Fig. 91, T. astrophilus sp. n., paratype, male. Fig. 92, T. tsampa sp. n., holotype.