Colobostema flavimanum ( Strobl, 1898 ) Jean-Paul Haenni, 2013

Jean-Paul Haenni, 2013, A revision of the West Palaearctic species of Colobostema Enderlein, 1926 (Diptera, Scatopsidae). Part I. European subregion, Mitteilungen Der Schweizerischen Entomologischen Gesellschaft 86, pp. 199-242 : 209-211

publication ID	https://doi.org/ 10.5169/seals-403072
DOI	https://doi.org/10.5281/zenodo.6157669
persistent identifier	https://treatment.plazi.org/id/0A78FC5B-224C-580D-C4C2-07CCFB02F9C5
treatment provided by	Plazi
scientific name	Colobostema flavimanum ( Strobl, 1898 )
status	comb. nov.

Treatment

Colobostema flavimanum ( Strobl, 1898) View in CoL comb.n.

( Figs 3 View Fig. 3 A-F)

Sccitopse tristis Z. var. flavirnana Strobl 1898b : Glasn. zemalj. Mus. Bosni Herceg. 10: 592; Duda 1928: Scatopsidae, Fliegen pal. Reg. 2(1)5: 39.

Type locality. BOSN1A-HERCEGOVINA: Jablanica.

Material examined. Holotype ♂, labelled: « Sc. tristis Z. v. albimana m. Jablanica? Strobl» [in Strobl’s handwriting, green label]; labelled by me: « Scatopse tristis Z. v. flavirnana Strobl Holotype rev. Haenni 1990» / « Colobostema flavimanum (Strobl) comb.nov. Haenni 1990». Type specimen in fairly good condition, pinned, preserved in Strobl’s collection, Admont, Austria (NMBA).

Other material. FRANCE. Rhône: Charnay, jardin, Malaise trap, 1-10.VI.1997, 1 ♂, P. Withers, CPWL ( Haenni & Withers 2007). - ITALY. TO: Villar Pellice, 9-13.VII.2002, 2 ♂ ♂, G. Bächli, CGB / MHNN. - TURKEY. Zonguldak, 30 km S, 200 m, 23.VII. 1962, 1 ♂, W. Götz, MHNN.

Diagnosis. C. flavimanum is a rather isolated species, that can be easily distinguished from other species of the genus by the very peculiar shape of tergite 7 in males, with its rounded, broadly convex, posterior projection ( Fig. 3 View Fig. 3 A); genital capsule has broad, very massive, apically rounded gonocoxites with inner margin bearing spinose microtrichosity ( Fig. 3 View Fig. 3 C), also very characteristic, as is the apically contorted bifid aedeagus ( Fig. 3 View Fig. 3 D).

Description. Male. 1.9 mm; brown-black (lighter in somewhat faded type specimen), dull (except katepisternum, meron and mediotergite), with short sparse brownish pilosity, longer on tergite 7 and abdomen ventrally; base of first flagellomere slightly yellowish brown; a pair of yellow spots on notum posterior to wing base; wing membrane light brownish, more yellowish at extreme base, costa! cell and vicinity of Rs and r-m darker brown and a lighter zone between apex of R4+5 and basal angle of Mp veins brown, contrasting with membrane; halters brown black, with fulvous stem; femora brown black, tibiae mainly yellowish brown with a broad (Tl, T2) or narrow (T3) dark ring, tarsi yellowish brown.

Head with eyes nearly touching on front above antennae (distance between them about 1/2 ommatidium); antennae hardly widened toward apex, flagellomeres well separated, first longer than wide, following wider than long, last flagellomere shorter than two preceding ones together.

Thorax. Notum slightly longer than wide. Wing ( Fig. 3 View Fig. 3 F), 2.6 mm long, M1+7 slightly shorter than medial fork.

Abdomen. Pregenital segment with a complete narrow basal sclerotized ring; tergite 7 posteriorly with a broadly convex projection ( Fig. 3 View Fig. 3 A) (which is apically slightly pointed in the specimen from Bosnia-Hercegovina, while no indication of such a point is present in other known specimens); sternite 7 with posterior margin nearly straight ( Fig. 3 View Fig. 3 B); genital capsule ( Fig. 3 View Fig. 3 C) massive, with gonocoxites stout, apically rounded, spinose, microtrichosity present along inner margin, parameres long and acute apically, aedeagus enlarged and bifurcated at apex ( Fig. 3 View Fig. 3 D), epandrium with practically symmetrical posterior bifid process ( Fig. 3 View Fig. 3 E). There are other slight differences between Turkish and French specimens, i.e. gonocoxites more markedly indentated apically, posterior margin of bidentate projection more straight, but this is obviously only intraspecific variation.

Female unknown.

Taxonomic remarks. Though labelled by Strobl as var. albimana , instead of flavirnana (most probably a lapsus linguae or a collection name), there is no doubt that this unique specimen is the type of vox. flavirnana: the locality and the sketchy original description agree with it. Jablanica is the name of several localities in different parts of Yugoslavia, but the only Jablanica visited by Strobl during his entomological trip to Croatia, Dalmatia and Bosnia-Hercegovina was the locality on the river Neretva, at the railroad line between Sarajevo and Ragusa (now Dubrovnik), 81 km SW Sarajevo (Prior P. Hubl in litt.).

Distribution. Known only from four widely separated localities, namely in Bosnia-Hercegovina, France ( Haenni & Withers 2007), Italy and Turkey.

Ecology. Practically unknown, the original description specifies only that the type specimen was caught along a forest edge. The Turkish specimen was caught by means of a fruit baited trap placed for Drosophilidae on the southern slope of a valley with a little brook, in an intermixed oak-woods and agricultural landscape; the French specimen was trapped in a village garden. Flight-period is June and July.