Trichosiopsis melanosoma
Ordo: Diptera
Familia: Sciaridae
Genus: Trichosiopsis
Name
Trichosiopsis melanosoma unpublished
Type material
Holotype: ♂, 02.07.2013, leg. Haseke, ZFMK-TIS-2567122 in ZFMK
Type locality
Germany, Bavaria, Nationalpark Berchtesgadener Land, Sommerbichel, Quellgebiet N Herrenroint, unterer Quellbach, 47.5806 N, 12.975 E
Description (male)
Head. Eye bridge 4 rows of facets. Antenna unicolour. Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal setae of normal strength. Palpus darkened; of normal length; palpomeres 3. First palpomere of normal shape, or elongate; with 4–5 setae; with only sparse sensilla. Second palpomere short and oval. Third palpomere as long as first. Thorax. Colour brown. Notum unicolour. Thoracic setae normal. Posterior pronotum setose. Postpronotal setae 2; fine. Mesothoracic sclerites bare. Legs. Colour yellow-brown. Hind coxa darkened. Setae on front coxa darkened. Front tibial organ as patch of setae; front tibial organ not bordered. Tibial setae on hind legs normal, shorter than tibial width. Tibial spurs of equal length. Claws untoothed. Wing. Wing slightly darkened; of normal shape. Wing membrane without macrotrichia. Wing venation weak, with faint stM. M-fork of normal shape. R1 ending at or slightly before base of m-fork; posterior veins with macrotrichia; stM mostly with macrotrichia, or with a few macrotrichia; CuA1 and CuA2 mostly with macrotrichia; bM bare; r-m mostly setose; bM:r-M 1–1.2; st-Cu:bM 0.4–0.5. Halter darkened; of normal length. Abdomen. Abdominal setae strong; dense; on tergites black; on sternites black. Hypopygium concolour with abdomen; LW-index 0.6–0.75. Base of gonocoxites with weak setae; gonocoxites broadly separated; inner margin of gonocoxites typically U-shaped; inner membrane of hypopygium scarcely setose; ventral margin of gonocoxite with short setae. Gonostylus elongate; LW-index 2.15–2.4; Inner margin concave; apex equally rounded. Apical tooth present; without internal structure; of medium strength, or weak; LW-Index 2–2.7. Awl-like setae normal; present beneath apical tooth. Megasetae absent. Whiplash-hair absent. Tegmen 0.6–0.8 × longer than broad; rectangular with rounded edges; without special features; central process absent. Length of ejaculatory apodeme/hypopygium 26–36 %; base of ejaculatory apodeme absent. Field with aedeagal teeth inconspicuous. Measurements. Body size 2.8–3.3 mm. Wing length 2.8–3.5 mm.
Diagnosis
Trichosiopsis melanopilosa species is placed in the Trichosiopsis pilosa group by the presence of short setae at the base of the gonocoxites and a not very strong apical tooth, which is partially covered by a dorsal bulge. The species is similar to Trichosiopsis melanopilosa, but has a shorter and thicker gonostylus.
DNA Barcoding
The COI sequence is assigned to BIN BOLD:ADG4438 (n=1, K2P: 7.22%)
Discussion
Trichosiopsis melanosoma is only known by a single specimen from the Austrian Alps, which is in not very good condition. Legs, antennae and great parts of the wing are lacking. However, the K2P distance of more than 7% indicates its validity as a distinct species. The nearest neighbour is Tr. melanopilosa, which is also morphologically similar. The alpine environment probably still hosts more species of the Tr. pilosa complex.
Etymology
The name was coined as being similar to melanoma because of its phylogenetic position.
Ecology
Tr. melanoma appears to be an alpine species, as the only known record is above 1,000 m.
Distribution
Germany.
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