Trichosiopsis neomelanoma
Ordo: Diptera
Familia: Sciaridae
Genus: Trichosiopsis
Name
Trichosiopsis neomelanoma unpublished
Type material
Holotype: ♂, 5.7.–15.7.2013, Malaise Trap, leg. F. Tremblay, BIOUG11861-G05 in BIOUG
Type locality
Canada, Quebec, Forillon National Park, trail off of park compound (i.e. operation centre), 1501 boul. Forillon, 48.857 N, 64.376 W
DNA barcoded material
| Stadium | Country | Province | Locality | Habitat | Method | Date | Collector | Collection Number | Collection | Latitude | Longitude | Elevation (m) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 ♂ (holotype) | Canada | Quebec | Forillon National Park, trail off of park compound (i.e. operation centre), 1501 boul. Forillon | Malaise Trap | 5.7.–15.7.2013 | F. Tremblay | BIOUG11861-G05 | BIOUG | 48.857 | -64.376 | 135 | |
| 1 ♂ | Canada | Nova Scotia | Kejimkujik National Park, S of Big Dam Lake | Malaise Trap | 16.6.–22.6.2013 | BIObus 2013 | BIOUG15690-A01 | BIOUG | 44.443 | -65.265 | 129 | |
| 1 ♀ | Canada | Newfoundland and Labrador | Gros Morne National Park, James Callaghan Trail (aka Gros Morne Trail) | Malaise Trap | 22.6.–2.7.2013 | R. Reid | BIOUG09779-A02 | BIOUG | 49.5686 | -57.8302 | 39 |
Description (male)
Head. Eye bridge 2–3 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; with 3–4 setae; with only sparse sensilla. Second palpomere short and oval. Third palpomere as long as first. Thorax. Colour brown. Notum unicolour. Thoracic setae normal; brown. Posterior pronotum setose. Postpronotal setae 2–3; strong. Mesothoracic sclerites bare. Legs. Colour brown. Hind coxa of same colour as femora. Setae on front coxa black. Front tibial organ as patch of setae; dark; 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; with weakly developed anal lobe. 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 with a few macrotrichia; CuA1 and CuA2 mostly with macrotrichia; bM bare; r-m with few setae; bM:r-M 1.05–1.21; st-Cu:bM 0.4–0.5; R1:R 1.09–1.25; c:w 0.71–0.8. Halter darkened; of normal length. Abdomen. Abdominal setae strong; dense; on tergites black; on sternites black. Hypopygium concolour with abdomen; LW-index 0.6–0.7. Base of gonocoxites with weak setae; gonocoxites broadly separated, or narrowly 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 1.91–2.15; Inner margin straight; apex equally rounded. Apical tooth present; without internal structure; of medium strength; LW-Index 2–3. Awl-like setae normal; present beneath apical tooth. Megasetae absent. Whiplash-hair absent. Tegmen 0.65–0.8 × longer than broad; rectangular with rounded edges; without special features; central process absent. Length of ejaculatory apodeme/hypopygium 15–25 %. Field with aedeagal teeth inconspicuous. Measurements. Body size 2.7–3.1 mm. Hind tibia 1.26–1.36 mm. Wing length 2.3–2.7 mm.
Diagnosis
This small species is peculiar by the reduced wings. The new 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 general appearance of the gonostylus is like in Trichosiopsis melanosoma, but the species is notably smaller.
DNA Barcoding
The COI sequence is assigned to BIN BOLD:ACL3019 (average distance 0.11%, n=3, max. 0.16%, K2P: 9.00%).
Discussion
Trichosiopsis neomelanoma is a small species and also shows wing reduction. Morphologically by the presence of a dorsal bulge at the apex of the gonostylus and also genetically the new species fits into the complex of Tr. melanoma and seems to be a Nearctic offshoot of this mainly Palaearctic clade.
Etymology
The greek prefix neo- was added to melanoma, because this is the first proven Nearctic species in the Tr. melanoma complex.
Distribution
Canada (Newfoundland and Labrador, Nova Scotia, Quebec)
Images
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