Tricimba atipica RAILE RICCARDI 2024, sp. nov.
Creators: name: RAILE RICCARDI, PAULA
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chloropidae
Tricimba
Tricimba atipica

description: Tricimba atipica Riccardi sp. nov. (Figs. 1F–L)
urn:lsid:zoobank.org:act:3DBD1440-4D1F-4809-AF3C-1213E2EAB31E
Barcode accession numbers: OR049144, OR050234, OR050238, OR050239, OR050240, OR049518, OR049901, OR049612.
Holotype. ♂, SWEDEN, Småland, Högsby kommun, Hornsö kronopark, birch fen, 57.006550, 16.109350 (=Trap ID 18), 10.vi-20.vi.2004 (=coll. event ID 339), Leg. Swedish Malaise Trap Project, (code PR0001016; OR049144) [SMNH].
Paratypes. same data as holotype except; 1 ♀, Västmanland, Sala kommun, Västerfärnebo, Nötmyran, Islingby, Hay meadow. 59.941959, 16.309450 (=Trap ID 11), 16.vi–09.vii.2004 (=coll. event ID 881), (PR0000659; OR050234) [SMNH]; 1 ♂, Ångermanland, Örnsköldsviks kommun, Skuleskogen, Långrå, Brook ravine in mixed forest. 63.088717, 18498383(=Trap ID 44), 16.vi–05.vii.2004 (=coll. event ID 1185), (PR0002569; OR050238) [SMNH]; 1 ♀, Ångermanland, Örnsköldsviks kommun, Skuleskogen, Långrå, Brook ravine in mixed forest. 63.088717, 18498383(=Trap ID 44), 05.vii–25.vii.2004 (=coll. event ID 1186), (PR0002571; OR050239) [SMNH]; 2 ♀♀, Ångermanland, Örnsköldsviks kommun, Skuleskogen, Långrå, Brook ravine in mixed forest. 63.088717, 18498383(=Trap ID 44), 25.vii–09.viii.2004 (=coll. event ID 1187), (PR0002573; OR050240) (PR0002574; OR049518) [SMNH]; 1 ♂, Ångermanland, Örnsköldsviks kommun, Skuleskogen, Långrå, Brook ravine in mixed forest. 63.088717, 18498383(=Trap ID 44), 09.viii–23.viii.2004 (=coll. event ID 1188), (PR0002576; OR049901) [MfN]; 1 ♀, Västerbotten, Vindelns kommun, Svartbergets försökspark Åheden, Svartberget, 64.230517, 19.785100 (=Trap ID 61), 28.v–18.vi.2004 (=coll. event ID 763), (PR0002738; OR049612) [SMNH].
Etymology. The specific epithet ‘atipica’ refers to the absence of longitudinal grooves on scutum, the most striking diagnostic feature of this species within Tricimba.
Morphological diagnosis. Ocellar triangle completely pruinose; gena narrow, yellow; scutum with yellow to light brown pilosity, two longitudinal grooves barely noticeable; apical scutellars not approximated; legs dark yellow; male cercus wider than long in terminal view; distiphallus long; phallapodeme with long bifid apical arms, base bent ventrally.
Molecular diagnosis. 25: T, 28: A, 46: A, 56: T, 58: A, 133: A, 154: T, 197: T, 199: A, 265: T.
Description. Body length 1.33–1.36 mm; wing length 1.5 mm. Male. Colour background brown with grey pruinosity.
Head. Frons dark yellow apically; ocellar triangle black, completely pruinose, reaching half of the frons length; gena narrow, yellow; eye with short and sparse pilosity; postpedicel round, brown; arista dark, with short pubescence; 6 fronto-orbital setae; postocellar setae cruciate. Thorax. Scutum with yellow to light brown pilosity, two longitudinal grooves barely noticeable; pleuron pruinose on the upper half; 1+2 notopleural setae; apical scutellar setae not approximated, about as long as scutellum; one pair of lateral scutellar setae. Wing. First and second wing sectors about the same length; R 4+5 and M 1 subparallel; r-m and dm-m divergent, distant from each other about 2x dm-m length; legs entirely dark yellow; tibial organ brown, short oval, as long as 1/3 of hind tibia. Abdomen. Tergites brown. Epandrium wider than long; surstylus conical, with a row of long setae in the ventral base; male cercus wider than long in terminal view, with a triangular connection between the cerci; pre- and postgonites fused; distiphallus long, over two times the length of basiphallus; phallapodemic sclerite indistinct; phallapodeme with long bifid apical arms, base bent ventrally. Female. Similar to male, with cerci regular, brown with pale pilosity.
Comments. The diagnostic features of T. atipica sp. nov. do not correspond to any described species of Tricimba outlined by Dely-Drascovits (1983), nor Tricimba and Conioscinella Duda, 1929 species in Nartshuk and Andersson (2013). Therefore, it is considered here as a new species. The new species shows overall similarity with T. cincta (Meigen, 1830), except for having only one pair of lateral scutellars (three pairs of lateral scutellars in T. cincta), apical scutellars not approximated (approximated in T. cincta), scutal longitudinal grooves almost indistinct (three distinct grooves in T. cincta), and ocellar triangle at least reaching half of the frons length (shorter in T. cincta). In Nartshuk & Andersson (2013) key to Tricimba species, the couplet 2 (p. 151) is modified to include the new species (see below).
description: Published as part of RAILE RICCARDI, PAULA, 2024, Two new species of grass flies (Diptera, Chloropidae) from Sweden, pp. 29-33 in Journal of Insect Biodiversity 48 (1) on pages 31-32, DOI: 10.12976/jib/2024.48.1.4, http://zenodo.org/record/15306540