Trichosiopsis renati

Taxonavigation

Ordo: Diptera
Familia: Sciaridae
Genus: Trichosiopsis

Name

Trichosiopsis renati unpublished

Type material

Holotype: ♂, 21.04.2013, Sweep netting, leg. Heller, ZFMK-TIS-14870 in ZFMK

Type locality

Germany, Schleswig-Holstein, Bilsen, Bilsener Wohld

Barcoded material

Stadium	Country	Province	Locality	Habitat	Method	Date	Collector	Collection Number	Collection	Latitude	Longitude	Elevation (m)
1 ♂ (holotype)	Germany	Schleswig-Holstein	Bilsen, Bilsener Wohld	mixed forest	Sweep netting	21.04.2013	Kai Heller	ZFMK-TIS-14870	ZFMK	53.7511111	9.88388889	29
1 ♂	Norway	Vestfold	Larvik, Kvelde, Outside Brankollåna National Reserve		Sweep netting	19.05.2005	Jostein Kjærandsen	ZFMK-TIS-2520571	ZFMK	59.2080556	10.1008333	120
1 ♂	Norway	Akershus	Nesodden, Flatebybråten		Malaise trap	9.4.–9.5.2014	O.J. Lønnve	bf-sci-00232	NHMO	59.8130647	10.628449
1 ♂	Norway	Akershus	Nesodden, Flatebybråten		Malaise trap	6.4.–9.5.2014	O.J. Lønnve	bf-sci-00249	NHMO	59.8122733	10.624898	130
1 ♀	Norway	Telemark	Porsgrunn, Åsstranda		Malaise trap	28.4.–24.5.2010	Geir Søli	bf-sci-01323	NHMO	59.0937329	9.6471885
1 ♂	Norway	Telemark	Tokke, Magebekken		Malaise trap	09.05.2015	Kjell-Magne Olsen	bf-sci-01600	NHMO	59.4193	8.21479	95
1 ♂	Norway	Sør Trøndelag	Klæbu, Selbusjøen near Bjørkly		Malaise trap	7.5.–22.5.2014	Elisabeth Stur	TRD-Sci062	NTNU	63.274	10.561	157

Other material studied

Germany: 2 ♂, Baden-Württemberg, Bad Rotenfels, Bannwald Birkenkopf, Malaise trap, Doczkal, 3.4.-03.05.2003, PKHH 5067/2068; 1 ♂, Mecklenburg-Vorpommern, Rosenthal b. Strasburg, Buchenwald, sweep netting, Jaschhof, 23.04.1994, PKHH 5319; 1 ♂, Rhineland-Palatinate, Kirchheimbolanden, NSG Albertskreuz, Malaise trap, Doczkal, 11.4.-02.05.2002, PKHH 5093; 3 ♂, Schleswig-Holstein, Blumenthal, Holzprobe: Fichte, Eiche, Buche Erle, photoeclector, Arp, 17.3.-10.04.2000, PKHH 3217-3219; 1 ♂, Kiel-Universität, Gartengelände, Malaise trap, Heller, 23.-30.03.1995, PKHH 967; 1 ♂, Trent, Trentmoor, Malaise trap, Kassebeer, 9.-16.04.1994, PKHH 730; Italy: 1 ♂, South Tyrol, Stilfzer Joch NP, Suldental bei Schmelz, montaner Fichtenwald, Malaise trap, Lange & Ziegler, 17.-21.05.2005, SDEI 2479; Norway: 2 ♂, Kvelde, Outside Brånakollana Nat. Res., sweep netting, Kjærandsen, 19.05.2005, PKHH 8362; 3 ♂, Oslo, Gaustad, Malaise trap, Olsen, 1.-30.05.2013, PKHH 8608; Sweden: 5 ♂, Bohuslän, Ödsmal, Hällsberget, broad leaved deciduous forest, Malaise trap, Swedish Malaise Trap Project, 24.4.-25.05.2004, PKHH 7365, NHRS 4547; 1 ♂, Skåne, Simrishamn, Stenshuvud National Park: Svabeholmsskog, hornbeam forest, Malaise trap, Swedish Malaise Trap Project, 22.5.-20.06.2005, PKHH 7241; 5 ♂, Småland, Bäckebo, Grytsjöns naturreservat, Old aspen forest in boulder terrain, Malaise trap, Swedish Malaise Trap Project, 21.4.-18.05.2006, PKHH 7312/7319, NHRS 3028; 3 ♂, Grytsjöns naturreservat, Old moisty haymaking meadow in forest edge, Malaise trap, Swedish Malaise Trap, PKHH 7324, NHRS 3031; Switzerland: 2 ♂ Zurich, Sihlwald, window trap, Schiegg, 25.4.-11.05.1996, PKHH 1607/1565.

Description (male)

Head. Eye bridge 5–6 rows of facets. Antenna unicolour. LW-index of 4^th flagellomere 2.6–2.8; neck 0.15–0.3 × segment width; transition of basal part to neck pronounced. Colour of neck unicolour. Antennal setae shorter than segment width; of normal strength; dense; salient. Palpus darkened; short, or of normal length; palpomeres 3. First palpomere thickened; with 6–10 setae; with only sparse sensilla. Second palpomere short and oval. Third palpomere as long as first. Thorax. Colour dark brown, or brown. Notum unicolour. Thoracic setae long and strong; black. Posterior pronotum bare. Mesothoracic sclerites bare. Legs. Colour yellow, or yellow-brown. Hind coxa darkened. Setae on front coxa pale. Front tibial organ as patch of setae; dark; front tibial organ not bordered. Tibial setae on hind legs weak and inconspicuous. 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 0.8–1; st-Cu:bM 0.65–0.9; R₁:R 1.5–1.9; c:w 0.6–0.75. Halter pale; of normal length. Abdomen. Abdominal setae strong; 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; inner margin of gonocoxites typically U-shaped, or broadly extended; inner membrane of hypopygium scarcely setose; ventral margin of gonocoxite with short setae. Gonostylus elongate; LW-index 1.8–2.1; Inner margin straight, or concave; apex with two obtuse angles. Apical tooth present; without internal structure; of medium strength; LW-Index 1.9–2.3. Awl-like setae normal; present beneath apical tooth. Megasetae absent. Whiplash-hair absent. Tegmen 0.5–0.7 × longer than broad; rectangular with rounded edges; without special features; central process absent. Length of ejaculatory apodeme/hypopygium 25–38 %; base of ejaculatory apodeme present. Field with aedeagal teeth inconspicuous. Measurements. Body size 4–4.8 mm. Hind tibia 1.75–2 mm. Wing length 3.2–3.8 mm.

Diagnosis

Trichosiopsis renati is most similar to Trichosiopsis viatica. It belongs to the species of the viatica complex with a thickened gonostylus and is well characterized by the cup-shaped first palp segment, the bright halteres (in the typical form) and the darkened wing veins. It is also quite peculiar by the U-shaped notch with with fine white setae at the base of the hypopgium. In contrast to Le. viatica it has a bi-angulate gonostylus and a bare posterior pronotum. By the shape of the gonostylus the new species resembles Trichosiopsis subpilosa, but that species can be distinguished by the lobe-like intercoxal structure with a dense set of hairs.

DNA Barcoding

The COI sequence is assigned to BIN BOLD:ACM3742 (average distance 0.00%, max. 0.00%, n=12, K2P: 11.08%).

Etymology

The species name renati is derived from the Latin name “Renatus” and is dedicated to René Eckert, Kai Heller´s colleague at comdirect bank.

Ecology

Tr. renati belongs Together with Tr. viatica and Trichosiopsis dimera, to a complex of species, which appear very early in the spring and are probably strictly inhabiting rotten wood as larvae.

Discussion

Trichosiopsis renati appears in two different forms, the typical one being larger and having bright halteres and setae on the fore coxae. The abdominal patches are more distinctive than in other species of the genus. The variant form represented by the specimens from Småland, Sweden and from Norway is smaller, has darker halteres and legs and mostly also darkened setae at the fore coxae. The gonostylus is of the same shape as in the typical form, only a little more slender and reminding of Trichosiopsis soror. The U-shaped intercoxal structure the base of the hypopygium with bright setae on each side is not so distinct, neither are the abdominal spiracles. To date and very unusually no genetic differences at all could be observed, so both variants are considered to belong to the same species.

The nearest neighbour of this species on BOLD is Trichosiopsis tuberculigera, the type species of the genus. This is a clear indication, that Tr. tuberculigera despite of its extremely modified gonostylus is otherwise quite close to the rest of the species and does not have an isolated position.