Leptospina subdentata

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Taxonavigation

Ordo: Diptera
Familia: Sciaridae
Genus: Leptospina

Name

Leptospina subdentata (Mohrig & Menzel, 1992) – Wikispecies link – ZooBank link

  • Trichosia (Leptosciarella) subdentata Mohrig & Menzel, 1992[1]: 19-20, fig. 2
  • Leptosciarella (Leptospina) subdentata (Mohrig & Menzel, 1997)[2]: 86-87, fig. 37

Type material

Holotype: ♂, 14.04.1965, leg. Jukawa, PWMP 4025.

Type locality

Japan, Kyushu, Fukuoka-shi

Description (male)

Head. Eye bridge 3 rows of facets. LW-index of 4th antennal flagellar segment 2.8–3.2; neck 0.37–0.48 of segment width; Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal hairs shorter than segment width; dense; salient. Palps darkened; normal; palpomeres 3. First palpomere of normal shape; with 3–4 bristles; with only some sparse sensillae. Second palpomere shortly oval. Third palpomere as long as first segment. Thorax. Colour brown, or bright brown. Notum unicolour. Thoracic setae normal; dark. Mesonotum with some weaker central bristles. Posterior pronotum setose. Postpronotal setae 2. Mesothoracic sclerites bare. Legs. Colour yellow-brown. Hind coxae of same colour as femora. Hairs on fore coxae bright. Front tibia apically with a patch of setae. Front tibial organ dark. Front tibial organ not bordered. Tibial setae on hind legs normal, shorter than tibial width. Tibial spurs of equal length. Claws untoothed. Wings. Wings slightly darkened; of normal shape, or reduced, with weakly developed anal lobe. Wing membrane without macrotrichia. Wing venation weak, with faint m-base. M-fork of normal shape. R1 inserting at or slightly before base of m-fork; posterior veins bare; bM bare; r-m with a few setae, or mostly setose; bM:r-M 0.9–1.1; st-Cu:bM 0.25–0.4; r1:r 1.15–1.35; C:w 0.5–0.62. Halteres dark; of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally dark, or of different colour. Hypopygium concolour with abdomen; 0.6–0.8 × longer than wide. Base of gonocoxites with normal, weak hairs; gonocoxites forming an inverse V; inner margin of gonocoxites normally U-shaped; inner membrane of hypopygium scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 1.75–1.97 × longer than wide; Inner margin straight; apex with one obtuse angle. Apical tooth present; 2.65–3 × longer than broad; strong. Awl-like setae long; on inner side of gonostyles absent. Megasetae on inner part of gonostylus absent. Whiplash-hair absent. Tegmen 0.4–0.7 × longer than broad; equally rounded, or trapezoid; normal; Central process absent. Length of aedeagus/hypopygium 14–24 %; Aeadeagal apical structure present. Measurements. Body size 2.3–3 mm. Hind tibia 1–1.2 mm. Wing length 2.3–2.7 mm.

Diagnosis

Leptospina subdentata is characterized by the non-setose posterior wing veins, slightly reduced wings and long awl-like setae dorsally of the long apical tooth. Those setae are shorter than in Leptospina dentata and Leptospina lobodentata, which can also be distinguished by the bright abdominal hairs. Le. subdentata is otherwise similar to Leptospina atricha, which can be distinguished by the more tapered gonostyles and the presence of awl-like setae below the apical tooth.

DNA Barcoding

The COI sequence is assigned to BIN BOLD:ACD6177 (n=1, K2P: 9.15%).

Discussion

Le. subdentata is poorly known. Together with Le. dentata and Le. lobodentata it belongs to a group of species from Eastern Palearctic Region. The variability of this and possibly other related species is unknown. This species is smaller than other members of Leptospina, the specimens from Korea being still smaller (Shin, 2013[3]: 93, fig. 44) has a tendency to wing reduction.

Etymology

lat. sub- = under, dens = tooth; making reference to the lobe and the tooth-like elongated setae on the gonostyles and the similarity with Le. dentata.

Ecology

The species is probably wood inhabiting and has been bred from logs used for a Shiitake fungus culture (Shin, 2013[3]: 93, fig. 44)

Distribution

Korea[3], Japan[2].

Images

Figure 1. Leptospina subdentata male, habitus, scale 1 mm
Figure 1. Leptospina subdentata male, habitus, scale 1 mm 
Figure 2. Leptospina subdentata male, hypopygium, scale 0.1 mm
Figure 2. Leptospina subdentata male, hypopygium, scale 0.1 mm 
Figure 3. Leptospina subdentata male, gonostylus (ventral view), scale 0.1 mm
Figure 3. Leptospina subdentata male, gonostylus (ventral view), scale 0.1 mm 
Figure 4. Leptospina subdentata male, gonostylus (dorsal view), scale 0.1 mm
Figure 4. Leptospina subdentata male, gonostylus (dorsal view), scale 0.1 mm 
Figure 5. Leptospina subdentata male, aedeagal complex, scale 0.1 mm
Figure 5. Leptospina subdentata male, aedeagal complex, scale 0.1 mm 
Figure 6. Leptospina subdentata male, 4th antennal flagellar segment, scale 0.1 mm
Figure 6. Leptospina subdentata male, 4th antennal flagellar segment, scale 0.1 mm 
Figure 7. Leptospina subdentata male, palpus, scale 0.1 mm
Figure 7. Leptospina subdentata male, palpus, scale 0.1 mm 
Figure 8. Leptospina subdentata male, wing, scale 1 mm
Figure 8. Leptospina subdentata male, wing, scale 1 mm 

References

  1. ↑ Mohrig, W.; Menzel, F.; Kozánek, M. 1992: Neue Trauermücken (Diptera, Sciaridae) aus Nord-Korea und Japan. Dipterological Research, 3, 17–32.
  2. ↑ 2.0 2.1 Mohrig, W.; Menzel, F. 1997: Revision der paläarktischen Arten von Trichosia Winnertz sensu Tuomikoski, 1960 (Diptera, Sciaridae). – Teil II. Gattungen Leptosciarella Tuomikoski, 1960 und Trichodapus gen. nov. Studia dipterologica, 4(1), 41–98.
  3. ↑ 3.0 3.1 3.2 Shin, S. 2013, February: Systematic study of Sciaridae (Diptera: Sciaroidea) in the Korean Penisula, with discussion of Larval habitats evolution. Dissertation, Seoul National University, Seoul.
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