Trichocera (Saltrichocera) sardiniensis, Petrašiūnas, Andrius, 2009

Petrašiūnas, Andrius, 2009, A new species of Trichocera Meigen (Diptera: Trichoceridae) from Sardinia, Zootaxa 2108, pp. 62-64: 62-64

publication ID 10.5281/zenodo.187804

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Trichocera (Saltrichocera) sardiniensis

sp. nov.

Trichocera (Saltrichocera) sardiniensis  sp. nov.

( Figs. 1–9View FIGURES 1 – 9)

Etymology. The species is named after the type locality – Sardinia Island, Italy.

Material examined. Holotype male, labeled „I – Sardegna (Cagliari)/ Iglesias Marganai, 700m / Plot Conecofor SAR 1 / UTM 32 S 462853 4355582 / 12.XII. 2003 – 8.I. 2004, Malaise trap/ G.Chessa legit./ Conecofor programme - CNBF “, in alcohol ( MZVU). Paratypes (5 males, 11 females): 1 male, 2 females with same data (British Museum (Natural History), London - BMNH); 1 male, 2 females with same data except „ 8–21.I. 2004 “( ISEZ); 1 male, 1 female with same data except „ 21.I – 16.II. 2004 “; 1 female with same data except „ 15–30.VI. 2004 “; 1 female with same data except „ 22.XI – 17.XII. 2004 “; 3 females with the same data except „ 1.III – 29.IV. 2005 “ (all in alcohol); 1 female in glycerol, with same data except „ 17.XII. 2004 – 04.I. 2005 “; 1 male in glycerol, with same data except „ 18.I –01.III. 2005 “; 1 male, in glycerol, labeled „I - Sardegna (Carbonia-Iglesias)/ Iglesias, Conca Margiani, radura 725m / UTM-WGS 84 32 S 0 464970 4357011 / 15.XI. 2006, retino da sfalcio/ G. Nardi leg./ Progetto Sardegna - CNBF “ (all in Museum of Zoology of Vilnius university, Vilnius, Lithuania – MZVU, if not noted otherwise).

The drawings were made by tracing the photographs.

Diagnosis. A comparatively small species. Body color brown to dark brown. Plaurae bare. First flagellomere of male antenna long-oval, slightly broader than the following ones, that of female antenna fused with the second one, producing large compound formation. R 2 + 3 + 4 shorter or sub-equal to R 2 + 3. Male IX sternite not incised medially, set with bristles all along distal margin. Male terminalia with bridge very low and broad, gonostylus parallel-sided, with very distinct tubercle at inner base. Female with slender, weakly bent ovipositor, sub-equal to 1.1 times longer than the genital segment; setulose area narrow, clearly delimited. Body length 5–6 mm, wing length 5–7 mm.

Description. Relatively small species, male body and wing size around 5 mm, female body size around 6 mm, wing size 6–7 mm. Body color brown to dark brown. Pleurae bare.

Male antenna ( Fig. 1View FIGURES 1 – 9) short, nearly reaching the abdomen. First flagellomere slightly broader than following ones; f 1 1.5–1.8 times longer than f 2 and 2.1–2.7 times longer than pedicel. Flagellomeres decrease in length from the 1 st to the 4 th one and increase in length distally starting from the 5 th one. Verticils three to four times as long as pubescence. First flagellomere has some flattened setulae (better expressed in females) near the base, visible only under high magnifications (e.g. x 40).

Female antenna ( Fig. 2View FIGURES 1 – 9) rather distinct, with f 1 and f 2 fused. The compound formation about 2.4 times as long and 2 times as broad as the third flagellomere. The latter and following segments cylindrical, increasing in length distally, with verticils two to three times as long as pubescence. Female fused element is covered with peg-like and flattened setulae ( Fig. 2View FIGURES 1 – 9), this feature being similar to that reported in T.(S.) antennata Starý  and several other species ( Starý, 1999).

Wing tinged with brownish, veins brown. Sc covered with setae all along its length both dorsally and ventrally. R 2 + 3 + 4 shorter or sub equal to R 2 + 3. Rs with numerous setae both dorsally and ventrally. Discal cell narrow, triangular in shape ( Fig. 3View FIGURES 1 – 9), 2.4–2.6 times as long as wide. Vein bM 1 + 2 almost half of mM 1 + 2. A 2 dorsally covered with macrotrichia up to the bend, and is situated close and parallel to the wing margin.

Legs. Tarsal claws ( Fig. 4View FIGURES 1 – 9) in male short and weakly curved, less than 1 / 3 of t 5. Bases of trochanters light brown, gradually darkening distally. Further parts of legs uniformly dark brown.

Hypopygium ( Fig. 5View FIGURES 1 – 9) with sternite IX with slight medial incurvation and about 8 setae along posterior margin. Gonocoxal bridge very low, broad, wide in ventral view. Gonostylus slightly longer (~ 1.3 times) than gonocoxite, parallel-sided, tip rounded, with very distinct basal tubercle. Complex of aedeagus ( Fig. 6View FIGURES 1 – 9) with parameres of moderate length, parallel in ventral view, narrow in basal part. Lateral apodemes rounded. Basal apodemes broad, parallel in ventral view. Aedeagal apodeme finger-like, rather long, ~ 1 / 4 of aedeagus.

Female ovipositor ( Fig. 7View FIGURES 1 – 9) sub-equal to slightly (~ 1.1 times) longer than genital segment, slender, almost straight. Setulose area narrow, clearly delimited, covering more than 1 / 3 the length of ovipositor. Genital plate quadrangular, with conspicuous medial incision, fork of the genital plate semicircular ( Fig. 8View FIGURES 1 – 9). Supragenital plate with acute tip and two (sometimes three) bristles. Sclerotized parts of the spermathecal ducts slightly shorter than spermathecal diameter ( Fig. 9View FIGURES 1 – 9).

Remarks. The correspondence of males to females was established by general body coloration, triangular d-cell and similar shape of tarsal claws. Moreover, only specimens of T. (S.) annulata Meigen  , T. (S.) rufescens Edwards  and T. (S.) saltator (Harris)  were present in the studied material from Sardinia and all of these species are clearly distinct from T.(S.) sardiniensis  sp. nov.

The new species resembles T. (S.) antennata  most of all by short peg-like setulae on fused and enlarged female flagellomeres and general shape of the ovipositor. First flagellomere is also quite similar in males of both species by the form and peg-like setulae. On the other hand, T.(S.) sardiniensis  sp. nov. differs from T. (S.) antennata  by the form of female genital fork and by having only two bristles on supragenital plate. It also differs by males having distinct projection at inner base of gonostyles, almost straight IX sternite, different aedeagal complex and comparatively short, less curved tarsal claws. Finally, both males and females of T. (S.) sardiniensis  sp. nov. have no setae on pleurons contrary to the state in T. (S.) antennata  .

The newly described species is also very similar to recently redescribed ( Dahl & Krzeminska, 2008) T. (S.) borealis Lackschewitz  by the general view of male and female terminalia. Males of both species have distinct basal tubercle at inner base of gonostylus, straight margin of IX sternite with setae all along it, but the gonocoxal bridge in T.(S.) sardiniensis  sp. nov. is low and broad compared to the high and narrow bridge in T. (S.) borealis  . The base of parameres in T. (S.) borealis  is wider, while basal apodemes narrower than those in T. (S.) sardiniensis  sp. nov. Male tarsal claws exceed half of fifth tarsomere in T. (S.) borealis  whilst they reach only 1 / 3 of the tarsomere in T. (S.) sardiniensis  sp. nov. The shape of the ovipositor is rather similar in females of both species. Females of T. (S.) borealis  and T. (S.) sardiniensis  sp. nov. are also similar by having two setae on supravaginal plate, but vaginal apodeme in T. (S.) borealis  has very short lateral portions compared to longer and parallel lateral portions in T. (S.) sardiniensis  sp. nov.


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