Trichocera (Saltrichocera) latipons, Podenas, 2017

Petrašiūnas, Andrius & Podenas, Sigitas, 2017, New data on winter crane flies (Diptera: Trichoceridae) of Korea with description of a new species, Zootaxa 4311 (4), pp. 561-575 : 564-565

Trichocera (Saltrichocera) latipons sp. nov.

( Figs. 8 , 26–30 )

Diagnosis. Medium-sized species, body length 6–7 mm, wing length 7–8 mm. Body coloration brown. Antennal segments with short pubescence. Metepisternum bare or with single setae. Male terminalia with gonocoxal bridge low and very wide, with a membraneous ventral flange; both halves touching in the middle at a narrow point. Gonostylus slightly bent inwards, parallel-sided, without tubercle, apex rounded. Ninth sternite with a very slight indentation towards the middle ( Figs. 26, 27 ).

Material examined ( Fig. 33 ): Type specimens 6 males.

Holotype: male (in ethanol) Gyeonggi-do, Gapyeong-gun, Buk-myeon, Jeokmok-ri , Garimgyo (Br.) GREC, 25.10.2015 at light, 12 PM, coll. Y.- J. Bae (KU).

Paratypes: 5 males, topotypic (KU).

Description. General coloration brownish, slightly lighter on abdomen, darker on thorax. Antennae ( Fig. 30 ). first flagellomere (f1) slender, about 1.3–1.5 times longer than second flagellomere (f2). Verticils not outstanding, slightly longer than general pubescence.

Thorax. Single seta on metepisternum observed in one paratype, otherwise pleura bare.

Wing ( Fig. 8 ). Wings lightly brownish, not hyaline. Vein R2+3+4 is two to three times as long as R3+4. A2 bare, all other veins with setae on both sides.

Legs ( Fig. 29 ). Male tarsal claw approximately twice as short as the fifth tarsomere.

Male terminalia ( Figs. 26–28 ). Gonocoxal bridge low and wide, touching in the middle at a narrow point; ventrobasal lobe has membraneous flange along the inner margin. In two paratypes this lower flange is less sclerotized, better visible in lateral view. Gonostylus slightly bent inwards, parallel-sided, apex rounded. Basal tubercle absent. Ninth sternite medium wide, with a slight indentation towards the middle, with about 10 setae, longer ones reaching the gonocoxal bridge. In aedeagal complex parameres long, with hood hidden in between and only slightly visible in lateral view, aedeagal apodeme rather wide, rectangular, black. Lateral apodeme narrow and elongated.

Notes. The newly described species has similarities with several species from Europe, namely T. (S.) hirta Starý & Martinovský, 1996 and T. (S.) pubescens Starý & Martinovský, 1996 . Also, those specimens of T. (S.) latipons , that have gonocoxal bridge with membraneous flange on ventrobasal lobe less sclerotized, look similar to Trichocera (Saltrichocera) nordica Krzemińska & Gorzka, 2014 .

Contrary to T. (S.) hirta and T. (S.) pubescens , which have numerous long and rather stiff setae on both epimeron and metepisternum ( Starý & Martinovský 1996), only one specimen of T. (S.) latipons has only single seta on metepisternum. Antennae of T. (S.) latipons reach the middle of the first abdominal segment and are not as long as in T. (S.) hirta and T. (S.) pubescens . T. (S.) latipons does not have elongate, erect verticils as in these other two species, though it’s antennae are generally pubescent. Wing vein R2+3+4 is two to three times as long as R3+ 4 in T. (S.) latipons , while in T. (S.) hirta and T. (S.) pubescens R2+3+4 is half as long or sub-equal in length to R2+3.

Male genitalic structures of T. (S.) hirta and T. (S.) latipons are similar in several aspects: the bridge is rather low, ventrobasal lobe has membraneous flange along inner margin, ninth sternite without deep excision and has setae all along posterior margin, lateral apodemes are narrow and elongated in both of these species. However, T. (S.) hirta has gonostylus conspicuously curved inwardly in hook-like manner before broadly rounded apex ( Starý & Martinovský 1996, Fig. 19 ), but in T. (S.) latipons gonostylus is not curved as that and is slightly bent inwards along the whole length. Moreover, paramere is comparatively short and very broad proximally, and aedeagal apodeme is pale and short, narrow laterally in T. (S.) hirta while paramere in T. (S.) latipons is long and equally narrow along it’s length and aedeagal apodeme is black, rectangular and rather wide.The general view of male genitalia is similar in the newly described species (in specimens with membraneous flange on ventrobasal lobe of gonocoxites less sclerotized) compared to T. (S.) nordica , but gonostyli are slightly more curved medially in T. (S.) latipons compared to almost straight in T. (S.) nordica . Lateral apodemes of aedeagal complex in T. (S.) latipons are longer and more oval compared to those in T. (S.) nordica . Antennal flagellomeres are similar in size and form in both of these species, but the general pubescence is not that dense in T. (S.) latipons as in T. (S.) nordica . Male hind tarsal claws are longer in T. (S.) latipons , reaching about half of the length of the fifth tarsomere, while they are only 1/3 of the fifth tarsomere in males of T. (S.) nordica .

Etymology. The name of the species refers to its wide gonocoxal bridge (latus = wide, pons = bridge) and is a noun in the nominative singular, standing in apposition to the generic name.

Figures

FIGURES 1 – 9. Wings of: 1. Trichocera (Saltrichocera) sapporensis holotype, Japan, Sapporo, Sept. 1922, male (USNM); 2. T. (S.) maculipennis punctipennis S. Korea, Odaesan NP, 30.10 – 28.11.2013, male (NIBR); 3. T. (S.) maculipennis punctipennis S. Korea, Odaesan NP, 30.10 – 28.11.2013, female (NIBR); 4. T. (S.) maculipennis pictipennis Russia, Sidemi, 0 7.10. 1897, female (ZIN); 5. T. (S.) punctipennis India, Simla Hills, 25.04. 1907, male (BMNH) (part of the abdomen is visible through the basis of the wing); 6. T. (S.) punctipennis (Brunetti, 1912); 7. T. (T.) tuberculifera allotype, N. Korea, Seren Mts., 0 3.10. 1937, female (USNM); 8. T. (S.) latipons sp. nov., paratype, S. Korea, Gyeonggi-do, Jeokmok-ri, 25.10. 2015, male (KU); Male terminalia: 9. Paracladura rasnitsyni, North Korea, Ompo, 28.05. 1938, dorsal and lateral view with long hook-like parameres (USNM). Scale bar = 0.2 mm. Abbreviation: p—parameres.

FIGURES 20 – 30. 20. T. (T.) sakaguchii North Korea, Ompo, 0 3.11. 1937, male terminalia (USNM); 21. T. (M.) latilobata, male terminalia (from Alexander, 1938). 22. T. (S.) regelationis S. Korea, Gangwon-do Province, Jeokmok-ri, 0 2.01. 2015, male terminalia (KU); 23. T. (S.) sparsa S. Korea, Odaesan NP, 30.10 – 28.11.2013, male terminalia (NIBR); 24. T. (T.) sibirica North Korea, Seren Mountains, 0 3.10. 1937, male terminalia (USNM); 25. T. (T.) mirabilis N. Korea, Ompo, 0 5.11. 1937, male terminalia (USNM). Trichocera (Saltrichocera) latipons sp. nov. paratype male, S. Korea, Gyeonggi-do, Jeokmok-ri, 25.10. 2015 (KU): 26 – 27. Male terminalia; 28. Aedeagal complex, lateral view; 29. Tarsus with a claw; 30. Antennae, basal flagellomeres. Scale bar = 0.2 mm. Abbreviation: b—gonocoxal bridge.

FIGURES 31 – 42. Collecting sites of Trichoceridae in Korean Peninsula. 31. Paracladura rasnitsyni; 32. T. (M.) latilobata; 33. T. (S.) latipons sp. nov.; 34. T. (S.) regelationis; 35. T. (S.) sparsa; 36. T. (S.) maculipennis punctipennis; 37. T. (T.) hiemalis; 38. T. (T.) major; 39. T. (T.) mirabilis; 40. T. (T.) sakaguchii; 41. T. (T.) sibirica; 42. T. (T.) tuberculifera.

FIGURES 10 – 19. 10. T (S.) sapporensis holotype, Japan, Sapporo, Sept. 1922, male terminalia (USNM); 11. T. (S.) maculipennis punctipennis S. Korea, Odaesan NP, 30.10 – 28.11.2013, male terminalia (NIBR). 12. T. (S.) punctipennis India, Naini Tal., 0 1.03. 1934, Brit. Mus. 1934 – 263, male terminalia (BMNH). 13. T. (S.) punctipennis India, Naini Tal., 15.02. 1934, Brit. Mus. 1934 – 143, female terminalia (BMNH). Trichocera (T.) tuberculifera: 14 Allotype, female terminalia, 15 – 17 Holotype # 6549 male, N. Korea, Seren Mts., 0 3.10. 1937 (USNM); 15. tarsus with a claw; 16. antenna; 17. male terminalia. 18. T. (T.) hiemalis, S. Korea, Jeollabuk-do Province, Piagol village, 27.04. 2012, male terminalia (NIBR); 19. T. (T.) major holotype, Great Britain, Shefford Beds, 17.11. 1917, male terminalia (BMNH). Scale bar = 0.2 mm. Abbreviation: p—parameres.