Dziedzickia bifida, Ševčík & Bechev & Hippa, 2011

Ševčík, Jan, Bechev, Dimitar & Hippa, Heikki, 2011, New Oriental species of Gnoristinae with pectinate antennae (Diptera: Mycetophilidae), Acta Entomologica Musei Nationalis Pragae 51 (2), pp. 687-696 : 688-691

Dziedzickia bifida sp. nov.

( Figs. 1–2 , 5 , 10–11 )

Type material. HOLOTYPE: J, THAILAND: NAKHON SI THAMMARAT: Namtok Yong NP, TV aerial, 8°14.262′N 99°48.289′E, 966 m, Malaise trap, 11.–18.viii.2008, Paiboon leg., T3109 ( QSBG) . PARATYPES: THAILAND: the same data as holotype, 3 JJ 1 ♀ ( JSOC, QSBG). CHANTHABURI: Khao Khitchakut NP, 300 m from forest base to Khao Prabaht peak, 12°50.4′N 102°9.85′E, 927 m, Malaise trap, 27.iii.–3.iv.2009, Suthida & Charoenchai leg., T4067, 1 J ( JSOC). CHIANG MAI: Chiang Dao Wildlife Research Station , 12–13.v.2004, Sivec & Horvat leg., 1 J ( DBPC) ; Chiang Dao, 10.–14.vi.2003, I. Sivec leg., 1 J (in DBPC). NAKHON NAYOK: Khao Yai NP, Lum Ta Kong View Point , 14°25.82′N 101°23.754′E, 744 m, Malaise trap, 19.–26.iv.2007, Wirat Sukho leg., T2129, 1 J 1♀ ( JSOC) ; Khao Yai NP, Lum Ta Kong View Point, 14°25.82′N 101°23.754′E, 744 m, Malaise trap, 26.iv.–2.v.2007, Pong Sandao leg., T2132, 2 JJ, 1 ♀ ( QSBG, JSOC). SAKON NAKHON: Phu Phan NP, dry evergreen near house no. 1567, 16°48.628′N 103°53.591′E, 522 m, Malaise trap, 16.–22.vi.2007, Winlon Kongnara leg., T2499, 1 J ( QSBG) . MALAYSIA: PERAK: Hulu, Perak Belum Expedition, B. Camp, 5º30′07′′N 101º26′21′′E, 250 m, 21.iii.–14.iv.1994, I. Sivec leg., light trap, 1 J ( DBPC). SELANGOR: Ulu Gombak, University of Malaya Field Study Centre , 800 ft, Malaise trap, 22.ii.–21.iii.1997, H. Hippa, M. Jaschhof and B.Viklund leg., 1J ( NHRM) . INDONESIA: SUMATRA: Aceh, Gunung Leuser Nat. Park, Ketambe Res. Sta. , 1.–28.ii.1990, DC Darling, IIS 900011, 1° rainforest, young forest, Terrace 3, closed canopy, 350 m, 3°41′N 97°39′E, Malaise trap head, 2 JJ ( MBBJ, JSOC) .

Additional material examined. The following material (mostly specimens without antennae and/or legs) is not included in the type series: MALAYSIA: SELANGOR: Ulu Gombak, University of Malaya Field Study Centre, 800 ft, Malaise trap, 22.ii.–21.iii.1997, H. Hippa, M. Jaschhof and B. Viklund leg., 10 JJ ( NHRM, JSOC). INDIA: MEGHALAYA: Balpakram, 1996, 1 J ( JSOC).

Description. Male. Body length 4.2 mm. Wing length 3.65 mm (holotype).

Head yellowish, parietal area dark brown. Three ocelli, almost in one line. Lateral ocellus little broader than the median, separated from eye margin for distance about 1.2 times, and from median ocellus by about 0.5 times their diameter. Antennae bipectinate. Scape and pedicel yellowish. Scape prolonged forwards. Flagellomeres 1 to 3 yellowish, rest mostly brown. Flagellar projections brownish. Flagellomeres 2 to 13 with a pair of long anterolaterally directed projections ( Fig. 1 ), flagellomere 14 single, elongated, bifid only at its apex (not bifid in the Indian specimen). Projections covered by thin setae, little longer than the diameter of the projection. Clypeus ovate. Mouthparts yellowish, short, palpus brownish yellow, with four palpomeres, the first one is the shortest, the apical one the longest.

Thorax. Scutum yellow with brown lateral stripes of variable size in posterior two thirds (all dark brown in the Indian specimen). Scutellum and pleura yellow. Scutum with acrostichal and dorsocentral setae, and somewhat longer laterals; areas in-between bare. Scutellum with an anterior transverse row of short setae and with a group of longer setae (as long as scutellum) laterally.Anterior parapsidal suture distinct. Proepisternum with some small setae. All pleura and mediotergite bare.

Wing ( Fig. 5 ) hyaline, unmarked, membrane covered only with microtrichia, without macrotrichia. Costa produced beyond R 5 to 2/3 of the distance between the tips of R 5 and M 1. Sc long, bare, ending in R 1 before Rs. Apical part of Sc may be indistinct or interupted. R-M about 4 times as long as Rs, and twice as long as stem of M-fork. Base of Cu-fork before the base of M-fork. CuP weak, shorter than A 1. Very small setulae present on upper side of R, R 1 and R 5. Other veins bare. Halteres yellow, with knobs slightly darker.

Legs. Coxae, femora and fore tibiae yellow, mid and hind tibiae brownish, all tarsi brown. Tibial trichia irregularly arranged. Some longer apical setae on tibia 1 to 3. Tibial spurs formula 1: 2: 2. Anteroapical depressed area of fore tibia poorly developed. Mid tibia apically swollen. Ratio fore tibia: tarsomeres 1 to 5 = 5: 3.5: 2: 1.5: 1: 1.

Abdomen yellow with dark bristles. Tergites 1 to 7 with brown posterior bands and 4 to 7 also with brownish marks in anterior part. Sternites without median sclerotized concave fold.

Terminalia. Tergite 9 short, transverse, about twice as broad as long ( Fig. 11 ). Cerci about as long as tergite 9, placed caudally to tergite 9. Gonocoxites touching ventrally but not fused, with a deep ventral excavation reaching to about middle of the gonocoxites ( Fig. 10 ). Gonocoxite apically narrowing, forming a small posterior projection. Aedeagal complex apically rounded. Gonostylus with proximal lobe subtriangular, apically pointed. Distal lobe of gonostylus prolonged medially, apically rounded (with a small hook apicodorsally), with a distinct narrow ventral subapical projection ( Figs. 10–11 ).

Female. Body length 5.7 mm. Wing length 5.35 mm. Similar to male in most respects. Head all dark brown, including palpi ( Fig. 2 ). Flagellomeres simple, only slightly prolonged anteriorly, dark brown ( Fig. 2 ). Scutum all dark brown. Scutellum, all pleura and mediotergite yellow. Abdominal tegrite 1 dark, tergites 2 to 7 with dark posterior halves and darkened laterally. Tergite 8 and terminalia dark brown.

Differential diagnosis. This species differs from all species described up to now in Dziedzickia in having bipectinate antennae. The antennae of D. pectinata sp. nov. (described below) are also pectinate but with only a single projection on each flagellomere.

Etymology. From the Latin adjective bifidus (= split), referring to the shape of male flagellomeres.

Distribution. India (Meghalaya), Thailand (Chanthaburi, Chiang Mai, Nakhon Nayok, Nakhon Si Thammarat, Sakon Nakhon), Malaysia (Perak, Selangor), Indonesia (Sumatra).

Comments. The peculiar male antennae with two projections on each flagellomere is a distinct feature of this species, hitherto known within the family Mycetophilidae only in the Afrotropical species Metanepsia pectinatissima Matile, 1980 (see MATILE 1980). Single projections on the male flagellomeres are typical for three mycetophilid genera of the subfamily Metanepsiinae – Chalastonepsia Søli, 1996 , Metanepsia Edwards, 1927 and Pectinepsia Ševčík & Hippa, 2010 (see KALLWEIT 1998, ŠEVČÍK & HIPPA 2010). Interestingly, MATILE (1981) mentioned an undescribed Oriental genus of Gnoristini with pectinate antennae but it is unclear which taxon he meant.

Such bifid projections on flagellomeres are known within Diptera also in some genera of Tipulidae (e.g. Ctenophora Meigen, 1803 , Dictenidia Brullé, 1833 ) and Limoniidae ( Rhipidia Meigen, 1818 ).

Figures

Figs. 1–4.1–2 – Dziedzickia bifida sp. nov., head and thorax in lateral view (1 – male, holotype; 2 – female,paratype). 3–4 – D. pectinata sp. nov., head and thorax in lateral view (3 – male, holotype; 4 – female, paratype).

Figs. 5–9. 5–7 – wing venation (5 – Dziedzickia bifida sp. nov., holotype; 6 – D. pectinata sp. nov., holotype; 7 – Schnusea sp., male from Peru). 8–9 – Dziedzickia pectinata sp. nov., paratypes (8 – male fore tibia; 9 – female fore tarsus).

Figs.10–13. 10–11 – Dziedzickia bifida sp. nov., holotype, male terminalia (10 – ventral view; 11 – dorsal view). 12– 13 – D. pectinata sp. nov., holotype, male terminalia (12 – ventral view; 13 – dorsal view). Scale bars: 0.1 mm.