Bracon (Glabrobracon) terebella Wesmael 1838
Creators: name: Papp, Jenő
name: Xviii, Budapest
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Bracon
Bracon terebella

description: Bracon (Glabrobracon) terebella Wesmael, 1838
Figs 48 A-K, 49A-G, 50A-B
Braco terebella Wesmael, 1838: 57 ♀ (type material: 4 ♀♀), type locality: “environs de Bruxelles ” (Belgium), ♀ lectotype (and three ♀ paralectotypes, present designations) in the Royal Belgian Institute of Natural Sciences, Brussels; examined.
Bracon terebella – Szépligeti 1901: 269 (in key, in Hungarian); 1904 (1901): 189, 190 (in key, in German).
Bracon (Glabrobracon) terebella – Fahringer 1927: 294 (♀), 307 (♁) (in key), 1928: 490 (redescription) ♀ ♁, assigned to “Section Glabrobracon ”. — Telenga 1936: 146 (♀), 155 (♁) (in key), 195 (redescription) (in Russian) and 348 (♀), 358 (♁) (in key, in German). — Papp 1966: 377 (in key), 391 (redescription) ♀ ♁. — Shenefelt 1978: 1582 (literature up to 1971). — Tobias 1986: 128 (in key, in Russian). — Tobias & Belokobylskij 2000: 135 (in key, in Russian).
Designation of the ♀ lectotype of Bracon terebella
(First label, printed) “ Coll. Wesmael ”; (second label, printed) “2081”; (third label) “ Braco terebella / var. 1. ♀ ” (handwritten) / “dét. C. Wesmael ” (printed); (fourth label, printed red) “Type”; fifth label is with the (?)inventory number “3.317”; sixth label is with the locality after Wesmael (l.c.) “ Belgium / Bruxelles ” (printed); seventh label is the lectotype card (sixth and seventh labels attached by me). Lectotype is in good condition: (1) micropinned, pin fairly thick; (2) left flagellum deficient, i.e. with 11 flagellomeres; (3) left hind wing missing. - Remark: The lectotype was originally assigned as a variety of the nominate form, this is indiacted on the third (name) label as “var. 1.” This specimen is in the best condition (from among the four syntypes), consequently this was selected for the lectotype status.
Designation of the three ♀ paralectotypes of Bracon terebella
Labels are identical to those of the lectotype except two labels; the second of the two nominate forms with the number “2082”, the third label without “var. 1.” (except one ♀); the paralectotype cards are printed yellow. -- Paralectotypes are in good condition: Legs and wings partly missing or damaged.
Material examined
43 ♀♀ + 18 ♁♁ from nine countries: ENGLAND: 3 ♀♀ + 3 ♁♁ from two localities. GERMANY: 4 ♀♀ + 1 ♁ from five localities. FRANCE: 2 ♀♀ from two localities. DENMARK: 1 ♀. SWEDEN: 3
♀♀ from three localities. BOHEMIA: 1 ♀. SLOVAKIA: 1 ♀. HUNGARY: 24 ♀♀ + 14 ♁♁ from 23 localities. KOREA: 4 ♀♀ from three localities.
Redescription of the ♀ lectotype of Bracon terebella (Figs 48 A-I; 50A)
LENGTH. Body 3.8 mm long.
ANTENNAE. About one-fourth shorter than body and with 28 antennomeres. First flagellomere 1.8 times, further flagellomeres attenuating so that penultimate flagellomere 1.7 times as long as broad (Fig. 48A).
HEAD. In dorsal view transverse (Fig. 48B), 1.8 times as broad as long, eye 1.5 times longer than temple, temple rounded, occiput weakly excavated. Eye in lateral view almost 1.6 times as high as wide, just onefourth wider than temple, temple evenly wide behind eye (Fig. 48C, see arrows). Horizontal diameter of oral opening one-third longer than shortest distance between opening and compound eye (Fig. 48D). Head polished.
MESOSOMA. In lateral view 1.4 times as long as high, polished. Propodeum close around lunule with short rugulae (Fig. 48E).
LEGS. Hind femur 3.1 times as long as broad distally (Fig. 48F). Claw curved, fairly short, its basal lobe large (Fig. 50A).
WINGS. Forewing as long as body. Pterostigma (Fig. 48G) 2.7 times as long as wide and issuing r just proximally from its middle, r almost 0.8 times as long as width of pterostigma. Second submarginal cell of usual size, 3-SR a bit longer than 2-SR, SR1 straight, nearly 1.9 times longer than 3-SR and reaching
tip of wing. First discal cell usual in form, 1-M twice as long as m-cu and not parallel, 1-SR-M almost straight and 1.3 times as long as 1-M (Fig. 48H).
TERGITES. First tergite (Fig. 48I) somewhat longer than broad behind, beyond pair of spiracles parallelsided, together with further tergites polished. Second tergite 2.8 times as broad as long laterally, third tergite one-fifth longer than second tergite laterally, suture between them bisinuate, smooth. Ovipositor sheath short, as long as hind tarsomeres 1-2 combined.
COLOUR. Ground colour of body dark brown to black(ish). Oral part brownish yellow, palpi light brown. Orbit faintly reddish. Tegula black. Tergites dark brown to black, tergites 2-5 laterally yellow. Legs blackish to black, fore femur + tibia, hind femur apically and hind tibia proximally yellow. Wings faintly brownish fumous, pterostigma and veins brown to light btrown.
One ♀ paralectotype “var. 1.” (by Wesmael) is identical with the ♀ lectotype (also assigned as “var. 1.” by Wesmael).
Deviating features of the two ♀ paralectotypes of Bracon terebella (Fig. 48J)
Similar to the ♀ lectotype + one ♀ paralectotype. Body 2.9-3 mm long. Antenna with 26 and 28 antennomeres. Pterostigma 3.3 times as long as wide and issuing r somewhat more proximally from its middle (Fig. 48J). Dark colour of body brown to light brown, legs with more yellow pattern.
Variable features of the ♀ (43 ♀♀) (Figs 48K; 49 A-E; 50B)
Body 2.7-3.5 mm long. Antenna 26-32 antennomeres. Temple rather receded (Fig. 49A) or head rarely 1.7 times as broad as long and temple less rounded (Fig. 48K). Pterostigma wide, 2.5 times as long as wide (Fig. 50B), second submarginal cell long, 3-SR 1.3 times as long as 2-SR (Fig. 49B). Hind femur 2.9 times as long as broad medially (Fig. 49C). First tergite broadening posteriorly, laterally unevenrugulose (Fig. 49D) or scutum apically uneven-rugulose, laterally at most uneven (Fig. 49E). Tergites, beyond first one, with a median dark (dark brown to black) streak, laterally rusty to reddish yellow.
Variable features of the ³ (18 ³³) (Figs 49 F-G; 50B)
Similar to the ♀. Body 2.5-3.5 mm long. Flagellomeres 1.7-2 times longer than broad. Second submarginal cell either long: 3-SR 1.4 times as long as 2-SR (Fig. 49F) or short and fairly broad: 3-SR
about 1.2 times as long as 2-SR (Fig. 50B). First tergite clearly longer than broad behind, tergites 2-3 equal in length (Fig. 49G).
Hosts
COL. Curculionidae: Miarus campanulae Linnaeus, Sibinia femoralis Germar. — HYM. Cephidae: Cephus cinctus Norton, C. pygmaeus Linnaeus, Trachelus tabidus Fabricius.
Distribution
Palaearctic Region, in Europe fairly frequent.
Taxonomic position
Within the subgenus Glabrobracon the species B. terebella is nearest to B. minutator (Fabricius) (Europe) and B. curticaudis Szépligeti (sporadic in Europe and Turkey) viewing their short ovipositor sheath, (almost) polished tergites and dark corporal colour; they are separated by the features keyed:
1 (2) First tergite as long as broad behind, second tergite polished (Fig. 50C) or at least (and exceptionally) antero-medially uneven-subrugulose (Fig. 50D). Claw slightly less downcurved (Fig. 50E). Tergites reddish yellow to rusty, medially with a dak brown to black(ish) maculae or with a median streak. ♀: 4-5 mm, ♁: (3.2-) 3.5-4 mm ............... B. (Gl.) minutator (Fabricius, 1798)
2 (1) First tergite not as long as broad behind, second tergite either rugulose or polished (Figs 48I; 49 D-E, G). Claw slightly more downcurved (Fig. 50A, G). Colour of tergites other.
3 (4) First tergite somewhat broader behind than long, beyond pair of spiracles with slightly broadening sides; suture between tergites 2-3 distinct, bisinuate, deep, second tergite antero- medially rugulose (Fig. 50F). Basal lobe of claw more distinct (Fig. 50G). Metasoma reddish yellow, first tergite entirely and tergites 5-6 almost entirely black. ♀: 3-4.5 mm, ♁: 3.4 mm ........................................................................................................ B. (Gl.) curticaudis Szépligeti, 1901
4 (3) First tergite longer than broad behind, beyond pair of spiracles parallel-sided, or rarely with broadening sides, suture between tergites 2-3 less distinct, weakly bisinuate to almost straight, less deep; second tergite polished (Figs 48I; 49 D-E, G). Basal lobe of claw less distinct (Fig. 50A). Tergites widely dark brown to black. ♀ ♁: (2-) 3-3.5 mm ..................................................... ............................................................................................................ B. (Gl.) terebella Wesmael, 1838
description: Published as part of Papp, Jenő & Xviii, Budapest, 2012, A revision of the Bracon Fabricius species in Wesmael's collection deposited in Brussels (Hymenoptera: Braconidae: Braconinae), pp. 1-154 in European Journal of Taxonomy 21 on pages 100-104, DOI: 10.5852/ejt.2012.21, http://zenodo.org/record/3858161