Research Article |
Corresponding author: Buntika A. Butcher ( buntika.a@chula.ac.th ) Academic editor: Kees van Achterberg
© 2016 Buntika A. Butcher, Donald D. L. Quicke, Santhosh Shreevihar, Avunjikkattu Parambil Ranjith.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Butcher BA, Quicke DLJ, Shreevihar S, Ranjith AP (2016) Major range extensions for two genera of the parasitoid subtribe Facitorina, with a new generic synonymy (Braconidae, Rogadinae, Yeliconini). ZooKeys 584: 109-120. https://doi.org/10.3897/zookeys.584.7815
|
The genera Conobregma van Achterberg and Facitorus van Achterberg are recorded from the Afrotropical region and the Indian subcontinent, respectively, for the first time, and two new species are described and illustrated: Conobregma bradpitti Quicke & Butcher, sp. n. from South Africa and Facitorus nasseri Ranjith & Quicke, sp. n. from India. Conobregma bradpitti sp. n. is intermediate between Conobregma which was described originally from the New World, and Asiabregma Belokobylskij, Zaldivar-Riverón & Maetô, which was coined for the S. E. Asian and East Palaearctic (Japanese) species described under the name Conobregma, plus more recently discovered taxa, but the differences between these genera are few and slight. Of the four previously proposed diagnostic characters for separating Asiabregma from Conobregma, the new species shares two with each, and therefore, the two genera are formally synonymised. Facitorus was previously known only from the East Palaearctic region and from S. E. Asia (Japan, Nepal, Taiwan and Vietnam).
New distribution record, new species, new synonymy, parasitoid
The Facitorini were originally described as a tribe in the subfamily Betylobraconinae Tobias, 1979 based on the genera Facitorus van Achterberg from Nepal, China and Taiwan, Conobregma van Achterberg from the USA and Dominican Republic, and Jannya van Achterberg from Colombia and Costa Rica (
Shortly after the original description of Conobregma, which was based on New World species,
Differences used by
Characters | Conobregma | C. bradpitti sp. n. | ‘Asiabregma’ |
---|---|---|---|
Claw of middle leg | short, not pectinate | long and pectinate | long and pectinate |
Postpectal carina | absent | absent | distinct |
Fore wing vein 2CUa | short <= m-cu | short = m-cu | long > twice m-cu |
Carina between eye and antennal sockets | absent | present | present |
The holotype of C. bradpitti sp. n. is deposited in the Hymenoptera Institute Collection, Department of Entomology, University of Kentucky, Lexington, Kentucky. It was imaged using an Olympus SXZ16 microscope with automated multiple image capture at preset focal levels using an Olympus DP72 camera, and image combination using the Cell^D image processing system. The specimen was card-mounted and rather fragile but we successfully remounted it to enable more features to be seen.
The holotype of F. nasseri sp. n. is deposited in the Department of Zoology, University of Calicut, Kerala, India. It was imaged using an Leica M205A stereomicroscope with automated multiple image capture at preset focal levels using an Leica DMC 2900 camera, and image combination using the Leica Application Suite image processing system v4.7. All images were edited using Photoshop CS6 (Version 6.1) (Adobe Inc.).
Terminology follows
Holotype female: “South Africa, Madlangula, Kosi Bay, 14.iii – 30.iv.1985, R. Kyle”.
Conobregma bradpitti sp. n. may be distinguished from the East Palaearctic and East Asian species (C. makiharae (Belokobylskij, Zaldivar & Maetô, 2008), C. ryukyuensis (Belokobylskij, Zaldivar & Maetô, 2008)) and C. sulaensis van Achterberg, 1995) by fore wing vein 2CUa being approximately the same length as m-cu rather than approximately twice as long. It may be distinguished from all the New World species except for C. cometes van Achterberg, 1995 by having the third metasomal tergite almost entirely smooth. It differs from C. cometes in having the mesoscutum coarsely sculptured with deep depressions at the bases of setae rather than being coriaceous, and by having the propodeum distinctly less strongly sculptured antero-laterally.
Length of body 1.75 mm, and of fore wing 1.5 mm.
Head. Antennae broken. First flagellomere 1.05 × longer than 2nd and 3rd respectively; approximately 1.8 × longer than apically wide, expanding from base to apex. Width of head: width of face: height of eye = 1.0: 0.5: 0.42. Eyes glabrous, with distinct curving fine ridge between antennal socket and eye. Distance between posterior ocelli: transverse diameter of posterior ocellus: shortest distance between posterior ocellus and eye = 1.0: 1.0: 2.5. Frons and occiput smooth. Occipital carina complete.
Mesosoma. Mesosoma 1.8 × longer than high. Propleuron largely smooth. Mesoscutum irregularly sculptured, with deep pits at bases of setae, these forming very conspicuous submarginal rows; with rugulose sculpture between notauli posteriorly. Notauli deeply impressed and strongly sculptured. Precoxal sulcus running from anterior margin to just posterior of mid-length of metapleuron, rugulose. Mesopleuron and mesosternum otherwise largely smooth. Median area of metanotum with weak mid-longitudinal ridge. Propodeum largely foveate except for pair of triangular areas anteriorly on either side of mid-line which are finely aciculate; with short mid-longitudinal carina anteriorly.
Wings. Pterostigma 2.1 × longer than its maximum width. Fore wing vein r-rs approximately 0.65 × maximum width of pterostigma. Lengths of fore wing veins r-rs: 3RSa: 3RSb = 1.0: 3.0: 5.5. Lengths of fore wing veins CU1a: CU1b = 1.0:1.25.
Legs. Fore femur: tibia: tarsus = 1.3: 1.25: 1.0. Fore basitarsus 1.5 × longer than next three articles combined. Mid-tibial claw with well-developed, pecten. Hind femur: tibia: tarsus = 1.0: 1.2: 1.2.
Metasoma. Second metasomal tergite with fine longitudinal striation and interconnecting transverse ridges; approximately 1.8 × longer than third metasomal tergite medially. Second suture finely crenulate. Third tergite almost entirely smooth but with traces of longitudinal striation near lateral parts of second suture. Thrid-fifth metasomal tergites distinctly arched in lateral profile. Ovipositor sheath 0.4 × length of hind tibia.
Colour. Stemmaticum and mesosoma entirely dark brown, nearly black; head, antennae (part remaining) and legs pale brown-yellow; metasomal tergites brown. Wings hyaline with pale grey-brown venation.
Named after the senior author’s favourite film actor Brad Pitt, whose poster adorned the wall of her laboratory during her doctoral studies.
Unknown.
South Africa.
Unknown.
Holotype, female, “India, Kerala, Malappuram, Calicut University Botanical Garden, 14–21.xii.2015, Malaise Trap, ex. Ranjith, A.P.”
Facitorus nasseri sp. n. is distinguished from F. brevicornis van Achterberg and F. superus van Achterberg in having occipital carina complete, mesoscutum covered by long setae and scutellum with sub-posterior depression. Facitorus nasseri sp. n. comes close to F. tamdaoensis Belokobylskij & Long, by its smooth metasomal tergite 2, but it differs from F. tamdaoensis by the following characters; mesoscutum sculptured antero-laterally (smooth in F. tamdaoensis), frons without shallow pit medially (frons with shallow pit medially in F. tamdaoensis), propodeum with ‘H’ shaped carina posteriorly (smooth in F. tamdaoensis), pterostigma 2.9 × longer than maximum wide (3.6 × in F. tamdaoensis) and second tergite entirely smooth (densely striate basally in F. tamdaoensis). It differs from F. granulosus and F. amamioshimus by first flagellomere 2.1 × as long as apically wide (3.5–4.2 × in F. granulosus and 3.5–4.0 × in F. amamioshimus), second metasomal suture not crenulate (crenulate in F. granulosus and F. amamioshimus), third metasomal tergite entirely smooth (distinctly sculptured at least baso-laterally in F. granulosus and F. amamioshimus). A key for the identification of Facitorus species is presented below.
Holotype, female (♀), length of body 1.7 mm and fore wing 1.35 mm.
Head. Antennae with 18 segments. First flagellomere 1.2 × as long as second and third respectively, 2.1 × longer than apically wide, distinctly expanded from base to apex. Terminal flagellomere acute, 3.1 × as long as its maximum width. Width of head: width of face: height of eye = 13.4: 6.8: 7.1. Frons and occiput smooth with long setae. Eyes glabrous, with a straight groove between antennal socket and eye margin. Distance between posterior ocelli: transverse diameter of posterior ocellus: shortest distance between posterior ocellus and eye = 13.5: 10.25: 18.8. Occipital carina complete.
Mesosoma. Mesosoma 1.72 × longer than high. Propleuron smooth. Mesoscutum sculptured antero-laterally, smooth medio-posteriorly with long setae. Notauli impressed, meeting posteriorly and finely crenulate. Scutellar sulcus wide, deep and divided by a single carina. Scutellum smooth, sparsely setose with subposterior transverse depression. Median area of metanotum with medio-longitudinal ridge, rest smooth. Precoxal sulcus distinct only anteriorly impressed. Metapleuron medially smooth, rest rugose. Propodeum without medio-longitudinal carina, basal half distinctly foveate and with ‘H’ shaped carinae and transverse carinae. Pterostigma 2.9 × longer than maximally wide. Fore wing vein r-rs approximately 0.8 × maximum width of pterostigma. Lengths of fore wing veins r-rs: 3RSa: 3RSb = 2.8: 4.4: 12.5. Lengths of fore wing veins CU1a: CU1b = 3.25: 4.37. Fore femur: tibia: tarsus = 4.7: 4.58: 3.34. Fore basitarsus 1.6 × longer than next three articles combined. Mid-tibial claw well-developed, pectinate. Hind femur: tibia: tarsus = 5.4: 7.7: 7.0.
Metasoma. Metasomal tergite 1 distinctly striate, smooth medio-posteriorly, striae reaching posterior margin laterally, slightly convex apically, sparsely setose. Tergite 2 smooth, sparsely setose medially, setose laterally, 1.6 × as long as third tergite. Second metasomal suture slightly impressed, not crenulate. Tergite 3 smooth with a pair of setae medio-basally and postero-laterally. Rest of the tergite smooth, exposed in lateral view and sparsely setose. Ovipositor sheath setose and 0.42 × as long as hind tibia.
Colour. Body dark brown except scape, pedicel, first flagellomere, basal half of second flagellomere, maxillary palp, tegulae, legs and ovipositor yellow; face yellowish brown anteriorly below antennal sockets; propleuron ventrally yellowish brown; wings hyaline; pterostigma and venation light brown.
APR dedicates this species to Dr. M. Nasser for his encouragement and sharing his knowledge about the behaviour of parasitoids, and also for the fruitful discussions during the field trips.
Unknown.
India (Kerala).
Unknown.
1 | Scutellum without sub-posterior depression; occipital carina interrupted medially; mesoscutum without long setae | 2 |
– | Scutellum with subposterior depression; occipital carina complete; mesoscutum often covered by long setae | 3 |
2 | Fore wing vein r 1.5 × as long as 2-SR; malar space 2.8 × basal width of mandible; face sparsely punctate; second tergite largely smooth | F. brevicornis van Achterberg |
– | Fore wing vein r almost equal to or shorter than 2-SR; malar space 2 × basal width of mandible; face smooth; second tergite rugose-punctate | F. superus van Achterberg |
3 | Mesoscutum entirely smooth or rugose antero-laterally; third tergite entirely smooth | 4 |
– | Mesoscutum granulate; third tergite distinctly sculptured, at least baso-laterally | 5 |
4 | Mesoscutum rugose antero-laterally; transverse diameter of eye twice as long as temple; frons without shallow pit near antennal sockets; anterior half of propodeum foveate, with ‘H’ shaped carina posteriorly and transverse carina; pterostigma 2.9 × as long as its maximum width; hind coxa entirely smooth | F. nasseri Ranjith & Quicke, sp. n. |
– | Mesoscutum entirely smooth; transverse diameter of eye 2.7 × as long as temple; frons with shallow pit near antennal sockets; propodeum densely rugose-reticulate; pterostigma 3.6 × as long as its maximum width; hind coxa rugose-striate laterally | F. tamdaoensis Belokobylskij & Long |
5 | Hind coxa dorsally striate; second metasomal suture deep; pterostigma enlarged, 1.1–1.2 × as long as R1; third tergite distinctly and widely sculptured; mesoscutum distinctly granulate | F. granulosus Belokobylskij & Long |
– | Hind coxa entirely smooth; second metasomal suture shallow; pterostigma not enlarged, 0. 9× as long as R1; third tergite only baso-laterally finely striate or rugulose-strate; mesoscutum finely granulate | F. amamioshimus Belokobylskij, Zaldivar-Riverón & Maetô |
Conobregma bradpitti sp. n. is the first record of the Facitorina from the African continent, the others occurring in the East Palaearctic, East Asia and North America (including Caribbean). The new species keys out easily to Conobregma in the generic key to Betylobraconi (as –inae) by
Facitorus nasseri sp. n. is the first facitorine recorded from Indian subcontinent. The yeliconine subtribe Facitorina consists of the genera Facitorus, Conobregma and Jannya and they share the following characters; antennal sockets closer to each other than to eyes, frons without groove, antenna situated on a shelf, fore wing vein M+CU strongly curved apically (
BAB and DLJQ are very grateful to Mike Sharkey (Kentucky) for making available for study many interesting braconid specimens. BAB and DLJQ would like to thank Chulalongkorn University Centenary Academic Development Project for support, and the Animal Systematic Research Unit and the Integrative Ecology Lab, Department of Biology, Faculty of Science, Chulalongkorn University for allowing us to use their Cell^D imaging facility. SS and APR financially supported by Department of Science and Technology, Government of India under SERB-Young Scientist Scheme (SB/YS/LS-42/2014).