Description of a new species of Eubroncus Yoshimoto (Hymenoptera: Mymaridae) from India, with a key to world species

 

 

Selvaraj Palanivel 1 & Sagadai Manickavasagam 2

 

 

1,2 Parasitoid Taxonomy and Biocontrol Laboratory, Department of Entomology, Faculty of Agriculture,

Annamalai University, Chidambaram, Tamil Nadu 608002, India

1 agripalani10@gmail.com, 2 drmanicks2003@yahoo.co.in (corresponding author)

 

 

 

doi: http://dx.doi.org/10.11609/JoTT.o4176.7152-6 | ZooBank: urn:lsid:zoobank.org:pub:CE248AC7-4208-4C04-9288-3B276C9CFF48

 

Editor: Hui Xiao, Chinese Academy of Sciences, Beijing, China. Date of publication: 26 April 2015 (online & print)

 

Manuscript details: Ms # o4176 | Received 20 October 2014 | Final received 27 March 2015 | Finally accepted 03 April 2015

 

Citation: Palanivel. S. & S. Manickavasagam (2015). Description of a new species of Eubroncus Yoshimoto (Hymenoptera: Mymaridae) from India, with a key to world species. Journal of Threatened Taxa 7(5): 71527156; http://dx.doi.org/10.11609/JoTT.o4176.7152-6

 

Copyright: © Palanivel & Manickavasagam 2015. Creative Commons Attribution 4.0 International License. JoTT allows unrestricted use of this article in any medium, reproduction and distribution by providing adequate credit to the authors and the source of publication.

 

Funding: Annamalai University.

 

Competing Interest: The authors declare no competing interests.

 

Acknowledgements: We are grateful to Dr. John Huber of Ottawa, Canada for his continuous support and Xiang-Xiang Jin, School of Forest, Northeast Forestry University, Harbin, China, for her help in confirming the species identity.

 

 

 

Abstract: A new species of the genus Eubroncus Yoshimoto, Kozlov & Trjapitzin is described from India and a key to world species is provided.

 

Keywords: Eubroncus scutatus sp. nov., Hymenoptera, India, Karnataka, Mymaridae, new species, Tamil Nadu.

 

Abbreviations: YPT - Yellow pan trap; F - 1-6 Funicle segments; Gt1 - Gastral tergite 1: Gs1 - Gastral sternite 1; OD - Mid ocelli diameter; POD - Post ocelli diameter; OOL - Ocular-ocelli distance; OCL - Least post ocellus-occipital margin length; POL - Postocelli distance; MOL - Least mid ocellus-occipital margin length.

 

 

 

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Genus Eubroncus was erected by Yoshimoto et al. (1972) under the subfamily Eubroncinae, that includes two genera, Eubroncus Yoshimoto, Kozlov & Trjapitzin and Stomarotrum Yoshimoto, Kozlov & Trjapitzin, based on prominent mandibles that were almost as long as the head height. Eubroncus was erected with E. orientalis Yoshimoto, Kozlov & Trjapitzin (male) as the type species from Malaysia, and Stomarotrum with S. prodigiosum Yoshimoto, Kozlov & Trjapitzin (female) from the Russian Far East. Later Triapitsyn & Huber (2000) synonymized Stomarotrum with Eubroncus. Triapitsyn & Berezovskiy (2002) redescribed E. prodigiosus (Yoshimoto, Kozlov & Trjapitzin) and keyed males of the two known species based on color of mesosoma and whether the pronotum is divided or not. Viggiani (2003) described the male genitalia of E. prodigiosus from Japan. Lin et al. (2007) recorded an unidentified species from Australia. Hayat & Khan (2009) described the third species, E. indicus Hayat & Khan, from a single female from India. Jin & Li (2014) described three additional species, E. vertexus Jin & Li, E. bani Jin & Li and E. tibetanus Jin & Li, from China. Here we describe the second species from India and seventh from the world.

 

 

Materials and Methods

 

Collections were made using yellow pan traps as described by Noyes (1982) from sandalwood forest area of Institute of Wood Science and Technology (IWST), Bengaluru, Karnataka and Oilpalm ecosystem, Mulakadu, Kallakuruchi Taluk of Tamil Nadu. Specimens were processed using hexamethyldisilazane as described by Brown (1993) and either card, point or slide mounted, labeled and studied. All specimens are deposited with Entomology Department, Annamalai University (EDAU), Chidambaram, Tamil Nadu, India and National Bureau of Agricultural Insect Resources (NBAIR) (formerly NBAII), Bengaluru, Karnataka, India. All measurements (except habitus images) are actual divisions under 40x (One division = 0.0025mm). Montage images were captured using Leica DM 750 phase contrast microscope for slide mounted parts and the habitus images using Leica M205C stereo zoom microscope.

 

Results

 

 

Eubroncus scutatus

Manickavasagam & Palanivel sp. nov. (Images 1–11)

urn:lsid:zoobank.org:act:AFAB22F0-811D-480A-B204-D64519B835F2

 

 

Materials examined

Holotype: EDAU/Mym10/2014, 25.x.2013, female (EDAU) on slide, labeled “Eubroncus scutatus Manickavasagam & Palanivel”, sandalwood forest, yellow pan traps, IWST campus, Bengaluru, Karnataka, India. Coll. Manickavasagam & Palanivel.

Paratypes: EDAU/Mym10/2014, 4.viii.2014, one male on slide under five coverslips with same data as in Holotype. Two females and two males [1 female & 1 male on slide under five coverslips with NBAIR, Bengaluru (ICAR/NBAIR/P225)], [1 female & 1 male on card with EDAU], yellow pan traps, oil palm ecosystem, Mulakadu, Kallakuruchi Taluk, coll. Gowthaman & Abhinav Kumar.

 

 

 

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Female (Image 1)

(Holotype) Body length 0.81mm. Head black with ocelli and brown mandibles and eyes dirty pink. Antenna dark brown with radicle yellowish-brown; mesosoma dark brown; wings more or less uniformly infuscate, with paler spots below base of marginal vein; all legs uniformly brown with ovipositor light brown.

Head (Image 3) 1.4x as long as wide; eyes sub triangular, 2.3x as long as wide, finely setose. Vertex smooth, 1.6x as long as wide. Mid ocellus more or less round, postocelli oval. MOL 1.7x as long as OD; OCL equal to POD; POL 0.28x as long as OOL. Mandible (Image 4) 0.69x as long as head and 1.6x as long as vertex in dorsal view. Antenna (1161) (Image 5) with radicle 0.30x as long as scape; scape 4.3x as long as wide; pedicel 1.7x as long as wide, and 2.8x as long as F1; F1 without sensilla, F2–F6 each with two longitudinal sensillae; clava shorter than scape, 2.4x as long as wide, with six visible longitudinal sensillae.

Mesosoma (Image 9) 1.9x as long as wide. Pronotum 0.59x as long as wide, with a faint longitudinal carina medially, each lobe with about 25 setae dorsally, with reticulate sculpture ventrally. Mesoscutum 0.91x as long as pronotum, strongly reticulate (Image 10), with a pair of strong setae at posterolateral angle, lateral lobes also sculptured and again with a seta in each lobe posterolaterally. Axilla with longitudinal carinae laterally fading towards anterior scutellum, with one strong seta in each axilla, posterior end with reticulate sculpture. Scutellum 1.19x as long as mesoscutum, anterior scutellum with two placoid sensillae at middle, post scutellum with 2–3 longitudinal carinae on lateral sides and strongly foveate on the entire anterior margin; whole mesosoma ventrally reticulately sculptured. Metanotum band like medially and narrowing laterally and reticulately sculptured anterodorsally. Propodeum 0.82x as long as mesoscutum, and 0.67x as long as scutellum, with strong reticulate sculpture medially and laterally and with a pair of setae. Mesophragma broadly ‘v’ shaped almost reaching posterior margin of propodeum.

Fore wing (Image 7) 4.0x as long as wide, longest marginal cilia about 0.33x as long as maximum wing width; submarginal vein with eight, marginal vein with six setae along anterior margin. Hind wing (Image 8) 9.0x as long as wide, longest marginal cilia about 0.77x as long as maximum wing width. Legs: fore coxae 2.8x as long as wide; fore, mid and hind coxae respectively very faintly, faintly and strongly reticulately sculptured.

Metasoma (Image 11) petiole as long as wide with short spine like projections anterolaterally, and with reticulate sculpture dorsally. Gt1 and Gs1 smooth; ovipositor slightly exerted, as long as mesotibia.

Measurements (length/width): Head: 101:69, Antenna: radicle: 16:5, scape 52:12, Pedicel 17:10, F1 6:11, F2 8:12, F3 8:13, F4 8:13, F5 7:13, F6 7:15, Clava 51:21, Forewing: 290:71, longest marginal cilia 24. Hind wing: 280:31, marginal cilia 24. Mesosoma: 155:79; pronotum: 37:62; Metasoma 149:110, ovipositor: 57:30. Legs (given as coaxe, femur, tibia, tarsus 1-4): Fore 52:56:44:20:10:8:11, Middle: 22:51:56:15:11:8:12, Hind: 32:52:74:15:14:12:14.

Relative measurements: OD 7, OCL 4, OOL 14, POL 4, POD 4, MOL 12.

 

 

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Male (Image 2)

Body length 0.78mm. Simlar to female except for normal sexually dimorphic characters and following: Antenna with all flagellar segments longer than wide, each with two sensillae.

Measurements (Length/width, 0.78mm): Head 90:67, radicle 16:5, scape 56:11, Pedicel 16:10, F1 18:10, F2 19:9, F3 19:10, F4 20:10, F5 20:10, F6 19:9, F7 20:10, F8 19:10, F9 20:11, F10 20:10, F11 24:7, Fore wing 296:88, marginal cilia 36. Hind wing 284:31, marginal cilia 25. Genitalia: 32:5.

 

 

Host

Unknown.

 

 

Distribution

India: Karnataka and Tamil Nadu.

 

 

Etymology

This species is named after the species specific character of mesoscutum with reticulate sculpture.

 

 

Comments

Eubroncus scutatus can be separated from the closest species E. vertexus by its smooth vertex and sculptured mesoscutum (in vertexus vertex covered with scale-like sculpture and mesoscutum smooth), postscutellum with strong fovea along entire anterior margin (in vertexus fovea present only medially). Among other known species of Eubroncus, E. prodigiosus has scutum with faintly reticulate sculpture, but antennal measurements and wings are different [(in scutatus, scape is 4.3x as long as wide, in prodigiosus it is only 3x); fore wings 4x as long as wide in scutatus, 3.7x in prodigiosus; hind wings 9x long as wide in scutatus where as it is 7.8 to 8.2x in prodigiosus)].

 

 

References

 

 

Brown, B.V. (1993). A further chemical alternative to critical point drying for preparing small (or large) flies. Fly Times 7: 10.

Hayat, M. & F.R. Khan (2009). First record of Eubroncus from India (Hymenoptera: Chalcidoidea: Mymaridae), with description of a new species. Journal of Threatened Taxa 1(8): 439–440.

Jin, X.X. & C.D. Li (2014). First record of Eubroncus (Hymenoptera, Mymaridae) from China, with description of three news species. Zookey 399: 29–41; http://dx.doi.org/ doi: 10.3897/zookeys.399.6996

Lin, N.Q., J.T. Huber & J. La Salle (2007). The Australian genera of Mymaridae (Hymenoptera: Chalcidoidea). Zootaxa 1596: 1–111.

Noyes, J.S. (1982). Collecting and preserving chalcid wasps (Hymenoptera: Chalcidoidea). Journal of Natural History 16: 315–334.

Triapitsyn, S.V. & V.V. Berezovskiy (2002). Review of the Mymaridae (Hymenoptera, Chalcidoidea) of Primorskii Krai: genera Anagroidea Girault and Eubroncus Yoshimoto, Kozlov et Trjapitzin. Far Eastern Entomologist 114: 1–17.

Triapitsyn, S.V. & J.T. Huber (2000). Fam. Mymaridae-mymarids, pp. 603–614. In: Ler, P.A. (ed.). Key to the insects of Russian Far East 4(4), Dal’ nauka, Vladivostok.

Viggiani, G. (2003). A further contribution to the knowledge of the male genitalia in the Mymaridae (Hymenoptera: Chalcidoidea). Bollettino del Laboratorio di Entomologia Agraria Filippo Silvestri, Portici 59: 59–74.

Yoshimoto, C.M., M.A. Kozlov & V.A. Trjapitzin (1972). A new subfamily of Mymaridae (Hymenoptera, Chalcidoidea, Mymaridae). Entomologicheskoe Obozrenie 51(4): 878–885 (In Russian) (English translation: Entomological Review 51: 521–525).

 

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