Research Article |
Corresponding author: Fabiana E. Gallardo ( gallardo@fcnym.unlp.edu.ar ) Academic editor: Matthew Yoder
© 2017 Fabiana E. Gallardo, Vanina Anadina Reche, Isabel Bertolaccini, Brenda Zarate, Cecilia Curis.
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:
Gallardo FE, Reche VA, Bertolaccini I, Zárate B, Curis C (2017) A new genus and species of Eucoilinae (Hymenoptera, Cynipoidea, Figitidae) parasitoid of Euxesta eluta Loew (Diptera, Otitidae) attacked Bt sweet corn in Argentina. Journal of Hymenoptera Research 54: 57-70. https://doi.org/10.3897/jhr.54.10096
|
Euxestophaga Gallardo, a new genus of Eucoilinae (Hymenoptera, Cynipoidea, Figitidae) and Euxestophaga argentinensis Gallardo, sp. n. from Argentina, are described and illustrated. This new genus belongs to the Ganaspini and morphologically resembles Epicoela Borgmeier and Striatovertex Schick, Forshage and Nordlander. A key to differentiate these genera is given. Specimens were reared from pupae of Euxesta eluta Loew (Diptera: Otitidae), attacked Bt sweet corn in Santa Fe province and other in Tucumán province (Argentina).
New species, cynipoid wasp, natural enemy, Otitidae , Zea mays L.
Eucoiline wasps are koinobiont endoparasitoids of dipterous Muscomorpha larvae and constitutes the most abundant and diverse subfamily of Figitidae. However, there has been poor taxonomic information on this subfamily in the Neotropical region, the only key to eucoiline genera cited for this region was published by
In Santa Fe province (Argentina), the crops of Bt sweet corn are attacked by species of Euxesta (Diptera: Otitidae) that are considered secondary pests, causing severe damage to sweet corn. Two species have been identified: E. mazorca Steycal and E. eluta Loew, both appearing simultaneously and producing serious losses (
We studied a total of 72 specimens (46 females and 27 males). The specimens from Santa Fe province were obtained from pupae of Euxesta eluta in the framework of the research project CAI +D 2011: 2011:501 201 101 00009 LI (Universidad Nacional del Litoral, Argentina). The larvae of Euxesta eluta were collected in a commercial crop of sweet Bt corn (hybrid=GSS0974). Each pupa was individually placed in Eppendorf®vials (1.5mm), with a damp paper inside in order to conserve moisture. The pupae were periodically reviewed to determine the emergence of adult flies or parasitoids. Once the parasitoids emerged, they were preserved in 70% EtOH, together with the host puparia, the adult specimens of the flies host emerging from other non attacked pupae were preserved in 70% EtOH. The terminology used in the description follows
This new genus can be separated from other Ganaspini by the following combination of characters: occiput diagonally striate; female antenna clavate, club consisting of six flagellomeres; male antenna with F1 modified and longer than F2; dorsal surface of scutellum areolate-punctate, posterior border of disc bluntly rounded; lateral bars of scutellum striate; dorsal surface of scutellar plate with midpit placed close posterior margin of plate, with two or three punctures on each side, with a setae on either side; forewings hyaline, apical margin with hair fringe, marginal cell closed; base of syntergum with hairy ring present; and micropunctures present on posterior1/3 of the syntergum.
Holotype of Euxestophaga argentinensis Gallardo sp. n. Female. 1 Habitus (lateral view) 2 Head and mesosoma (dorsal view), arrow indicates posterior margin of gena distinct, but not carinata 3 Head (posterior view) and mesosoma (dorsal view), arrow indicates basal margin of forewing lacking hair fringe. Male 4 Antenna, arrow indicates posterior margin of scutellum bluntly rounded.
Euxestophaga argentinensis Gallardo, sp. n.
Body stout, shiny. Head massive, subcircular in anterior view, broader than mesosoma, nearly glabrous. Toruli not projecting. Ocellar tubercle not prominent. Ocellar hair patches absent. Compound eyes glabrous. Inner orbital furrows present. Posterior margin of gena distinct, but not carinate. Occiput diagonally striate. Malar spaces smooth, without conical protuberances. Malar sulci present. Female antenna with 13 segments, club consisting of six flagellomeres; male antennae 15 segments, filiform. Shape of dorsal margin of pronotal plate in anterior view broadly truncate, emarginate. Mesoscutum longer than wide, quite arcuate, without median mesoscutal carinae, with rows of punctures in position of notauli, parascutal impressions incomplete. Shape of posterior part of scutellum in dorsal view bluntly rounded. Lateral bars of scutellum striate. Scutellar foveae wider than long, deep and large. Dorsal surface of scutellum areolate-puntate. Scutellar plate suboval, posterior margin rounded, dorsal surface with midpit placed close posterior margin of plate, with punctures on each side, with a setae on either side. Anteroventral cavity of metapleuron subcircular, setose. Forewings of normal size, hyaline, apical margin with hair fringe, basal margin lacking hair fringe, with membrane pubescence mostly reduced hair bases, marginal cell closed, longer than broad. Metasoma sessile; base of syntergum with hairy ring present, remainder of metasoma glabrous. Micropunctures present on posterior 1/3 of the syntergum more or less visible.
Neotropical region: Argentina. According to the biogeography scheme of
Specimens of this new genus and species were reared from Euxesta eluta on Zea mays L. (Bt sweet corn).
In reference to genus of the host, Euxesta and “phagein”, to eat. Gender: feminine.
Within Ganaspini, Euxestophaga is similar in morphology to Epicoela Borgmeier and Striatovertex Schick, Forshage and Nordlander, all of them present occiput diagonally striate, dorsal margin of pronotal plate emarginated, forewing with erect setae on subcostal and membrane with pubescence reduced. Epicoela includes two species known from Neotropical region, whereas Striatovertex is a genus widespread in the New World, with 13 species in total; one species in Australia, and other introduced in Hawaii from North America (
The three genera can be separated by the following characters:
1 | Female antenna with F5 or F6 to F11 moniliform, club consisting of 6 or 7 flagellomeres (Figure |
Epicoela Borgmeier |
– | Female antenna with F4 or F6 to F11 moniliform, club consisting of 6 or 8 flagellomeres. Dorsal surface of scutellar plate with punctures on each side with setae either one. Lateral bars of scutellum striate | 2 |
2 | Female antenna with F4 to F11 moniliform, club consisting of 8 flagellomeres. Scutellar plate posteriorly arched in lateral view (See Figure |
Striatovertex Schick, Forshage & Nordlander |
– | Female antenna with F6 to F11 moniliform, club consisting of 6 flagellomeres. Scutellar plate straight in lateral view (Figure |
Euxestophaga Gallardo, gen. n. |
ARGENTINA. Santa Fe. Angel Gallardo. 31°33'18"S; 60°40'36.84"W (DMS). Holotype female (
Female. Total length 1.85–2 mm. (Fig.
Head (Figs
Mesoscutum. Strongly convex in profile (Fig.
Mesopectus (Fig.
Mesoscutellum. Scutellar foveae (Fig.
Metapectal-propodeal complex (Fig.
Wings. Forewings hyaline (Fig.
Legs (Fig.
Metasoma (Fig.
Male. Similar to female. Male antennae (Fig.
Argentina.
Angel Gallardo (Argentina, Santa Fe province).
DipteraOtitidae: Euxesta eluta Loew.
In reference to the country where the specimen was collected: Argentina.
We thank Daniel Aquino (
Term | Concept | URI | References | Preferred Term |
antenna | The appendage that is composed of ringlike sclerites and the anatomical structures encircled by these sclerites and that is articulated with the cranium. | http://purl.obolibrary.org/obo/HAO_0000101 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | antenna |
club | The anatomical cluster that is composed of apical flagellomeres bearing multiporous plates in female organism. | http://purl.obolibrary.org/obo/HAO_0000203 | Masner, L. 1980. Key to genera of Scelionidae of the Holarctic region, with descriptions of new genera and species (Hymenoptera: Proctotrupoidea). Memoirs of the Entomological Society of Canada 113:1-54. | clava |
The a anatomical cluster that is composed of one or more enlarged flagellomeres. | http://purl.obolibrary.org/obo/HAO_0000208 | Yoder, M. J. 2009. Curator. Hymenoptera Anatomy Ontology. | club | |
The anatomical cluster composed of the apical flagellomeres that are differentiated by size from the basal flagellomeres. | http://purl.obolibrary.org/obo/HAO_0001185 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | clava | |
forewing | The wing that is located on the mesothorax. | http://purl.obolibrary.org/obo/HAO_0000351 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | fore wing |
The area that is located anteriorly on a wing. | http://purl.obolibrary.org/obo/HAO_0000352 | Deans, A. R. 2009. HAO curator.. | forewing | |
genal carina | The carina that extends on the gena from the lateral margin of the oral foramen. | http://purl.obolibrary.org/obo/HAO_0001755 | Gibson , G. A. P., J. D. Read , and R. Fairchild. 1998. Chalcid wasps (Chalcidoidea): illustrated glossary of positional and morphological terms ..; Buffington, M. L. 2009. Description, circumscription and phylogenetics of the new tribe Zaeucoilini (Hymenoptera: Figitidae: Eucoilinae), including a description of a new genus . Systematic Entomology 34:162-187.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | genal carina |
mesopleural triangle | The area that is limited dorsally by the subalar ridge, posteroventrally by the speculum and ends posteriorly in the subalar pit. | http://purl.obolibrary.org/obo/HAO_0000562 | Buffington, M. L. 2009. Description, circumscription and phylogenetics of the new tribe Zaeucoilini (Hymenoptera: Figitidae: Eucoilinae), including a description of a new genus . Systematic Entomology 34:162-187.; Ronquist, F., and G. Nordlander. 1989. Skeletal morphology of an archaic cynipoid, Ibalia rufipes (Hymenoptera: Ibaliidae). Entomologica Scandinavica, Supplement 33:1-60.; Deans, A. R. 2009. HAO curator.. | mesopleural triangle |
mesopleuron | The area that is located laterally of the mesodiscrimen. | http://purl.obolibrary.org/obo/HAO_0000566 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Vilhelmsen, L. B., I. Miko, and L. Krogmann. 2010. Beyond the wasp waist: structural diversity and phylogenetic significance of the mesosoma in apocritan wasps (Insecta: Hymenoptera). Zoological Journal of the Linnean Society [=Journal of the Linnean Society of London, Zoology] 159:22-194.; Mikó, I., L. Vilhelmsen, N. F. Johnson, L. Masner , and Z. Pénzes. 2007. Morphology of Scelionidae (Hymenoptera: Platygastroidea): head and mesosoma. Zootaxa 1571:1-78.; Gibson , G. A. P., J. D. Read , and R. Fairchild. 1998. Chalcid wasps (Chalcidoidea): illustrated glossary of positional and morphological terms . | mesopleuron |
The pleuron that is located in the mesothorax. | http://purl.obolibrary.org/obo/HAO_0001354 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp. | mesopleuron | |
The lateral (vertical) area that is anterior to the mesometapleural sulcus and posterior to the pronotum. | http://purl.obolibrary.org/obo/HAO_0002363 | Csősz, S. 2015. Synopsis of East-Mediterranean representatives of Temnothorax nylanderi species-group. in prep. | mesopleural area of the mesonoto-metanoto-mesopecto-metapecto-propodeal complex | |
mesoscutellum | The scutellum that is located on the mesonotum. | http://purl.obolibrary.org/obo/HAO_0000574 | Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius (Hymenoptera: Braconidae), with a Discussion of Terminology. PLoS ONE 7:e32573. | mesoscutellum |
mesoscutum | The scutum that is located on the mesonotum. | http://purl.obolibrary.org/obo/HAO_0000575 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius (Hymenoptera: Braconidae), with a Discussion of Terminology. PLoS ONE 7:e32573. | mesoscutum |
metapleuron | The area of the metapectal-propodeal complex that is located laterally of the metadiscrimen. | http://purl.obolibrary.org/obo/HAO_0000621 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | metapleuron |
The area of the metapectal-propodeal complex that is located anterior to the metapleural carina and the ventral propodeal carina and lateral to the metadiscrimen. | http://purl.obolibrary.org/obo/HAO_0001271 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Mikó, I., L. Vilhelmsen, N. F. Johnson, L. Masner , and Z. Pénzes. 2007. Morphology of Scelionidae (Hymenoptera: Platygastroidea): head and mesosoma. Zootaxa 1571:1-78. | metapleuron | |
The area of the metapectal-propodeal complex that is located anteriorly of the metapleural sulcus and laterally of the metadiscrimen. | http://purl.obolibrary.org/obo/HAO_0001272 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Vilhelmsen, L. B. 2000. Before the wasp-waist: Comparative anatomy and phylogenetic implications of the skeleto-musculature of the thoraco-abdominal boundary region in basal Hymenoptera (Insecta) . Zoomorphology [was Zeitschrift für Morphologie der Tiere] 119:185-221. | metapleuron | |
The area that is located laterally of the metadiscrimen, this class is obsolete. | http://purl.obolibrary.org/obo/HAO_0001273 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Vilhelmsen, L. B. 2000. Before the wasp-waist: Comparative anatomy and phylogenetic implications of the skeleto-musculature of the thoraco-abdominal boundary region in basal Hymenoptera (Insecta) . Zoomorphology [was Zeitschrift für Morphologie der Tiere] 119:185-221. | metapleuron | |
The area of the metapectal-propodeal complex that is limited ventrally by the ventral carina of the metapleuron and dorsally by the metapleural carina. | http://purl.obolibrary.org/obo/HAO_0001869 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | metapleuron | |
The area of the metapectal-propodeal complex that is anterior to the metapleural carina and lateral to the metadiscrimen. | http://purl.obolibrary.org/obo/HAO_0002298 | Buffington, M., and M. Forshage. 2014. The description of Garudella Buffington and Forshage, new genus (Hymenoptera: Figitidae: Eucoilinae).. | metapleuron | |
The lateral (vertical) area that is posterior to the mesometapleural sulcus and anterior to the metapleural carina. | http://purl.obolibrary.org/obo/HAO_0002360 | Csősz, S. 2015. Synopsis of East-Mediterranean representatives of Temnothorax nylanderi species-group. in prep. | metapleural area of the mesonoto-metanoto-mesopecto-metapecto-propodeal complex | |
midpit | The depression that is located posteromedially on the mesoscutum. | http://purl.obolibrary.org/obo/HAO_0000637 | Sharkey, M.J. and R.A. Wharton 1997. Morphology and terminology. Pages 19-38. In: Wharton, R.A., P.M. Marsh, and M.J. Sharkey (Eds), Manual of the New World genera of Braconidae (Hymenoptera). Special Publication of the International Society of Hymenopterists. Vol. 1: 1-439 pp.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | midpit |
The area that is concave is located medially on the scutellar plate and corresponds to the opening of an exocrine gland. | http://purl.obolibrary.org/obo/HAO_0001678 | Buffington, M. L., and S. J. Sheffer. 2008. North American species of Agrostocynips Diaz (Hymenoptera: Figitidae: Eucoilinae), parasitoids of Agromyzidae (Diptera): bionomics and taxonomy . Zootaxa 1817:39-48. | scutellar midpit | |
occiput | The area that is concave and surrounds the postocciput. | http://purl.obolibrary.org/obo/HAO_0000658 | Goulet, H., and J. T. Huber. 1993. Hymenoptera of the World: An Identification Guide to Families. Research Branch, Agriculture Canada Publication 1894/E., Ottawa, ON 668 pp.; Deans, A. R. 2009. HAO curator.. | occiput |
pronotal plate | The area of the pronotum that is median, raised and limited laterally by sharp edges. | http://purl.obolibrary.org/obo/HAO_0000838 | Goulet, H., and J. T. Huber. 1993. Hymenoptera of the World: An Identification Guide to Families. Research Branch, Agriculture Canada Publication 1894/E., Ottawa, ON 668 pp.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | pronotal plate |
pronotum | The notum that is located in the prothorax. | http://purl.obolibrary.org/obo/HAO_0000853 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius (Hymenoptera: Braconidae), with a Discussion of Terminology. PLoS ONE 7:e32573. | pronotum |
scutellar fovea | The depression that is medially located on the scutoscutellar suture. | http://purl.obolibrary.org/obo/HAO_0000916 | Ronquist, F., and G. Nordlander. 1989. Skeletal morphology of an archaic cynipoid, Ibalia rufipes (Hymenoptera: Ibaliidae). Entomologica Scandinavica, Supplement 33:1-60.; Buffington, M. 2007. The occurence and phylogenetic implications of the ovipositor clip with the Figitidae. Journal of Natural History 41:33-36.; Deans, A. R. 2009. HAO curator.. | scutellar fovea |
scutellar plate | The area that is located medially on the mesoscutellum, flat and surrounds the scutellar midpit. | http://purl.obolibrary.org/obo/HAO_0001230 | Buffington, M. L. 2009. Description, circumscription and phylogenetics of the new tribe Zaeucoilini (Hymenoptera: Figitidae: Eucoilinae), including a description of a new genus . Systematic Entomology 34:162-187.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | scutellar plate |
scutellum | The scutellum that is located on the mesonotum. | http://purl.obolibrary.org/obo/HAO_0000574 | Gibson , G. A. P., J. D. Read , and R. Fairchild. 1998. Chalcid wasps (Chalcidoidea): illustrated glossary of positional and morphological terms ..; Curators, H. A. O. 2009. The Hymenoptera Anatomy Ontology Curation Team. Hymenoptera Anatomy Ontology. | mesoscutellum |
The area that is located posteriorly of the transscutal line and is composed of the axillae and the mesoscutellum. | http://purl.obolibrary.org/obo/HAO_0000572 | Masner, L., and J. L. GarcÃa. 2002. The genera of Diapriinae (Hymenoptera: Diapriidae) in the new world. Bulletin of the American Museum of Natural History 268:107-138. | mesoscutellar-axillar complex | |
The area that is located posteriorly of the scutoscutellar suture. | http://purl.obolibrary.org/obo/HAO_0001229 | Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | scutellum | |
subalar pit | The pit that is located posterodorsally on the mesopectus corresponds to the posterodorsal edge of the mesopleuron. | http://purl.obolibrary.org/obo/HAO_0000961 | Gibson , G. A. P., J. D. Read , and R. Fairchild. 1998. Chalcid wasps (Chalcidoidea): illustrated glossary of positional and morphological terms ..; Mikó, I., L. Vilhelmsen, N. F. Johnson, L. Masner , and Z. Pénzes. 2007. Morphology of Scelionidae (Hymenoptera: Platygastroidea): head and mesosoma. Zootaxa 1571:1-78.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology.; Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius (Hymenoptera: Braconidae), with a Discussion of Terminology. PLoS ONE 7:e32573. | subalar pit |
syntergum | The sclerite that is composed of fused abdominal terga. | http://purl.obolibrary.org/obo/HAO_0000987 | Mikó, I., and A. R. Deans. 2009. Masner, a new genus of Ceraphronidae (Hymenoptera, Ceraphronoidea) described using controlled vocabularies. ZooKeys 20:127-153.; Miko, I. 2009. -2014 Curator. Hymenoptera Anatomy Ontology. | syntergum |
GBIF
Data type: distribution