Abstract
A key is provided to 16 recognized species groups, plus several species not assigned to species group, of Orasema Cameron (Eucharitidae), a widespread New World genus of myrmicine ant (Formicidae: Myrmicinae) parasitoids ranging from northern Argentina to southern Canada. Eight of the species groups are revised, of which five are newly established; keys are given to the species of each treated group, 22 species are newly described, and detailed life histories of several well-documented species are discussed. Revised are the Orasema coloradensis group (four species: O. coloradensis Wheeler, O. iridescens n. sp., O. scaura n. sp., and O. violacea Ashmead), the Orasema bakeri group (six species: O. bablyi n. sp., O. bakeri Gahan, O. dubitata n. sp., O. polymyrmex n. sp., O. taii Chien & Heraty, and O. texana Gahan), the Orasema tolteca group (two species: O. castilloae n. sp. and O. tolteca Mann), the Orasema sixaolae group (newly established, with four species: O. brachycephala n. sp., O. nebula n. sp., O. sixaolae Wheeler & Wheeler, and O. tinalandia n. sp.), the Orasema acuminata group (newly established, with two species: O. acuminata n. sp. and O. cerulea n. sp.), the Orasema peraltai group (newly established, with two species: O. chrysozona n. sp. and O. peraltai n. sp.), the Orasema johnsoni group (newly established, with two species: O. johnsoni n. sp. and O. spyrogaster n. sp.), and the Orasema heacoxi group (newly established, with two species: O. heacoxi n. sp. and O. masonicki n. sp.). Newly described or treated species not placed to species group are O. brasiliensis (Bréthes), O. cirrhocnemis n. sp., O. monstrosa n. sp., O. mutata n. sp., O. psarops n. sp., and O. roppai n. sp. Species concepts and relationships are based on morphology and a recently published molecular phylogeny.
References
Ashmead, W.H. (1888) Descriptions of three new eucharids from Florida, with generic table of the Eucharinae. Entomologica Americana, 3, 186–188.
Ashmead, W.H. (1904) Classification of the chalcid flies or the superfamily Chalcidoidea, with descriptions of new species in the Carnegie Museum, collected in South America by Herbert H. Smith. Memoirs of the Carnegie Museum, 1, 225–533.
https://doi.org/10.5962/bhl.title.10341
Ayre, G.L. (1957) Ecological notes on Formica subnitens Creighton (Hymenoptera: Formicidae). Insectes Sociaux, 4, 173–176.
https://doi.org/10.1007/BF02222151
Ayre, G.L. (1958) Notes on insects found in or near nests of Formica subnitens Creighton (Hymenoptera: Formicidae) in British Columbia. Insectes Sociaux, 5, 1–7.
https://doi.org/10.1007/BF02222426
Ayre, G.L. (1959) Food habits of Formica subnitens Creighton (Hymenoptera: Formicidae) at Westbank, British Columbia. Insectes Sociaux, 4, 105–114.
https://doi.org/10.1007/BF02225946
Baker, A.J., Heraty, J.M., Mottern, J., Zhang, J., Hines, H.M., Lemmon, A.R. & Lemmon, E.M. (2020) Inverse dispersal patterns in a group of ant parasitoids (Hymenoptera: Eucharitidae: Oraseminae) and their ant hosts. Systematic Entomology, 45, 1–19.
https://doi.org/10.1111/syen.12371
Bouček, Z. (1988) Australasian Chalcidoidea (Hymenoptera). A biosystematic revision of genera of fourteen families, with a reclassification of species. CAB International, Wallingford, 832 pp.
Brèthes, J. (1927) Hymenopteres Sud-Americains du Deutches Entomologisches Institut: Terebrantia. Entomologische Mitteilungen, 16, 319–335.
Burks, R.A., Heraty, J.M., Dominguez, C. & Mottern, J.L. (2018) Complex diversity in a mainly tropical group of ant parasitoids: revision of the Orasema stramineipes species group (Hymenoptera: Chalcidoidea: Eucharitidae). Zootaxa, 4401 (1), 1–107.
https://doi.org/10.11646/zootaxa.4401.1.1
Burks, R.A., Heraty, J.M., Mottern, J., Dominguez, C. & Heacox, S. (2017) Biting the bullet: revisionary notes on the Oraseminae of the Old World (Hymenoptera, Chalcidoidea, Eucharitidae). Journal of Hymenoptera Research, 55, 139–188.
https://doi.org/10.3897/jhr.55.11482
Burks, R.A., Mottern, J. & Heraty, J.M. (2015) Revision of the Orasema festiva species group (Hymenoptera: Chalcidoidea: Eucharitidae). Zootaxa, 3972 (4), 521–534.
https://doi.org/10.11646/zootaxa.3972.4.4
Cameron, P. (1884) Hymenoptera (Families Tenthridinidae–Chrysididae). In: Goodman, F.D. & Salvin, D. (Eds.), Biologia centrali-americana. Insecta Hymenoptera. Taylor and Francis, London, pp. 1–487.
Cameron, P. (1909) A contribution to the knowledge of the parasitic Hymenoptera of Argentina. Transactions of the American Entomological Society, 35, 419–450.
Carey, B., Visscher, K. & Heraty, J.M. (2012) Nectary use for gaining access to an ant host by the parasitoid Orasema simulatrix (Hymenoptera, Eucharitidae). Journal of Hymenoptera Research, 27, 47–65.
https://doi.org/10.3897/jhr.27.3067
Chien, I. & Heraty, J.M. (2018) Come and gone: Description of a new species of Eucharitidae (Hymenoptera) attacking Solenopsis (Hymenoptera: Formicidae) in Texas. Insect Systematics and Diversity, 2, 1–7.
https://doi.org/10.1093/isd/ixx012
Clausen, C.P. (1940) The oviposition habits of the Eucharidae (Hymenoptera). Journal of the Washington Academy of Sciences, 30, 504–516.
Clausen, C.P. (1941) The habits of the Eucharidae. Psyche, Cambridge, 48, 57–69.
https://doi.org/10.1155/1941/21539
Dalla Torre, K.W. (1898) Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. V. Chalcididae et. Proctotrupidae, Leipzig, 598 pp.
Eady, R.D. (1968) Some illustrations of microsculpture in the Hymenoptera. Proceedings of the Royal Entomological Society of London, Series A, General Entomology, 43, 66–72.
https://doi.org/10.1111/j.1365-3032.1968.tb01029.x
Gahan, A.B. (1940) A contribution to the knowledge of the Eucharidae (Hymenoptera: Chalcidoidea). Proceedings of the United States National Museum, 88, 425–458.
https://doi.org/10.5479/si.00963801.88-3086.425
Gahan, A.B. & Fagan, M.M. (1923) The type species of the genera of Chalcidoidea or chalcid-flies. Bulletin of the United States National Museum, 124, 1–173.
https://doi.org/10.5479/si.03629236.124.i
Gemignani, E.V. (1933) La familia «Eucharidae» (Hymenoptera: Chalcidoidea) en la República Argentina. Anales del Museo Nacional de Buenos Aires, 37, 277–294.
Ghesquière, J. (1946) Contribution à l’étude de microhyménoptères du Congo Belge. X. Nouvelles dénominations pour quelques genres de Chalcidoidea et Mymaroidea. Revue de zoologie et de botanique africaines, 39, 367–371.
Girault, A.A. (1913) More new genera and species of chalcidoid Hymenoptera from Paraguay. Archiv für Naturges, 79, 60–63.
Harris, R.A. (1979) A glossary of surface sculpturing. Occasional Papers in Entomology, 28, 1–31.
Heraty, J.M. (1985) A revision of the Nearctic Eucharitinae (Hymenoptera: Chalcidoidea: Eucharitidae). Proceedings of the Entomological Society of Ontario, 116, 61–103.
Heraty, J.M. (1990) Classification and evolution of the Oraseminae (Hymenoptera: Eucharitidae). Ph.D. Thesis. Department of Entomology, Texas A&M University, College Station, Texas, 335 pp.
Heraty, J.M. (1994) Classification and evolution of the Oraseminae in the Old World, including revisions of two closely related genera of Eucharitinae (Hymenoptera: Eucharitidae). Life Sciences Contributions, 157, 1–174.
https://doi.org/10.5962/bhl.title.53489
Heraty, J.M. (2000) Phylogenetic relationships of Oraseminae (Hymenoptera: Eucharitidae). Annals of the Entomological Society of America, 93, 374–390.
https://doi.org/10.1603/0013-8746(2000)093[0374:PROOHE]2.0.CO;2
Heraty, J.M. (2002) A revision of the genera of Eucharitidae (Hymenoptera: Chalcidoidea) of the world. Memoirs of the American Entomological Institute, 68, 1–359.
Heraty, J.M. (2019) Catalog of World Eucharitidae. 2019. University of California, Riverside, 113 pp. [https://hymenoptera.ucr.edu/Eucharitidae.html]
Heraty, J.M. & Baker, A.J. (2020) New species of Orasema (Hymenoptera: Eucharitidae) from Central and South America. Journal of Natural History, 54 (9-12), 735–754.
https://doi.org/10.1080/00222933.2020.1747651
Heraty, J.M. & Murray, E. (2013) The life history of Pseudometagea schwarzii, with a discussion of the evolution of endoparasitism and koinobiosis in Eucharitidae and Perilampidae (Chalcidoidea). Journal of Hymenoptera Research, 35, 1–15.
https://doi.org/10.3897/jhr.35.6025
Heraty, J.M., Wojcik, D.P. & Jouvenaz, D.P. (1993) Species of Orasema parasitic on the Solenopsis saevissima-complex in South America (Hymenoptera: Eucharitidae, Formicidae). Journal of Hymenoptera Research, 2, 169–182.
Heraty, J.M., Burks, R.A., Mbanyana, N. & Van Noort, S. (2018) Morphology and life history of an ant parasitoid, Psilocharis afra (Hymenoptera: Eucharitidae). Zootaxa, 4482 (3), 491–510.
https://doi.org/10.11646/zootaxa.4482.3.3
Herreid, J.S. & Heraty, J.M. (2017) Hitchhikers at the dinner table: a revisionary study of a group of ant parasitoids (Hymenoptera: Eucharitidae) specializing in the use of extrafloral nectaries for host access. Systematic Entomology, 42, 204–229.
https://doi.org/10.1111/syen.12206
Johnson, J.B., Miller, T.D., Heraty, J.M. & Merickel, F.W. (1986) Observations on the biology of two species of Orasema (Hymenoptera: Eucharitidae). Proceedings of the Entomological Society of Washington, 88, 542–549.
Kerrich, G.J. (1963) Descriptions of two species of Eucharitidae damaging tea, with comparative notes on other species (Hym., Chalcidoidea). Bulletin of Entomological Research, 54, 365–371.
https://doi.org/10.1017/S0007485300048872
Kirby, W.F. (1886) A synopsis of genera of the Chalcididae, subfamily Eucharinae, with descriptions of several new general and species of Chalcididae and Tenthredinidae. Journal of the Linnean Society, 20, 28–37.
https://doi.org/10.1111/j.1096-3642.1886.tb01433.x
Lachaud, J.-P. & Pérez-Lachaud, G. (2012) Diversity of species and behavior of hymenopteran parasitoids of ants: a review. Psyche, 2012, 1–24.
https://doi.org/10.1155/2012/134746
Mann, W.M. (1914) Some myrmecophilous insects from Mexico. Psyche, 21, 171–184.
https://doi.org/10.1155/1914/69251
Murray, E.A., Carmichael, A.E. & Heraty, J.M. (2013) Ancient host shifts followed by host conservatism in a group of ant parasitoids. Proceedings of the Royal Society Biological Sciences, Series B, 280, 20130495.
https://doi.org/10.1098/rspb.2013.0495
Peckham, G.W. & Peckham, E.G. (1892) Ant-like spiders of the Family Attidae. Occasional Papers of the Natural History Society of Wisconsin, 2, 1–84.
Schmiedeknecht, O. (1909) Hymenoptera für Chalcididae. Wytsman Genera Insectorum, 97, 1–550.
Strand, E. (1942) Miscellanea nomenclatoria zoologica et palaeontologica X-XII. Folia Zoologica und Hydrobiologica, 11, 386–402.
Vander Meer, R.K., Jouvenaz, D.P. & Wojcik, D.P. (1989) Chemical mimicry in a parasitoid (Hymenoptera, Eucharitidae) of fire ants (Hymenoptera, Formicidae). Journal of Chemical Ecology, 15, 2247–2261.
Wheeler, G.C. & Wheeler, E.W. (1937) New hymenopterous parasites of ants (Chalcidoidea: Eucharidae). Annals of the Entomological Society of America, 30, 163–175.
Wheeler, W.M. (1907) The polymorphism of ants, with an account of some singular abnormalities due to parasitism. Bulletin of the American Museum of Natural History, 23, 1–90.