J. HYM. RES. Vol. 9(2), 2000, pp. 213-219 The Re-definition of Pimpline Genus Hymenoepimecis (Hymenoptera: Ichneumonidae) with a Description of a Plesiomorphic New Costa Rican Species Ian D. Gauld The Natural History Museum, Cromwell Road, London SW7 5BD, UK Abstract. — An aberrant new species of the Neotropical genus Hymenoepimecis, H. argyraphaga Gauld n. sp. is described from Costa Rica, and the genus is redefined to accommodate this new taxon. A key is provided to identify the Costa Rican species. It is hypothesised that H. argyraphaga occupies a basal position in the genus, and is the sister group to all other species. The systematic position of Hymenoepimecis within the Polysphincta genus-group is discussed and a sister-group relationship with Acrotaphus, another New World genus, is demonstrated. It is suggested that this clade has arisen from within a paraphyletic "Polysphincta" complex, a cosmopolitan group that has yet to be resolved as a series of monophyletic taxa. Host records for the clade are summarised, and it is shown that the group are specialist parasitoids of orb-web spiders of the families Ara-neidae and Tetragnathidae. Hymenoepimecis is an exclusively neo-tropical genus of ichneumonid wasps that belongs to the Polysphincta complex of genera, the "Polysphinctini" seiisu Townes (1969), a monophyletic clade that has aris-en from within the pimpline tribe Ephial-tini (Wahl and Gauld, 1998). This clade is biologically unique within the Ichneu-monidae because all members are koino-biont ectoparasitoids of spiders (Fitton et al. 1988; Gauld 1991; Gauld et al. 1998). Elsewhere in the Hymenoptera such an as-sociation is only known in a few Pompi-lidae (Wasbauer 1995). The female ichneu-monid temporarily paralyses a spider by stinging it, and then attaches an egg either to the cephalothorax (the Schizopyga/ Dreisbachia subgroup) or to the abdomen (the Polysphincta and Zatypota subgroups). The ichneumonid larva develops as an ec-tophagous parasitoid on the active spider. The Hymenoepimecis of southern Mesoa-merica are reasonably well-known (Gauld 1991; Gauld et al. 1998), but recently, a new species of has been found in Costa Rica which possesses certain plesiomorph-ic features that necessitate redefining the genus. The purpose of this paper is to do this, and to describe and characterise this new species, in order to provide a taxo-nomic background for the following paper (Eberhard, 2000) which describes the bi-ology of these fascinating insects. Genus Hymenoepimecis Viereck Epimecis Brulle 1846: 112. Type-species: Epimecis bicolor Brulle, designated by Ashmead 1900: 54. Qunior homonym of Epimecis Hiibner.] Hymenoepimecis Viereck 1912: 149. [Replace-ment name for Epimecis Brulle.] Diagnosis. — Medium to large insects (fore wing length 6-14 mm) which are generally orange with black marking, with the wings from more or less hyaline to completely black, occasionally black and yellow patterned. Head somewhat glo-bose, though abruptly declivous posteri-orly; clypeus simple, not transversely di-vided, flat, apically truncate or slightlv concave; mandible slender, strongly ta-pered with upper tooth distinctly the lon-ger; palp formula 5:4; occipital carina very strong, dorsallv convex, flange-like, con-tinuous to base of mandible, with part just



The Re-definition of Pimpline Genus Hymenoepimecis (Hymenoptera: Ichneumonidae) with a Description of a Plesiomorphic New Costa Rican Species

Ian D Gauld
Journal of Hymenoptera Research 9: 213-219 (2000)

Reference added over 6 years ago



Page 213
Page 214
Page 215
Page 216
Page 217
Page 218
Page 219
One author per line, "First name Last name" or "Last name, First name"
Starting page
Ending page
blog comments powered by Disqus
Page loaded in 0.99485 seconds