Butiokeras Burks & Heraty, 2020

Burks, Roger A. & Heraty, John M., 2020, First described fossil representatives of the parasitoid wasp taxa Asaphesinae n. n. and Eunotinae (Hymenoptera: Chalcidoidea: Pteromalidae sensu lato) from Eocene Baltic amber, Journal of Natural History 54 (9), pp. 801-812 : 807-808

Butiokeras Burks & Heraty n. gen.

( Figure 1 (d,e))

Type species: Butiokeras costae n. sp.

http://www.zoobank.org/ urn:lsid:zoobank.org:act:129BA554-88A2-4B60-A619-886B30AE7697

Diagnosis

Antennal flagellum in male with 1 anellus, 4 funiculars, and 3 clavomeres; all except the anellus with a row of many raised multiporous plate sensilla that span the length of their respective segment. Vertexal carina absent. Mesoscutum and mesoscutellum with fineraised reticulate sculpture. Fore wing densely setose, without speculum. Gaster not rigidly convex but apparently with more flexible terga; first gastral tergum short, not more than a third total gastral length, with lateral incision.

Description. Male. Head finely reticulate, with large subcircular eyes that are well separated and with ventral divergent medial margins, and gena short dorsally (thus head of shape typical for Eunotus Walker ). Eye reaching posterior margin of head dorsally; lateral ocelli not reaching posterior margin of vertex. Malar sulcus present. Clypeus weakly convex, with subapical groove near ventral margin (as in Eunotus ); labrum present and exposed, short and flap-like. Antennal flagellum with 1 very short anellus, 4 funiculars, 3 clavomeres, with each funicular and clavomere with raised multiporous plate sensilla extending the length of their flagellomere; flagellar setae short and appressed to their segment, therefore inconspicuous. Vertex somewhat abrupt posteriorly, but rounded and without vertexal carina.

Mesosoma dorsally finely reticulate. Pronotum without collar. Mesoscutum and mesoscutellum densely covered with short setae. Axilla slightly, but not strongly, advanced. Axillular sulcus carinate laterally. Fore wing entirely densely setose, without speculum. Prepectus subtriangular, reticulate. Mesopleural area with dorsal pit; mesepimeron elevated and nearly smooth. Marginal vein slightly more than twice stigmal vein length; postmarginal vein longer than stigmal vein but shorter than marginal vein; uncus long. Legs each with 5 tarsomeres; fore tibial spur stout and curved.

Metasoma about as long as head plus mesosoma; terga not rigidly convex but apparently with more flexible terga. First gastral tergum short, less than a third total gastral length; with lateral incision of the type frequently found in other chalcidoids (e.g. Perilampidae ) but not found in other Eunotini. Male genitalia with volsellar digiti and parameres.

Etymology. After the Greek words βυτίο = barrel, and ΚΈρας = horn. Refers to the multiporous plate sensilla of the antenna. Gender neuter.

Figures

Figure 1. (a–c) Coriotela lasallei n. gen., n. sp. holotype female: (a) Body, dorso-lateral; (b) Head, mesosoma, and anterior part of metasomal, lateral, frl = frenal groove, occ = occipital carina. (c) Fore wing, clv = clava, clavomeres numbered. (d,e) Butiokeras costae n. gen., n. sp. holotype male: (d) Body, dorso-lateral; (e) Body, ventro-lateral.