Cydninae Billberg 1820
Creators: name: Avendaño, José Mauricio
name: Correia, Maíra Andrade
name: Grazia, Jocelia
name: Schwertner, Cristiano Feldens
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cydnidae

description: Key to the genera of Cydninae of the Western Hemisphere (adapted from Froeschner 1960)
1. Pronotum anteriorly with deep, sharply impressed line (sometimes enclosing punctures but usually impunctate) paralleling anterior margin from side to side, never broken in a row of punctures (Fig. 2E)......................... Pangaeus Stål.
1’. Pronotum anteriorly without a sharply impressed anterior line, although often with a row of punctures in the same area (rarely with partial, vague line laterally (Fig. 2A–D, F)............................................................. 2
2 (1’). Anterior part of osteolar peritreme modified apically into a distinctly differentiated loop, lobe, or band which is wider than basal part of peritreme and in part or wholly polished (Fig. 4A, C–H)................................................. 3
2’. Anterior part of peritreme without enlarged, differentiated apical structure, sometimes with a small, subapical, posterior hooklike or flaplike projection (Fig. 4B, I)................................................................. 9
3 (2). Osteolar peritreme with apical process elongate, transverse length three or more times width (Fig. 4E).................. 4
3’. Osteolar peritreme with apical process short, transverse length not more than two times width (Fig. 4B, D, F, H, I)........ 5
4 (3). Osteolar peritreme an elevated, troughlike structure extending almost to lateral margin of segment where it forms a recurved, polished lobe (Fig. 4E)................................................................... Chilocoris Dallas.
4’. Osteolar peritreme a transverse polished band, neither elevated, troughlike nor recurved apically (Fig. 4I)................................................................................................... Rhytidoporus Uhler.
5 (3’). Hemelytron with membrane occupying half its length (Fig. 3E)................................................. 6
5’. Hemelytron with membrane occupying less than one-third its length (Fig. 3A–D, F)................................ 7
6 (5). Terminal process of peritreme small, not elongate (Fig. 4D)....................................... Ectinopus Dallas.
6’. Terminal osteolar process large, elongate-oval, with one to three longitudinal rugae discally (Fig. 4C).... Cydnus Fabricius.
7 (5’). Metapleural evaporatorium very limited, just outlining peritreme, not approaching metapleural lamella posteriorly (Fig. 4G)...................................................................................... Microporus Uhler.
7’. Metapleural evaporatorium more extensive, occupying more than half of sclerite and nearly or quite reaching base of metapleural lamella posteriorly (Figs. 4A–F, H,I)...................................................................... 8
8 (7’). Terminal process of peritreme scoop-shaped or auricular, with ostiole conspicuously visible ventrally at its base (Fig. 4H)........................................................................................ Onalips Signoret.
8’. Terminal process of peritreme flat, simply expanded posteriorly as a more or less polished lobe, ostiole opening posteriorly, not conspicuous ventrally (Fig. 4F).......................................................... Melanaethus Uhler.
9 (2’). Posterior tibia conspicuously compressed, anterior and posterior faces glabrous, not spined; spines of posteroventral margin conspicuously longer, thinner, and more tapering than those of dorsal margin (Figs. 8A,D, 10A,D).................... 10
9’. Posterior tibia not or only weakly compressed; dorsal and ventral spines about equally developed (Fig. 3J)............. 11
10 (9). Labial segment II with large, semicircular, foliaceous lobe, this often hidden between anterior coxae (Fig. 8C)........................................................................................ Prolobodes Amyot & Serville.
10’. Labial segment II somewhat compressed, but without large, foliaceous lobe(Figs. 10D, 12D, 13D, 14D, 16D, 17D, 18D)............................................................................... Cyrtomenus Amyot & Serville.
11 (9’). Head with a complete row (extending from eye to apex of mandibular plate) of coarse, more or less contiguous punctures giving rise to numerous long hairs and usually also to a row of short, blunt pegs (Fig. 2F)............. Tominotus Mulsant & Rey.
11. Head without a complete row (absent or extending not more than three-fourths of way to apical angle of mandibular plate) of coarse setigerous punctures; pegs never present (Fig. 2D)....................................... Dallasiellus Berg.
description: Published as part of Avendaño, José Mauricio, Correia, Maíra Andrade, Grazia, Jocelia & Schwertner, Cristiano Feldens, 2024, Review and phylogeny of Cyrtomenus Amyot & Serville (Hemiptera: Cydnidae: Cydninae) based on morphological characters, pp. 301-340 in Zootaxa 5453 (3) on pages 315-316, DOI: 10.11646/zootaxa.5453.3.1, http://zenodo.org/record/11234163