Cerasommatidiidae BRETHES 1925
Creators: name: Arriaga-Varela, Emmanuel
name: Tomaszewska, Wioletta
name: Szawaryn, Karol
name: Robertson, James
name: Seidel, Matthias
name: Ślipiński, Adam
name: Fikáček, Martin
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerasommatidiidae

description: CERASOMMATIDIIDAE BRÈTHES, 1925 STAT. RESTORED
(FIGS 1–20)
Cerasommatidiidae Brèthes, 1925: 199.
Type genus: Cerasommatidia Brèthes, 1925 by original designation.
As synonym of Eupsilobiinae Casey, 1895: 452.– Pakaluk et al., 1994: 228; Shockley et al., 2009: 27; Bouchard et al., 2011: 372.
Diagnostic combination: Body short oval (0.80– 1.45 mm) and convex (Figs 3, 6, 12, 17). Head with frontoclypeal suture present (Figs 9A, 15B, 18B). Eyes coarsely faceted (Figs 4A, 5A, 7A, 9A, 15B, 16A, 17D). Antennal sockets visible from above (Figs 4A, 5A, 9A, 16A). Ventral antennal grooves deep between eyes and mouthparts (Figs 3C, 18B). Gular sutures short, widely separated, weakly convergent anteriorly (Figs 7A, 15A). Tentorium with anterior arms fused medially and widely divergent anteriorly, posterior arms connected throughout their length to posterior weakly sinuate transverse bridge/corpotentorium (Figs 3C, 7A, 17D). Antenna composed of 11 antennomeres with distinct two-antennomere club (Figs 3C, 5E, 7A, 11A, 12C, 13A, 15A, 18A). Labrum large, sparsely setose, rounded anteriorly with or without small, median emargination (Figs 7B, 10A, 13B, 15B, 18B). Maxillary palpi (Figs 3C, 5B, 7C, 9B, 10A, 13C, 15A, 17E) with four palpomeres: palpomere 1 small; palpomere 2 weakly transverse and somewhat bulbous; palpomere 3 transverse; terminal palpomere distinctly elongate, swollen near base and then narrowing/flattened laterally toward apex; apex with short, sclerotized sensilla. Mandible stout (Figs 7E, 13E, 17F), sclerotized, with two apical teeth and two small subapical teeth; prostheca large, membranous with fringe of stout setae along its inner margin and with a series of long sclerotized, teeth-like projections apically; mola large, strongly sclerotized, with distinct transverse ridges. Labium with mentum irregularly hexagonal, with anterior margin straight, surface flat; prementum weakly elongate, sclerotized with ligula submembranous, lobed at sides (Figs 5B, 7D, 9B, 10A, 15A). Palpi with three palpomeres, widely separated by a distance more than width of palpiger: palpomere 1 smallest, palpomere 2 bulbous, palpomere 3 sometimes slightly bulbous.
Pronotum strongly transverse, widest at or near base and strongly convergent anteriorly (Figs 3A, 4B, 5C, 10C, 11B, 18C). Front angles weakly produced anteriorly, obtuse; hind angles often with small, oblique indentation to receive humeral corner of elytron. Prosternum large, in form of chin piece covering mouthparts (Figs 5D, 7F, 9D, 10B, 11C, 15D, 16C, 18D); prosternal process narrowest in about its half-length, continuously widened apically, provided with raised, paired lateral carinae or single median carina. Hypomeron with deep and long antennal grooves (Figs 7F, 9D, 10B, 15D, 18D). Mesoventral intercoxal process widely separates mesocoxae. Mesocoxa circular in outline, its cavity outwardly open; trochantin concealed (Figs 3D, 4E, 5H, 7I, 9F, 10E, 11F, 13D, 15G, 16D, 17G, 18E). Meso-metaventral junction arcuate anteriorly. Metaventrite strongly transverse, weakly convex, without postcoxal lines. Metanepisternum with small, outer blunt projection near anterior margin (Figs 3D, 7I, 17G). Metacoxae transverse, widely separated (Figs 3D, 7I, 9F, 10F, 16D, 18E). Metendosternite with short stalk and widely separated anterior arms and anterior tendons (Fig. 7J, 13D). Epipleura not foveate. Legs with trochanterofemoral attachment subheteromeroid (Figs 3D, 5H, 7K, 9F, 10F, 11F, 13D, 15D, 16D, 18E). Tibiae slender, gradually weakly widening towards tarsus; surrounded by short, stout spines. Tarsal formula 4-4- 4 in both sexes with tarsomere 1 weakly and tarsomere 2 distinctly lobed ventrally, tarsomere 3 short and tarsomere 4 about as long as tarsomere 1 (Figs 4F, 5F, 7L, 10D, 11E, 15E, 18G). Claws toothed at base (Figs 5F, 13F, 15E, 16E).
Abdomen with six ventrites in both sexes (Figs 4G, 8M, 15H, 18G). Ventrite 1 with (Figs 3E, 4G, 5H, 7M) or without distinctly developed, rounded postcoxal lines (Figs 15H, 16F, 18G); at midline about as long as three next ventrites together. Ventrite 5 with posterolateral angles strongly produced backwards and somewhat overlapping antero-lateral parts of ventrite 6 (anterior margin of ventrite 6 much narrower than posterior margin of ventrite 5); ventrite 6 arcuate apically, surrounded by anterior margin of tergite VIII bent downwards, appearing as narrow, false ‘ventrite 7’. Male genital segment (IX) reduced but with strongly developed, sclerotized, long, narrow, single apophysis (Figs 3E, 8A, D, 14A, D, 17I). Aedeagus (Figs 3F, 8B, E, 14B, E, 17H) with penis resting on its side when retracted.Ovipositor of female genitalia without coxites (Figs 8C, G, 14C, F, 17J).
description: Published as part of Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta, Szawaryn, Karol, Robertson, James, Seidel, Matthias, Ślipiński, Adam & Fikáček, Martin, 2023, The resurrection of Cerasommatidiidae, an enigmatic group of coccinelloid beetles (Coleoptera: Coccinelloidea) based on molecular and morphological evidence, pp. 1078-1115 in Zoological Journal of the Linnean Society 197 (4) on pages 1086-1087, DOI: 10.1093/zoolinnean/zlac082, http://zenodo.org/record/7814127