Chryasus Champion
Creators: name: Prena, Jens
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Chryasus

description: Synopsis of named species
Chryasus bicolor (Bondar, 1946) comb. n. (from Preglyptobaris) = Prospoliata bicolorata Hustache, 1950 syn. n.
Chryasus bicuspis Prena sp. n.
Chryasus bruniceps (Bondar, 1946) comb. n. (from Sphenobaris, originally Amphibaris) Chryasus carinulosus (Casey, 1922) comb. n. (from Psiona)
Chryasus cavernosus Champion, 1908
Chryasus clunis Prena sp. n.
Chryasus densus (Casey, 1922) comb. n. (from Psiona) = Psiona opaca Casey, 1922 syn. n.
Chryasus macer Prena sp. n.
Chryasus montyi Prena sp. n.
Chryasus multistriatus (Chevrolat, 1880) comb. n. (from Psiona, originally Baris) Chryasus nimius Prena sp. n.
Chryasus persimilis Prena sp. n.
Chryasus plagiatus Champion, 1908
Chryasus pomponella Prena sp. n.
Chryasus sculpturatus (Casey, 1922) comb. n. (from Aniops)
Chryasus taironius Prena sp. n.
Chryasus talamanca Prena sp. n.
Chryasus wappesi Prena sp. n.
1 Pronotum humped, highly arched in lateral view; body length 4.3–6.4 mm ....................................... 2
- Pronotum not humped; body length 1.9–3.4 mm ............................................................ 6
2 Elytron or pronotum reddish............................................................................ 3
- Elytron and pronotum black............................................................................ 5
3 Pronotum red with subtly vermiculate disc, procoxae separated by distinctly less than their own width................................................................................................... 1. C. bicolor (Bondar)
- Pronotum black with interspaces modified as pronounced ridges, procoxae separated by their own width (Fig. 15)........ 4
4 Elytron entirely reddish brown, pronotum less humped, male metaventrite projected anteriorly and deeply cleft by discrimen..................................................................................... 2. C. bicuspis sp. n.
- Elytron reddish brown with broad yellow ochre fascia in middle, pronotum excessively humped, male metaventrite tumid and not cleft by discrimen............................................................... 3. C. pomponella sp. n.
5 Body slender, elytra almost 1.4x longer than wide; Costa Rica ................................... 4. C. nimius sp. n.
- Body stout, elytra less than 1.3x longer than wide; northeastern South America..................... 5. C. wappesi sp. n.
6 Pronotal disc with punctation subsumed in narrow furrows, interspaces forming oblique vermicular ridges.............. 7
- Pronotal disc with punctation mostly separate, interspaces forming at most a few short oblique ridges................. 15
7 Body short rhomboidal, greatest width at humeri and rapidly narrowing from there; distance between procoxae subequal to distance between procoxa and anterior pronotal constriction (Fig. 14)............................................ 8
- Body elongate, more gently or not at all narrowing in basal third behind humeri; distance between procoxae shorter than distance between procoxa and anterior pronotal constriction (Fig. 13).......................................... 10
8 Elytron black with reddish vitta on interstriae 2–6................................................ 6. C. plagiatus
- Integument plain brown................................................................................ 9
9 Male with antenna inserted in distal third of rostrum; Brazil ....................................... 7. C. bruniceps
- Male with antenna inserted at mid-length of rostrum......... [unassigned specimens from Costa Rica (Fig. 33) and Brazil]
10 Integument glossy, microreticulation inconspicuous; pronotum with punctation completely subsumed in longitudinal channels; elytral disc with pronounced, angularly raised interstriae..................................................... 11
- Integument matte, microreticulate; pronotum with punctation vestigial but present; elytral disc with less pronounced, often only finely ridged interstriae............................................................................... 12
11 Body slightly stouter, red and/or black, elytron with ochre median fascia; pronotum proportionately larger and wider......................................................................................... 8. C. talamanca sp. n.
- Body very slender, black; pronotum notably small............................................. 9. C. macer sp. n.
12 Pronotum subconical; eyes bulging; integument red, elytron with indistinct subbasal fascia; Lesser Antilles (Guadeloupe)....................................................................................... 10. C. multistriatus
- Pronotum with sides convex; eyes flat; elytron without fascia; distribution continental............................. 13
13 Elytron reddish ochre, pronotum and ventrites darker; Colombia .............................. 11. C. taironius sp. n.
- Integument plain brown; distribution different............................................................. 14 14 Integument chestnut brown; total length 2.6 mm; Brazil ........................................ 12. C. carinulosus
- Integument darker, fuscous; total length 2.9–3.3 mm; Costa Rica ................................ 13. C. montyi sp. n.
15 Pronotal disc and elytral striae coarsely punctate........................................................... 16
- Pronotal disc and elytral striae shallowly punctate.......................................................... 17
16 Pronotal collar with deep pits separated by longitudinal ridges; Central America..................... 14. C. cavernosus
- Pronotal collar without deep pits; Mato Grosso (Brazil)............................................. 15. C. densus
17 Appendages comparatively long, rostrum almost 3x as long as eye; total length 2.1–2.8 mm; Central America.......... 18
- Appendages shorter, rostrum 2x as long as eye; total length 1.8–2.5 mm; Central and South America.................. 19
18 Male ventrite 5 strikingly tumid; pronotum and elytron with microscopic setae; femoral denticles developed; Cordilleras de Guanacaste and Tilarán in Costa Rica ...................................................... 16. C. clunis sp. n.
- Male ventrite 5 not tumid.................. [unassigned specimens from Costa Rica and elsewhere in Central America]
19 Elytra with sides converging from basal third to apex; femoral denticles distinct; Costa Rica ....... 17. C. persimilis sp. n.
- Elytra subparallel in basal half; femoral denticles obsolete; South America...................................... 20
20 Pronotum and elytron with white setae about 5–6x longer than wide; Mato Grosso, Brazil ............ 18. C. sculpturatus
- Pronotum and elytron with shorter setae............ [unassigned specimens from Brazil (Fig. 47) and Colombia (Fig. 48)]
description: Published as part of Prena, Jens, 2024, Consolidation of Aniops Casey, Psiona Casey, Preglyptobaris Bondar and Prospoliata Hustache with Chryasus Champion (Coleoptera, Curculionidae, Baridinae) and descriptions of new species, pp. 1-24 in Zootaxa 5492 (1) on pages 20-22, DOI: 10.11646/zootaxa.5492.1.1, http://zenodo.org/record/13211499