Pachycerus
Creators: name: Meregalli, Massimo
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Pachycerus

description: KEY TO THE INDO-AFRICAN SPECIES OF PACHYCERUS   
1. Elytral scales simple, lanceolate, or aciculate......................................................................................... 2  
– Elytral scales bifid, at least in apical half..............................................................................................5  
 2. Micropterous, scales round, very dense, whitish, completely covering integument. Length 10.6 mm. Somalia................................ Pachycerus somaliensis Meregalli, 2002 (see Meregalli, 2002 for the description and data)   
– Macropterous, scales elliptical, not hiding integument on the whole surface.................................................3  
 3. Sides of pronotum widened anteriorly before apex and with a large, sharply conical tubercle at mid-length. Length: 7.0– 8.9 mm. Madagascar....................................................................................................................................................................................................................... Pachycerus badeni (Faust, 1888)   
– Sides of pronotum not widened anteriorly before apex, and with a small, scarcely prominent hump at mid-length........................................................................................................................................................4  
 4. Elytra with four very distinct round black spots, two near humeri and two on declivity; pronotum devoid of vestiture on disc; underside of rostrum with pentafid scales. Length: 12.0 mm (probably with rostrum). Yemen....................................................................................................................... Pachycerus efflatouni (Tewfik, 1942)   
 – Elytra lacking distinct bare round spots on humeri and declivity; pronotum with vestiture of whitish scales on disc; underside of rostrum with bifid scales. Length: 7.5–10.4 mm. Sahel regions of Africa..................................................................................................................................................  Pachycerus sahelicus sp. nov.    
 5. Elytra with dense, long, erect setae, as long as the intervals, in several series on odd intervals, and in one series on even intervals. Length: 9.2–10.3 mm. Sudan; West Africa....................... Pachycerus vestitus Fåhraeus, 1842   
– Elytra without setae or with short, moderately distinct setae....................................................................6  
6. Elytra with short but distinct semi-erect setae; scales bifid, nearly from base.............................................. 7  
– Setae on elytra microscopic, indistinct or shorter than the scales; scales bifid, connected up to mid-length........8  
 7. Sides of vertex raised above eyes. Length: 5.9–8.7 mm. India, Pakistan, and Burma.................................................................................................................................................... Pachycerus sellatus Faust, 1904   
 – Sides of vertex not raised above eyes. Length: 10.4–14.3 mm. Southern Morocco.........................................................................................................................................................  Pachycerus simonae sp. nov.    
8. Head with raised tubercles above eyes; space between eyes smaller than rostrum at base..............................9  
 – Head smooth, lacking tubercles above eyes; space between eyes larger than rostrum at base. Length: 11.5 mm. Southern India................................................................................................................................................................................................................................................  Pachycerus barclayi sp. nov.    
 9. Apex of aedeagus subtruncate, lamella oval (Fig. 28); cornu of spermatheca not acuminate; hemisternites broad (Fig. 18); sides of pronotum converging forwards, dorsolateral impressions sharp, granules low, scarcely convex; length/width of elytra> 1.5. Length: 10.7–13.9 mm. Senegal, Mauritania, southern Morocco................................................................................................................................... Pachycerus opimus (Gyllenhal, 1834)   
 – Apex of aedeagus acute, lamella triangular (Fig. 27); cornu of spermatheca narrowed at apex; hemisternites S-shaped, narrow (Fig. 19); sides of pronotum parallel, dorsolateral impressions shallow; granules distinctly convex; length/width of elytra, 1.4. Length: 12.2–12.4 mm. Saudi Arabia, Egypt, and Sudan............................................................................................................................................  Pachycerus hippali sp. nov.
description: Published as part of Meregalli, Massimo, 2009, Revision of the Indo-African Pachycerus Schoenherr, 1823, with a description of four new species (Coleoptera: Curculionidae: Lixinae), pp. 295-325 in Zoological Journal of the Linnean Society 157 (2) on page 298, DOI: 10.1111/j.1096-3642.2008.00506.x, http://zenodo.org/record/5443527