Premnobius
Creators: name: Atkinson, Thomas H.
name: Flechtmann, Carlos A. H.
name: Petrov, Alexander V.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Premnobius

description: Key to American species of Premnobius (females only)
The following key will distinguish females of all species of Premnobius known from the Americas, both native and exotic.
1 Declivity with a pair of quadrate spines on lower lateral margins, their height subequal to width at base; spines on lateral margins often blunt or digitate (Fig. 4 A–H)................................................................ 2
- Declivity without pair of quadrate spines on lower margins; all granules or spines on lateral margins acutely pointed or digitate (Fig. 5 A–F)......................................................................................... 5
2 Pronotum not elongate, length 1/4 of body length; quadrate elevation near middle of declivity in lateral view (Fig. 4 A,B,E,F) ................................................................................................... 3
- Pronotum elongate, length 1/3 of body length; quadrate elevations on posterior 1/3 of declivity in lateral view (Figs. 4 C,D, G–H)............................................................................................... 4
3 Quadrate elevation thickened basally, displaced medially from posterolateral crest; prominent, acute granules at base of declivity on interstriae 2 and 4 (Fig. 4 A,B)......................................................... flechtmanni (Wood)
- Quadrate elevation not thickened, on posterolateral crest, granules at base of declivity inconspicuous (Fig. 4 E,F)............................................................................................ neoadjunctus (Schedl)
4 Acute denticle near base of declivity on interstria 3 short, displaced medially from declivital crest; length 3 mm (Fig. 4 C,D)......................................................................... perezdelacrucei Petrov & Atkinson
- Acute denticle near base of declivity on interstria 3 digitate, nearly as long as quadrate process, on declivital crest; length 2 mm Fig. 4 G,H)............................................................................. assiduus (Schedl)
5 Large digitate spine near apex of declivity, its length at least 3 its basal diameter (Fig. 5 A–B).................................................................................................... brownei Atkinson & Flechtmann
- Declivital margin without large spines near apex, either without large spines or largest spines near midpoint of declivity (Fig. 5 A–D)............................................................................................... 6
6 Interstria 1 on declivity with a row of small pointed tubercles; raised lateral margin of declivity with small pointed granules; transition from elytral disc to declivity pronounced, not gradual (Fig. 5 A,B)....................... cavipennis Eichhoff
- Interstria 1 on declivity without any granules; several large, pointed tubercles near base and midpoint of declivity on lateral margin; base of declivity extends gradually anteriorad at base along insterstria 1 (Fig. 5, C,D)....... ambitiosus (Schaufuss)
description: Published as part of Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, pp. 69-91 in Zootaxa 5249 (1) on page 73, DOI: 10.11646/zootaxa.5249.1.4, http://zenodo.org/record/7685313