The rare genus Myoplatypus (Coleoptera: Curculionidae: Platypodinae): three new species, new reports, and first records for South America Author Kirkendall, Lawrence R. 0000-0002-7335-6441 Department of Biological Sciences, University of Bergen, Postbox 7803, N- 5020 Bergen, Norway lawrence. kirkendall @ gmail. com; https: // orcid. org / 0000 - 0002 - 7335 - 6441 lawrence.kirkendall@gmail.com Author Atkinson, Thomas H. 0000-0002-9675-8507 University of Texas Insect Collection, 3001 Lake Austin Blvd., Suite 1.314, Austin, Texas 78702, U. S. A. thatkinson. austin @ gmail. com; https: // orcid. org / 0000 - 0002 - 9675 - 8507 thatkinson.austin@gmail.com text Zootaxa 2023 2023-09-27 5351 3 301 321 http://dx.doi.org/10.11646/zootaxa.5351.3.1 journal article 10.11646/zootaxa.5351.3.1 1175-5326 8391656 9CDE9F38-A41E-4295-9F26-56E3FD90F0D3 Key to males of Myoplatypus . Total body lengths used in the key are taken from Table 1 . Specimens should also be carefully compared with the photographs, bearing in mind body size. 1. Spines on ventrite 3 short (can be absent), as wide as tall; southeastern or southern USA (1 temperate species).... flavicornis - Spines on ventrite 3 longer; collected from American tropics (9 tropical species)................................... 2 2. In addition to spines on ventrite 3, spines present on ventrite 4 (can be quite low or occasionally absent in brevicornis ); mid- or upper-elevation species................................................................................. 3 - No paired spines on ventrite 4........................................................................... 4 3. Smaller, < 4 mm long; interstriae 3 not ending in a prominent tooth..................................... quadricornis - Larger,> 4.5 mm long; interstriae 3 ending in a prominent tooth........................................ brevicornis 4. Length about 2 mm ; lowland species................................................................. sicarius - Length about 3 mm or more (lowland or upland species)...................................................... 5 5. Simple declivity, partly covered in short dense setae; lowland species........................................ petrovi - Declivity with strongly developed posterolateral angles ( one sp. with only short, acute projections), never smooth with dense short setae; mid- to upper elevation species................................................................. 6 6. Declivity fairly simple, posterolateral angles forming an equilateral triangle; interstriae 1–4 carinate for at least final 1/3 of their length.................................................................................... nicaraguensis - Declivity with posterolateral angles weakly to strongly produced horizontally; interstriae 1–4 carinate for final ¼ or less of their length.............................................................................................. 7 7. Interstriae 1 ending in a long, thick spine as long as posterolateral angle projection................................. 8 - Interstriae 1 not ending in a long thick spine................................................................ 9 8. Shorter, ca 4.0 mm.............................................................................. connexus - Larger, ca 4.7 mm ................................................................................ senexus 9. Posterolateral angle produced into a horizontal long, blunt spine.......................................... biprorus - Posterolateral angle produced downwards at an angle................................................... prenexus