Megalopinus punctatus
Creators: name: Puthz, V.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Megalopinus
Megalopinus punctatus

description: Key to the species of mixed group 3 ("- frons -complex") of the punctatus -group)
Most of the species can be only identified by the male sexual characters.
1 Elytra with a large reddish yellow area (fig. 105).: Head (fig. 50). Small: 2,9mm. Panama ................................................................................................... bullatifrons nov.sp.
- Elytra otherwise, mostly larger species...............................................................................2
2 Elytra with a reddish yellow spot mediolaterally.: Sternite 7 with a small asymmetrical tooth apicomedially (fig. 148).......................................................................3
- Elytra otherwise.: posterior margin of sternite 7 simple.................................................4
3: E (as in fig. 388). 3.9-4.2mm (FB 2.4mm) Panama ............................... miriceps nov.sp.
-: E (fig. 270). 4.1mm (FB 2.4mm) Panama ....................................... stupendiceps nov.sp.
4 Frons, at least on posterior portion, finely and densely punctate........................................5
- Frons otherwise...................................................................................................................6
5 Frons with a narrow median carina posteromedially (fig. 43).: E (fig. 52, PUTHZ 1994a). 3.5mm. Brazil ................................................................. brasiliensis (BERNHAUER)
- Frons with a ± deep impression posteromedially (fig. 56).: E (fig. 234). 3.0-3.9mm. Ecuador ............................................................................................... punctulifrons nov.sp.
6 Each elytron with two reddish yellow spots.: Frons completely matt with a small elevated knot medially, E (fig. 255). 3,3mm. Brazil ............................... opacifrons nov.sp.
- Elytra otherwise..................................................................................................................7
7 Elytra completely dark, darkbrown or black.......................................................................8
- Elytra each with one ± large reddish yellow spot..............................................................10
8: Frons with elevated teeth...............................................................................................9
-: Frons:: Frons with two small, deep impressions posteromedially (fig. 42). 2.6- 3.2mm. West Indies: Grenada .............................................................. bicavatifrons PUTHZ
9: Frons with four teeth(fig. 45), E (fig. 245). 3.2mm. Nicaragua ..... cornuatifrons nov.sp.
-: Frons with two lateral teeth and one median ridge (fig. 52), E (fig. 253). 3.1mm. Costa Rica ................................................................................................. mirifrons nov.sp.
10 Most of the elytra reddish yellow.......................................................................................11
- Most of the elytra blackish, each elytron with a reddish yellow spot posteromedially (figs 100-102, 104)............................................................................................................13
11: Frons with a strong bump posteromedially (figs 51, 53).............................................12
-: Frons with a narrow carina posteromedially (fig. 48), E (fig. 241). 3.6mm. Ecuador ..... .............................................................................................................. diversifrons nov.sp.
12: Frons with longitudinal striae posteromedially, with coarse punctures near medial eye margins (fig. 51). Pronotum distinctly longer than broad. E (fig. 233). 3,8-4,2mm. Ecuador .................................................................................................. fornicifrons nov.sp.
-: Frons without longitudinal striae posteromedially (fig. 53), no punctures near medial eye margins. Pronotum about as long as broad. E (fig. 232). 3.5mm. Ecuador ......... .................................................................................................................. bullifrons nov.sp.
13: Pronotum matt in anterior half.....................................................................................14
-: Pronotum completely shiny.........................................................................................16
14: Frons with a broad excavation posteriorly, most of frons shiny (fig. x), E (fig. y). 3.8-4.8mm. Brazil ..................................................................................... v arifrons nov.sp.
-: Frons otherwise, completely matt or densely sculptured.............................................15
15: Frons with two narrow lateral impressions and a median knot, completely matt. fig. 124). 3.8-4.3mm. Brazil ......................................................................... scabrifrons nov.sp.
-: Frons densely longituidinally sculptured and coarsely punctate (fig. 49), E (fig. 252). 3.0mm. Mexico ............................................................................ crenulifrons nov.sp.
16: Frons with two lateral teeth, shiny (fig. 38), E (fig. 246). 3.7-4.5mm. ................. Brazil. ............................................................................................................... vitulifrons nov.sp.
-: Frons without lateral teeth...............................................................................................17
17: Frons completely matt.................................................................................................18
-: Frons ± shiny, smooth or longitudinally striated.........................................................21
18: Frons with a narrow median carina posteromedially, E (fig. 243). 3.8mm. Brazil .......... ....................................................................................................... carinifrons (WENDELER)
-: Frons otherwise............................................................................................................19
19: Frons with two posteromedian corns (fig. 41, 47). 3.2mm. Brazil ................................... ........................................................................................................... bubularifrons nov.sp.
-: Frons otherwise............................................................................................................18
20: Frons strongly triangularly elevated with a small smooth median knot (fig. 44), E (fig. 258). 3.3-3.9mm. Brazil ...................................................... brevipennis (BERNHAUER)
-: Frons moderately convex with a small smooth knot posteromedially (fig. 58), E (fig. 249). 3.6mm. Brazil ....................................................................... verrucifrons nov.sp.
21: Frons with a deep hollow/impression posteromedially, smooth with some punctures (fig. 46), E (fig. 244). 3.2-3.8mm. Brazil .................................................. cavifrons nov.sp.
-: Frons otherwise, with longitudinal striae.....................................................................20
22: Most of frons longitudinally striated (fig. 54), E (fig. 242). 3.8mm. Brazil ..................... ................................................................................................................ striatifrons nov.sp.
-: Frons striate only in posterior portion (fig. 37), E (fig. 248). 3.8mm. Brazil ................... ................................................................................................................. strigifrons nov.sp.
description: Published as part of Puthz, V., 2012, Über die neuweltlichen Megalopinus-Arten (Coleoptera, Staphylinidae) (24. Beitrag zur Kenntnis der Megalopsidiinen), pp. 613-834 in Linzer biologische Beiträge 44 (1) on pages 711-713, DOI: 10.5281/zenodo.5328273