Megalopinus

Megalopinus is the only genus in the subfamily Megalopsidiinae of the Staphylinidae.^[3] Species in this genus have large eyes, antennae with distinct di- or trisegmented clubs. The tarsal formula is 5-5-5. They have unique elongated processes at the anterior margin of the labrum. They are found in decaying trees and fungus-infested logs.^[4] Four species are found in North America: Megalopinus caelatus (Gravenhorst, 1802), Megalopinus punctatus (Erichson, 1840), Megalopinus rufipes (LeConte, 1863) and Megalopinus lingafelteri Mainda, 2023.

Megalopinus
Megalopinus caelatus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Staphyliniformia
Family:	Staphylinidae
Subfamily:	Megalopsidiinae Leng, 1920
Genus:	Megalopinus Eichelbaum, 1915
Synonyms[1][2]
Genus synonymy Aulacotrachelus Benick, L., 1920 Megalopsidia Leng, 1918 Megalops Erichson, 1839 Megalops Dejean, 1833 Subfamily synonymy Megalopininae Naomi, 1986 Megalopininae Puthz, 1967 Stylopodinae Blackwelder, 1943 Aulacotrachelinae Benick, L., 1921 Megalopsinae Cameron, 1921 Megalopini Erichson, 1839

So far, more than 430 species are known from the entire New World.^[1][5] From the Orientalis 74 (+ one fossil, Megalopinus extinctus Yamamoto & Solodovnikov, 2016, described from Burmese amber^[6]) species are known.^[7]

• 
  Megalopinus caelatus
• 
  M. caelatus