A review of the Neotropical genus Diochus Erichson, 1840 (Coleoptera: Staphylinidae: Staphylininae)
Authors: Irmler Ulrich 
Published: December 2020

The Neotropical species of the genus Diochus are reviewed. Two species are synonymised: D. flavicans Sharp, 1876 = D. vicinus Sharp, 1876 and D. vilis Sharp, 1885 = D. schaumii Kraatz, 1860. Six species groups are differentiated containing the following species: D. longicornis-group with the species D. adisi spec. nov., D. ashei spec. nov., D. guianensis spec. nov., D. longicornis Sharp, 1876, D. tarsalis Sharp, 1876, and D. unicolor spec. nov.; D. inornatusgroup with the species D. antennalis Cameron, 1922, D. amazonensis spec. nov., D. hanagarthi spec. nov., D. hermani spec. nov., D. hibbsi spec. nov., D. inornatus Sharp, 1885, D. newtoni spec. nov., D. novus spec. nov., D. plaumanni spec. nov., D. schuelkei spec. nov., D. tricolor spec. nov., and D. vicinus Sharp, 1876; D. maculicollis-group with the species: D. brooksi spec. nov., D. ecuadoriensis spec. nov., D. maculicollis Fauvel, 1891, D. mexicanus spec. nov., D. panamaensis spec. nov., D. peruvianus spec. nov., and D. pumilio Bernhauer, 1929; D. schaumii-group with the species D. angustiformis spec. nov., D. argentinus spec. nov., D. brunneus spec. nov., D. curtipennis spec. nov., and D. schaumii Kraatz, 1860; D. verhaaghi-group with the two species D. verhaaghi spec. nov. and D. santacatarinae spec. nov.; D. nanus-group with the species D. apicipennis Cameron, 1922, D. nanus Erichson, 1839, D. parvulus Kraatz, 1860, and D. perplexus Cameron, 1922. D. formicetorum Bernhauer, 1927 is with unclear position among the named groups. A key to the species groups and to species is provided. The relation among groups, the ecology, and the geographic distribution is discussed.
Nomenclatural Acts
Diochus adisi spec. nov. – urn:lsid:zoobank.org:act:33DAA72A-B7E0-4806-BD59-8FC17FE1EF58
Diochus amazonensis spec. nov. – urn:lsid:zoobank.org:act:D2230764-A93A-46CF-B5F0-F4E6963E26DF
Diochus angustiformis spec. nov. – urn:lsid:zoobank.org:act:BB731197-AF1B-458F-AE6B-BC32865D30C9

Diochus argentinae spec. nov. – urn:lsid:zoobank.org:act:2353FF33-7AEB-4B05-A9C8-EF6CCCC95684
Diochus ashei spec. nov. – urn:lsid:zoobank.org:act:949EFF27-4323-46C9-8F5D-F4731958CA14
Diochus brooksi spec. nov. – urn:lsid:zoobank.org:act:E45E737C-D6F4-45D2-AD3A-712C3578AE37
Diochus brunneus spec. nov. – urn:lsid:zoobank.org:act:7B393143-5E9A-4DE2-92D7-4458FAEF5B2B
Diochus curtipennis spec. nov. – urn:lsid:zoobank.org:act:9F36420A-6AD4-4940-AAB0-A0535101A319
Diochus ecuadoriensis spec. nov. – urn:lsid:zoobank.org:act:0B0B68AB-0348-412D-A77B-EA722A5130C9
Diochus guianensis spec. nov. – urn:lsid:zoobank.org:act:BDD3E1B7-96A0-4ACE-BC32-4D24ADA1D2DB
Diochus hanagarthi spec. nov. – urn:lsid:zoobank.org:act:00554886-6F3A-4FBA-9639-39AF0EE7E01B
Diochus hermani spec. nov. – urn:lsid:zoobank.org:act:5C2FD0E5-BAFB-4AC4-8E80-9199884948B0
Diochus hibbsi spec. nov. – urn:lsid:zoobank.org:act:FA01A055-A996-4C60-9FE8-6756FDFA9A36
Diochus mexicanus spec. nov. – urn:lsid:zoobank.org:act:10213825-70EC-4B7F-BE1A-4FFD11B5D988
Diochus newtoni spec. nov. – urn:lsid:zoobank.org:act:FD5C80C7-1C1E-4C8C-9D48-8FEC23D9365F
Diochus novus spec. nov. – urn:lsid:zoobank.org:act:3B902DCA-F381-4754-B88C-5825BC6E0B94
Diochus panamaensis spec. nov. – urn:lsid:zoobank.org:act:989703D5-6335-4E97-8772-B999831203C3
Diochus peruvianus spec. nov. – urn:lsid:zoobank.org:act:A3ED9480-CAC6-459D-9046-D1FE793F01EC
Diochus plaumanni spec. nov. – urn:lsid:zoobank.org:act:4169DC68-8683-4290-A14A-62492505A4CA
Diochus santacatarinae spec. nov. – urn:lsid:zoobank.org:act:99209529-EE6A-43A3-BE1F-413C5DF5CA1C
Diochus schuelkei spec. nov. – urn:lsid:zoobank.org:act:4551D562-B65C-42EB-A4C5-5AA6F195F8D5
Diochus tricolor spec. nov. – urn:lsid:zoobank.org:act:5A551701-6B51-4659-B6A6-D2CBF83EA095
Diochus unicolor spec. nov. – urn:lsid:zoobank.org:act:5D7AB086-BCE1-4FEF-A732-1E210D4B3A87
Diochus verhaaghi spec. nov. – urn:lsid:zoobank.org:act:BBD1EC47-8638-4417-AE87-AC006B318FE1