Acrotrichis fascicularis, from here.

Belongs within: Staphylinoidea.
Contains: Acrotrichinae.

The Ptiliidae, featherwing beetles, are a group of very small beetles with narrow hindwings bearing long marginal hairs, believed to be adapted for passive flotation. Hindwings are absent in the ant-associated subfamily Cephaloplectinae which also lack eyes and have a limuloid body form. Other species are divided between the subfamilies Ptiliinae, in which the elytra are usually more or less complete, and the Acrotrichinae in which they are truncate or shortened (Hall 2001).

Characters (from Dybas 1990): Antennae usually slender, 11-segmented (occasionally 10-segmented); first two segments considerably enlarged; terminal two or three segments gradually or more abruptly enlarged to form loose club. Head capsule with gular sutures absent, posterior arms of tentorium attached on or near ventral rim of capsule. Wings (when present) with membrane very narrow, borne on single sclerotised stalk or two sclerotised basal struts, furnished with very long marginal hairs. Leg tarsi with only two or (indistinctly) three segments visible. Spermatheca usually well sclerotised, with distinctive pump apparatus.

Ptiliidae [Ptilidae, Ptiliinae, Trichopterygidae]
| i. s.: Discheramocephalus brucei Grebennikov 2008B14
|--Ptiliini [Cephaloplectinae, Limulodidae, Limulodinae]H01
| | i. s.: Urotrianus Silvestri 1946H01
| | Pycnopteryx Dybas 1955H01
| | Termitopteryx Dybas 1955 [incl. Dybasina Lundgren 1983]H01
| | Xenopteryx Dybas 1961H01
| | Achosia Deane 1930H01
| | Africoptilium Johnson 1967H01
| | Astatopteryx Perris 1862H01
| | Championella Matthews 1884H01
| | Cissidium Motschulsky 1855H01
| | Cnemadoxia Deane 1930H01
| | Cochliarion Deane 1930H01
| | Dipentium Johnson 1982H01
| | Etronia Deane 1931H01
| | Euryptilium Matthews 1872H01
| | Gomyella Johnson 1985H01
| | Kimoda Johnson 1985H01
| | Kuschelidium Johnson 1982H01
| | Leaduadicus Deane 1930H01
| | Leptinla Johnson 1985H01
| | Malkinella Dybas 1960H01
| | Micridina Johnson 1969H01
| | Myrmicotrichis Motschulsky 1855H01
| | Neotrichopteryx Deane 1931H01
| | Notoptenidium Johnson 1982H01
| | Ptenidotonium Johnson 1982H01
| | Pterycodes Matthews 1884H01
| | Rioneta Johnson 1975H01
| | Skidmorella Johnson 1971H01
| | Oligella Motschulsky 1868H01
| | Ptiliola Haldeman 1849 [incl. Nanoptilium Flach 1889]H01
| | Microptilium Matthews 1872H01
| | `--M. geistautsiH01
| | Ptiliodes Matthews 1882H01
| | `--P. austerus Johnson 1982E02
| | Actidium Matthews 1869 (see below for synonymy)H01
| | `--A. lineare Matthews 1874E02
| | Actinopteryx Matthews 1872H01
| | `--A. fucicolaD90
| | Micridium Motschulsky 1869 [incl. Dilinium Casey 1924, Dilineum (l. c.)]H01
| | `--M. lineatum LeConte 1863H01
| | Millidium Motschulsky 1855H01
| | `--M. minutissimumD90
| | Ptinellodes Matthews 1872H01
| | |--P. leconteiD90
| | `--P. suteriD90
| | Bambara Vuillet 1911 [incl. Eurygyne Dybas 1966]H01
| | |--B. fuscaD90
| | `--B. testacea [incl. B. lutea]D90
| | Eulimulodes Mann 1926H01
| | Paralimulodes Bruch 1919H01
| | `--P. wasmanniH01
| | Rodwayia Lea 1907H01
| | |--R. intercoxalis Lea 1919L19
| | |--R. minutaL19
| | |--R. orientalisLB91
| | `--R. ovataL19
| |--+--Nossidium Erichson 1845LC20, H01
| | `--Motschulskium Matthews 1872LC20, H01
| | `--M. sinuatocolle Matthews 1872H01
| `--+--Ptiliolum Flach 1888LC20, H01 (see below for synonymy)
| | `--‘Nephanes’ rugulodorsusD90
| `--+--+--Ptilium Erichson 1845LC20, H01 (see below for synonymy)
| | | |--P. horioniLC20
| | | `--P. tertiariumH01
| | `--Cephaloplectus Sharp 1883LC20, H01
| | `--C. mus (Mann 1926)B14
| `--+--+--Limulodes Matthews 1866LC20, H01 (see below for synonymy)
| | | `--L. parkiLC20
| | `--+--Pteryx Matthews 1859LC20, H01 [incl. Aderces Thomson 1858H01]
| | | `--P. suturalisLC20
| | `--AcrotrichinaeLC20
| `--+--Ptinella Motschulsky 1872LC20, H01 (see below for synonymy)
| | |--P. cavelliE02
| | |--P. errabundaLC20
| | |--P. mekuraD90
| | |--P. oligocoenicaH01
| | `--P. tayloriE02
| `--Ptenidium Erichson 1845LC20, H01 (see below for synonymy)
| |--P. corpulentum Allivert 1849E12
| |--P. evenescensH01
| |--P. laevigatumS55
| `--P. ponteleccianum zur Strassen 1955S55
`--Nanosellini [Nanosellinae]H01
|--Baranowskiella Sorensson 1997H01
|--Fijisella Hall 1999H01
|--Fijiselloides Hall 1999H01
|--Garicaphila Hall 1999H01
|--Isolumpia Deane 1931H01
|--Limulosella Hall 1999H01
|--Mikado Matthews 1889H01
|--Nellosana Johnson 1982H01
|--Nellosanoides Hall 1999H01
|--Nepalumpia Hall 1999H01
|--Paratuposa Deane 1931H01
|--Phililumpia Hall 1999H01
|--Scydosella Hall 1999H01
|--Scydoselloides Hall 1999H01
|--Tasmangarica Hall 1999H01
|--Throscidium Matthews 1872H01
|--Throscosana Hall 1999H01
|--Vitusella Hall 1999H01
|--Nanosella Motschulsky 1868 [incl. Mycophagus Friedenreich 1883]H01
| `--N. fungi (LeConte 1863) [=Ptilium fungi]H01
|--Suterina Dybas 1980 (see below for synonymy)H01
| `--S. microcephala (Dybas 1961)H01
|--Throscoptilium Barber 1924H01
| `--T. duryi Barber 1924H01
|--Cylindrosella Barber 1924H01
| `--C. dampfi Barber 1924H01
|--Hydnosella Dybas 1961H01
| `--H. globitheca Dybas 1961H01
|--Porophila Dybas 1956H01
| `--P. malkini Dybas 1956H01
|--Cylindroselloides Hall 1999H01
| `--C. dybasi Hall 1999H01
`--Throscoptilioides Hall 1999H01
`--T. norcoensis Hall 1999H01

Actidium Matthews 1869 non Fr. 1815 (ICBN) [incl. Acteella Motschulsky 1868, Actella (l. c.), Ptenidula Deane 1932]H01

Limulodes Matthews 1866LC20, H01 [incl. Carinolimulodes Seevers & Dybas 1943H01, Cephaloplectodes Seevers & Dybas 1943H01, Ecitolimulodes Seevers & Dybas 1943H01, Ecitoxenus Wasmann 1900H01, Idiolimulodes Seevers & Dybas 1943H01, Neolimulodes Seevers & Dybas 1943H01]

Ptenidium Erichson 1845LC20, H01 [incl. Anisarthria Stephens 1830H01, Epoptia Deane 1930H01, Gillmeisterium Flach 1889H01, Gressnerium Ganglbauer 1899H01, Matthewsium Flach 1889H01, Wankowizium Flach 1889H01]

Ptiliolum Flach 1888LC20, H01 [incl. Euptilium Flach 1889H01, Trichoptilium Flach 1889H01, Typhloptilium Flach 1889H01]

Ptilium Erichson 1845LC20, H01 [incl. Epitomella Motschulsky 1868H01, Micrella Motschulsky 1868H01, Micrus Motschulsky 1848H01]

Ptinella Motschulsky 1872LC20, H01 [incl. Leaptiliodes Deane 1932H01, Neuglenes Thomson 1859H01, Plitium Besuchet 1971H01, Ptiliodina Casey 1924H01]

Suterina Dybas 1980 [incl. Suterella Dybas 1961 nec Suterella Iredale 1915 nec Carmichaelia subg. Suterella Simpson 1945 (ICBN)]H01

*Type species of generic name indicated


[B14] Bouchard, P. (ed.) 2014. The Book of Beetles: A lifesize guide to six hundred of nature’s gems. Ivy Press: Lewes (United Kingdom).

[D90] Dybas, H. S. 1990. Insecta: Coleoptera Ptiliidae. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 1093–1112. John Wiley & Sones: New York.

[E02] Emberson, R. M. 2002. The beetle (Coleoptera) fauna of the Chatham Islands: additions and corrections. New Zealand Entomologist 25: 69–77.

[E12] Evenhuis, N. L. 2012. Publication and dating of the Exploration Scientifique de l’Algérie: Histoire Naturelle des Animaux Articulés (1846–1849) by Pierre Hippolyte Lucas. Zootaxa 3448: 1–61.

[H01] Hall, W. E. 2001. Ptiliidae Erichson, 1845. In: Arnett, R. H., Jr & M. C. Thomas (eds) American Beetles vol. 1. Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia pp. 233–246. CRC Press: Boca Raton.

[LB91] Lawrence, J. F., & E. B. Britton. 1991. Coleoptera (beetles). In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 2 pp. 543–683. Melbourne University Press: Carlton (Victoria).

[L19] Lea, A. M. 1919. Notes on some miscellaneous Coleoptera with descriptions of new species.—Part V. Transactions of the Royal Society of South Australia 43: 166–261, pls 25–27.

[LC20] Lü, L., C.-Y. Cai, X. Zhang, A. F. Newton, M. K. Thayer & H.-Z. Zhou. 2020. Linking evolutionary mode to palaeoclimate change reveals rapid radiations of staphylinoid beetles in low-energy conditions. Current Zoology 66 (4): 435–444.

[S55] Strassen, R. zur. 1955. Eine neue Ptiliide aus Korsika (Ins., Col.) Senckenbergiana Biologica 36: 215–218.

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