{{Short description|Family of trilobites}} {{Automatic taxobox | image = Illaenus sarsi lateral.jpg | image_caption = ''Illaenus sarsi'', 25mm | fossil_range = {{fossil range|Ordovician|Silurian}}<ref name=fa>{{Cite web |url=https://www.fossilworks.org |title=The Paleobiology Database |access-date=2021-12-17 |archive-date=2022-03-25 |archive-url=https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home |url-status=live }}</ref> | taxon = Illaenidae | authority = Hawle and Corda, 1847 }}
The '''Illaenidae''' are a family of trilobites in the order Corynexochida. 223 currently accepted species in 24 genera are known from the Ordovician. Some scholars include the Panderiidae in the Illaenidae, but this is not generally supported.<ref name="HarperServais">{{cite book|title= Early Palaeozoic Biogeography and Palaeogeography|series= Memoirs of the Geological Society of London|volume= 38|editor1= D.A.T. Harper|editor1-link= D.A.T. Harper|editor2=T. Servais|publisher= Geological Society of London|year= 2014|isbn= 978-1862393738|pages= 490}}</ref>
== Distribution == ''Illaenus? priscus'' from Salair and ''Illaenus? berkutensis'' from the Malyi Karatau, Kazakhstan (both Lower Tremadocian), are both very poorly known and it remains uncertain to which family they could best be assigned. The first certain Illaenid is ''I. hinomotoensis'' from the Upper Tremadocian of North China and South Korea. The earliest species known from Laurentia (western Ireland) is ''I. weaveri'', probably latest Floian. These early occurrences are from the tropics, but during the Darriwilian the family spread over southern Gondwana, and became cosmopolitan for the remainder of the Ordovician, although most genera had limited distributions. The genus ''Stenopareia'' survived the Ordovician–Silurian extinction events and the family slightly rebounded with 26 species divided over three genera during the Silurian. ''Quadratillaenus tewoensis'' from North China is the youngest species known (Pridoli Epoch).<ref name="HarperServais" />
==Genera== *''Bumastoides'' Whittington 1954 *''Cryptonymus'' Eichwald 1825 *''Deucalion'' Shtsheglov 1827 *''Dysplanus'' Burmeister 1843 *''Ectillaenus'' Salter 1867 *''Harpillaenus'' Whittington 1963 *''Hyboaspis'' Raymond 1920 *''Hydrolaenus'' Salter 1867 *''Illaenus'' Dalman 1827 *''Nanillaenus'' Jaanusson 1954 *''Octillaenus'' Salter 1867 *''Parillaenus'' Jaanusson 1954 *''Platillaenus'' Jaanusson 1954 *''Ptilillaenus'' Lu 1962 *''Rhodope'' Angelin 1854 *''Stenopareia'' Holm 1886 *''Thaleops'' Conrad 1843 *''Ulugtella'' Petrunina 1975 *''Zbirovia'' Snajdr 1956 *''Zdicella'' Snajdr 1956 *''Zetillaenus'' Snajdr 1957 <ref name=fa/>
== References == {{Reflist}}
{{Taxonbar|from=Q18351058}}
Category:Ordovician trilobites Category:Illaenina Category:Trilobite families
{{Corynexochida-stub}}