Collilongus

{{Short description|Extinct genus of reptiles}}

{{Italic title}}

{{Taxobox

| name = Collilongus

| fossil_range = {{fossil range|Olenekian|Olenekian|Early Triassic (Olenekian)}}

| regnum = Animalia

| phylum = Chordata

| classis = Sauropsida

| subclassis = Diapsida

| infraclassis = Archosauromorpha

| unranked_ordo = Archosauriformes

| ordo = ? Rauisuchia

| genus = Collilongus

| genus_authority = Borsuk−Białynicka & Sennikov, 2009

| subdivision_ranks = Species

| subdivision =

C. rarus Borsuk−Białynicka & Sennikov, 2009 (type)

}}

Collilongus (meaning "long neck") is an extinct genus of small archosauriform, possibly a rauisuchian, known from Early Triassic (Olenekian age) rocks of Czatkowice 1, Poland.{{Cite journal|author=Magdalena Borsuk−Białynicka; and Andriej G. Sennikov|year=2009|title=Archosauriform postcranial remains from the Early Triassic karst deposits of southern Poland|journal=Paleontologica Polonica|volume=65|pages=283–328|url=http://palaeontologia.pan.pl/PP65/PP65_283-328.pdf|access-date=2010-08-13|archive-date=2020-11-06|archive-url=https://web.archive.org/web/20201106110535/http://palaeontologia.pan.pl/PP65/PP65_283-328.pdf|url-status=dead}} It was first named by Magdalena Borsuk−Białynicka; and Andriej G. Sennikov in 2009. The type and only known species is Collilongus rarus. It is a rare component of the Czatkowice 1 fauna, known only from vertebrae. Collilongus was a contemporary of the more common archosauriform Osmolskina.