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.
The type and only known species is Collilongus rarus.
[1] It is a rare component of the Czatkowice 1 fauna, known only from vertebrae.
Collilongus was a contemporary of the more common archosauriform Osmolskina.
This article about a Triassic reptile is a stub.