Gyracanthidae

{{Short description|Extinct family of acanthodian}}

{{Automatic taxobox

| fossil_range = {{fossilrange|419.2|307.0}} Lochkovian - Moscovian

| image = Gyracanthus NT small.jpg

| image_caption = Reconstruction of Gyracanthus

| taxon = Gyracanthidae

| authority = Woodward, 1906

| subdivision_ranks = Genera

| subdivision =

• {{extinct}}Gyracanthides
• {{extinct}}Gyracanthus

}}

Gyracanthidae is a family of extinct fish belonging to the class Acanthodii, known from early Devonian to late Carboniferous. Members are characterized by large, broad-based, paired fin spines with the pectoral fin spines having a distinct longitudinal curvature.{{Cite journal |last1=Warren |first1=Anne |last2=Currie |first2=Bryan P. |last3=Burrow |first3=Carole |last4=Turner |first4=Susan |date=2000-06-27 |title=A redescription and reinterpretation of Gyracanthides murrayi Woodward 1906 (Acanthodii, Gyracanthidae) from the Lower Carboniferous of the Mansfield Basin, Victoria, Australia |url=https://doi.org/10.1671/0272-4634(2000)020[0225:ARAROG]2.0.CO;2 |journal=Journal of Vertebrate Paleontology |volume=20 |issue=2 |pages=225–242 |doi=10.1671/0272-4634(2000)020[0225:ARAROG]2.0.CO;2 |s2cid=130940413 |issn=0272-4634}} Although it was originally classified in order Climatiiformes, later research questioned this.{{Cite journal |last1=Turner |first1=Susan |last2=Burrow |first2=Carole J. |last3=Warren |first3=Anne |title=Gyracanthides hawkinsi sp. nov. (Acanthodii, Gyracanthidae) from the Lower Carboniferous of Queensland, Australia, with a Review of Gyracanthid Taxa |date=2005 |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2005.00479.x |journal=Palaeontology |language=en |volume=48 |issue=5 |pages=963–1006 |doi=10.1111/j.1475-4983.2005.00479.x |s2cid=84735724 |issn=0031-0239|doi-access=free }}