Angustidontidae

Angustidontidae is an extinct family of eucarid crustaceans and the sole representatives of the order Angustidontida. They were predators ranging in size from about 4 to 9 cm (1.6 to 3.5 in) in length and lived during the Late Devonian and Early Carboniferous periods.^[1]

Angustidontidae Temporal range: Frasnian-Early Carboniferous, 380–340 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Reconstruction of Angustidontus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	†Angustidontida Gueriau, Charbonnier & Clément, 2014
Family:	†Angustidontidae Cooper, 1936
Genera
†Angustidontus †Schramidontus

They were some of the earliest Eucarids to develop maxillipeds, modified from the first or second thoracopods.^[1] They were originally considered eurypterids, but later their possible relationship with decapods was established.^[1][2]