Antiquatonia

Antiquatonia is an extinct genus of brachiopod belonging to the order Productida and family Productidae. Specimens have been found in Carboniferous beds across many continents, suggesting the genus had a cosmopolitan distribution.^[1] Species level taxonomy of Antiquatonia is in need of revision.^[2]

Antiquatonia Temporal range: Visean–Serpukhovian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil from the Boggs Shale
Scientific classification
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	†Strophomenata
Order:	†Productida
Family:	†Productidae
Tribe:	†Retariini
Genus:	†Antiquatonia Miloradovich, 1945
Species
List A. blackwelderi (Gordon) A. coloradoensis (Girty) A. cooperi (Shi, 1990) A. costata (Sowerby, 1827) A. inflativentra (Cooper & Grant, 1975) A. insculpta (Muir-Wood, 1930) A. jemezensis (Harlow & Sutherland) A. pernodosa (Easton, 1962) A. portlockianus (Norwood & Pratten, 1855) A. posthindi (Solomina, 1970) A. reticulata (Cooper, 1957)

Description

Like other members of Productinae, Antiquatonia had a deep corpus cavity, a geniculate profile with long trails, and well-developed marginal structures such as ear baffles. This genus had thick, halteroid ventral spines. The ears were flanked by a ridge of ventral spines, with complimentary internal lateral ridges.^[1]

Classification

Muir-Wood & Cooper (1960) placed Antiquatonia in the subfamily Dictyoclostinae, though later analyses would find it to belong in Productinae instead. Leighton & Maples (2002) conducted multiple phylogenetic analyses which are strongly in agreement that Antiquatonia forms a clade with Diaphragmus and Spinocarinifera. The results of their phylogenetic analyses are displayed in the cladogram below:^[2]

	Productella
	Praewaagenoconcha Sentosia Leioproductus Spinocarinifera Diaphragmus Antiquatonia Flexaria Buxtonia Pustula Echinoconchus Echinaria Pulchratia Parajuresania