Orthacea

[ȯr′thās·ē·ə]

(paleontology)

An extinct group of articulate brachiopods in the suborder Orthidina in which the delthyrium is open.

References in periodicals archive ?

Nekotorye predstaviteli nadsemejstva Orthacea iz verkhnego ordovika Estonii [Some representatives of the subfamily Orthacea in the Upper Ordovician of Estonia].

Revision of the concept of the orthide brachiopod Cyrtonotella in the Middle Ordovician of the East Baltic/Baltikumi Kesk-Ordoviitsiumi ortiidse brahhiopoodi Cyrtonotella kontseptsiooni revisjon

Einige Vertreter der Superfamilie Orthacea des oberordoviziums Estland.

New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia)/Hirnantia uued ortiidsed brahhiopoodid Porkuni lademe tuuplabiloikest (Porkuni murd Kirde-Eestis)

Some representatives of the superfamily Orthacea from the upper Ordovician of Estonia.

Platystrophia (Orthida) and new related Ordovician and early Silurian brachiopod genera/Platystrophia (Orthida) ja uued sugulaslikud Ordoviitsiumi ja Vara-Siluri kasijalgsete perekonnad

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