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- Die Acrotretida sind eine ausgestorbene Ordnung der Armfüßer aus dem Unterstamm der . (de)
- Acrotretida is an extinct order of linguliform brachiopods in the class Lingulata. They lived from the Lower Cambrian to the Middle Devonian, with their peak diversity from the Middle Cambrian to the Ordovician. Acrotretida contains the sole superfamily Acrotretoidea. Many acrotretides have a tall and conical ventral valve with a pedicle opening at the apex, while the dorsal valve was convex to a much lesser degree. Based on preserved muscle scars, the lateral muscles are shifted back and condensed into large bundles of tendons. These replace the stout, column-like central muscles, which are present in other linguliforms but apparently absent in acrotretides. The larval shell, which is retained near the pedicle opening, has a strongly pitted texture. The adult shell is smooth and has a rounded outline, and is phosphatic like other linguliforms. (en)
- Acrotretida är en ordning av armfotingar. Acrotretida ingår i klassen Inarticulata, fylumet armfotingar och riket djur. Ordningen innehåller bara familjen Craniidae. Acrotretida är enda ordningen i klassen Inarticulata. (sv)
- Acrotretida — викопний ряд плечоногих класу Лінгуляти (Lingulata). Ця група сидячих брахіопод, існувала з кембрію по девон. Їхня мушля була округлої форми. Живились за допомогою фільтрування органічних решток з води. (uk)
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- 3130 (xsd:nonNegativeInteger)
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- Diagram of Eohadrotreta zhenbaensis, a Lower Cambrian member of the family Acrotretidae (en)
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- Die Acrotretida sind eine ausgestorbene Ordnung der Armfüßer aus dem Unterstamm der . (de)
- Acrotretida är en ordning av armfotingar. Acrotretida ingår i klassen Inarticulata, fylumet armfotingar och riket djur. Ordningen innehåller bara familjen Craniidae. Acrotretida är enda ordningen i klassen Inarticulata. (sv)
- Acrotretida — викопний ряд плечоногих класу Лінгуляти (Lingulata). Ця група сидячих брахіопод, існувала з кембрію по девон. Їхня мушля була округлої форми. Живились за допомогою фільтрування органічних решток з води. (uk)
- Acrotretida is an extinct order of linguliform brachiopods in the class Lingulata. They lived from the Lower Cambrian to the Middle Devonian, with their peak diversity from the Middle Cambrian to the Ordovician. Acrotretida contains the sole superfamily Acrotretoidea. (en)
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- Acrotretida (en)
- Acrotretida (de)
- Acrotretida (sv)
- Acrotretida (uk)
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