Spiriferida


Also found in: Wikipedia.

Spiriferida

[‚spī·rə′fer·əd·ə]
(paleontology)
An order of fossil articulate brachiopods distinguished by the spiralium, a pair of spirally coiled ribbons of calcite supported by the crura.

Spiriferida

 

an extinct order of invertebrates of the class Tes-ticardines of the phylum Brachiopoda. Spiriferida existed from the Ordovician to the Middle Jurassic. The shell had convex ventral and dorsal valves and was elongated mainly laterally, with well-developed areas along the posterior margin, or hinge line. The skeleton supported arms and consisted of two conical spiralia whose apexes were directed laterally. Spiriferida were benthic organisms, which attached themselves to a substrate by means of outgrowths, or stalks, that emerged through a special opening in the shell. Spiriferida are valuable in determining the stratigraphy of Paleozoic deposits.

REFERENCES

Osnovy paleóntologa. Mshanki, brakhiopody. Moscow, 1960.
References in periodicals archive ?
Field study led to 27 species from 13 genera being examined, thereby revealsing that brachiopods havingglarge shells, belonging to the Productidae and Spiriferida families, likePermian- Sphaeroidothyris, Araxilevis and Orthotetina, were more frequent and the shells were bigger in the lower and middle parts of the sequence being studied.
Two identifiable orders of Brachiopoda are present: Spiriferida and Rhynchonellida.