Family KRAUSSINIDAE Dall, 1870

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Introduction

Occurence: Miocene to Recent.

Diagnosis

Spiculate, without dental plates and with zygolophous to plectolophous lophophores, loop in most advanced genera composed of ascending lamellae attached to low median septum and descending lamellae attached to sides of ring formed by ascending lamellae; in more primitive genera ring of ascending lamellae not completed ventrally and descending lamellae not developed at all or only incipiently. From Moore (1965: H833).

(A zygolophous lophophore consist of strait or crecentric side arms bearing two row of paired filamentar appendages; a plectolophous lophophore consist of u-shaped side arms bearing double row of paired filamentar appendages but terminating distally in medially placed plano-spire normal to commisural plane and bearing single row or paired appendages).

Diagnosis References

Moore, R.C. 1965. Treatise on Invertebrate Paleontology. Part H. Brachiopoda. New York : The Geological Society of America, Inc. and The University of Kansas Press Vol. 2 pp. H523-H927.

General References

Moore, R.C. 1965. Treatise on Invertebrate Paleontology. Part H. Brachiopoda. New York : The Geological Society of America, Inc. and The University of Kansas Press Vol. 2 pp. H523-H927.

History of changes