Rostral plate

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Underside of the cephalon

The rostral plate (also epistoma or rostrum ( lat . "Beak")) is a median plate on the underside of the cephalon (head shield) of the extinct trilobites (Trilobita).

In the trilobite family of the Olenellidae, the rostral plate can be delimited in front and on the side by the perrostral suture (a seam running approximately from one cheek to the other) or it can partially lie on the top of the head.

In some of the species, the hypostome , which probably belonged to the oral apparatus, is attached to the rostral plate ( conterminant position of the hypostome). In the other species, the hypostome is not directly attached ( naturally "floating").

See also : Rostrum

Individual evidence

  1. ^ Ulrich Lehmann: Paleontological Dictionary . 4th edition. Enke Verlag , Stuttgart, 1996 p. 206. ISBN 3-432-83574-4 .
  2. ^ Ulrich Lehmann: Paleontological Dictionary . 4th edition. Enke Verlag, Stuttgart, 1996 p. 177.

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