Definition of Proostracum. Meaning of Proostracum. Synonyms of Proostracum

Here you will find one or more explanations in English for the word Proostracum. Also in the bottom left of the page several parts of wikipedia pages related to the word Proostracum and, of course, Proostracum synonyms and on the right images related to the word Proostracum.

Definition of Proostracum

Proostracum
Proostracum Pro*["o]s"tra*cum, n.; pl. Pro["o]straca. [NL., fr. Gr. ? before + ? shell of a testacean.] (Zo["o]l.) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.

Meaning of Proostracum from wikipedia

- been discussed by modern researchers, as it lacked a broad three-lobed proostra**** (The anterior prolongation of the guard of the phragmocone), the autapomorphy...
- bullet-shaped rostrum of true belemnites, a short forward projecting proostra****, and ten hook bearing arms of equal length. Belemnotheutis fossils are...
- the animal, and which may have been broadly oval or rhombohedral. The proostra**** in front is flat, of considerable width and not likely to have been covered...
- became ****ed while the outer (dorsal) lip grows into a gladius-like proostra**** (B.R.&S). Once started, the "gladius" grew rapidly. At a phragmocone...