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Showing results for tags 'lagynocystis'.
Lagynocystis pyramidalis was ﬁrst described and ﬁgured by Barrande 1887 under the name Anomalocystites pyramidalis. Taxonomy from Parsley, 2000. Lagynocystis pyramidalis (Barrande) from the marine Lower Ordovician of Bohemia, has features which suggest that it is ancestral, or nearly so, to living cephalochordates such as amphioxus (Branchiostoma). Diagnosis from Parsley 2000, p. 258: "Ankyroid with asymmetrical theca. M‘l—M'5 well developed: MI—M3 shortened and reduced in size: M4 and M5 absent; large CS plate. M‘5 protuberant, hollow. Sutures with M’4 and in some specimens nar