Isomer (Greek isos = "equal", méros = "part") is an element of transverse body articulation of the bilateral fossil animals of the phylum Proarticulata from the Ediacaran (Vendian) period. This term has been proposed by Andrey Yu. Ivantsov, a...
Proarticulata is a phylum of extinct, near-bilaterally symmetrical animals known from fossils found mainly in the Ediacaran (Vendian) marine deposits, with some few possible related specimen found through Cambrian until late Devonian, and dates to...
Dickinsonia is a genus of extinct organism that lived during the late Ediacaran period in what is now Australia, China, Russia, Canada and Ukraine. It had a round, approximately bilaterally symmetric body with multiple segments running along it. It...
Yorgia waggoneri is a discoid Ediacaran organism. It has a low, segmented body consisting of a short wide "head", no appendages, and a long body region, reaching a maximum length of 25 cm (9.8 in). It is classified within the extinct animal phylum...
Yorgiidae is an extinct family of the class Cephalozoa, which is a part of the wider phylum Proarticulata. They were around from around 571 to 551 Ma, and are most notable for their distinctive 'head' region, with an equally distinctive hook-like...
Sprigginidae is an extinct family of the class Cephalozoa, characterized by having a greater number of isomers than its sister taxon, Yorgiidae. They lived approximately 635 million years ago, in the Ediacaran period.
Archaeaspinus fedonkini is an extinct proarticulate from the Late Ediacaran period.
Vendia is an extinct vendiamorph from the late Ediacaran, estimated to be around 567 - 550 Ma years old, it contains two species, V. sokolovi and V. rachiata, both of which are restricted to the Ust' Pinega Formation in Northwestern Russia.
Cephalonega stepanovi is a fossil organism from Ediacaran deposits of the Arkhangelsk Region, Russia. It was described by Mikhail A. Fedonkin in 1976.
Vendiamorpha is a class of extinct animals within the Ediacaran phylum Proarticulata. The typical vendiamorph had an oval-shaped or round-shaped body divided completely into segmented isomers, that were arranged alternately in two rows with...
