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Anaspida ("shieldless ones") is an extinct group of jawless fish that existed from the early Silurian period to the late Devonian period. [2] They were classically regarded as the ancestors of lampreys , [ 3 ] but it is denied in recent phylogenetic analysis, [ 4 ] although some analysis show these group would be at least related. [ 5 ]
Thelodonti ('feeble-teeth') are a group of small, extinct jawless fishes with distinctive scales instead of large plates of armour. There is much debate over whether the group of Palaeozoic fish known as the Thelodonti (formerly coelolepids [11]) represent a monophyletic grouping, or disparate stem groups to the major lines of jawless and jawed ...
Myllokunmingiidae is a group of very early, jawless prehistoric fish which lived during the Cambrian period. [2] The Myllokunmingiids are the earliest known group of craniates . The group contains only three known genera, Haikouichthys , Myllokunmingia , and Zhongjianichthys .
Apedolepis (meaning "flat scale", from Greek ἄπεδοςi, apedos, meaning 'even', 'flat', or 'level' and λεπίς, meaning 'scale') was an extinct genus of early jawless fish known from the Ordovician Stokes Formation of central Australia. [1] All existing material was collected in the Areyonga Creek section of the eastern Gardiner Range. [1]
Thelodonti (from Greek: "nipple teeth") [4] is a class of extinct Palaeozoic jawless fishes with distinctive scales instead of large plates of armor.. There is much debate over whether the group represents a monophyletic grouping, or disparate stem groups to the major lines of jawless and jawed fish.
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.
3D restoration. Haikouichthys is about 2.5 cm (1 in) long and is narrower than Myllokunmingia, another putative chordate that comes from the same beds. [2] The holotype of Haikouichthys ercaicunensis was found in the Yuanshan member of the Qiongzhusi Formation in the 'Eoredlichia' Zone near Ercai Village in the Haikou Subdistrict (not to be confused with the city of Haikou in Hainan) of Xishan ...
Arandaspida is a taxon of very early, jawless prehistoric fish which lived during the Ordovician period. Arandaspids represent some of the oldest known vertebrates. The group represents a subclass within the class Pteraspidomorphi, and contains only one order, the Arandaspidiformes.