The Teleost Fuse

A while back, I discussed the group of fish known as the Holostei, the gars and bowfin. The Holostei constitute one branch of the clade Neopterygii which includes the majority of living ray-finned fishes. However, their success in the modern environment pales in comparison to that of their sister group, the Teleostei. Siemensichthys macrocephalus, an… Continue reading The Teleost Fuse

Actinopteri

Reconstruction of Birgeria, copyright DiBgd.Belongs within: Actinopterygii. Contains: Neopterygii, Palaeonisciformes, Acipenseriformes. The Actinopteri are a clade of fishes including all modern ray-finned fishes with the exception of the bichirs of the Polypteridae. Members of this clade have the premaxilla confined to a region anterior to the orbit, parasphenoid teeth absent, and proximal radials of the… Continue reading Actinopteri

Semionotiformes

Lepidotes elvensis, copyright Ghedoghedo.Belongs within: Holostei. The Semionotiformes are a group of fishes including the modern gars and their fossil relatives, united by the absence of the intercalar and gular bones, the presence of a series of antorbitals anterior to the circum-orbital ring, and enlarged basal and fringing fulcra (Cavin 2010). <==Semionotiformes [Ginglymodi, Semionotoidei] |  i.… Continue reading Semionotiformes

Teleostei

Belongs within: Neopterygii.Contains: Pachycormidae, Elopomorpha, Osteoglossocephalai. The Teleostei are a clade including the majority of living ray-finned fishes. Teleosts are characterised by the presence of one or more uroneurals, modifications of the vertebral neural arches that support the caudal fin. Early members include the Mesozoic Pholidophoriformes, small fishes up to forty centimetres long that retain… Continue reading Teleostei