Semionotiformes

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. s.: Clastes… Continue reading Semionotiformes

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Categorised as Holostei

Pycnodontoidei

Belongs within: Pycnodontiformes.Contains: Pycnodontidae. The Pycnodontoidei are a clade of pycnodontiform fishes characterised by the loss of scales over much of the body (Poyato-Ariza & Wenz 2002). Characters (from Poyato-Ariza & Wenz 2002): Opercular process of hyomandibular absent; ossifications in gular region absent; two branchiostegal rays, thin and separated; crenulations on vomerine and prearticular teeth… Continue reading Pycnodontoidei

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Categorised as Holostei

Proscinetinae

Belongs within: Pycnodontidae. The Proscinetinae are a group of pycnodontid fishes known from the Late Jurassic and Early Cretaceous, characterised by the alternation of one large and two small teeth in the main vomerine tooth row (Poyato-Ariza & Wenz 2002). Characters (from Poyato-Ariza & Wenz 2002): Three vomerine tooth rows; main vomerine tooth row alternating… Continue reading Proscinetinae

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Categorised as Holostei

Holostei

Belongs within: Neopterygii.Contains: Pycnodontiformes, Semionotiformes. Gar! Published 10 November 2018 Apart from the mostly terrestrial radiation of the tetrapods, the vast majority of today’s bony-skeletoned fishes belong to the clade of the teleosts. Way back in the Triassic, the ancestors of this clade went through a process of modification of the jaw skeleton to make… Continue reading Holostei