The continental Upper Triassic Maleri and Tiki Formations of peninsular India were prospected for microverte- brate yielding-horizons
Acta Palaeontologica Polonica 55 (2): 241–264 Numerous isolated teeth fin spine fragments and dermal denticles of a hybodont shark from a lacustrine limestone
2 jui 2022 · marine chondrichthyan lineages during the Triassic and Jurassic Five isolated teeth of indeterminate upper/lower jaw position The
Elongate tooth crowns of the hybodont shark Lissodus are the most common generically identifiable vertebrate fossils re- covered from NMMNH locality 354
Hybodont shark teeth from the continental Upper Triassic deposits of India Guntupalli V R PRASAD Kulwant SINGH Varun PARMAR Anjali GOSWAMI& Charan S SUDAN Abstract The continental Upper Triassic Maleri and Tiki Formations of peninsular India were prospected for microverte-brate yielding-horizons
Hybodont sharks one of the most successful chondrichthyan lineagesappearedintheLateDevonian(Ginteretal 2002)and became extinct at the end of the Cretaceous (Becker et al 2004) The hybodonts attained a high diversity during the Triassic but their abundance started decreasing from the Jurassic onwards (Cuny et al 2007)
The five morphotypes (symphyseal mesial anterolateral lateral and posterior) previously applied to the teeth of other species of Lonchidionare applicable to L humblei which exhibits moderate heterodonty The histological structure of the teeth also changes slightly posteriorly through the dentition
Created Date: 10/7/2008 12:14:07 PM
Although known from Mesozoic marine fresh and brackish water deposits from North America Europe Africa and Asia hybodont shark remains have been rarely reported from the Cretaceous formations of Kansas Remains of hybodonts reported from outside Kansas consist of small teeth distinctive cephalic hooks dorsal fin spines and occasion-
the hybodont shark Lissodus humblei several morphotypes of actinopterygian fish including redfieldiids and semionotids fragmentary labyrinthodont amphibians and indeterminate reptiles
Isolated teeth of ?ve hybodont taxa (Hybodussp Parvodussp Lonchidion khoratensisnov sp Isanodus paladejinov gen nov sp Heteroptychodus steinmanni) are described from the freshwater Sao
The seven Meristodonoides sp teeth from the Kiowa Shale (Fig 3) are from a collection of more than 30 hybodont teeth and fragments recovered from the upper level of the Buildex Inc shale
The teeth of this shark represent a new record for the poorly known vertebrate marine paleofauna of the Kiowa The fragments were discovered in association with the teeth of another hybodont two lamniform sharks a ray and a pycnodont fish; a turtle vertebra; a plesiosaur tooth fragment; and bone osteoscute and tooth fragments of crocodilians
Two isolatedPlanohybodusteeth from the underlyingLower Kimmeridgian deposits (Cymodoce Zone) outcrop- ping around La Rochelle (Ré Island and Châtelaillon)display some damage that might be linked to the feedinghabits of this shark (Fig 2d e)