1. Andrej Gajić, Sharklab - Research and protection of the cartilaginous fish , Malta
2. Adla Kahrić, Sharklab - Research and protection of the cartilaginous fish , Malta
†Cretolamna is extinct genus of selachians that lived during the Cretaceous and Paleogene, exactly members of mentioned taxa lived in the period of 90 to 50 million years ago. The culmination of developmant they reaches at thr Paleocene and Eocene, after wihch disappear. The fossilized remains of a given species are represented by teeth and the remains of the vertebrae. Tooth size, on average, varies from 10 to 20 mm, which assumed the total lenght from 200 to 300 cm, whith a maximum size up to 370 cm. Given taxon was widespread in today's North Africa (Morocco) and North America, mainly on the East Coast and Midwest. Comparative odontology studies discover the following pray of †Cretolamna: lagreg bonyfish, turtle,s mosasaur, squids and other sharks.
Phylogenetic and comparative odontology studies in this paper were performed on teeth of following species: †Cretolamna appendiculata Gluckman, 1958 from Morocco, †Otodus obliquus (Agassiz, 1843) from Portugal and †Carcharocles megalodon (Agassiz, 1843) from Bosnia and Herzegovina; as well as other relevant taxa, together with consulting the available literature.
According to the current evolutionary-taxonomic views †C. appendiculata is considered as a direct ancestor of Oligocene species †C. megalodon, although philogenesis itself is till not clarified. This paper presents the potential phylogenetic pathways of †C. appendiculata with emphasizing the incremental specific adaptive changes based on dental morphology, through certain intermedial forms.
Presented study is one ot he basic steps in the current reseraches of phylogeny and evolution of the family †Otodontidae Gluckman, 1964 wihch appears in the Paleocene and became extinct in Pliocene.
Key words :
Thematic field:
Prirodne nauke
Date:
10.10.2014.
7. Studenti u susret nauci sa međunarodnim učešćem, StES2014
