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Showing results for tags 'macrorhizodus praecursor'.
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M. praecursor is a relatively common find in vertebrate lenses of the Castle Hayne Formation. Leriche (1905) believing the species to be an Eocene version of the much younger Oxyrhina desori (Isurus desori) erected Oxyrhina desori praecursor. Leriche (1942) erected Oxyrhina praecursor americana for teeth with slightly different root and blade characteristics. These were placed into Isurus (White, 1931) and eventually a new genus, Macrorhizodus by Glickman (1964). Both praecursor and americana were accepted as distinct species (White 1956, Ward & West 1990, Zhelezko & Kozlov 1999 and Case & Borodin 2000a). Ebersole, Cicimurri & Stringer 2019 determined through studies of the extant Isurus oxyrhynchus that these different characteristics are attributable to heterodonty and placed americana as a junior synonym of praecursor. References: Ebersole, Cicimurri & Stringer, 2019. Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichtyes and Osteichthyes) of the lower to middle Eocene (Ypresian to Bartonian) Clairborne Group in Alabama, USA, including an analysis of otoliths. pgs 56-58 as Isurus praecursor Chandler, Richard 2015. Fossil Fish, Volume 3 of 4. North Carolina Fossil Club. pgs 67-68 Case and Borodin, 2000. A Middle Eocene Selachian Fauna from the Castle Hayne Limestone Formation of Duplin County, North Carolina. Plate 3 fig. 21-26
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From the album: Sharks
An early Lamnid (family that includes the modern great white and mako sharks) from Central Kazakhstan. Some consider this genus to be ancestral to Carcharodon or both Carcharodon and Isurus. The latter is a tempting hypothesis since molecular clock studies place the last common ancestor of the great white and makos in this time.-
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From the album: Sharks
Macrorhizodus praecursor Extinct Mako shark Samlat Fm., Ad-Dakhla, Western Sahara This is one of the last common ancestors to the lineages that spawned the modern Great White and Mako.-
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Isurus praecursor/ Macrorhizodus praecursor
BellamyBlake posted a topic in General Fossil Discussion
Are Isurus praecursor and Macrorhizodus praecursor synonyms? I have conflicting accounts on this and would like clarification please. Thank you, Bellamy