Search the Community
Showing results for tags 'extant and fossil teeth'.
-
Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) extant and fossil teeth
MarcoSr posted a topic in General Fossil Discussion
Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) are both filter feeders. The extant species are Rhincodon typus and Cetorhinus maximus. Their teeth size is very small compared to body size (Rhincodon typus max size: 17 to 21 meters and Cetorhinus maximus max size: more than 10 meters, Ebert 2013). Below I show pictures of both extant teeth and fossil teeth. Both Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) fossil teeth are very uncommon worldwide. However these teeth can be found regularly at two United States sites. Cetorhinus teeth are very common from the Miocene Round Mountain Silt Formation (Shark tooth Hill) in Bakersfield, California (Ernst Ranch). Rhincodon, although not really common, can be found regularly in the Miocene spoil piles from the Lee Creek Mine in Aurora North Carolina. I show pictures of teeth from both these sites below. Extant Rhincodon typus teeth: Small tooth section from a jaw (25 mm by 20 mm) Multiple views of two teeth (both 4 mm) Fossil Rhincodon teeth from the Lee Mine, Aurora NC: Three teeth (all 3.5 m) Extant Cetorhinus maximus teeth: Small tooth section from a jaw (20 cm by 3 cm) Multiple views of a single tooth (10 mm) (I have hundreds of fossil teeth from the Ernst Ranch with the largest being only around 7.5 mm). Fossil Cetorhinus huddlestoni teeth from the Ernst Ranch, Bakersfield CA: 5 teeth (6.5 mm, 6.5 mm, 5 mm, 7 mm & 6 mm) Note the cusplets on the below two teeth (both 3 mm). Cusplets are a feature of a number of juvenile tooth positions. The mesial cusplets are reduced or lost, although some are retained in adult teeth Welton 2014. Marco Sr.- 17 replies
-
- 11
-
- cetorhinus
- extant and fossil teeth
-
(and 1 more)
Tagged with: