In the Submeseta Allomember, there is a dramatic diminution of diversity of those selachians
that dominated below, there are no teleost taxa characteristic of warm water (e.g., Labridae, Oplegnathidae, Xiphiorhynchidae), sharks dramatically decreases in diversity and quantity (a few Pristiophorus and odontaspidid teeth) and begin to predominate some sharks (Lamna) and teleosts with species characteristic of colder waters (e.g., gadiforms of the informal genus "Mesetaichthys") are recorded.
Included in the selachians
were two species from the family Orectolobidae--Orectolobus maculatus (Bon-naterre, 1778) and Orectolobus ornatus (De Vis 1883); one species from the family Hemiscylliidae--Hemiscyllium ocellatum (Bonnaterre, 1788); and two species from the family Carcharhinidae-Carcharhinus melanopterus (Quoy and Gaimard, 1824) and Negaprion acutidens (Riippell, 1837).
Cretaceous fishes, selachians
and ptychodonts: Univ.
(18.) Case GR: Late Eocene selachians
from South Central Georgia.
(1990) provided a preliminary list of the Lano vertebrates, including actinopterygians, lissamphibians, squamates, turtles, crocodyliforms, dinosaurs, pterosaurs, and mammals from the continental deposits, and selachians
from the marine beds.
& BALBINO, A,C., 2003: Uppermost Miocene lamniform selachians
(Pisces) from the Alvalade basin (Portugal).--Ciencias da Terra, 15: 141-154.
& PENCE, R.,1989: Selachians
from the Hosta Tongue of the Point Lookout Sandstone (Upper Cretaceous, Santonian), Central New Mexico.New Mexico Geol.
(sharks and rays), such as Isurus desori, Isogomphodon caunellensis, and Hemipristis serra, from San Gerardo de Limoncito are Miocene taxa (Laurito & Valerio, 2008a).