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The common name "toothfish" refers to the two rows of teeth in the upper jaw, thought to give it a shark-like appearance. The genus name Dissostichus is from the Greek dissos (twofold) and stichus (line) and refers to the presence of two long lateral lines that enable the fish to sense prey.
Machairodontinae is an extinct subfamily of carnivoran mammals of the family Felidae (true cats). They were found in Asia, Africa, North America, South America, and Europe, with the earliest species known from the Middle Miocene, with the last surviving species (belonging to the genera Smilodon and Homotherium) becoming extinct around Late Pleistocene-Holocene transition (~13-10,000 years ago).
The roughtail catshark or marbled catshark (Galeus arae) is a common species of deepwater catshark, belonguing to the family Pentanchidae.It is found at a depth of 36–702 m (118–2,303 ft) in the northwestern Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea, from North Carolina to Costa Rica.
Scyliorhinidae is a family of sharks, one of a few families whose members share the common name catsharks, belonging to the order Carcharhiniformes, the ground sharks. Although they are generally known as catsharks, some species can also be called dogfish due to previous naming. [2]
The teeth of S. canicula are larger in males than in females; in addition, male S. canicula from West African waters have stronger, larger, and more calcinated jaws. The differences in mouth dimensions and tooth length between males and females, and between immature and adult males, could be due to different feeding habits or adaptations for ...
A handful of fossil teeth from a completely new species suggests the creatures emerged some 440 million years ago. Ancient shark-like fish appeared much earlier than previously thought – study ...
Pentanchidae, a family of ground sharks with the overall name deepwater catsharks, but many species are referred to as "catshark". This species in this family were formerly included in the Scyliorhinidae. Atelomycteridae, a family of ground sharks with the overall name coloured catsharks, but many species are referred to as "catshark". This ...
In fish, Hox gene expression regulates mechanisms for tooth initiation. [1] [2] However, sharks continuously produce new teeth throughout their lives [3] [4] [5] via a drastically different mechanism. Shark teeth form from modified scales near the tongue and move outward on the jaw in rows until they are eventually dislodged. [6]