cow shark การใช้

• The order Hexanchiformes is a very small and primitive order consisting of cow sharks and frilled sharks.
• Cow sharks are ovoviviparous, with the mother retaining the egg cases in her body until they hatch.
• Cow sharks are fairly large and stocky, while frilled sharks are smaller and have eel-like bodies.
• Cow sharks are considered the most primitive of all the sharks, as their skeletons resemble those of ancient extinct forms, with few modern adaptations.
• It is also known as sevengill shark or simply sevengill and was formerly known as cow shark and mud shark; it is called sevengill due to its seven gill slits.
• The broadnose sevengill shark is also known as sevengill shark or simply sevengill and was formerly known as cow shark and mud shark; it is called sevengill due to its seven gill slits.
• The "'bigeyed sixgill shark "'( " Hexanchus nakamurai " ) is a cow shark of the dorsal surface has a brownish-gray color, and is sharply separated from the light coloring of its ventral surface.
• More recent investigations have found the similarities between the frilled shark and extinct groups may have been overstated or misinterpreted, and this shark exhibits a number of skeletal and muscular traits that firmly place it with the neoselachians ( modern sharks and rays ), and more specifically with the cow sharks in the order Hexanchiformes ( though systematist Shigeru Shirai has proposed that it be placed in its own order, Chlamydoselachiformes ).