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Elasmobranchii is one of the two subclasses of cartilaginous fish in the class Chondrichthyes, the other being Holocephali . Members of the elasmobranchii subclass have no swim bladders, five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins, and small placoid scales. The teeth are in several series; the ...
Reproduction occurs in the winter in offshore waters, while pups are normally born in the warmer and deeper offshore waters where it is harder for humans and predators to reach them. The reproductive cycle begins when females produce several large eggs of yellow coloring, which become fertilized once they pass through the shell gland and are ...
Sawfish and their parts have been used for numerous things. In approximate order of impact, the four most serious threats today are use in shark fin soup , as traditional medicine , rostral teeth for cockfighting spurs and the saw as a novelty item. [ 4 ]
The claspers form a tube and a siphon propels semen from the genital papilla into the oviduct. [34] [12]: 41–42 The male continues to grip the female's pectoral fin with his teeth for a further few minutes as both continue to swim, often followed by up to 20 other males. The pair then parts, the female being left with scars on her fin.
A former Allianz fund manager was spared prison time on Friday over his role in a meltdown of private investment funds sparked by the COVID-19 pandemic that caused an estimated $7 billion of ...
The rhenanids were once presumed to be the most primitive, or at least the closest to the ancestral placoderm, as their armour was made of unfused components—a mosaic of tubercles—as opposed to the solidified plates of "advanced" placoderms, such as antiarchs and arthrodires. However, through comparisons of skull anatomies, rhenanids are ...
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Artificial intelligence has been a hot market throughout 2024. AI fueled the surge in share price for companies such as Nvidia, which saw its stock rise nearly 180% over the past year through Dec. 31.