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Elasmobranchii (/ ɪ ˌ l æ z m ə ˈ b r æ ŋ k i aɪ / [6]) is a subclass of Chondrichthyes or cartilaginous fish, including modern sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea).
Batoids reproduce in a number of ways. As is characteristic of elasmobranchs, batoids undergo internal fertilization . Internal fertilization is advantageous to batoids as it conserves sperm, does not expose eggs to consumption by predators, and ensures that all the energy involved in reproduction is retained and not lost to the environment. [ 6 ]
Elasmobranchii is a subclass that includes the sharks and the rays and skates. Members of the elasmobranchii 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 upper jaw is not fused to the cranium, and the lower jaw is ...
The New York City Economic Development Corporation's Early Stage Life Sciences Funding Initiative and venture capital partners, including Celgene, General Electric Ventures, and Eli Lilly, committed a minimum of US$100 million to help launch 15 to 20 ventures in life sciences and biotechnology in 2014, [6] and in January 2018, the City of New ...
It is known that the shark has not come into contact with any other bamboo sharks since 2013. Although parthenogenesis is observed in a small number of species, this is such a rare occurrence in this species that it became a news story. [10]
Pastinachus is a genus of stingrays in the family Dasyatidae.This genus was long held to be monotypic, containing only the cowtail stingray (P. sephen).Recent studies of Indo-Pacific stingrays have revealed that there are in fact a number of different species of Pastinachus, and that some former junior synonyms may need to be resurrected.
Xenacanthida (or Xenacanthiformes) is an order or superorder of extinct shark-like chondrichthyans (cartilaginous fish) known from the Carboniferous to Triassic.They were native to freshwater, marginal marine and shallow marine habitats. [1]
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