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  2. Elasmobranchii - Wikipedia

    en.wikipedia.org/wiki/Elasmobranchii

    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 ...

  3. Placoderm - Wikipedia

    en.wikipedia.org/wiki/Placoderm

    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 ...

  4. Category:Elasmobranchii - Wikipedia

    en.wikipedia.org/wiki/Category:Elasmobranchii

    Pages in category "Elasmobranchii" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. ...

  5. Nurse shark - Wikipedia

    en.wikipedia.org/wiki/Nurse_shark

    The nurse shark genus Ginglymostoma is derived from Greek language meaning hinged mouth, whereas the species cirratum is derived from Latin meaning having curled ringlets. . Based on morphological similarities, Ginglymostoma is believed to be the sister genus of Nebrius, with both being placed in a clade that also include species Pseudoginglymostoma brevicaudatum, Rhincodon typus, and ...

  6. Manta ray - Wikipedia

    en.wikipedia.org/wiki/Manta_ray

    The pair then parts, the female being left with scars on her fin. [33] [12]: 46 The fertilized eggs develop within the female's oviduct. At first, they are enclosed in an egg case while the developing embryos absorb the yolk. After hatching, the pups remain in the oviduct and receive additional nutrition from milky secretions called histotroph ...

  7. Sawfish - Wikipedia

    en.wikipedia.org/wiki/Sawfish

    Uniquely in this family, the narrow sawfish has a relatively fast reproduction rate (generation length about 4.6 years, less than one-third the time of the other species), it has experienced the smallest contraction of its range (30%) and it is one of only two species considered Endangered rather than Critically Endangered by the IUCN. [2]

  8. Marbled electric ray - Wikipedia

    en.wikipedia.org/wiki/Marbled_electric_ray

    Risso's illustration of the marbled electric ray, accompanying his original species description. French naturalist Antoine Risso described the marbled electric ray as Torpedo marmorata in his 1810 Ichtyologie de Nice, ou histoire naturelle des poissons du département des Alpes maritimes (Ichthyology of Nice, or natural history of fishes in the Alpes-Maritimes).

  9. Yellow stingray - Wikipedia

    en.wikipedia.org/wiki/Yellow_stingray

    The yellow stingray (Urobatis jamaicensis) is a species of stingray in the family Urotrygonidae, found in the tropical western Atlantic Ocean from North Carolina to Trinidad. ...

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