Elasmobranchii


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Elasmobranchii

[ə‚laz·mə′braŋ·kē‚ī]
(vertebrate zoology)
The sharks and rays, a subclass of the class Chondrichthyes distinguished by separate gill openings, amphistylic or hyostylic jaw suspension, and ampullae of Lorenzini in the head region.

Elasmobranchii

 

a subclass of cartilaginous fishes. The skeleton is cartilaginous and often calcified. The body is covered with placoid scales or, sometimes, is naked. The gills are lamellar. There is no gill cover; five to seven pairs of gill clefts open directly to the exterior. The mouth is inferior. The intestine has a spiral fold and opens into the cloaca. In males the terminal rays of the ventral fins are converted into copulatory organs, or pterygopodia. The subclass comprises two extinct orders and one extant order, the Selachii, which includes sharks (three suborders) and rays. Elasmobranchii first appeared in the Devonian. Most of the fishes inhabit seas; a few are encountered in fresh waters.

References in periodicals archive ?
Tiburones y rayas de Colombia (Pisces: Elasmobranchii): lista actualizada, revisada y comentada.
Encephalization and Brain Organization of Mobulid Rays (Myliobatiformes, Elasmobranchii) with Ecological Perspectives.
(2008): Registro de Serratolamna serrata (Elasmobranchii: Serratolamnidae) en el Cretacico Superior (Maestrichtiense) de los Andes Venezolanos.
Along with this taxon, five additional families contribute slightly more than two thirds (69.3%) of the assemblage NISP: surgeonfishes, sea bases, sharks and rays (Elasmobranchii), wrasses, and leatherjackets.
A Ptychodontid (Chondrichthyes, Elasmobranchii) from the upper Cretaceous of South America.
Celulas sanguineas de Schroederichthys chilensis (Guichenot, 1848) (Elasmobranchii, Scyliorhinidae): La serie blanca.
Kingdom Animalia Phylum Chordata Class Chondrichthyes Subclass Elasmobranchii Superorder Batoideo OrderRajiformes Families Anacanthobatidae Plesiobatidae Dasyatidae Potamotrygonidae Gymnuridae Rajidae Hexatrygonidae Rhinobatidae Myliobatidae Urolophiidae Table 2: Antibiotics used in the treatment of uncomplicated infections and wound prophylaxis.
Catalogo sistematico de las rayas y especies afines de Mexico (Chondrichthyes: Elasmobranchii: Rajiformes: Batoideiomorpha).
(Elasmobranchii: Dasyatidae) from the South China Sea Off Sarawak, Borneo, Malaysia.
Mesozoic and Cenozoic Elasmobranchii. Handbook of Paleoichthyology, Gustav Fischer Verlag, Stuttgart.
The GenBank taxonomy database currently comprises DNA sequences from more than 50,000 species, of which more than 9600 are vertebrate species, including 110 Elasmobranchii and 80 Cetacea.
The Chondrichthyes are represented by two subclasses: Holocephali and Elasmobranchii. The holocephalans from this suite include Helodus (Heliodontidae), Chitonodus (Chochliodontidae), and two flat tooth plates that are likely chochliodonts (Figure 1).