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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
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.
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.
(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).