Chondrichthyes fins
Chondrichthyes are jawed vertebrates with paired fins, paired nares, scales, and a heart with its chambers in series. Extant chondrichthyes range in size from the 10 cm (3.9 in) finless sleeper ray to the 10 m (32 ft) whale shark. See more Chondrichthyes is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or bony fishes, which have skeletons primarily composed of See more Fertilization is internal. Development is usually live birth (ovoviviparous species) but can be through eggs (oviparous). Some rare species are See more • Note: Lines show evolutionary relationships. See more • Taxonomy of Chondrichthyes • Images of many sharks, skates and rays on Morphbank See more Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, except in See more Cartilaginous fish are considered to have evolved from acanthodians.The discovery of Entelognathus and several examinations of acanthodian … See more • List of cartilaginous fish • Cartilaginous versus bony fishes • Largest cartilaginous fishes See more Web2 days ago · The pectoral fin is characterized by three features: 1) a large number of segments in the radial cartilages; 2) highly elastic pectoral fin skin; and 3) a vertically-rotated hinge joint at the ...
Chondrichthyes fins
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WebPelvic fins in some male Chondrichthyes become modified as claspers. In remoras, anterior dorsal fin forms an adhesive disc or sucker on head. In some teleosts the anal fin forms an intromittent organ or ovipositor. ... WebClass Chondrichthyes (sharks, rays, dogfishes, ratfishes) Fins High speed locomotion Class Osteichthyes (bony fishes) Subclass Actinopterygii (ray finned fishes) Locomotion Feeding Subclass "Sarcopterygii" Review of innovations, locomotory and feeding specializations Brief Review: Deuterostome Relationships ...
WebThe three types of paired fins are: - fin-fold fins(Chondrichthyes) - fins which evolved from endoskeletal pterygiophore elements added to ventrolateral folds in the body wall … WebFast Facts. Description. Rays in the order Chondrichthyes are essentially a compressed, flattened shark. The pectoral fins are fused to the head region into a disc and, in many species, the head is raised above the disc. Most species have a long, whip-like tail and many possess at least 1 venomous spine located along the tail.
http://devoniantimes.org/who/pages/sharks.html WebThe earliest sharks (class Chondrichthyes) first appeared in the Early Devonian about 400 million years ago, became quite prominent by the end of the Devonian, and are still successful today. Two Early Devonian orders of primitive sharklike fishes, the Cladoselachiformes and the Cladodontiformes, became extinct by the end of the …
WebIntroduction to the Chondrichthyes. Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or "cartilaginous fish." First appearing on Earth almost 450 million years ago, cartilaginous fish today …
WebThey have jaws and paired fins. They have 5 to 7 pairs of gills to aid in respiration. The male individuals have a reproductive organ which is termed as clasper. Chondrichthyes … first of the month following 30 days excelWebThe classification of chondrichthyans is a somewhat controversial subject. Many sharks, skates, and rays are difficult subjects for taxonomic study. The taxonomic review provides principal identifying characteristics of all major extant groups. Class Chondrichthyes contains the subclasses Elasmobranchii (sharks and rays) and Holocephali (chimaeras … first of the month followingWebThis brilliant, spiny, and poisonous lionfish is just one of the world's20,000 living species of actinopterygians. The name means "ray-finned,"for unlike the Chondrichthyes, the fins … first of the major hebrew prophetsWebThe dorsal fin or fins and fin spines are rigid, not erectile. Scales, if present, are structurally minute teeth, called dermal denticles, each consisting of a hollow cone of dentine … first of the month gifWebDec 23, 2012 · • Chondrichthyes fish can move their upper jaw freely from the skull, but not the Osteichthyes fish. • Outer covering is scales in osteichthyes, whereas dermal denticles cover the skin in chondrichthyes. • Caudal fin is asymmetric in chonricthyes fish, but it is a symmetrical caudal fin in Osteichthyes. first of the month cinnamon ritualWebFishes not included in the Osteichthyes are the Chondrichthyes (sharks and their relatives), the Myxini (hagfishes), and the Cephalaspidomorphi (lampreys). ... fused teeth, and the presence of an air-breathing organ that opens to the esophagus. A lungfish's caudal fin is continuous with its dorsal and anal fins. Its pelvic and pectoral fins are ... first of the month cleanWebAt this time the chondrichthyan fishes, which had reached their greatest flowering during the Carboniferous, became greatly reduced. They remained so until the Jurassic (about 190 million years ago), when the areas of the … first of the month formula