WebBody covering Most chondrichthyans have toothlike scales called dermal denticles or placoid scales. Denticles provide two functions, protection and in most cases, … Web1> Chondrichthyes are class of fishes which endoskeleton is made up of cartilage that's why the called as cartilaginous fishes. All the fishes under this category are marine. One of unique structure is it carries ventral …
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WebThe basic body plan of Chondrichthyans includes a skull, jaws, teeth, a backbone, fins, but lack ribs. Chondrichthyans have three types of unpaired fins - dorsal, caudal, and … Body covering. Chondrichthyans have tooth-like scales called dermal denticles or placoid scales. Denticles usually provide protection, and in most cases, streamlining. Mucous glands exist in some species, as well. 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 viviparous. There is no parental care after birth; however, some chondrichthyans do guard their eggs. 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 … See more Cartilaginous fish are considered to have evolved from acanthodians.The discovery of Entelognathus and several examinations of acanthodian characteristics indicate that bony fish evolved directly from placoderm like ancestors, while acanthodians represent a … See more • List of cartilaginous fish • Cartilaginous versus bony fishes • Largest cartilaginous fishes See more
WebBody covering Chondrichthyans have tooth-like scales called dermal denticles or placoid scales. Denticles usually provide protection, and in most cases, streamlining. Mucous glands exist in some species, as well. http://fsc.fernbank.edu/STT/VertBio/chondrichthyes.htm
WebBody covering: Their body is covered with tooth-like scales that have an enamel-like covering. These scales help in protection and streamlining. Some of the species have mucous glands as well, and there is evidence that shows a connection between the teeth and the dermal scales. WebMar 29, 2024 · They have backbones, from which they derive their name. The vertebrates are also characterized by a muscular system consisting primarily of bilaterally paired …
WebOsteichthyes ( / ˌɒstiːˈɪkθi.iːz / ), commonly referred to as the bony fish, is a diverse superclass of vertebrates, that have skeletons primarily composed of bone tissue. They can be contrasted with the Chondrichthyes, which …
WebOct 25, 2016 · The skin of cartilaginous fish is protected by a covering of abrasive placoid scales, called denticles. “The other main type of fish scales are those known as placoid scales or, more commonly and … pictures of a glass of waterWebJan 11, 2024 · Chondrichthyes are jawed fish that have paired fins, nostrils, scales, two-chambered hearts, and cartilage skeletons (rather than bone). Holocephali (sharks, rays, … top gun 2 enemy fighterWebchordates characteristics of a chordate dorsal, hollow nerve cord; notochord; pharyngeal pouches; post anal tail where does the hollow nerve cord run along on the chordate? the … pictures of a gmc terrainWebApr 13, 2024 · noun plural. Chon· drich· thy· es kän-ˈdrik-thē-ˌēz. : a class comprising cartilaginous fishes with well-developed jaws and including the sharks, skates, rays, … top gun 2 cgvWebSharks have fins on their back, sides, and stomachs. The fins on their back are called dorsal fins. Some species have one dorsal fin and others have two dorsal fins. In some species, … top gun 2 end creditWebJun 8, 2024 · The traditional groups include Agnatha, Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves, and Mammalia. Animals that possess jaws are known as gnathostomes, meaning “jawed mouth.” Gnathostomes include fishes and tetrapods (amphibians, reptiles, birds, and mammals). Tetrapods can be further divided into two … top gun 2 countdownWebClass Chondrichthyes -pre-date the dinosaurs -cover large depth range Chondrichthyes body form and respiration -streamlined body shape (fast swimming) -dorsal, pectoral (side) and caudal (tail) fins -gill slits behind the eye (different from other fish) -ventilate gills through movement, "ram ventilation" (enters mouth, over gills, through slits) pictures of a goiter neck