WebAll chondrichthyans have internal fertilization, but maternal support of the embryo is highly variable. Many elasmobranchs lay large, yolky eggs immediately after fertilization; these … http://www1.lasalle.edu/~belzer/Bio-230/exam3.htm
Chordates and Fishes Flashcards Quizlet
Web3. What is a distinctive feature of the class Chondrichthyes? a. an amniotic egg b. unpaired fins c. an acute sense of vision that includes the ability to see in color d. a cartilaginous endoskeleton e. lack of jaws. 4. In which vertebrates is fertilization exclusively internal? a. Chondrichthyes, Osteichthyes, and Mammalia b. Amphibia ... WebAt 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 … cork arduino
CBSE Class 11-science Answered - TopperLearning
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. Capture-induced premature birth and abortion (collectively called … 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 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 Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column … See more • Note: Lines show evolutionary relationships. See more • Taxonomy of Chondrichthyes • Images of many sharks, skates and rays on Morphbank See more WebSep 25, 2024 · Chondrichthyes are a taxonomic class of cartilaginous fishes that encompass sharks and rays (elasmobranchs) and chimaera. Though there are exceptions, in general, Chondrichthyes have exposed gills, no swim bladder, internal fertilization, and placoid denticles. WebThere are nearly 850 living species in the class Chondrichthyes, an ancient, compact, and highly developed group. Although a much smaller and less diverse assemblage than the bony fishes, their impressive … cork angels craft