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Gnathostomata /ˌneɪθoʊstoʊˈmɑːtə/ are the jawed vertebrates. The term derives from ... In addition to this, some placoderms were also shown to have a third pair of paired appendages, that in males had been modified to claspers and basal plates .... including living and extinct amphibians, reptiles, birds, and mammals.


Birds (Aves), a subgroup of reptiles, are the last living examples of dinosaurs. They are a group ... Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ... Wings, which evolved from forelimbs, gave birds the ability to fly, although further .... He assigned other names to the other groups.


A forelimb is an anterior limb on a terrestrial vertebrate's body. For quadrupeds, the term ... largely of feathers supported on much reduced fingers, with finger 2 supporting the alula and finger 4 ... homologies between birds and bats, with much closer homologies between any pair of bird species, or any pair of bat species.


2. Compare the human amino acid sequence with each of these five animals by ... Paired appendages and spinal column: in all species except lamprey ... Write your answer in the hexagon below the arrow pointing to the name of that animal. ... Chickens and turkeys are both birds and have the same sequence of amino ...


The superclass Tetrapoda contains the four-limbed vertebrates known as tetrapods ); it .... Tetrapoda includes four classes: amphibians, reptiles, mammals, and birds. .... 2) Tiktaalik represents a case of parallel evolution. ..... The paired fins of the early sarcopterygians were smaller than tetrapod limbs, but the skeletal  ...


The appendicular skeleton includes the paired fins or limbs and the girdles, the ... General name, Forelimb, Hind limb ... Only three digits are present; these are most likely 1, 2, and 3, based on comparisons with Archaeopteryx, the first bird.


Feb 10, 2008 ... According to the lateral-fin theory, paired limbs are derived from ... (Bottom) Names of corresponding parts of pelvic appendages are shown in ... which is jointed with the skull, (2) supracleithrum, (3) cleithrum and (4) clavicle. ... Elements of the girdle of the reptiles were modified in birds to permit flight.


Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, ... External anatomy (topography) of a typical bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, ... The hind limb has an intra-tarsal joint found also in some reptiles. .... Each pair of dorso-ventrobronchi are connected by a large number of parallel  ...


All have a 2-part carapace covering the head and thorax. • Have antennae ... Do not have antennae; usually have 6 pairs of jointed appendages, the last 4 ... One pair of antennae ... The vertebrates (mammals, birds, “reptiles”, amphibians, and.


2 - consist of membrane & replacement bones (in bony vertebrates) ... with even vestiges of anterior limbs, e.g., turtles & birds & mammals. Pelvic girdles. brace posterior paired appendages; no dermal components (unlike pectoral girdle).