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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  ...


Agnatha (Greek, "no jaws") is a superclass of jawless fish in the phylum Chordata , subphylum ... 1 Metabolism; 2 Body covering; 3 Appendages; 4 Reproduction; 5 Evolution ... Two types of Early Cambrian animal apparently having fins, vertebrate .... Gnathostomata · Amphirhina, an alternate name for the above parallel, ...


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 ...


Jan 16, 2013 ... Most of them are tetrapods, with four legs or leg-like appendages. ... have four- chambered hearts (2 atria, 2 ventricles), like mammals and birds.


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).


Vertebrates only represent 2-3% of the species on Earth but they are the species that people are ... All vertebrates are bilaterally symmetrical with paired appendages. ... Birds – Avians are endothermic, unlike reptiles, fish, and amphibians.


For example, amphibians, reptiles, and birds belong to the phylum Chordata. ... II. Introduction. An invertebrate is an animal without a backbone or vertebral column . ... The scientific name assigned to animals without backbones is Invertebrata, .... Arthropods are characterized by their paired, jointed appendages, which are ...


brain and spinal cord. 2. A flexible rod, the notochord, forms on the dorsal side of the primitive gut in the early embryo and is .... spinal column. The name vertebrate comes from the indi- ... great lines of terrestrial vertebrates, birds ( descendants of ... foot long, respired with gills, and had no paired fins—just a primitive tail to ...


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.