________ develop into tadpoles, which undergo metamorphosis to become adults.
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hagfishes
The ________, which make up the Myxini, and the lampreys, which make up.
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Biologists
________ classify amniotes in two main groups: diapsids and synapsids.
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Jaws
________ and paired fins are absent in both hagfishes and lampreys.
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Tiktaalik
________ was a transitional form between fishes and tetrapods.
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Hemichordates
________ (acorn worms) are marine deuterostomes with a three- part body, including proboscis, collar, and trunk.
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Echinoids
________ lack arms; they have a solid shell and are covered with spines.
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Mammals
________ have hair, mammary glands, differentiated teeth, lungs with alveoli, completely divided ventricles, and three middle- ear bones.
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Eutherians
________ are more developed at birth than marsupials; they are characterized by a well- developed placenta, an organ of exchange that develops between the embryo and the mother.
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Synapsids
The ________ include the therapsids, which gave rise to the mammals.
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Class Holothuroidea
________ consists of sea cucumbers, animals with elongated flexible bodies.
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Amphibians
________ use their moist skin as well as lungs for gas exchange.
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Class Asteroidea
________ consists of the sea stars.
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Birds
________ have many adaptations for powered flight, including feathers; wings; and light, hollow bones containing air spaces.
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Vertebrates
________ have pronounced cephalization, a complex brain, a muscular pharynx, and muscles attached to the endoskeleton.
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Class Ophiuroidea
________ includes the brittle stars, which resemble sea stars but have longer, more slender arms that are set off more distinctly from the central disc.
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Lancelets
The ________ are cephalochordates, small, segmented, fishlike animals; their chordate characteristics are highly developed.
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Petromyzontida
The ________, have neither jaws nor paired fins.
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Monotremes
________ lay eggs.
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oral surface of crinoids
The ________ is turned upward; some crinoids are sessile.
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Neural crest cells
________ are embryonic cells important in the development of many structures, including the cranium and jaws.
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central disc
They have a(n) ________ with five or more arms, and they use tube feet for locomotion.
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Chondrichthyes
The ________ comprise the sharks, rays, and skates; they are jawed fishes with skeletons of cartilage.
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Hagfishes
________ are marine scavengers that secrete slime as a defense mechanism.
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jaws
They have ________, two pairs of fins, and placoid scales.
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Vertebrates
________ can be assigned to nine classes.
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Shared derived characters include
radial, indeterminate cleavage; the blastopore becomes (or is near the future site of) the anus; and pharyngeal slits at some time in the life cycle
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The chordatesĀ (Phylum Chordata) include three subphyla
Urochordata, Cephalochordata, and Vertebrata
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The extant (living) bony fishes can be assigned to three classes
Actinopterygii, ray finned fishes; Actinistia, coelacanths; and Dipnoi, lungfishes
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During the Devonian period, bony fishes gave rise to two evolutionary lines
th Actinopterygii, or ray-finned fishes, and the Sarcopterygii, or lobe-finned fishes
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Flashcard (27)