Exam 3

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191 Terms

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Invertebrates
no backbone, most diverse and numerous of land and ocean animals
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animals
multicelled heterotrophs with unwalled cells, develop from embryo to adult forms, all move during part or all of their lifetime
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all animals are ( ) and constitute the clade ( ) also called ( )
multicellular, Metazoa, Animalia
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clusters
the earliest animals were aggregations of cells
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jellies and cnidarians have ( ) tissue layers
two
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outer ectoderm and inner endoderm
no internal organs
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mesoderm
middle layer; internal organs develop from the mesoderm
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assymetrical
their body cannot be divided into two halves that are mirror images
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radial symmetry
body parts are arranged around a central axis; like spokes on a wheel
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bilateral symmetry
the body’s left and right halves are mirror images
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cephalization
evolutionary process in which cells and sensory structures become concentrated at the front of the body. Helps animals find food or avoid threats as it moves head first through the environment
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the two lineages of bilateral animals are
protosomes and deuterostomes
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protostomes
the first opening that appears in an embryo becomes the mouth. most invertebrate lineages
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deuterostomes
the second opening on the embryo’s surface develops into a mouth; the first opening is the anus. invertebrate lineage of echinoderms and all vertebrates
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sponge digestion
in sponges digestion is intracellular
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gastrovascular cavity
how cnidarians and flatworms digest; saclike cavity that functions in digestion and gas exchange
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pseudocoelom
roundworm digestion cavity; partially lines with tissue from mesoderm
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complete digestive tract
most bilateral animals have this; tubular gut with openings at either end has a coelom
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coelom
a body cavity fully lines with tissue derived from mesoderm (mesentery)
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colonial theory of animal origins
states that animals evolved from a colonial opisthokont protist
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choanoflagellate
the modern protist most closely related to animals
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earliest evidence of animals
biomarker characteristic of sponges found in 635 million years old sedimentary rock
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oldest evidence of animals dates to the ( ) 635-541 MYA
Edicaran
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Dramatic adaptive radiation
occured during the Cambrian (542-488 MYA); supercontinent Gondwana underwent ta dramatic rotation. movement of the landmass would have caused allopatric speciation worldwide
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all animal lineages present by the end of the period
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sponges have no
tissues or organs
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sessile
live attached to a surface
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suspension feeders
filter food from the surrounding water
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collar cells
make up sponges; different specialized cells that line the inner surface
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hermaphrodites
each individual can produce both eggs and sperm
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larva
sexually immature form that differs from the adult in its body plan
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body plans of cnidarians
radially symmetrical and have two tissue layers. no internal organs
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medusa
bell/dome shaped cnidarian body fringed by tentacles
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polyp
pillarlike cnidarian body topped with tentacles
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cnidocytes
specialized cells. stinging cell unique to cnidarians. sting the prey, tentacles push the prey through the mouth
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nerve net
mesh of nerve cells with no central control organ
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Hydrozoan
cnidarian class. ex: Hydra, a freshwater predatory polyp
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anthozoans
cnidarian class, corals and sea anemones; coral reefs consist of colones of polyps that enclose themselves in a framework of secreted calcium carbonate
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cubozoans
cnidarian class; box jellies, active swimmers with structurally complex eyes complete with a lens
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scyphozoans
cnidarian class, jellies that wash up on beaches, Portuguese man-of-war
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pharynx
tube connecting the mouth to the digestive track. a muscle in flatworms
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ganglia/ganglion
cluster of nerve cell bodies. simple brain in flatworms
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nerve cords
bundle of nerve fibers that runs the length of the body in many invertebrates. found in flatworms
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penis fencing
some marine flatworms will battle over who will assume the male role in this behavior
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closed circulatory system
system in which blood flows to and from a heart or hearts through a continuous series of vessels. found in bilateral annelid worms.
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polychaetes and oligochaetes have ( ) bristles on their segments
chitin-reinforced
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clitellum
during mating this secretory organ produces a mucus that glues two worms together as they swap sperm. found in earthworms
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mantle
skirt-like extension of the upper body. found in mollusks
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all mollusks have..
a complete digestive tract and reduced coelom
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radula
tongue like organ hardened with chitin. found in mollusks, chitons
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open circulatory system
circulatory system in which fluid leaves vessels and mingles with tissue fluid before returning to the heart. found in mollusks.
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molting
shedding and replacement of an animal body part. found in roundworms
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arthropod sex
sexes are usually separate but there are some hermaphrodites
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arthropod
invertebrate with jointed legs and a hard exoskeleton that is periodically molted; insect and crustaceans
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compound eye
of some arthropods; an eye that consists of many individual units, each with a lens, excels at detecting movement
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antenna
of some arthropods, sensory structure on the head that detects touch and odors
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exoskeleton
hard external parts that muscles attach to and move
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earliest known fossil of a land animal
myriapod 428 MYA
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chelicerata
subphylum of arthropod; two main body segments: a cephalothorax (fused head and thorax) and an abdomen. paired with specialized feeding appendages (chelicerae) that give it its name.
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arachnids
arthropod class. almost all terrestrial: spiders, scorpions, ticks, mites
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myriapoda
subphylum of arthropod. elongated bodies composed of several segments; usually nocturnal ground dwellers and predators
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crustacea
subphylum of arthropod. “insects of the sea” two main body segments: cephalothorax and abdomen
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echinoderms
the largest group of invertebrate deuterostomes
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chordates
group of biaterally symmetrical, coelomate animals. have a complete digestive system and a closed circulatory system
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traits unique to chordate embryos
notochord, hollow nerve cord runs parallel to notochord, gill slits, muscular tail
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notochord
stiff, flexible connective tissue; stiff rod of connective tissue that runs the length of the body in chordate larvae or embryos
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Lancelets
invertebrate chordate. subphylum cephalochordata
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tunicates
invertebrate chordate. subphylum urochordata; studies of genes and development have identified these as most closely related to vertebrates
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endoskeleton
internal skeleton
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first vertebrates
jawless fish that sucked up food
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tetrapods
four legged walkers; vertebrate that has four bony limbs or is a descendant of a four-limbed ancestor
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amniotes
vertebrate with eggs that enclose the embryo within a waterproof membrane; most diverse land vertebrates. branched off from an amphibian ancestor during the Carboniferous
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fishes
first vertebrate lineage to evolve
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Cyclostomata
fish clade meaning round mouthed. includes Lampreys and Hagfishes
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cloaca
an opening that serves as the exit for digestive and urinary waste, and also functions in reproduction. a multipurpose opening
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Lampreys
don’t feed as adults, some are parasites of fish.
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scales
hard, flattened structures that cover the skin
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placoderms
early jawed fish. means “tablet skin” from their bony armor. lived during Devonian period, some were very large and inhabitated what is now Ohio
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acanthodians
spiny fins. early fish species. went extinct at the end of the Permian. arose during same time as placoderms
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cartilaginous fishes
Chondrichthyes; jawed fish with a skeleton that consists of mainly or entirely of cartilage. most are sharks and rays. cloaca functions in reproduction and to remove wastes.
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ray finned fishes
Actinopterygii; bony fish that has fin supports derived from skin
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lobe-finned fishes
Sarcopterygii; bony fish that has thick fleshy fins supported by bones. sexes are separate and fixed
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ray-finned fishes
have thin, membranous fins, swim bladder
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swim bladder
gas-filled (sac) that can be adjusted to regulate buoyancy. found in ray finned fish
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teleost
lineage of ray-finned fish. includes 99% of ray-finned fishes (about half of all vertebrates)
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marine coelacanths
lineage of lobe-finned fishes. thought to be extinct until 1938 when a living one of this was found in the Indian Ocean, now know of several modern species
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freshwater lungfishes
lineage of lobe-finned fish. have lungs, oxygen diffuses from the lungs into the blood
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amphibians
scaleless, land-dwelling vertebrates. first tetrapods
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dinosaurs and birds
birds branches off from a dinosaur lineage during the Jurassic
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endotherms
maintain body temperature by adjusting metabolic heat production
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ectotherms
body temperature varies with the environment
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squamata
reptiles; lizards and snakes. Most diverse group of modern reptiles
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turtles
Testudines. toothless, bony, keratin-covered shell attached to skeleton
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crocodilians
crocodiles, alligators, and caimans. closest living relatives to birds
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feathers
filamentous keratin structures that derived from scales
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bird reproduction
fertilization occurs through the cloaca
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monotremes
mammal. least diverse group of mammals, egg laying, oldest surviving mammal lineage, don’t have nipples but produce milk. include echidnas and the platypus
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marsupials
pouched mammals. young briefly develop in mother’s body, finish development inside mother’s pouch. have a cloaca, mostly in australia.
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placental mammals
develop for an extended period inside the mother’s body where they are nourished by means of a placenta
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placenta
organ that forms during pregnanacy and allows diffusion of substances between the maternal and embryonic bloodstreams