lab 2 exam Flashcards
be able to identify everything
defining characteristics of rotifers
eutelic - only has a set number of cells
corona - anterior region of hair like cilia used for food collection and locomotion
pharynx - hardened jaws adapted for grasping, piercing or grinding prey
Defining characteristics - Annelids
appendix
what is Clitellum ?
large band about 1/3 ways down worms body, used during reproduction to transfer sperm between individuals and secreting a cocoon that holds the fertilized egg
difference in annelids and nematodes
annelids are segmented and do not have tapered ends
nematodes are unsegmented and have tapered ends (round worm)
defining characteristics Nematode:
bilateral symmetry, covered by a thin, tough cuticle,
some are free-living and some are parasitic
one parasitic nematode and how it effects the host
Ascaris Lumbricoides- affects humans and pigs, growth retardation and malnutrition
defining characteristics Arthropods
segmentation, specialized sense organs, chitin exoskelaton
grasshoppers
three body segments, three pairs of legs, one pair of antennae, and wings
crayfish
two body segments, five pairs of legs, two pairs of antennae and claws
grasshoppers and crayfish
both arthropods, have segmented bodies, exoskeletons made out of chitinc
compare and contrast male and female crayfish
female crayfish are smaller, have smaller claws, wider tails, and larger swimmerets compared to males
compare and contrast male and female grasshoppers
female grasshoppers are larger and greener then the males, males are typically brown, black or tan. Females have an ovipositor
hexapod
example, bumble bee, head thorax, and abdomen, three pairs of legs on thorax one pair of antennae, one pair of mandibles
crustecea
example, lobster, two pairs of antennae, one pair of mandibles
Myriapoda
example, centipede, body divided into head and segmented trunk, one or two pairs of legs per body segment, one pair of antennae
chelicerata
black widow spider, lack of antennae and mandibles
trilobitomorpha
ex trilobites, extinct
why are hexapods one of the most successful of the arthropods
wings
pros and cons of an exoskeleton
pros: better protection for internal organs, protection from predators, prevents animal from drying out
cons: exoskeleton does not grow with animal, they have to molt
pros and cons of open circulatory system
pros: deal with extreme temperature and pressure
cons; its not as efficient as a closed circulatory system
which class has the most species and why?
Hexapods - wings, more complex feeding, coevolution of angiosperms and insect pollinators
beetles are within this group and they have the most species
defining characteristics Chondrichthyes
fusiform body and lateral line system
has eyes, nostrils, mouth and spiracles (modified gill slits)
male Chondrichthyes from females
males have claspers
pros and cons of cartilaginous skeleton
pros: less dense, less energy needed to move fast, provides best bending support
cons: less protective, doesn’t provide unbending support
