Science: Mollusks, Worms, Arthropods, Enchinoderms Flashcards
Mollusks:
soft-bodied invertebrates with bilateral symmetry and usually one or two shells wit organs in a fluid-filled cavity
Mantle:
thin tissue layer that covers body organs
A mantle cavity has gills which:
exchange Carbon Dioxide and Oxygen
underside:
muscular foot for movement
gastropods have how many shells?
usually one
Mollusks are classified based on…
shell presence, shell type, and foot type
cephalopods: (squid, octopi, cuttlefish, nautiluses)
complex mollusks with a brain (cephla) and foot (opod)
Bivalves have hinged, __ ____ shell and include…
two part shells / clams, oysters, scallops
snails, garden slugs, and conchs are in what category?
gastropods
radula:
tongue like organ with rows of teeth to get food
what do cephalopods use to catch prey?
tentacles
jet propulsion:
squeezing a liquid/gas to move faster
mollusks provide for _____ like pearls
shells
Annelids:
segmented worms with setae (bristlelike structures) to hold on to soil and move; mouth and anus, and bilateral symmetry
Earthworms move with what?
setae and 2 sets of muscles
Gizzard:
what grinds soil and organic matter
Earthworms use ______ to grind and ingest soil and put it into the crop for storage
gizzards
What circulatory system do Earthworms have?
closed
Earthworms are herm_____
hermaphrodites
Marine Worms:
or polychaetes, have segments with setae, are sessile, and ones like the bristleworm are sessile
Leeches:
segmented worms w/o setae that feed on blood
Leeches are used in ______
medicine
Leeches release chemicals that are being studied as ___________
treatments
segmented worms aerate the _____ and produce good chimicals
soil
Segmented worms may have evolved in…
the sea
Appendages:
jointed parts of arthropods
exoskeleton:
a body cavity that digests arthropods
Some arthropods have many or ____ segments
fused
molting:
replacing of an exoskeleton
What body regions do insects have?
thorax, antenae, and abdomen
spiracles:
openings in the abdomen in which waste gas leaves
eggs, nymphs, and adults are what type of metamorphisis?
incomplete
Arachnids:
spiders and ticks that have a cephalothorax and abdomen
scorpions have poison stingers at the end of their…
abdomen
Spiders inject prey with _______ to digest
enymes
mites and ticks are ________ that cause disease
parasites
Crustations:
crabs, shrimp, and barnacles with 1/2 pairs of antennae and mandibles to crush food
Arthropods can be _______ that carry diseases, and also ____
pests, food
_______ can kill insects but cause environmental problems
insecticides
arthropods may have evolved from…
segmented worms
Enchinoderms:
have an endoskeleton with radial symmetry, with mouth and intestines, but no head/brain
water-vascular system: (thin blood)
allows enchinoderms to move and exchange CO2 with H20 food and release waste
Sea stars:
have 5+ arms and reproduce sexually and can regenerate
Battle Stars:
allow a predator to break off an arm, allowing it to escape and regenerate
sea urchins and sand dollars:
disk/glove shaped animals with spines
sea cucumbers:
soft bodied with a leathery covering
enchinoderms help ________
recycle
