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91 terms

BIO. Invertebrates

STUDY
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Invertebrates are categorized by the fact that ther are _____________, ________________
________________
multicellular, heterotrophic, eukaryotes
how do heterotrophs get their food?
they must consume others
A hollow ball of cells
blastula
The development of the layers of a blastula
gastrulation
The cell within the tissue layers is called a ?
gastrula
___ ______ helps with the development of a body form
Hox Gene
What is considered to be the common ancestor of animals?
protista
A lack of symmetry is considere _________
asymmetrical
based on 4 or 5, this symmmetry is based on an axis
radial symmetry
mirror image symmetry
bilateral symmetry
The top/back side of an animal is called
dorsal
the bottom/stomach side is called
ventral
which animals have a anterior and posterior end
bilaterally symmetrical
the head of an animal is called
anterior
The tail of an animal is called
posterior
the development of the head is called?
cephalization
An animal with 2 germ layers is called?
Diploblastic
Animals with all 3 germ layers are called?
triploblastic
A true body cavity is called a _________
coelom
To be a true coelom there needs to be a _______________________________
completely lined cavity
when the mesoderm is only partially lined
pseudocoelom
an animal without a coelom is called
acoelomate
In a _________ cleavage is spiral and determinant
protostome
In a ____________ cleavage is radial and indeterminant
deuterostome
THe splitting of initially solid masses of mesoderm to form the coelomic cavity is called _______ development
schizocoelous
in deuterostome development the formatio of the body cavity is described as __________
enterocoelous
What develops first in a protostome
mouth
What develops first in a deuterostome
anus
Invertebrates account for __%of species
95
The first category of invertebrates are ________
Porifera
An example of a porifera is a
sponge
Sponges cant move which means they are
sessile
collar cells are also called
chaonocytes
an example of a filter feeder is a
sponge
which invertebrate has no tissue, organs or systems?
sponges
how do sponges get their food>
suspension feeders
what is the purpose of choanocytes?
generates a water current
2nd group of invertebrates
cnidaria
An example of cnidaria is
jellyfish
cnidarians have ____________ symmetry
radial
how many layers of cells do cnidarians have?
2
what are the two forms of cnidarians
polyp and medusa
unique cells in cnidarians that function in defense
cnidocytes
Hydrozoa, scypnozoa, cubozoa and anthozoa are examples of ?
Cnidarians
Platyhelminthes are also known as
flatworms
where do flatworms live?
aquatic environments
tapewoms, flukes and planaria are examples of
flatworms
which invertebartes have only one opening?
flatworms
can planarians regenerate?
yes
Turbelleria, monogenea, tremotoda, and cestoda are examples of?
flatworms
what is an examle of a parasitic flatworm?
tapeworm
Rotifers reproduce by
parthenogenesis
probiscis are also known as
nemerteans
which category of invertebrates have a muscular foot, visceral mass and a mantle
molluscs
examples of gastropods include:
slugs, snails, and conches
examples of bivalves include
clams, oysters and scallops
examples of cephlapods include:
octopus and squid
the 1st animals with a simple brain are
molluscs
what kind of circulatory system do mollusks have
open
the name of mollusk's larvae is
trachopore
about 3/4 of all mollusks are
gastropods
In a process called ___________ the animals anus and mantle end up above the head
torsion
segmented worms are called
annelids
oligochaeta,polychaeta and hirundinea are examples of?
annelids
bristles made of chitin are called
septae
examples of annelids are
leeches and earthworms
nonsegmented pseudocoelomates are called
nematodes
whats found in soil and eggs enther children's mouth
ascaris
the most common roundworm is the _____
pinworm
what is found in uncooked pork
trichinella
common in warm climates, found in contaminated soil and enters body through feet when people walk barefoot
hookworm
Segmented coelomates that have an exoskeleton and jointed apppndages
arthropods
_ out of _ species is an arthropod
2; 3
early arthropods were called
trilobites
1st animals with jointed appendages
arthropods
all arthropods have an _______________
exoskeleton
the 3 fused body parts are called
head, thorax,abdomen
specialized jaws are called
mandibles
uses ___________ _____ for excretion of waste
malpighian tubes
metamorphosis includes _ stages
4
incomplete metamorphosis includes _ stages
3
metamorphosis is
egg, larvae,pupa, adult
incomplete metamorphosis is
egg, nymph, adult
blood fluid in arthropods is called
hemolymph
spiders, ticks, mites, scorpions, and horshoe crabs are examples of what subphylum?
cheliceriforms
millipedes and centipedes belong to what subphylum?
myripoda
insects belong to what subphylum?
hexapoda
barnacles are in what subphylum?
crustaceans
Echinoderms are _______ and ___________
chordates and deuterostome
examples of echinoderms are
sea stars, sea cucumbers and sea urchins
a network of hydraulic canals branching inot tube feet that function in locomotion feed and gas exchange is what?
water vascular system