A introduction to invertebrates

sessile and have porous body and choanocytes


suspension feeders- capture food particles that are suspended in the water


sponges belong to what phylum?


Porifera's live mostly at?

live in both, fresh and marine waters

most sponges has individual functions as both males and females,
which is called?


choanocytes, amorbocytes belongs to?


which animals are radially symmetric?


all animals with true tissues belongs to the phylum of?


the basic body plan of Cnidarians can be describe as?

a sac with a central digestive compartment, the gastrovascular cavity

Cnidarians has a single openning which is describe as?

mouth and anus

their body plan has two variation

floating medusa and sessile polyp

cnidarians eat? are...?

carnivores (use testicles to capture the prey)

cnidarians tenticles descriptions


Cnidarians have 4 major classes which are?

Cubozoa (box jellies, sea wasps) Anthozoa (sea
anemones, most corals, sea fans) Hydrozoa (portuguese
man-of-war, hydra, Obelia, some corals) Scyphozoa (jellies,
sea nettles)

in the class of scyphozoa are the?

jellies (medusa) are the prevalent form of the life cycle

in the class of cubazoa are what type of animals?

box jellies and sea wasps (medusa is box- shaped and has complex eyes)

in the anthozoa are which animals?

the corals and sea anemones (which occur only as polyps)

lophotrochozoans are which type of animals?

bilateral animals

clade of bilateral can be describe as

of animals that conists of bilateral symmetry and tripploblastic development

clade of lochotrochozoa are

some develop a lophophore for feeding, others pass through a
trochophore larva stage, and a few have neither feature

flatworms, rotifers, ectoprocts, brachiopods, molluscs, and annelids
falls under the clade of?


flatworms are which phylum?


flatworms are

flattened dorsoventrally and have a gastrovascular cavity

flatworms live in

marine, freshwater and damp terrestrial habitats

Platyhelminthes phylum (flatworms) have 4 major classes which are ?

Monogenea (monogeneans) Turbellaria (mostlye free
living flatworm, such as Dugesia) Cestoda (tapeworms)
Trematoda (trematodes)

turbellaria class

morslty marine, turbellarians called PLANARIANS, have light sensitive
eyespots and centralized nerve nets

parasites in or on other animals are that are flatworms are named?

Monogeneans and Trematodes, parasitize a wide range if hosts.
Trematodes parasites many different kinds of animals. (Shistosoma is a
parasite). Poduce proteins that mimic their host. Most monogeneans
(parasite in fish).


parasitic living mostly in vertebrates.
Don't have digestive system.


small but have special organ systems acts as a digestive tube with a
mouth and anus and a pseudocoelom. Reproduce by parthengenesis
(produce more females from unfertilized eggs)

Lophophorates has three phyla

Ectoprocts, Phoronids, and brachiopods

lophophorates have a ?

-horsesoe- shaped, suspension- feeding organ bearing ciliated tentacles
-cilia bring water towards the mouth and tentacles trap the food
-also have a u-shaped alimentary canal and the absence of a distinct head
-have a true coelom

ectoprocts are?

colonial animals that superficially resemble plants

Phoronoids are?

tube dwelling marine worms


lamp shells, dorsal and ventral halves rather than lateral like in clams


snails, slugs, oysters, clams, octupuses and squids. Most are marine
and some are terrestrial. Soft bodies animals, but most are protected
by a hard shell of calcium

muscular foot is for


visceral mass

containts most of the internal organs


the tissue that drapes over the visceral mass and secretes the shell

mollusks feed by

using a rasping oergan called a RADULA to scrape up food

molluscs have separate sexes with gonads located

in the visceral mass, but many snaeils are hermaphrodites

molluscs life cycle includes

a ciliated larva stage called a TROCHOPHORE

Mollusks have 4 major classes

bivalvia )clams, mussle, scallops, oysters)
cephalopoda (squids, ocyopuses, cuttlefish, chambered
nautiluses) gastropodsa (snail, slugs)
polyplacophora (chitons)

chiton belongs to the phylum of


chitons are

oval shaped marine animals encased in an armor of eight dorsal
plates. Use foot to more and suction to rock radula to ingest algae

gastropods are

snails and slugs. marine, freshwater, and terrestrial. Possess a
single spiraled shell or have a reduced shell.

gastropods have a distinctive characteristic called

torsion- which cause the animals anus and mantle to end up above its head


have a shel divided into two halves.
no distinct head
some have eyes and sensory tentacles
suspension feeder

bivalves use what to feed

they contains and use gills that are used for feeding as well as gas exchange

cepholopoda incluedes squirds and octopuses

incluedes squirds and octopuses.
Most octopuses�Creep along the sea floor in search of prey
�Squids use their siphon�To fire a jet of water, which allows them
to swim very quickly
�One small group of shelled cephalopods�The nautiluses, survives today


are the only mollusks with closed circulatory system.
developed sense organs and complex brain