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
-has unique cells that function in defense and thr capture of prey
-some are stingling cells called nematocysts
-some are merely there to entagle the prey and bring it to the tentacles
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?
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?
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)
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
colonial animals that superficially resemble plants
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
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
oval shaped marine animals encased in an armor of eight dorsal plates. Use foot to more and suction to rock radula to ingest algae
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
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