Invertebrates Flashcards
T/F most knows species are invertabrate
True
Which are always protosomes
Acoelomates and psuedocoelomates
What can be protosome or dueterosome
Coelomates
What phylum are sponges in
porifera
what are features of sponges differentiated than that for other animals
They lack true tissue
They lack organs
Body plan of Cnidarians
Diploblastic
Radial symmetry
What are the 4 classes of cnidarians
Hydrozoa
scyphozoa
cubozoa
anthozoa
How is body plan of cnidarian basic.
They are a sac with a gastrovascular cavity
Two body type variations of cnidarians
Polyp
medusa
How is polyp distinguished from medusa
Mouth is facing up
What is the prevalent form of Syphozoa
Medusa
Example of Hyrdozoa
Colonial polyps
Example of scyphozoa
Jelly fish
Example of Cubozoa
Box jellies
Sea wasp
Example of anthozoa
sea anemone
Significant trait of cubozoa
Complex eyes
What form stage are anemones and corals found in
polyp
What type of tissue are bilaterians
Triploblastic
Organisms in Lophotrochozoa
Flat worms, rotifers, ectoprocts, barchiopods, molluscs and annelids.
How is Lophotrochozoa grouped together
Molecular data
What phylum are flatworms in
Platyhelminthes
What Type of body tissue do flatworms have
Triploblastic
T/F Flatworms are coelomates
False
they are Acoelomates
T/F Flatworms have a gastrovascular cavity
True
Phylum for Rotifers
Rotifera
Habitat for rotifers
Fresh and ocean water
Damp soil
T/F Rotifers are smaller than protists AND are multicellular
True
T/F rotifers do not have specialized organ systems
False
T/F rotivers have teeth
False,
Mouth contains cillia
Define Alimentary canal
digestive tube with mouth at one end and anus at the other floating in a pseudocoelom
How do rotifers Reproduce
There are no males,
Females produce offspring from unfertilized eggs
New name for rotifers
Syndermata
Examples of molluscs
Chitons, snails, oysters, squids
chitons
8 segmented body
T/F Gastropods are a diverse gorup
True
3/4 of all species
Define: Torsion
When the anus ends up by the neck. Gastropods
Examples of Molluscs: Class Bivalvia
Clams, oysters, mussels, scallops
What is significant about bivalvia
THey are suspension feeders
Examples of Molluscs: Class Cephalopoda
Squids, octopuses, carnivores.
What are Nautiloidea (ammonites)
Ancient cephalopods
T/F Nautiloids have been found atop utah mountains
true
Identifying feature of Annelids
bodies made of fused rings
Three groups in annelids
Oligochaeta
Polychaeta
hirudinea
Significant feature of Oligochaetes
Have sparse chaetae bristles made of chitin
Polychaetes
Contain paddle like parapodia that work for gills and movement
Class of Leeches
Hirudinea - blood sucking parasites
Secrete hirudin to prevent coagulation
Define Chaetae
bristle made of chitin
Groups of Ecdysozoans
Nematodes
arthropods
Significant structure of Ecdysozoans
Cuticle covering body that is molted
Nematods are:
Predetors that are largely parasites
T/F Anthropods are a diverse group.
T
2/3 of known species
Body plan of anthropods
segmented exoskeleton w/ jointed appendages
Early there wasn’t differentiation between segments
Four subphyla of anthropods
Cheliceriformes (Arachnida)
Myriapoda (millipedes)
Hexapod (insects)
Crustacea (crabs etc.)
Significance of hox genes in anthropods
decrease in number of segments and increase in appendage specialization
What as promoted with Jointed appendages
fitness
Significant structures of millipedes
Oldest with jaws
2 legs per “trunk” believed to be the first to make it to land
T/F Hexapods were the first to develop wings
True
Why did Hexapods “shrink”
as available oxygen declined, circulatory systems needed to be smaller
Features of crustacians
Jointed appendages for locomotion and feeding. Have two antenna
Common Echinoderms
Starfish
T/F echinoderms are closest relative to Chordates
True
Shared Characteristic of echinoderm and chordates
Dueterstome
Mouth develops at the opposite end of blastopore
Triploblastic
Endoskeleton Features of echinoderms
Thin layer of epidermis
Hard/ calcium carbonate
T/F Echinoderm nervous system has a brain and head
Fasle,
Nervous system exists but no brain and head is present
T/F Initial development of echinoderms is bilateral
True
