Unit 3 Flashcards
Compare/Contrast the cleavage pattern of a protostome and a deuterostome
Protostome: Spiral Cleavage
Deuterostome: Radial Cleavage
Compare/Contrast the cell fate of a protostome and a deuterostome
Protostome: Determinate developement (cell fate set very early on)
Deuterostome: Inderterminate developement (cell fate is not set until later on)
Compare/Contrast blastopores for protostomes and deuterostomes
Protostome: The blastopore (depression) becomes the mouth, forming mouth to anus
Deuterostome: The blastopore (depression) becomes the anus, forming anus to mouth
Compare/Contrast the coelom formation in protostomes and deuterostomes
Protostome: Schizocoelous- Body cavity is formed when a tissue splits open and a new space is created
Deuterostomes: Enterocoelous; Body cavity is a pocket (bubble) that develops from a digestive tract.
Label this Scyphozoan medusa
Fill in the blanks
Lophotrocozoa are a clade that makes up which Phyla
Phylum Mollusca
Phylum Annelida
Phylum Platyhelminthes
Ecdysozoa is a clade that make up which Phyla
Phylum Arthropoda
Phylum Nematoda
Define and differentiate the terms acoelomate, psuedocoelomate and eucoelomate
All three are triploblastic with ectoderm,mesoderm and endoderm but they body cavities are different
Acoelomate - Organism has no true body cavity
Psuedocoelomate - Organism has false body cavity; body cavity is present but it doesnt arise from the mesoderm
Eucoelomate - Organism has true body cavitie that arrises from the mesoderm
Describe the difference between a complete digestive system and an incomplete one
In an incomplete digestive system there is only one opening that leads to a GVC. The organism can ingestive food but has to digest and expell the waste before it can take in another meal.
In a complete digestive system there are two openings that form a mouth—>anus digestive tract and the organism can continuously feed
An organism that possess both male and female reproductive organs
Monoecious
Organisms that only possess either male or female reproductive organs; two different body forms for male and female
Dioecious
Are organisms from Class Turbellaria free-living or parasitic
Free-living
Are organisms from Class Trematoda free-living or parasitic
parasitic
Are organisms from Class Monogenea free-living or parasitic
parasitic
Are organisms from Class Cestoda free-living or parasitic
parasitic
Platyhelminthes that possess a GVC (blind gut) belongs to what Class
Turbellaria
Identify this orgnaism and the Phylum and Class it belongs to
Label the parts
Phylum Platyhelminthes
Class Turbellaria
Dugesia
Label the parts of this typical flatworm
Identify this organism in cross section and label the parts
Dugesia
Describe the life cycle of the Clonorchis (liver fluke)
Identify this organism and the Phylum and Class it belongs to
Label the parts
Phylum Platyhelminthes
Class Trematoda
Clonorchis
Label this proglottid and identify what organism this structure comes from
Taenia
Class Cestoda
Distinguish between these different structures on a Taenia
Define eutely
It means that every organism possess the same number of cells
Some Gastropods exhibit a rotation of their organs 90 and 180 degrees giving them an asymmetrical body. This is known as ____________
Torsion
A molluscan that has one shell
univalve
A molluscan that has two shells
Bivalve
When a molluscan shell spiral is on one plane
planospiral
When a molluscan shell spirals into a cone shape
Conispiral
Explain right handed and left handed in gastropods
Right handed means the shell grows (spirals) to the right; Dextral
Left handed means the shell grows (spirals) to the left; Sinistral
Are gastropods univalves or bivalves
Univalves
(when shell is present)
List and describe the different layers of a bivalve shell
Periostracum - rough outer layer of the shell
Prismatic layer - middle layer of the shell
Nacreous layer - smooth inner layer of the shell that is continuously secreted by the mantle
The first segment on an annilid is called the __________
Prostomium
The last segment on an annilida is called the __________
pygidium
Identify the Phylum and Class of the organism pictured
Phylum Mollusca
Class Polyplacophora
Identify the Phylum and Class of the organism pictured
Phylum Mollusca
Class Bivalvia
Identify the Phylum and Class of the organism pictured
Phylum Mollusca
Class Gastropoda
Identify the Phylum and Class of the organism pictured
Phylum Mollusca
Calss Cephalopoda
Identify the Phylum and Class of the organism pictured
Phylum Mollusca
Class Scaphopoda
Are members of Class Scaphopoda univalves or bivalves
Univalves that are open at both ends
How do members of Class scaphopoda respire
They do not have gills; respiration occurs directly across the mantle
Do members of Calss Scaphopoda have tentacles
Yes but they are modified to form a captaculum (ciliated adhesive knobs at the ends of the tenticles) that sweeps through the sediment
What type of larva can be found in Class Scaphopoda
Trocophore larva
Are members of Class Scaphopoda monoecious or dioecious
Dioecious
What type of circulatory system is present in Class Cephalopoda
Closed circulatory system
Secreted as a defense mechanism; found in Cephalopods
Sepia (melanine pigment)
Special cells that allow cephalopods to alter their appearance
Chromatophores
Members of this Calss of molluscs exhibit complex behaviors, especially in prey capture and mate selection
Cephalopoda
Modified radula found in cephalopods
Beak
Do cephalopods have shells
shells are either modified (reduced) or absent in this class
Do bivalves have an open or closed circulatory system
It is an open circulatory system becase the blood is not always contained within vessels
This defining feature of gastropods is a tongue shaped structure that is used for feeding
Radula
What structure is indicated at the tip of the pointer
Heart
Label structures A and B
A. Foot
B. Gills
