Lab 6 - Annelida Flashcards
what is the main feature of Phylum Annelida?
metamerism
metamerism
repeated body segments
homonomous metamerism
body segments are more or less the same
heteronomous metamerism
segments are different
annuli
outer rings that separate metameres, external evidence of septa
metameres internally separated by _____
septa
septa
thin layers of tissue in which organs/nerves can pass through
incomplete septa
leave an open space in the middle
complete septa
completely seal off metameres
What classes do you need to know for Phylum Annelida? (2)
Classes Polychaeta and Class Clitellata
Class Polychaeta has what kinds of organisms? (2)
sandworms and marine worms
where can members of Class Polychaete found?
mostly marine species
Phylum Annelida
Are members of Class Polychaeta monoecious or dioecious?
mostly monoecious with some dioecious species
what kind of septa does Class Polychaeta have?
incomplete septa
what kind of development Class Polychaeta display?
indirect development - trochophore larva
Annelida
parapodia
feet like body extensions with setae
setae
bristles
what are parapodia for?
aid in locomotion and increase surface area for gas exchange
acicula
larger support spikes for parapodia
What Class does Subclass Oligochaeta belong to?
Class Clitellata
Phylum Annelida
where are members of Subclass Oligochaeta? (3)
includes earthworms, with some aquatic and marine species
clitellum
secretes a mucus sheath to enclose fertilized eggs as they are released
What kind of development does Subclass Oligochaeta display?
direct development
what kind of septa does Subclass Oligochaeta exhibit?
complete septa
describe the path of the digestion for Subclass Oligochaeta. (4)
esophagus -> crop ->gizzard -> intestine
how many setae does Subclass Oligochaeta have?
few on the ventral surface
what kinds of organisms are in Subclass Hirudinea? (2)
leeches, ectoparasites
what class does Subclass Hirudinea belong to?
Class Clitellata
are members of Subclass Hirudinea monoecious or dioecious?
monoecious
do members of Subclass Hirudinea have setae?
no setae
what kind of development do members of Subclass Hirudinea undero?
direct development
what kind of septa does Subclass Hirudinea have? (2)
no internal septa, but they do have annuli
what feature do members of Subclass Hirudinea exhibit when reproductive?
clitellum
Hirudinea: small anterior sucker
with a mouth for attachment and feeding
Hirudinea: large posterior sucker
mainly for locomotion but also attachment
What features of Class Polychaeta would lead you to believe that they are free-living predators? (4)
- parapodia used in locomotion
- fangs for capturing and subduing prey
- no structures for attaching to host
- sensory structures on the head
Whats the function of acicula in Polychaetes?
structural support for the setae and parapodia
Body undulations, which help the Polychaete worms move rapidly, are produced by what muscles (if any)? (2)
- accomplished by circular, longitudinal, and parapodia muscles and coelomic fluid
- produced by the contraction of longitudinal muscles stimulated by the backward stroke of parapodium of a particular segment
What is the correct order in which food passes through the earthworm? (7)
- mouth
- pharynx
- esophagus
- crop
- gizzard
- intestine
- anus
What anatomical similarities do you see among leeches, earthworms, and sandworms? (2)
- a complete digestive system
- repeated internal structures like nephridia, reproductive structures, and hearts
Which os the following is a trait that Platyhelminthes and Annelida share that is not found in Cnidaria?
triploblastic development
What is the two major distinguishing features of Annelida?
coelom and metamerism
Why must terrestrial annelids such as earthworms maintain a moist skin surface?
to allow gas exchange to occur across the epidermis
what taxa does the common earthworm belong to?
Subclass Oligochaeta
what taxa do sandworms belong to?
Class Polychaeta
what taxa do leeches belong to?
Subclass Hirudinea
what taxa are free-living freshwater or terrestrial worms with setae?
Subclass Oligochaeta
Phylum Annelida, Class Clitellata
what taxa are ectoparasites with suckers for feeding and lack setae and parapodia?
Subclass Hirudinea
what taxa are marine worms with parepodia?
Class Polychaeta
What is structure A?
longitudinal muscles
what is structure B?
ventral nerve cord
what is structure C?
circular muscle
what structures are line D?
acicula
what is structure E?
parapodium
What Phylum and Subclass does this specimen belong to?
Annelida, Oligochaeta
what is the function of A?
reproduction, stores sperm until needed
what system does C belong to?
circulatory system
Fully name these specimen.
Phylum Annelida
Class Polychaeta
What are these specimen?
Phylum Annelida
Class Polychaeta
What are these specimen?
Phylum Annelida
Class Clitellata
Subclass Oligochaeta
What are these specimen?
Phylum Annelida
Class Clitellata
subclass Hirudinea
What is this specimen?
a c.s. of Neresi from Class Polychaeta
what is Annelida development? (3)
triploblastic, eucoelomate, and protostomes
What kind of circulation does Phylum Annelida have?
a closed circulatory system
what do parapodia assist with? (2)
locomotion and gas exchange