Phylum Annelida
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Transcript of Phylum Annelida
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Phylum AnnelidaKaitlyn Anticoli and Madeline Avallon
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Phylum Classes1. Polychaeta Class
2. Aelosomata Class3. Clitellata Class (superclass)
a. Oligochaeta Subclass
b. Branchiobdella Subclass
c. Hirundinea Subclass
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Basic Characteristics● annelid means "little
rings" ● distinguished by
segmentation and body cavity
● range in length from 1 mm- 3 m
● bilaterally symmetrical
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Basic Characteristics● digestive tract● ability to survive in
most environments● possesses 3
separate sections: prosomium (mouth), trunk and pygidium (tail)
● cephalopods
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Skeletal System● coelum: fluid-filled cavity that separates gut
from body wall● hydrostatic skeleton
○ coelum which creates hydrostatic pressure and acts as a hydrostatic skeleton
○ most primitive skeletal system
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Circulatory System● true closed circulatory system● two main vessels are
○ dorsal blood vessel: blood moves anteriorly
○ ventral blood vessel: blood moves posteriorly
● aortic arches: "hearts"○ dark, expanded structures on either side
of the esophagus○ only function in pumping blood from the
dorsal to the ventral vessels
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Digestive and Excretion System● annelids break down organic material to
create rich soil● have a mouth that connects directly to the
anus without an intermediate stomach○ allows annelids to continuously eat and
excrete waste as they burrow down through the soil
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Reproductive System● normally sexual● gonochoristic or hermaphroditic● asexual reproduction: part of their tail is
released which grows into a new organism (fission)
● sexual reproduction: fluids are transferred from the male pore to the female ovipore.
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Nervous System● primitive brain (ganglionic mass) connected
by a ring of nerves to a ventral nerve cord that runs the length of the body
● sense organs include eyes, taste buds, tactile tentacles, and organs of equilibrium called statocysts.
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Evolved Characteristics● humans, like annelids, have a brain and
nerve cord (spinal cord)● frogs have a coelum
○ annelid coelum contains fluid that creates pressure and acts as hydrostatic skeleton
○ frog's coelum contains organs such as the lungs and is where lymph cirulates
● anthropods like insects are also segmented
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Sea Mouse● short, broad, segmented body, ● found in moderately deep water● dorsal surface has 15 pairs of raised scales
○ the space between the scales and the body surface forms a channel for the flow of water carrying oxygen
● 6 to 8 in. long and 2 in. wide
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Giant Feather Duster● marine segmented worms ● attached to rocks or sand● from 1/2 to 10 inches long● Encased in a translucent tan tube made of
protein and filtered particles● about 30 feather-like gills (radioles ) on each side of
their tube for respiration and feeding● covered in eyespots to know when danger is near to
retreat into their tube● live in groups in tide pools or near the low-tide line● feed on small particles and plankton floating in the water
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Leeches● cylindrical or slightly flattened body with
suckers at either end for attaching to prey.● salivary secretions substances that promote
blood flow like hirudin● can be small enough to enter human body or
as big as adult human forearm ● do not feed vey often
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Giant Australian Earthworm● largest is 13 feet long!● need water so rarely leave moist
underground● lay eggs that take year to develop● endangered because can't handle human
interaction/pesticides etc.● annual worm festival with Earthworm Queen
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Colonial Polyps ● one-way digestive tract● prefer mild flow environments but benefit
from occasional stronger water flow● round with a mouth in the middle and a ring
of tentacles around the mouth● tentacles possess cells that sting, paralyze,
and catch prey
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King Ragworm● prefer estuarine environment with mud● can grow to 24 inches● sharp teeth that grab and hold onto prey● locomotory feet
○ aid swimming○ circulate water○ bring food to worm
● predator