earloracion15-
A welldeveloped circulatory system and complete digestive trac
characteristic feature of higher metazoans
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Coelom
body cavity between intestinal wall and body wall
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Somites
Bodies composed of series of ring-like segments
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Setae
Many annelids have chitinous bristles or hair-like structures called
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movement, anchorage, deter predators
uses of setae
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Polychaeta and Clitellata
class of Annelida
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Parapodium
function as gills and aid in locomotion.
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Polychaeta
has many setae
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Sandworm, Bispira, Chloea
examples of Polychaeta
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Clitellum
pronounced cylindrical glandular regions of the body
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Class Clitellata
has permanent gonads
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Oligochaeta (earthworms) and Hirudinae (Leeches)
subclass of Clitellata
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Annuli
Secondary subdivisions found in segment in SC Hirudinae
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34 segments
number of segments of Leeches
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only appears during breeding season), like oligochaetes
clitellum of Hirudinae
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Phylum Mollusca
Eucoelomate • Well-developed circulatory system and a complete muscular digestive tract • Soft-bodied animals that are usually protected with hard shells made up of calcium carbonate • Internal shells or none at all • Triploblastic, non-segmented, usually dioecious • includes snails and slugs, oysters and clams, and octopuses and squids.
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Visceral mass
containing digestive, circulatory, respiratory and reproductive organs.
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Mantle
houses the gills and in some secretes a protective shell over the visceral mass
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Muscular foot, visceral mass, mantle
3 body plans that Mollusc have
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Class Aplacophora
Solenogasters • Worm-like • Live in deep ocean bottoms • Poorly developed head • Lacks mantle, foot, and shell
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Neomenia
example of class Aplacophora
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Class Monoplacophora
Single cap-like shell • Broad flat foot • Dioecious
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Neoplina
example of class Monoplacophora
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Polyplacophora
“Chitons” • Elongated with dorso-ventrally flattened body • Head with armor-like eight-plated shell
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Radula
to scrape algae off rocks
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Ctenidia
gills for breathing
