jimtrue.com : school : BSC2011L : Lab 07: Animalia II: Invertebrate Annelida and Arthropoda

Posted by Jim True on October 19, 2004 2:33 PM. Last Updated October 22, 2006 9:23 PM

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Lab 07: Animalia II: Invertebrate Annelida and Arthropoda

Phylum Annelida (worm group)

• Body construction and modifications on that theme; up until this point body type has been entire. Advantage for organisms that burrow, serial repetition of body parts, metamerism.
• Only a few segments have to contract to move the body.
• Earthworms are simulataneous hermaphrodites, but they are not self-fertilizing (worms lay side by side and sperm from seminal vesicle transfers to seminal receptacle of opposing worm. As the worm moves, the clitellum forms around the bare segment and eggs are deposited in the clitellum and the sperm from the receptacle moves down and fertilizes the eggs.

Phylum Arthropoda (most diverse), huge phylum, over 1 million are arthropods; insecta is the largest class.
Open circulatory system
blood filled cavity, hemocoel
tagmatization
exoskeleton of chitin
mouth parts formed of chitin
appendages highly jointed and highly modified

Four SubPhyla:

SP.Trilobita (every body form has two longitudinal furrows that divides into three segments)
SP.Chelicerata - feeding parts (chelicerae), spiders, scorpions, horseshoe crabs, ticks, mites
diagnostic:
no antennae
appendages 3-4 used for walking, uniramous (one appendage off the base)

SP Crustacea - diagnostic, mandibles, not chelicerae
biramous appendages
two antennae
thoracic appendages (walking)

Antennae, thoracic appendages,

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