Mammals 4,629 species Phylum Chordata "back-boned animals" Four Distinct Features.
Phylum Chordata 1 Tunicates Amphioxus. Phylum Chordata 2 Included are 48,000 species the majority of...
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Transcript of Phylum Chordata 1 Tunicates Amphioxus. Phylum Chordata 2 Included are 48,000 species the majority of...
Phylum Chordata3
Taxonomic Summary
Phylum Chordata– Subphylum Urochordata– Subphylum Cephalochordata– Subphylum Vertebrata
Phylum Chordata4
Subphylum Urochordata
Defining characteristics– Notochord and nerve
cord are found only in the larval stage
Most of the urochordates are filter feeders
Phylum Chordata6
Nice Tunic
Soft exoskeleton made of cellulose with 2 external openings
Some species have spicules and toxins in the tunicate Spicules
Phylum Chordata8
Sexual Reproduction
Most colonial species retain eggs and fertilization is internal with development
The larvae are microscopic, short-lived, non-feeding, pelagic tadpoles
Phylum Chordata9
Subphylum Cephalochordata
Defining characteristics
– The notochord extends beyond the nerve cord to the anterior end of the animal
– The notochord is contractile, formed as a longitudinal series of
flattened discs
Phylum Chordata10
A Little Ditty
It’s a long way from amphioxus,
It’s a long way to us
It’s a long way from amphioxus
To the meanest human cuss
Goodbye to tails and gill slits,
Hello: nails and hair!
It’s a long way from amphioxus
But we came from there
Phillip H. Pope sing to the tune of “It’s a long way to Tipperary”
Phylum Chordata13
Filter Feeders
Filter feed using a special pharynx similar to tunicates
Slotted pharynx supported by skeletal bars similar to acorn worms