Lab 2

• What is an ammocoete?

  Larval lamprey
• What is a larval lamprey called?

  Ammocoete
• What is an amphioxus?

  Larval lancet
• What is a larval lancet called?

  Amphioxus
• What is a larval invertebrate chordate called?

  tadpole
• What does a tadpole of an invertebrate grow into?

  Urochordate
• Pharyngeal slits are present early within protochordates. Upon reaching the prechordate, other chordate characteristics would be present--notochord, postanal tail, dorsal hollow nerve chord-all serving a more active lifestyle.
• Pharyngeal slits are present early within protochordates. Upon reaching the prechordate, other chordate characteristics would be present -- notochord, postanal tail, dorsal hollow nerve chord -- all serving a more active lifestyle.
• Echinoderms: a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber that are  characterized by a hard, spiny covering or skin. 
• Hemichordates: any of a group of wormlike marine invertebrates closely related to both chordates and echinoderms and usually considered to constitute a phylum, the Hemichordata; an acorn worm
• Cephalochordates: any of more than two dozen species belonging to the subphylum Cephalochordata of the phylum Chordata. Small, fishlike marine invertebrates, they probably are the closest living relatives of the vertebrates; includes lancelets
• Urochordates: Urochordata are a group of chordates that have a notochord; includes tunicates and sea squirts
• Notochord: a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
• Dorsal Nerve Chord:  the single, hollow, fluid-filled, dorsal tract of nervous tissue that is one of the defining characteristics of chordates and develops into the spinal cord and brain of vertebrates;
• Myomeres: blocks of skeletal muscle tissue arranged in sequence, commonly found in aquatic chordates (Typically in a V or W shape)