BIOL 1030 Lecture Notes - Lecture 4: Gastrovascular Cavity, Ascaris, Paraphyly

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Kevin G.Scott

Document Summary

Molluscan clade gastropoda (1 piece shell, usually spiral) the snails and slugs. Molluscan clade bivalvia - (2 shells/shell in 2 pieces that is hinged) the clams, scallops, mussels, etc. Molluscan clade polyplacophora (have many pieces to their shell) the chitons (8 pieces, making them flexible) Molluscan clade cephalopoda the cuttlefish, squid and octopi. Phylum annelida the segmented worms repeating body segments trochophore larval stage. Annelid clade errantia actively mobile, segmented worms ( explorers : covered in appendages, parapodia (used to swim/walk) and palps (for sensation) Annelid clade sedentaria less active, segmented worms ( stay at home ) tubeworms, earthworms and leeches (move really slow) Phylum brachiopoda the lamp shells lophophore covered with cilia symmetry is vertical (dorsal and ventral) 1 muscle to open and 1 to close. Not clams: different place of symmetry cuts are different, they are horizontal (left and right, different musculature, 1 muscle to open and close. Developmental patterns the 2nd opening becomes the mouth.