BIO 2135 Lecture Notes - Lecture 11: Seminal Vesicle, Bivalvia, Jab
Document Summary
1st didn"t have shell, spicules clam as a representative: bivalves: Filters particulate matter out of water from incurrent siphon. Organism suspended in mantle cavity inside of shell. Posterior adducter muscle: abducter always moves away from body, so adducter moves toward and closes the shell! If doesn;t open when cooked, clam was dead before it was harvested. Hinge and teeth to ensure it lines up right clam anatomy: Lost the radula (an autapomorphy for the phyllum! Squid are actually lower on tree, because they retain the ancestral characteristics. Intestine winds through foot and opasses trough pericardial cavity. Heart in pericardial cavity, pumps blood out to ant and post ends. Openening to funel (metanephridia), gonads release gametes into cavity to get to outside. Intestine and pericardial dump into excurrent flow circulatory system. Blood pools in thin walled atrium b/f heart. Nitrogenous waste moves from atrium to pericardial cavity, Atrium is 1, artery from ventricles, but no capillaries!
