BIOL 2030 Chapter Notes - Chapter 4: Loligo, Cecum, Ink Sac

• School: York University
• Department: Biology
• Course: BIOL 2030
• Professor: Andrew Donini

Document Summary

O testis(smaller in diameter then the vas deferens: vas deferens. Anterior tentacles are shorter then posterior (cid:120) identify: (cid:190) foot (cid:190) head bearing with 2 pairs of tentacles (cid:190) pulmonary pore (pneumostome) (cid:190) anus (cid:190) ventral mouth (cid:190) pedal mucous gland opening. Shorter rounded end of the shell is anterior. Digs into mud with its for; in situ. Consists of three layers: (cid:131) periostracum: thick horny layer (cid:131) prismatic (cid:131) nacreous (innermost, mother of pearl ) (cid:120) Internal anatomy: (cid:120) identify: (cid:190) mantle (cid:190) muscular foot (cid:190) excurrent siphon (cid:190) anus (cid:190) pericardial cavity (cid:190) heart (consist of one ventricle and 2 auricles) (cid:190) rectum (passes through heart) (cid:190) intestine (cid:190) stomach (cid:190) kidneys (dark brown) Dorsal end is where the foot is. Muscular foot is modified into 5 pairs of arms: four are same length with suckers and one is a tentacle which is longer (cid:131) tentacles used to catch prey (cid:131)