BIOL 2030 Lecture Notes - Lecture 12: Trilobite, Subphylum, Cephalon
17 Sep 2015
School
Department
Course
Professor
Document Summary
16 500: there are 5 subphylum but only 4 currently living, subphylum crustacea (~ 6%, subphylum chelicerata (~5. 5%, subphylum myriapoda (~1%, subphylum hexapoda (~87. 5%) Most dominant insects: subphylum trilobita (521 million years ago 250 mya) Thorax used for locomotion or flight: 3. Pygidium (posterior region: axial lobe, right pleural lobe, left pleural lobe, the name trilobite means three lobed . Subphylum chelicerata head & thorax merged = cephalothorax: has 3 classes, 1. Only ~ 5 species one spp in eastern seaboard of north america, the rest found in asia. Don"t see a metameric features on dorsal side, but see it on ventral side. Shallow water creatures: only time that they come out of water is when the female is laying fertilized eggs in soft sand. Can range in size (small very big) Their blood is used in pharmaceutical industries to test for endotoxicity.
