Phylum Arthropoda Pt. I Arthropoda Phylogeny Miller and Harley Chap. 14 Fig. 14.2 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Arthropoda Taxonomy Metamerism & Tagmatization ● Sub-phylum Trilobitomorpha – Marine, all extinct, 3 longitudinal lobes ● Sub-phylum Chelicerata – 2 tagma (prosoma & opisthosoma), 1st pair of appendages modified into feeding chelicera ● Sub-phylum Myriapoda – Body divided into head and trunk, 4 pairs of head appendages, uniramous appendages ● Sub-phylum Crustacea – Mostly aquatic, head with 2 pairs of antennae, one pair of mandibles, 2 pairs of maxillae, biramous appendages ● Sub-phylum Hexapoda – Body divided into head, thorax and abdomen; 5 pairs of appendages on head, 3 pairs uniramous appendages on thorax only BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Arthropod Exoskeleton Modifications & Articulations Fig. 14.4 Fig. 14.3 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function 1 Ecdysis Ecdysis Fig. 14.5 Fig. 14.5 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Ecdysis Spider Molting Fig. 14.5 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Crab Molting Class Merostomata Fig. 14.8 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function 2 Class Arachnida Book Lung Order Aranea Fig. 14.12 Fig. 14.9 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Excretion Sense Organs Fig. 28.13 & 28.14 Fig. 14.10 & 14.13 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Venomous Spiders Brown Recluse Haemolytic Venom Black Widow Brown Recluse Fig. 14.14 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function 3 Class Arachnida Class Arachnida Order Scorpionida Order Acarina Fig. 14.11 Fig. 14.17 BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Sub-Phylum Myriapoda Sub-Phylum Myriapoda Class Chilopoda Class Diplopoda Fig. 14.9 Fig. 14.9 Antenna Eye Collum Eye 1st Maxilla Antenna 2nd Maxilla Mandible Maxilla Maxillipede (Venom Gland) 1st Leg BIO2135 – Animal Form and Function BIO2135 – Animal Form and Function Next Class – Arthropoda Pt. II Miller and Harley Chap. 15 BIO2135 – Animal Form and Function 4.