Metamerism & Tagmatization

Phylum Arthropoda Pt. I Arthropoda Phylogeny Miller and Harley Chap. 14

Fig. 14.2

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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

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Arthropod Exoskeleton Modifications & Articulations

Fig. 14.4 Fig. 14.3

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1 Ecdysis Ecdysis

Fig. 14.5 Fig. 14.5

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Ecdysis Spider Molting

Fig. 14.5

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Crab Molting Class Merostomata

Fig. 14.8

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2 Class Arachnida Book Lung Order Aranea

Fig. 14.12 Fig. 14.9

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Excretion Sense Organs Fig. 28.13 & 28.14

Fig. 14.10 & 14.13

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Venomous Spiders Brown Recluse Haemolytic Venom

Black Widow Brown Recluse

Fig. 14.14

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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

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Next Class – Arthropoda Pt. II

Miller and Harley Chap. 15

BIO2135 – Animal Form and Function