Artrhopoda I Oct 26

Artrhopoda I Oct 26 - 1 Phylum Phylum Arthropoda Arthropoda...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Phylum Phylum Arthropoda Arthropoda Triploblastic Triploblastic Coelomate Coelomate Protostomes greatest # species described huge diversity of life styles, body structures, and morphologies Taxonomy in constant flux, confusing large number of subphyla, classes, etc. here it is important to know TAXA, HIERARCHY OF TAXA, rather than taxonomy (names of level) Current view from the Tree Of Life Project We will use the following heirarchy & You need to know these taxa: Phylum Arthropoda Trilobitomorpha Cheliceraformes Chelicerata Xiphosura Arachnida Pycnogonida Crustacea ~10 Major Taxa Hexapoda Insecta Myriapoda First - General features of arthropods Contrasts with Annelida - the other phylum with segmentation Then - Details of groups and deviations from general arthropod plan Exoskeleton Exoskeleton hardened cuticle with chitin, tanned proteins, CaCO 3 Covers entire body including anterior and posterior gut, gastric mill, etc. 2 Cuticle/Exoskeleton Secreted by epidermis 2 layers- Epicuticle: Cuticulin, lipid, wax- Procuticle: 2 layers both with chitin- Exocuticle: solerotized- Endocuticle: can be calcified Functions: Protective Rigid exoskeleton - antagonize muscles Crushing/Chewing Sensory Setae (extensions of cuticles) Line air passages (reduce water loss) Line foregut and hind gut grinding in gut Muscle attachment - APODEMES Multilayered Complex hormone regulation of molting Must Molt to grow Jointed appendages Jointed appendages Flexible joints Flexible joints body parts that move Hard skeleton requires Jointed appendages Flexible joints body parts that move Articulations allow movement of jointed appendages Apodemes at joints - muscle attachment 3 Segmented Segmented Paired Appendages in each segment ventral nerve cord - segmental ganglia Heteronomy specialization of segments and segmented appendages Specialization of segments and segmental appendages Tagmatization Fusion of segments into functional units = Tagma e.g., Insect: head, thorax, abdomen Crustacean: cephalothorax, abdomen Spider: prosoma, opisthosoma Insect: Head, Thorax, Abdomen Lobster: Cephalothorax, Abdomen 4 Spider: Prosoma, Opisthosoma Different tagma in different taxa, and different...
View Full Document

Page1 / 10

Artrhopoda I Oct 26 - 1 Phylum Phylum Arthropoda Arthropoda...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online