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Arth. Body Plan
Entomology
| Question | Answer |
|---|---|
| Invertebrate Classification: 1. Number of cells | -Diploid organisms that develop from a bastula (metazoans) -Unicellular or acellular |
| Invertebrate Classification: 2. Symmetry (bilateral symmetry. and radial symmetry.) | Bilateral symmetry: -Left and right sides that are mirrors -High correlation with cephalization -Concentration of nervous and sensory tissues and organs at one end of an organism Radial symmetry: -Symmetry around a central axis |
| Invertebrate Classification: 3. Developmental pattern | Germ layers: -Group of cells that behave as a functional unit during embryonic development -Give rise to distinctly different tissues and/or organs in adult |
| Some distinguishing characteristics of the phylum Arthropoda include: | All arthropods exhibit bilateral symmetry, with the left side being a mirror image of the right side All arthropods possess a hardened exoskeleton made of chitin |
| Some distinguishing characteristics of the phylum Arthropoda include con.: | All arthropods have a segmented body plan All arthropods have jointed appendages (Arthropoda = jointed; foot, leg) |
| Arthropoda Body Plan includes: | -Bilateral Symmetry Tagmosis -External Segmentation Tagmata -Exoskeleton Chitin -Jointed Appendages -Hemocoel -Ventral nerve cord and dorsal brain -Lack of circular muscles |
| Tagmosis: | Segments specialized for different functions |
| Metamerism: | Have external body segments with similar structures |
| Tagmata: | Specialized body regions |
| Primitive arthropods have? | Less specialized body segmentation |
| Complex arthropods have? | Segments that become more specialized |
| Modifications can occur within these segments? | Head – posses specialized mouthparts for feeding and sensory appendages. Thorax – posses specialized appendages for locomotion. Abdomen – can bear additional appendages; specialized for reproduction and digestion. |
| Exoskeleton: | Hardened exterior skeleton composed of chitin |