Arthropods Flashcards
Subphylum
- Chelicerata
- Myriapoda
- Crustacea
- Hexapoda
Subphylum
Chelicerata
* Appendages:
* # of legs:
* # of antennae:
* Tagmata:
- Appendages: 6 on cephalothorax
- # of legs: 8
- # of antennae: None
- Tagmata: Cephalothorax & abdomen
Subphylum
Myriapoda
* Appendages:
* # of legs:
* # of antennae:
* Tagmata:
- Appendages: Paired appendages on most trunk segments
- # of legs: 18 or more
- # of antennae: 2
- Tagmata: Head + segmented trunk
Subphylum
Crustacea
* Appendages:
* # of legs:
* # of antennae:
* Tagmata:
- Appendages: Variable on each body segment
- # of legs: 8 or more
- # of antennae: 4
- Tagmata: cephalothorax + abdomen
Subphylum
Hexapoda
* Appendages:
* # of legs:
* # of antennae:
* Tagmata:
* Classes:
- Appendages: On head and thorax
- # of legs: 6
- # of antennae: 2
- Tagmata: Head, thorax, abdomen
- Classes: Entognatha & Insecta
Adaptations of Arthropods
- Versatile exoskeleton
- Segmentation
- Air piped directly to cell
- Highly developed sensory organs
- Complex behaviours
- Metamorphosis
Versatile exoskeleton
- secreted by underlying epidermis
- Contains chitin
- Heavy - limits body size
- Hard & waterproof
- Thin & flexible between segments
Segmentation
- Exhibit metamerism
- Segments combine into functional units called tagamata
Air piped directly to cells
Aquatic arthropods
* breath through gills and O2 is carried through haemolymph
Terrestrial arthropods
* Used system of tubes called tracheae for gas exchange
Highly developed sensory organs
- Compound eye: visual
- Antannae: touch and smell
Complex behaviours
Most is innate but also demonstrate learned behaviour (basic form)
Metamorphosis
Sharp change in form during postembryonic development
Ametabolous
- Direct development
- Young like adults except in size/sexual maturation
Indirect development
Passes through larval stage
* Holometabolous
* Hemimetabolous
Indirect development
Holometabolous
- Indirect development
- Stages: Egg, larva, pupa, adult
- No further molting in adult stage
