Arthropods 1 Flashcards
1
Q
Phyllum Arthopoda
A
- “Artho” = joint, “poda” = feet
- Bilateral symetry, coelomates
- Paired joined apprendages
- Hard chitin Exoskelton, segregated by epidermis
- Over 1 million species
2
Q
Advantages of exoskeleton
A
- Evironment independance
- Protection
- Reudced water loss
- Effecient locomotion
3
Q
Disadvantages of exoskeleton
A
- Limit growing
- Limit gas exchange
- Limit movement
4
Q
Types of gas exchange in Arthropods
A
- Through the skin in small organisms
- Gills
- Book lungs
- Trachae
5
Q
Book lungs
A
- Air comes in
- Oxygen transferred in a lammellated cavity
- Through the lamalae to bloodstream
- Scorpions and spiders
6
Q
Trachae
A
- Oxygen travels through increasingly narrow channels
- Directly to muscles and organs
- Effeciency constrained by oxygen concentration and size
- Insects, millipedes
7
Q
Reproduction
A
- Separate sexes
- Internal fertilisation in most
- External fertilisation in horseshoe crabs
- Indirect sperm transfer, using a Spermatophere
- Direct sperm transfer
- Courtship rituals
8
Q
Adaptions to life on land
A
- Exoskeleton and jointed legs
- Reduced water loss
- Gills replaced by booklung or trachae
- Internal fertilisation
- Excretion of nitrogen as uric acid or guanine
9
Q
Subphyllum Myriapoda
A
- “Myraid” = countless, “poda” = feet
- All terrestrail
- Head with one pair of antenna
- Segmented body
- Epicuticle waxy and waterproof
- Gas exchange by trachae
- Mandibles and simple eyes
- Millipides (2 leg pairs per segment)
- Centipides (1 leg pair per segment)
- Indirect sperm transfer
10
Q
Subphyllum Crustacea
A
- “Crusta” = crust
- Shrimps, crabs, copelods, water fleas
- Gill gas exchange
- Aqautic except woodlouse
- Epicuticle lacking waxy waterproof
- Compound and simple eyes
11
Q
Sexual reproduction in Crustacea
A
- Internal or external
- Seminal receptor in females
- Females lay eggs and carry until hatching
