Nematodes Flashcards
Are Nematodes protostome or deuterostome?
Protostome
What super-phylum do Nematodes belong to?
Ecdyozoa
What kind of coelom do Nematodes have?
Pseudocoelom
What kind of muscles do Nematodes have?
Longitudinal muscles
What is eutely?
A fixed number of cells. No new cells are added, instead existing cells grow larger.
What kind of gut do Nematodes have?
Complete gut
What is the evolutionary chain leading to Nematodes?
Multicellularity, tissue level organization, bilateral symmetry, coelom, cephalization, protostome development, molting (ecdysis)
What is significant about the nematode genome?
The nematode genome is fully sequenced and all nerve connections are mapped. Significant for genetics and DNA research.
Life mode(s)?
Parasitic, symbiotic and free-living
What layer is outside the epidermis?
Cuticle that molts
If there is no coelom, how does the body support it’s shape?
High pressure body cavity pseodocoelom filled with fluid.
What kind of movement do Nematodes display?
Whip-like based on longitudinal muscles.
3 factors in nematode locomotion
- rigid cuticle with multiple layers of collagen fibre with different orientations
- high pressure pseodocoelom
- longitudinal muscles
How do Nematodes reproduce?
Asexual parthenogenesis (unfertilized eggs) And sexual dioecious
How do Nematodes develope?
No firm larval stage
Cells increase in size with each molt, no cell number increase
