Invertebrates 9 Flashcards
Insecta are sucessful because:
Protective cuticle and Flight
The protective cuticle is usually for:
Hard forewings (elytra) Flat body Min. Exposed membrane Heavily sclerotized Protect from predators and harm
Evolution: what are insectas impossible without?
Rigid cuticle
Evolution of flight: Advantages for Insecta are:
Dispersal, colonise new habitats, escape predators
Difference between protostomia and deuterostomia:
- Acoelomate
- pseudo
- Coelo
P: 1, 2 + 3
D: 3
Difference between protostomia and deuterostomia: Cleavages?!?
P: spiral and determined
D: radial and indetermined
Difference between protostomia and deuterostomia: How is the Coelom formed?
P: Schizocoelus =between gut and ectoderm, form as slit between solid mesoderm
D: enterocoelus =mesoderm buds from wall to develop gut. Split off and forms coelom (“slit”)
Difference between protostomia and deuterostomia: Blastopore becomes…?
P: mouth, anus later
D: anus, mouth later
The ecology of Echinodermata (where do they live and what kind of style do they move)?
Marine
Sessile or slow moving
Echinodermata have a pentaradial symmetry. What does this mean? And what shape is their larvae?
5 parts radiate from the center.
Larvae is bilaterally symmetrical.
Echinodermata have a unique water vascular system. What kind of system is it operated by?
Hydraulically (operated system for movement)
Echinodermata consists of:
Madreporite (water inlet) Ring canal Radial canal Tube feet Ampullae
The organ system of Echinodermata: excretory and resp is?
Nitrogen excretion & gas exchange
The organ system of Echinodermata: what kind of digestive system?
Complete gut: Ventral mouth Dorsal anus Digestive glands (enzymes) Stomach
The organ system of Echinodermata: the movement is controlled by?
Radial nerves
