Invertebrates 1 Flashcards
1
Q
What are the different types of body cavities?
A
- Acoelomates
- Coelomates
- Pseudocoelomates
2
Q
Acoelomates
A
No enclosed body cavities
3
Q
Coelomates
A
The coelom (cavity) and the internal organs are surrounded by mesoderm muscle
4
Q
Pseudocoelomates
A
The pseudocoelom (cavity) is lined with mesoderm, but no muscle lining the internal organs
5
Q
Phyllum Mollusca
A
- “Molluscus” = soft
- Contains snails, clams and Octopi
- 93,000 species
- Bilateral symmetry, coelomates
- Mantly membrance secretes shell
- Muscular foot for locomotion
- Well developed head and redula for feeding
6
Q
Taxa Bivalvia
A
- “Bi” = two, “Valva” = two
- Aquatic animals with two shell valves
- bilateral
- Sedimentary or burrowing
- No radula for feeding
- Expanded gills for filter-feeding
- Separate sexes, external fertilisation and free-swimming larvae
7
Q
Gastropoda
A
- “Gastro” = stomach, “Poda” = foot
- Aquatic and terrestrial
- Well developed head, tentacles and eyes
- Assymetric body due to shell coiling and torsion
- Ctenidia = needs humid conditions
8
Q
Gastropoda mating
A
- Individuals have both genitals on head
- Elaborate and slow mating ritual
- Exchange sperm and a love dart
- Love darts are a secondary sexual characteristic
- Darter gains more fertilisation
9
Q
Cepalonpoda
A
- “Cepahlon” = foot, “poda” = foot
- Marine predators
- Intergal head and foot
- Usually internal shells
- Squid have an elongated body, fins and jet propulsion
- Brains in braincases
- Seperate sexes with courtship behaviours
- Highly developed brain and sophisticated behavior
10
Q
Phyllum Annelida
A
- “Annell = ringed”
- Earthworms, bristleworms, fanworms and leeches
- 16,500 species
- Bilateral symmetry coelomates and segemented body
- Chaetae bristles help with movement
- Marine, freshwater and terrestral
11
Q
Polychaeta
A
Many bristles, marine annelids, mobile and sedimentary
12
Q
Oligochaeta
A
Terrestral and aqautic annelids with fw bristles
13
Q
Hir/vudina
A
Ecotparasties or predators, few bristles, blood suckers
14
Q
What are the new classes?
A
- Erranta - marine predators, well defined
- Sedentia - marine sedenetary worms, leeches, earthworms
15
Q
Coral reefs
A
- Reefs form in shallow clear warm water
- Stony coral and symbiotive zooxnthellae
- Among the most diverse ecosystems on earth
- easily damaged and highly threatened
- Coal bleaching
