1. Euspongia
2. Oyster
3. Chalina
4. Clionav
Clionav
1. Asteroidea
2. Ophiuroidea
3. Crinoidea
4. Echinoidea
Crinoidea
1. Three pairs of legs and segmented body
2. Chitinous cuticle and two pairs of antennae
3. Jointed appendages and chitinous exoskeleton
4. Cephalothorax and tracheae
Jointed appendages and chitinous exoskeleton
1. 2 pairs in thorax 10 pair in abdomen
2. 2 pairs in thorax and 6 pairs in abdomen
3. 2 pairs in thorax and 8 pairs in abdomen
4. 2 pairs in thorax and 4 pairs in abdomen
2 pairs in thorax and 8 pairs in abdomen
1. red in colour, due to dissolved haemoglobin in plasma
2. red in colour, due to dissolved haemoglobin in corpuscles
3. blue in colour, due to dissolved haemocyanin in plasma
4. blue in colour, due to dissolved haemocyanin in corpuscles
red in colour, due to dissolved haemoglobin in plasma
1. Euplectella
2. Spongilla
3. Euspongia
4. Sycon
Spongilla
1. Crop
2. midgut
3. gizzard
4. ileum
midgut
1. development of gonads
2. pre-adult animal
3. metamorphosis
4. retention of larval or embryonic trait in the adult body.
retention of larval or embryonic trait in the adult body.
1. A
2. B
3. C
4. E
E
1. A
2. B
3. C
4. D
A