Site pages
Current course
Participants
General
6 February - 12 February
13 February - 19 February
20 February - 26 February
27 February - 5 March
6 March - 12 March
13 March - 19 March
20 March - 26 March
27 March - 2 April
3 April - 9 April
10 April - 16 April
2.2.8.2.2. Super-order 2. Peracarida
Unit 2 - Sub-phylum Crustacea
2.2.8.2.2. Super-order 2. Peracarida
- Carapace, when present, leaving last 4 thoracic segments uncovered.
- Female has a thoracic brood pouch or marsupium.
Order 1.Mysidacea (Opossum shrimps)
- Mostly marine, some freshwater.
- Body elongated, carapace covering most of thorax.
- Anterior 2 pairs of thoracic appendages form maxillipedes
- Uropods form tail-fan.
Order 2.Cumacea
- Small, marine, deep littoral.
- Head and thorax greatly enlarged.
- Abdomen slender with styliform uropods.
- Carapace fused to first 3 or 4 thoracic segments.
Order 3.Tanaidacea
- Minute, marine, up to 4,000 meters in mud or tubes.
- Carapace small and fused to first 2 thoracic segments.
- Telson fuses with last abdominal segment
- Uropods slender.
Order 4.Isopoda (Pill bugs, Wood lice)
- Mostly marine, some freshwater and terrestrial.
- Body dorsoventrally flattened.
- Carapace absent.
- Gills and heart abdominal
Order 5. Amphipoda (Sand hoppers)
- Mostly marine, some freshwater and terrestrial.
- Body elongated often laterally compressed.
- Carapace absent.
- Gills and heart thoracic.
Last modified: Thursday, 18 August 2011, 10:51 AM