Bivalves 0.0 / 5 ? zoologyOrganismal DiversityUniversityNone Created by: Omar-uniCreated on: 05-01-20 15:33 What habitats are Bivalves found in? Marine and Freshwater, on rocks and in sediment 1 of 23 What is the Morphology of a Bivalve? Enclosed by shell of 2 valves. Hinge Ligament and adductor muscle. No eyes, radula or head 2 of 23 What is the Periostracum? Thin organic coating 'skin' covering 2-4 calcareous layers 3 of 23 What is the oldest part of the shell called? The Umbo 4 of 23 Where do the growth rings start? From the Umbo 5 of 23 How does the Bivalve shell close? The adductor muscle contracts 6 of 23 What prevents lateral movement of the shell? Hinge teeth and sockets 7 of 23 What can be used to estimate the age of a Bivalve? By counting the number of growth rings, more rings= older 8 of 23 What does Epifaunal mean? Living on the surface 9 of 23 How do Bivalves attach to a surface? Using Byssal threads 10 of 23 How do some Bivalves burrow? Using blade-like foot to burrow/anchor 11 of 23 How do Bivalves attach using Byssal threads? The threads are secreted as liquid by byssus gland in foot, once threads attach they harden rapidly, tethering animal preventing dislodgement 12 of 23 How do Bivalves bore? Mostly mechanical some acidic mucus 13 of 23 What does Boring lead to? Permanent entrapment as the hole gets deeper and the Bivalves grows. 14 of 23 What can you see on a trapped Bivalve? Only the Siphons 15 of 23 How do Bivalves feed? Mostly deposit feeding microphagy. Some suspension feeders 16 of 23 What are the 3 main classifications of Gill structure? The Filibranch, Pseudolamellibranch and Eulamellibranch 17 of 23 What is a Cephalopod? An ancient group consisting of Octopus, cuttlefish, squid and Nautilius 18 of 23 How many subclasses of Cephalopod are there? 2 19 of 23 What are the 2 subclasses of Cephalopod? Nautiloidea and Coleoidea 20 of 23 Which of the species of Cephalopod is the only one with a shell? The Nautilius 21 of 23 How do Bivalves circulate oxygen around blood? The Pericardial cavity holds heart and also part of the digestive tract. Artery opens into sinuses which bathes tissues in oxygenated blood 22 of 23 How do Bivalves reproduce? By external fertilisation, sperm and oocytes released into water , most are dioecious. 23 of 23
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