MOLLUSCS Výukový materiál OR Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/ Tento projekt je spolufinancován ESF a SR ČR
MOLLUSCS A very diverse group They live mostly in the sea but also in the fresh water and on the mainland Skin fold of the body = mantle ▫ It excretes calcareous substances from which their mantles are formed Mantle protects the soft body
MOLLUSCS
Orientation in the habitat at a different level according to their lifestyle: ▫ touch cells (slowly moving) ▫ smell cells ▫ cells checking the location ▫ sight organs simple eyes chamber eye
MOLLUSCS GASTROPODA BIVALVIA CEPHALOPODA
GASTROPODA (SNAILS) marine, freshwater, terrestrial they move slowly muscular foot muscular foot contains glands which excrete mucus; it makes the movement of terrestrial gastropoda easier most body is covered by a solid conch mostly gonochorists some of them hermaphrodites
GASTROPODA
They consume both plant and animal food A few species predators Breathing: ▫ water oxygen dissolved in the water (river snail) air oxygen – they swim to the water level (great pond nail, great ramshorn snail) ▫ terrestrial air oxygen
GASTROPODA burgundy Snail white lipped banded snail slug large red slug great pond snail river snail great ranshorn snail
BIVALVIA (MUSSELS) water molluscs (freshwater, saltwater) the body is covered by a shell consisting of two parts the inner side of the shell is made of a nacre layer some bivalvia live attached to hard surfaces they feed with phytoplankton
BIVALVIA oyster scallop mussel cockle pearl oyster clam
CEPHALOPODA marine predators foot modified into arms (tentacles; 8 – 10) with suckers the rest of arm transformed into a funnel eyes – perfectly evolved there is no mantle ▫ the relic – cuttlebone (sepia) ▫ nautilus - mantle
CEPHALOPODA cuttlefish squid octopus nautilus
REVISION: 1) The body of bivalvia is protected by? ▫ Shell 2) The body of gastropoda is protected by? ▫ Conch 3) Individual with both the sexual organs is called? ▫ Hermaphrodite 4) A gonochorist is? ▫ An individual that has either male or female sexual organs. 5) Squid belongs to? ▫ Cephalopoda
SOURCE: DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN