Molluscs diving in Marseille National Park of the Creeks

Molluscs

MollGasterNud-Peltodoris Atromaculata-DorisDalmatien-glider MollGasterNud-Janolus cristatus-NiolonErevineTombW-15m-11-04 MollGasterNud-Janolus cristatus-NiolonErevineSud-25m-21-05-0 MollGasterNud-Hypselodoris Villafranca-DorisBleu-vault-10m- MollGasterNud-Godiva banyulensis-NiolonQuai-15m-10-04-04-VMS MollGasterNud-Flabellina Babai-FlabellineBlanche-vault-25m- MollGasterNud-Flabellina affine + CnidHydroz-Halocordyle Dist MollGasterNud-Coryphella Pedata-Tiboulen-20m-17-04-04vmsg MollGasterNud-lysis Depilans-LièvreMer-PlanierTombant-(2) MollGaster-Ponte-NiolonErevineEst-25m-22-05-04-vmsg MollGaster-Neosimnia Spelta-SimnieBlanche-MoyadeTerre-20 (5) MollGaster-Haliotis Lamellosa-abalone-vault-10m-27-07-04-VmS MollGaster-Dolium Galea-TonneCannelée-helmet-ponte-glider-5 MOLLCÉPH-Sepia officinalis-SeichePonte-NiolonBaumeRousse-15m MOLLCÉPH-Sepia officinalis-cuttlefish-NiolonFrapaou-5m-12-04-04- MOLLCÉPH-Sepia officinalis-cuttlefish-NiolonFrapaou-5m-12-04 (4) MOLLCÉPH-Octopus vulgaris-PieuvrePoulpe-Tiboulen-5m-05-0 (4) MOLLCÉPH-Octopus vulgaris-PieuvrePoulpe-Tiboulen-5m-05-0 (1) MOLLCÉPH-Loligo vulgaris-CalamarCalmarPonte-NiolonQuai-10m-1 MollBivalv-Pteria Hirundo-AviculeHirondelle-glider-25m-(4) MollBivalv-Pinna nobilis-GrandeNacre-Carapègue-15m-23-06-04- MollBivalv-Arca noae-ArcheNoé-Tiboulen-10m-17-05-04-VMSG2

Number : 117 045 species listed. 7 Groups, very

Many families. The most important group after that of arthropods (1.7 million) and plants (375 000, Marine + terrestrial).

Description : Body with unsegmented bilateral symmetry: head with mouth and sensory organs (ocelli, rhynophores, tentacles), foot with lubricating mucous secretions has a highly developed musculature (sole of creep.), visceral mass containing the Internal organs. It is usually protected by a limestone shell secreted by the mantle. Gills in the mantle cavity.

Diversity of size: from the helcions, snails of a few millimetres observed on the ' Leaves ' (thallus) of kelp up to the giant squid (18 meters) of the large funds.

Diversity of elegance: from the black periwinkle of the rocks which only has interest in our plate to the beautiful comb of Venus.

Diversity of locomotion: Since the imperceptible movement of mussels that tear and re-create one by one the bindings of their byssus to the substrate up to the reaction cars profiled for the race, the pelagic squid.

Diversity of vision: from the one that distinguishes just the day of the night with its groupings of photosensitive cells up to the octopus whose quality of vision is comparable to ours by passing through the scallop and the holy Scallop with Their many real little eyes on the edge of their coat and not forgetting our Nautilus and pinhole camera!

Diversity of nutrition: micro-algae grazers with radula (clams), cleaning corpses (NASS), grazing of sponges, bryozoans and hydrozoans (slugs), not forgetting the bivalves that spend their time filtering the water from Our beaches and the most surprising, those

Who know how to catch harpoon fish too curious:

A few Tropical cones Formidable

     Very dangerous for the diver !

Diversity of reproduction: from the mussels that ejaculate their gametes in full water leaving to the nature the care to organize the meetings, until the mysterious couplings of octopuses who know how to keep their distance and finish their life, then, in protecting their eggs.

The heterogeneity is only apparent: the above species are only variants of the same fundamental structure, the archi-mollusc, a mysterious animal found only in the books.

Ecology: Diversity promotes the occupation of very varied ecological niches., the molluscs are found everywhere, in all seas, in freshwater (planorbe, zebra mussel) and even on land: the burgundy snail.

Remarks : The shells are all prettier than the others, they are often the object of the collectors ' lust. Spiraled for the most part, some are conical (shaped) in the shape of an ear (abalone) or egg (porcelain).

Deadly Danger: The tropical textile cone.

Reproduction : Molluscs have only one gonad, they reproduce exclusively by sexual means, with sexes in principle separated (gonochorisme). Exception: Sea slugs are hermaphrodite, well known for their ' no two '.

Evolution : Affinities with Worms (annelids).

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