Molluschi - Mollusca

Calamaro di Lesson - Sepioteuthis lessoniana

Calamaro di Lesson - Sepioteuthis lessoniana

Il calamaro di Lesson (Sepioteuthis lessoniana)  è un calamaro appartenente alla famiglia Loliginidae proveniente dall’Indo-Pacifico. È una delle tre specie riconosciute nel genere Sepioteuthis, ...
Chitone del Mediterraneo - Chiton olivaceus

Chitone del Mediterraneo - Chiton olivaceus

Il Chitone del Mediterraneo (Chiton olivaceus, Spengler 1797) è un mollusco poliplacoforo della famiglia Chitonidae. Di forma ovale allungata (lungh. media: 25 mm), dotato di piastre carenate con coste molto robuste. ...
Cypraeidae - Luria Lurida

Cypraeidae - Luria Lurida

Luria lurida is a species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries. Ciprea Mediterranea Luria lurida intotheblue.it Cypraeidae ...
Date mussel - Lithophaga lithophaga

Date mussel - Lithophaga lithophaga

Sea Date shell, Lithophaga lithophaga, grows and lives inside the rocks, so it is practically impossible to see and film it unless the rock where it is found is shattered, an obviously illegal practice, prohibited by the regulations of all Mediterranean...
Ear of Venus - Haliotis - Tuberculata Lamellosa

Ear of Venus - Haliotis - Tuberculata Lamellosa

Ear of Venus, Aliotide or Haliotis (tuberculata lamellosa) is a genus of marine gastropod molluscs, commonly known as abalone, sea-ear or abalone. ...
Gastropod - Patellae

Gastropod - Patellae

Patella is a genus of gastropod mollusks of the Patellidae family.Patella gastropod mollusks Patellidae family intotheblue.it ...
Giant tridacna - Tridacna gigas

Giant tridacna - Tridacna gigas

Giant tridacna (Tridacna gigas (Linnaeus, 1758)) is a bivalve mollusk of the Cardiidae family. tridacna gigante Tridacna gigas Cardiidae intotheblue.it ...
Grey bonnet or Glaucus bonnet - Phalium glaucum

Grey bonnet or Glaucus bonnet - Phalium glaucum

Phalium glaucum, common name the grey bonnet or glaucus bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails. This species lives on sandy bottoms with seagrass meadows, in intertidal an...
Maxima clam - Tridacna maxima

Maxima clam - Tridacna maxima

Maxima clam - Tridacna maxima - Variable Giant Clam è una specie di mollusco bivalve diffuso in tutta la regione Indo-Pacifico. ...
Mediterranean scallop - Pecten jacobaeus

Mediterranean scallop - Pecten jacobaeus

This bivalve mollusc, Scallop (Mediterranean scallop) Pecten jacobaeus shell is rather sought after for the goodness of its meat and, not only by humans but above all by the Octopus (Octopus vulgaris) of which it is greedy like almost all molluscs. ....
Murex - Muricidae

Murex - Muricidae

Muricids (Muricidae Rafinesque, 1815) are a family of gastropod molluscs of the subclass Caenogastropoda. They are the only family in the superfamily Muricoidea Rafinesque, 1815. They were appreciated since ancient times by the Phoenicians, Greeks and...
Murex - Hexaplex trunculus

Murex - Hexaplex trunculus

Hexaplex trunculus (also known as Murex trunculus, Phyllonotus trunculus,) is a medium-sized sea snail, a marine gastropod mollusk in the family Muricidae, the murex  shells or rock snails. ...
Red-mouthed rock shell - Muricidae - Stramonita haemastoma

Red-mouthed rock shell - Muricidae - Stramonita haemastoma

Stramonita haemastoma, common name the red-mouthed rock shell or the Florida dog winkle, is a species of predatory sea snail, a marine gastropod mollusc in the family Muricidae, the rock snails. ...
Spiny dye-murex - Bolinus brandaris

Spiny dye-murex - Bolinus brandaris

Bolinus brandaris (originally called Murex brandaris by Linnaeus and also Haustellum brandaris), and commonly known as the purple dye murex or the spiny dye-murex, is a species of medium-sized predatory sea snail, an edible marine gastropod mollusk in th...
Nacchera - Pinna nobilis

Nacchera - Pinna nobilis

Pinna nobilis (Linnaeus 1758), comunemente nota come nacchera, pinna comune, cozza penna o stura, è il più grande bivalve presente nel Mar Mediterraneo. ...
Nudibranchi - Nudibranchia

Nudibranchi - Nudibranchia

I nudibranchi (Nudibranchia (Blainville, 1814)) sono un sottordine di molluschi dell'ordine Opisthobranchia, che comprende più di 7000 specie descritte. ...
Doride dipinto - Felimare picta

Doride dipinto - Felimare picta

Con questo articolo aggiungiamo una nuova specie ai Nudibranchi filmati su intotheblue.it. Si tratta del Doride dipinto, Felimare picta, una delle lumache di mare appartenente al genere Nudibranchia più colorata del Mar Mediterraneo. ...
Doride giallo - Baptodoris cinnabarina

Doride giallo - Baptodoris cinnabarina

Nel tratto di mare che va da Cagliari a Villasimius in Sardegna abbiamo incontrato la Cinnabarina - Baptodoris cinnabarina, un esemplare di Nudibranchi di colore giallo ...
Doride tricolore - Felimare tricolor

Doride tricolore - Felimare tricolor

Abbiamo trovato questi tre esemplari di Doride Tricolore su un fondale di roccia e coralligeno ad una profondità che varia dai 45 ai 50 metri. Questi animali sono piuttosto comuni nel Mediterraneo e sono anche difficili da fotografare e filmare ...
Dotted sea slug - Peltodoris atromaculata - Discodoris atromaculata

Dotted sea slug - Peltodoris atromaculata - Discodoris atromaculata

Peltodoris atromaculata, more commonly known as the dotted sea slug or sea cow, is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Discodorididae. ...
Jorunna funebris - Nudibranchs

Jorunna funebris - Nudibranchs

Jorunna funebris, common name the dotted nudibranch, is a large species  of sea lung, a dorid nudibranch, a shell-less marine gastropod mollusc  in the family  Discodoridae. ...
Lepre di mare dagli Anelli - Aplysia dactylomela

Lepre di mare dagli Anelli - Aplysia dactylomela

Aplysia dactylomela , conosciuta anche come Aplysia degli Anelli o Lepre di mare dagli Anelli, è Mollusco nudibranco  gasteropode di medie dimensioni (10-20 cm) appartenente alla famiglia Aplysiidae. ...
Sea hare - Aplysia depilans

Sea hare - Aplysia depilans

Sea hare, Spanish Mediterranean Ballerina (Aplysia depilans Gmelin, 1791) also known as sea scia is an anaspidic mollusk of the Aplysiidae family. ...
Umbraculum mediterraneum – Umbraculum umbraculum

Umbraculum mediterraneum – Umbraculum umbraculum

Umbraculum mediterraneum è un Mollusco Gasteropode Heterobranchia appartenente all’ordine dei Notaspidei. Probabilmente insieme alla Aplysia depilans, è tra i nudibranchi più grandi presenti nel mar Mediterraneo. ...
Ostrica - Ostrea

Ostrica - Ostrea

Ostrea (nome volgare ostrica) è un genere di molluschi bivalvi dalla conchiglia tondeggiante ricoperta di lamelle squamose ondulate. ...
Ostrica alata - Pteria hirundo

Ostrica alata - Pteria hirundo

L’ Ostrica alata, Pteria hirundo è un mollusco appartenente alla classe Bivalvi ed alla famiglia Pteriidae. Le due valve sono disuguali e quella inferiore, a cui è ancorato l'animale, è più grande e incavata della superiore. Il mollusco ha corpo di fo...
Polpo - Octopus vulgaris

Polpo - Octopus vulgaris

Il polpo comune (Octopus vulgaris Cuvier, 1797) o piovra, chiamato erroneamente polipo (nome del tutto scorretto da un punto di vista zoologico), è un cefalopode della famiglia Octopodidae ...
Spiny Oysters - Spondylus gaederopus

Spiny Oysters - Spondylus gaederopus

This Oyster, Spondylus gaederopus, has become rare to come across for various reasons; some maintain that there has been an excessive fishing for food purposes, others maintain that their rarefaction is due to an epidemic which has affected the species....
Strombus gigas - Lobatus gigas

Strombus gigas - Lobatus gigas

Il lobatus gigas, noto come strombus gigas, comunemente noto come la conchiglia regina, è una specie di grande lumaca commestibile, un mollusco gasteropode marino appartenente alla famiglia Strombidae ...
Triton's trumpet Giant Triton - Charonia tritonis

Triton's trumpet Giant Triton - Charonia tritonis

Charonia tritonis, common name the Triton's trumpet or the Giant Triton, is a species of very large sea snail, a marine gastropod mollusc in the family Charoniidae, the tritons. ...

Otriche – intotheblue.it

Mollusca is a large phylum of invertebrate animals whose members are known as molluscs or mollusks (/ˈmɒləsk/). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species.

Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrialhabitats. They are highly diverse, not just in size and in anatomical structure, but also in behaviour and in habitat. The phylum is typically divided into 9 or 10 taxonomic classes, of which two are entirely extinctCephalopod molluscs, such as squidcuttlefish and octopus, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods (snails and slugs) are by far the most numerous molluscs in terms of classified species, and account for 80% of the total.

Pinna Nobilis Naccera Noble Pen - intotheblue.it
Pinna Nobilis Naccera Noble Pen – intotheblue.it

The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula(except for bivalves), and the structure of the nervous system. Other than these common elements, molluscs express great morphological diversity, so many textbooks base their descriptions on a “hypothetical ancestral mollusc” (see image below). This has a single, “limpet-like” shell on top, which is made of proteins and chitin reinforced with calcium carbonate, and is secreted by a mantle covering the whole upper surface.

The underside of the animal consists of a single muscular “foot”. Although molluscs are coelomates, the coelom tends to be small. The main body cavity is a hemocoel through which bloodcirculates; as such, their circulatory systems are mainly open. The “generalized” mollusc’s feeding system consists of a rasping “tongue”, the radula, and a complex digestive system in which exuded mucus and microscopic, muscle-powered “hairs” called cilia play various important roles. The generalized mollusc has two paired nerve cords, or three in bivalves. The brain, in species that have one, encircles the esophagus. Most molluscs have eyes, and all have sensors to detect chemicals, vibrations, and touch. The simplest type of molluscan reproductive system relies on external fertilization, but more complex variations occur. All produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults.

Good evidence exists for the appearance of gastropods, cephalopods and bivalves in the Cambrian period 541 to 485.4 million years ago. However, the evolutionary history both of molluscs’ emergence from the ancestral Lophotrochozoa and of their diversification into the well-known living and fossil forms are still subjects of vigorous debate among scientists.

Polpo Comune – Octopus Vulgaris – Common Octopus – intotheblue.it

Molluscs have been and still are an important food source for anatomically modern humans. There is a risk of food poisoning from toxins which can accumulate in certain molluscs under specific conditions, however, and because of this, many countries have regulations to reduce this risk. Molluscs have, for centuries, also been the source of important luxury goods, notably pearlsmother of pearlTyrian purple dye, and sea silk. Their shells have also been used as money in some preindustrial societies.

Polpo – Octopus – intotheblue.it

Mollusc species can also represent hazards or pests for human activities. The bite of the blue-ringed octopus is often fatal, and that of Octopus apollyoncauses inflammation that can last for over a month. Stings from a few species of large tropical cone shells can also kill, but their sophisticated, though easily produced, venoms have become important tools in neurological research. Schistosomiasis (also known as bilharzia, bilharziosis or snail fever) is transmitted to humans via water snail hosts, and affects about 200 million people. Snails and slugs can also be serious agricultural pests, and accidental or deliberate introduction of some snail species into new environments has seriously damaged some ecosystems.

 

https://en.wikipedia.org/wiki/Mollusca

 

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