We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What are Mollusks?

Michael Anissimov
Updated May 21, 2024
Our promise to you
All The Science is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At All The Science, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Mollusks (British spelling: molluscs) are a large and diverse phyla of invertebrate animals, featuring over 110,000 species. Their phylum name, Mollusca, means "thin-shelled," though many species lack shells entirely. Mollusks include clams, oysters, scallops, mussels, snails, squid, octopuses, slugs, nudibranchs, sea hares, and several classes of deep-sea wormlike creatures. Some mollusks — snails and slugs — have even adapted to life on land. Mollusca is one of the "Big Nine" animal phyla, alongside Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Echinodermata, and Chordata.

For thousands of years, mollusks have been one of mankind's favorite sea creatures alongside fish and crustaceans, providing us with their meat and decorative shells. Shell middens, huge stacks of shells left by prehistoric peoples, line many the coastal zones of the world, providing important evidence about our ancestors' migration patterns and lifestyles. Some middens are tens of thousands of years old.

Mollusks include a variety of record-holders and unusual animals. There's the Colossal Squid (Mesonychoteuthis hamiltoni), the largest of all modern invertebrates, which is at least 14 m (46) feet in length, the Vampire Squid (Vampyroteuthis infernalis, lit. "vampire squid from hell"), a phylogenetic relict with characteristics of both squids and octopuses, and nudibranchs (suborder Nudibranchia), some of the most beautiful and colorful marine animals that exist. Mollusks range in size from less than 1 mm, in the case of some micromollusks, to the Colossal Squid, which is capable of killing sperm whales for prey.

The defining characteristics of mollusks are a muscular foot, especially obvious in the case of snails, and the mantle, a protective dorsal body wall covering the main body from the outside. Between the mantle and the main body is a mantle cavity, containing the mollusk's gills, anus, and other organs. The mantle cavity may be used as a feeding structure (bivalves), respiratory chamber (all mollusks), brood chamber (numerous), or locomotory organ (squids and some clams).

All The Science is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Michael Anissimov
By Michael Anissimov , Writer
Michael Anissimov is a dedicated All The Science contributor and brings his expertise in paleontology, physics, biology, astronomy, chemistry, and futurism to his articles. An avid blogger, Michael is deeply passionate about stem cell research, regenerative medicine, and life extension therapies. His professional experience includes work with the Methuselah Foundation, Singularity Institute for Artificial Intelligence, and Lifeboat Foundation, further showcasing his commitment to scientific advancement.

Discussion Comments

By anon78185 — On Apr 17, 2010

The mollusk also refers to the CEO of Mollusk Marketing. Mollusk Marketing is a company with the soul of a deranged colossal squid, and an insatiable desire to prey upon humanity.

Michael Anissimov

Michael Anissimov


Michael Anissimov is a dedicated All The Science contributor and brings his expertise in paleontology, physics, biology...
Learn more
All The Science, in your inbox

Our latest articles, guides, and more, delivered daily.

All The Science, in your inbox

Our latest articles, guides, and more, delivered daily.