Koh Lanta Marine Life

Discover The Andaman Sea

From tiny macro animals, to the largest fish in the sea, we are very lucky to be located on Koh Lanta, an area with a huge abundance and diversity of tropical marine life and some of the best dive sites in Thailand.

Learn all about the wonderful animals we find underwater on our dives, including hard and soft corals, anemones, rays, an enormous number of fish species, sharks, shrimp, nudibranchs, turtles, snakes, octopus and so much more.

Chinese Trumpetfish (Aulostomus chinensis)

Granular Sea Star (Choriaster granulatus)

Hawksbill Sea Turtle (Eretmochelys imbricata)

Clown Triggerfish (Balistoides conspicillum)

Our Marine Life Guide is not yet complete, but we already have photos of hundreds of species found diving around Koh Lanta. We will be adding more species every season, diving, photographing and writing about our amazing marine life.

Dive slowly and keep your eyes open - you never know what you might see...

Book online to save 10% on dive trips and scuba courses on Koh Lanta.

Sharks & Rays

Leopard (Zebra) Shark (Stegostoma fasciatum)

The elasmobranchii group of cartilaginous fish contains the sharks and rays, which, unlike bony fishes, have a skeleton made of light-weight cartilage.

Eight-banded Butterflyfish (Chaetodon octofasciatus)

Actinopterygii, the ray-finned fish are a subclass of the bony fishes. The fins of this type of fish are constructed from webs of skin supported by bony or horny spines. Ray-finned fish are the dominant aquatic vertebrates today, making up about half of all vertebrate species known. Any animal with a back-bone is called a vertebrate.

Reptiles are cold-blooded, air-breathing vertebrates (have lungs) with a bony skeleton and a body usually covered with scales or horny plates. Reptile reproduction lacks a larval stage (are usually egg-laying) and includes turtles, snakes, crocodiles and lizards.

Octopus, squid, cuttlefish and nautilus are all molluscs of the class cephalopod. Cephalopods are exclusively marine animals, with a prominent head, a set of tentacles and a common ability to squirt ink in times of stress.

Acropora Table Coral (Acropora korusini)

Although many people mistake corals and anemones as plants, they are actually animals called Anthozoa, which in turn belong to a larger group of animals called cnidarians that carry a sting in their tentacles.

Branching Fire Coral (Millepora tenella)

The Hydrozoa are a large group of solitary and colonial animals which have a complex life cycle which often involves an alternation between sessile (fixed in one place) polyp phase and a free-swimming medusa stage, similar to the True Jellyfish.

Decapod crustaceans are ten-footed (five pairs of legs) scavenging marine animals which include many familiar groups, such as crabs, hermit crabs, lobsters, and shrimp.

Girdled Glossodoris (Glossodoris cincta)

The gastropods, more commonly known as snails and slugs are among the few groups of animals to have become successful in all three major habitats: the ocean, fresh water, and land.

Blue Sea Star (Linckia laevigata) @ Koh Haa Lagoon

Echinoderms get their name from the Latin for Spiny Skinned - Echinodermata. All Echinoderms have radial symmetry; a body construction which points outwards from the centre. This normally consists of more than 5 equal segments, each containing a set of various internal organs.

Marine members of the Bivalvia class are molluscs that have laterally flattened bodies enclosed by a shell formed of two hinged parts. They include clams, oysters, mussels and scallops and most are filter feeders. The gills have evolved into specialised organs for feeding and breathing.

Sponges are some of the oldest known multi cellular animal inhabiting the earth and have been around for over 500 million years. They are one of the reefs most important sedentary inhabitants, filtering water through their porous bodies, ingesting nutrients as food and releasing essential nutrients back in the seas through their main cavity called the Osculum.

Christmas Tree Worm (Spirobranchus giganteus)

The Polychaeta are a huge group of marine worms, also known as the bristle worms or polychaetes. They are among the most common marine organisms.

Sea Tomato (Crambione mastigophora) @ Koh Haa

The Scyphozoa, referred to as the true jellyfish, are related to corals and anemones (anthozoans), however they differ from these in having a more complex life cycle.

Diving Trips & Scuba Courses

Join our high season speedboat dive trips to some of Thailand's best dive sites and enjoy small groups, short journey times, and a focus on great personal service, safety and fun.

Koh Lanta has easy access to dozens of dive sites, including more than 12 dive sites at Koh Haa, multiple dive sites at the Bida Islands, Koh Rok, Koh Phi Phi Leh, Hin Daeng & Hin Muang, and many more.

Not yet a certified diver? Learn to dive with the globally recognised Open Water Diver course with our fantastic dive instructors here on Koh Lanta.

Book online to save 10% on dive trips and scuba courses on Koh Lanta.

Find Out More

Indo-Pacific Marine Life Guides

Allen, G., Steene, R., Humann, P., DeLoach, N. (2003) Reef Fish Identification, Tropical Pacific. Jacksonville, FL., USA: New World Publications, Inc., ISBN 1-878348-36-1.
Humann, P., DeLoach, N., (2010) Reef Creature Identification, Tropical Pacific. Jacksonville, FL., USA: New World Publications Inc., ISBN 978-1-878348-44-9
Debelius, H. (2013) Indian Ocean Reef Guide. Frankfurt, Germany: IKAN - Unterwasserarchiv, ISBN 978-3-939767-52-7.
Debelius, H. (2004) Nudibranchs and Sea Snails, Indo-Pacific Field Guide. Frankfurt, Germany: IKAN - Unterwasserarchiv, ISBN 3-925919-51-1
Erhardt, H., Knop, D. (2015) Corals Indo-Pacific Field Guide. Frankfurt, Germany: IKAN - Unterwasserarchiv, ISBN 3-925919-69-4.
Veron J.E.N., Stafford-Smith M.G., Turak E. and DeVantier L.M. (2016). Corals of the World

More Marine Life References and Further Information

Koh Lanta Marine Life

Discover The Andaman Sea

Sharks & Rays

Ray-finned Fishes

Turtles & Snakes

Octopus, Cuttlefish & Squid

Corals & Anemones

Fire Corals & Hydroids

Crabs, Lobster & Shrimp

Slugs & Snails

Sea Stars, Urchins & Sea Cucumbers

Clams & Oysters

Sponges

Bristle Worms

Jellyfish

Koh Lanta Dive Trips

Diving Trips & Scuba Courses

Find Out More

Indo-Pacific Marine Life Guides

Dive Trips & Scuba Courses