a marine organism that lives in warm waters and forms clusters of polyps, which secrete calcium carbonate to build a hard skeleton
Coral refers to a diverse group of marine organisms that form colonies of calcium carbonate structures, known as coral reefs. These reef-building corals provide habitats for a wide range of marine life and are characterized by their beautiful and vibrant colors. Corals play a crucial role in maintaining the health of marine ecosystems and are often considered the "rainforests of the sea" due to their high biodiversity and ecological significance.
a marine creature with eight arms and two longer tentacles and an internal flat shell, which produces an ink-like substance when in danger
A cuttlefish is a marine mollusk that belongs to the same family as squids and octopuses. They have a unique ability to rapidly change the color and pattern of their skin, allowing them to camouflage and communicate with other individuals. Cuttlefish have a soft body enclosed in a calcified shell called a cuttlebone, which helps control their buoyancy. They are highly intelligent and exhibit complex behaviors, including hunting prey, mating displays, and intricate communication through visual signals. With their mesmerizing appearance and fascinating abilities, cuttlefish are captivating creatures of the ocean.
a sea creature that has a bell-shaped body, which is gelatinous and transparent, long thin tentacles and a poisonous sting
A jellyfish is a gelatinous marine animal that belongs to the phylum Cnidaria. They are characterized by their umbrella-shaped body and long tentacles that contain specialized cells called cnidocytes, which can inject venom into their prey or predators. Jellyfish come in a wide variety of sizes, shapes, and colors, and they can be found in oceans worldwide. They move by contracting and relaxing their bodies, allowing them to drift and swim through the water. While some jellyfish species are harmless to humans, others can deliver painful stings. Despite their simple body structure, jellyfish play important ecological roles and are fascinating creatures of the sea.
/pˌoːɹtʃəɡˈiːz mˈænʌvwˈɔːɹ/
a large marine creature like jellyfish that lives in tropical and subtropical waters and has a poisonous sting
The Portuguese man-of-war is not a single organism but a colonial creature composed of various specialized polyps working together. It has a distinctive floating blue or purple gas-filled bladder that sits above the water, while long tentacles trail below, studded with venomous cells used for hunting and defense. Although it resembles a jellyfish, the Portuguese man-of-war is a different type of organism called a siphonophore. It is commonly found in warm ocean waters and can deliver painful stings to humans, sometimes causing severe reactions. Despite its beauty, the Portuguese man-of-war is best admired from a safe distance to avoid any unwanted encounters.
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a sea creature with eight, long arms and a soft round body with no internal shell
An octopus is a fascinating and highly intelligent marine creature belonging to the cephalopod family. With its soft body, bulbous head, and eight flexible arms, it is well-adapted to its underwater environment. The octopus is known for its remarkable ability to change color and shape, using specialized cells called chromatophores. It uses its arms to move, manipulate objects, and capture prey, often employing clever tactics and problem-solving skills. With its keen senses and dexterous movements, the octopus is a formidable hunter. Additionally, it possesses incredible camouflage skills, allowing it to blend seamlessly into its surroundings. Octopuses are found in oceans worldwide and play a vital role in marine ecosystems.
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the microscopic organisms floating in the sea or fresh water on which larger animals feed
Plankton refers to a diverse community of microscopic organisms that inhabit bodies of water, ranging from freshwater lakes to vast oceans. It includes both plant-like organisms called phytoplankton and animal-like organisms called zooplankton. These tiny organisms play a crucial role in marine ecosystems as they serve as the foundation of the food chain. Phytoplankton are responsible for producing a significant portion of the world's oxygen through photosynthesis, while zooplankton feed on the phytoplankton and serve as a food source for many larger marine organisms. Planktonic organisms are at the mercy of ocean currents, drifting along as they are unable to actively swim against the water flow. Despite their small size, plankton collectively have a massive impact on the health and productivity of aquatic ecosystems, making them essential components of the marine environment.
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a small and simple sea creature with a hollow cylindrical body and a ring of tentacles surrounding the mouth
A polyp is a tiny, typically sessile invertebrate organism that belongs to the phylum Cnidaria, which includes animals like corals and sea anemones. Polyps have a cylindrical body with a mouth surrounded by tentacles at one end. They are often attached to a substrate, such as a rock or coral reef, using a base called a foot. Polyps are known for their ability to reproduce asexually through a process called budding, where new polyps grow and eventually detach to form independent individuals. They also possess specialized cells called cnidocytes, which contain stinging structures called nematocysts used for defense and capturing prey. Polyps can form large colonies or solitary individuals, depending on the species, and they play a crucial role in the growth and formation of coral reefs, as well as providing habitats for a wide range of marine organisms.
/sˈiː ɐnˈɛməni/
a sea polyp that is predatory and resembles a flower, having bright colors
A sea anemone is a stationary marine animal that belongs to the phylum Cnidaria, similar to corals and jellyfish. It has a cylindrical body with a central mouth surrounded by tentacles. Sea anemones are usually attached to rocks or other substrates on the ocean floor using a muscular base called a pedal disc. They come in various sizes, shapes, and colors, and can be found in oceans worldwide. Sea anemones have a symbiotic relationship with clownfish, where the fish live among the tentacles for protection while providing food and nutrients to the anemone. They capture prey, such as small fish and invertebrates, using stinging cells called cnidocytes located on their tentacles. Sea anemones are fascinating creatures known for their vibrant beauty and unique adaptations, and they contribute to the biodiversity and ecological balance of marine ecosystems.
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/sˈiːhɔːɹs/
a small marine fish with an upright posture, a horse-like head and a curled tail
A seahorse is a small, fish-like creature that belongs to the genus Hippocampus. It has a unique appearance, with a long snout, a horseshoe-shaped body, and a curled tail. Unlike most fish, seahorses have a bony exoskeleton and swim in an upright position. They are found in various coastal habitats, including coral reefs, seagrass meadows, and mangrove forests. Seahorses are known for their remarkable ability to change color and blend into their surroundings, providing them with camouflage and protection from predators. They have specialized mouth that allows them to feed on tiny organisms by sucking them into their snout. Seahorses also exhibit an intriguing reproductive behavior, where males carry the fertilized eggs in a specialized pouch until they hatch.
a marine invertebrate with a body full of holes through which water can circulate and nutrients can be absorbed
A sponge is a simple multicellular organism that belongs to the phylum Porifera. They are characterized by their porous body structure, which is made up of numerous tiny openings called pores. Sponges can be found in a variety of marine environments, from shallow coastal waters to the depths of the ocean. They have a remarkable ability to filter water and extract nutrients from it using specialized cells called choanocytes. Sponges come in a wide range of sizes, shapes, and colors, with some species forming intricate and beautiful structures. They play important ecological roles by providing habitats and serving as filter feeders, helping to maintain water quality and biodiversity. Despite their seemingly simple appearance, sponges possess unique biological features and are a fascinating group of organisms in the marine ecosystem.
a marine creature that can change color and has a long soft body with ten tentacles helping it swim very fast
A squid is a marine cephalopod known for its elongated body, multiple tentacles, and jet propulsion abilities. They belong to the class Cephalopoda, which also includes octopuses and cuttlefish. Squids have a soft body enclosed in a muscular mantle, with a head that contains large eyes, a beak-like mouth, and sensory organs. They are highly adapted predators, using their tentacles to capture prey and their powerful siphon to propel themselves through the water. Squids are known for their remarkable intelligence, complex behavior, and ability to change color and camouflage themselves. They are important members of marine ecosystems, serving as both predators and prey and are valued as a food source in many cultures.
an echinoderm that has five arms arranged in the form of a star and feeds on mollusks
A starfish, also known as a sea star, is a fascinating marine creature characterized by its radial symmetry and distinctive star-like shape. They belong to the phylum Echinodermata and are found in various oceans around the world. Starfish have a central disk from which multiple arms radiate, typically five but sometimes more. These arms are often covered with small tube feet that aid in locomotion and capturing prey. Starfish are known for their ability to regenerate lost limbs, and some species can even regenerate an entire body from a single arm. They feed on a wide range of organisms, including mollusks, crustaceans, and even dead organic matter. Starfish play a crucial role in marine ecosystems as both predators and scavengers, and their presence adds to the diversity and beauty of the underwater world.
/zˈuːplæŋktən/
microscopic animals that float in bodies of water, serving as an important food source for many aquatic organisms
Zooplankton refers to small, often microscopic animals that drift in bodies of water, such as oceans, lakes, and rivers. They are an essential component of the aquatic food chain and serve as a primary food source for many larger organisms. Zooplankton comes in various shapes and sizes, ranging from tiny crustaceans to jellyfish larvae. They exhibit diverse feeding strategies, with some being filter feeders, consuming tiny particles suspended in the water, while others are predators, preying on smaller zooplankton or even other microorganisms. Despite their small size, zooplankton plays a vital role in maintaining the balance of marine and freshwater ecosystems, contributing to nutrient cycling and energy transfer.
/sˈiː ˈɜːtʃɪn/
a small marine animal that is covered with spines and has a round shell, harvested for food
A sea urchin is a small, spiny marine creature belonging to the echinoderm family. They have a spherical or globular body covered in sharp spines, which serve as a protective mechanism against predators. Sea urchins are found in oceans around the world, inhabiting diverse habitats such as rocky shores, coral reefs, and seagrass beds. They play an important ecological role by grazing on algae and helping to maintain the health of marine ecosystems. Additionally, their unique appearance and delicate movements make them fascinating creatures to observe in underwater environments.
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/wˈɛlk/
a marine gastropod that is predatory, used as food in Europe
A whelk is a type of marine gastropod mollusk characterized by its spiral-shaped shell and muscular foot. Whelks are commonly found in coastal waters and are known for their scavenging habits. They feed on a variety of prey, including shellfish, crustaceans, and even other mollusks. Whelks use their strong foot to crawl along the ocean floor in search of food. They have a rough, textured shell that provides protection and can come in a range of colors, from dark brown to pale yellow. Whelks are often harvested for human consumption and are a popular ingredient in seafood dishes.
/sˈiː kjˈuːkʌmbɚ/
an invertebrate with a wormlike body that is considered a marine creature and lives on seabed, with tentacles around the mouth
A sea cucumber is a marine animal that belongs to the phylum Echinodermata. They have a cylindrical body with soft, leathery skin and are typically found on the ocean floor. Sea cucumbers play a crucial role in marine ecosystems as they help recycle organic matter and maintain the health of the seabed. They feed on detritus and other organic particles, filtering them from the surrounding water. Sea cucumbers are known for their ability to expel their internal organs as a defense mechanism, which can be regenerated later. Some species of sea cucumbers are also harvested for human consumption and are considered a delicacy in certain cultures.
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