Top 9 Longest Living Sea Animals In The World (With Pictures)

9 World’s Longest Living Sea Animals

Here, we’ve done extensive researches and gathered the Top 9 Longest Living Sea Animals In The World through many sources. Let’s Take A Look

1. Hydra: Potentially Immortal

Longest Living Sea Animals In The World, Hydra

Hydra is a genus that includes tiny freshwater organisms belonging to Cnidaria and Hydrozoa class. They are indigenous to tropical and temperate regions. Biologists are particularly attracted to Hydra due to their ability to regenerate; they don’t appear to suffer from old age or age in any way. 

Hydra has a tubular circularly symmetric body that can be that can reach 10 millimeters when extended. It is secured with a single adhesive foot, also known as the Basal disc. Gland cells inside the disc’s basal region produce a sticky liquid that is responsible for its adhesive qualities. 

A mouth opening on the free side of your body is covered by a few thin tentacles that move. Each tentacle, also known as the cnida, is covered with extremely specialized stinging cells, known as Cnidocytes. When they come into contact with prey inside the nematocyst gets released explosively, releasing an unintentional dart-like thread that contains neurotoxins that enter whatever triggers the release. 

The game can be halted in particular when hundreds of nematocysts are released. Hydra is composed of two main body layers that make the substance “diploblastic.” They have been divided into mesoglea an emulsifying substance. 

This outer layer is known as the epidermis. The inner layer is known as the gastrodermis due to its lineage along the stomach. The cells comprising the two layers of the body are quite basic. 

Hydramacin is an anti-bacterial that was recently discovered in Hydra which shields the outer layer from infections. One Hydra comprises between 50,000 and 100,000 cells that comprise three distinct stem cell populations that generate a variety of cell types. Excreta and respiration occur through diffusion across the epidermis’s surface while more excreta is discharged through the mouth.

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2. Turritopsis Dohrnii: Also Potentially Immortal

Turritopsis Dohrnii
Turritopsis Dohrnii

Turritopsis dohrnii often referred to as an immortal jellyfish is a tiny jellyfish that are biologically immortal. They can be which is abundant from temperate to tropical waters. It is among the rare animals that are capable of completely returning to a sexually immature colonial stage following sexual maturity in a single individual. 

As with other hydrozoans, T. dohrnii begin their existence in the form of tiny free-swimming, larvae, known as planulae. When a planula settles and becomes more stable, it can create an entire colony of polyps that are connected to the seafloor. 

Jellyfish, also referred to as medusae, then break off of these polyps and live their lives in a free-swimming shape and eventually become sexually mature. As they mature sexually they have been observed to prey upon various jellyfish species. 

The ability to live forever with no limit on the duration of life is what makes T. dohrnii an essential research subject for fundamental physical, aging, and research in the field of pharmaceuticals. 

Medusas from Turritopsis dohrnii is bell-shaped and has the largest diameter of 4.5 millimeters. It’s about the same height as it’s wide. Turritopsis dohrnii also includes a bottom-living form of polyp known as a hydroid. It is composed of stolons running across the substrate, and upright branches, with feeding polyps, which can create medusa buds.

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3. Glass Sponge: 10,000+ Years Old

Glass Sponge
Glass Sponge

Hexactinellid sponges are those with a skeleton composed of four and six-pointed siliceous spikes that are commonly called glass sponges. They are generally classified with other sponges of the phylum Porifera however some scientists believe they are sufficiently different to warrant their own distinction, Symplasma. 

Many experts believe that glass sponges live the longest on the planet. These scientists have a tentative estimate of a life span that could be as high as 15,000 years. They’re more or less cup-shaped creatures that range from 10 to 30 centimeters in size and have strong lattice-like internal structures made of fused spicules made of silica. 

The body is homogeneous and has a huge central cavity, which in some species, can be opened outwards through a sieve made from the skeleton. The body is also composed of three distinct parts comprising the outer and the inner peripheral network of trabecular, and, finally the choanosome that serves as a food source. 

The choanosome serves as the mouth of the sponge. The canals in the inner and outward which meet at the choanosome serve as channels for food items, creating an intake path that the sponge can use. The hexactinellids of all species can expand to various dimensions, however, the maximal growth rate is believed to be approximately 32 centimeters in length. 

Some can even exceed the length of 32 centimeters and can extend their height to one meter long. The life expectancy of the hexactinellids which grow to around 1 meter is about 200 years. 

Glass sponges differ from other types of sponges in a myriad of ways. For instance, the majority of cytoplasm isn’t divided into cells separated by walls but is the syncytium which is a cytoplasm that is a continuous mass that has numerous nuclei.

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4. Black Coral: 4,000+ Years Old

Black Coral
Black Coral

Antipatharians often referred to by the name of black corals, or thorn corals are a group of soft corals in deep water. These corals are identified through their dark-brown or jet-black chitin skeletons and are surrounded by polyps. A lot of black corals offer shelter, housing food, and even protection for species of animals. 

They were originally classified as a category of Ceriantipatharia and ceriantharians but were later classified under Hexacorallia. They have been historically difficult to classify because of poor quality specimens. They exhibit a variety of distinct traits morphologically, and ones that are different between species, which is similar to other corals. 

At the time that Henri Milne-Edwards and Jules Haime first discovered black corals, two French Zoologists, in 1857 the entire kinds of Antipatharia were included in the family of Antipathidae.

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5. Ocean Quahog Clam: 500+ Years Old

Ocean Quahog Clam
Ocean Quahog Clam

The ocean quahog is an animal species of edible clams, which is an aquatic bivalve mollusk belonging to the family of Arctiidae. The species is indigenous in the North Atlantic Ocean, and it is commercially harvested as an ingredient in the food. 

The species is also known by a variety of names, such as Icelandic Cyprine, Mahogany clam mahogany quahog white clam, and black. Arctica Islandica exhibits slow growth compared to other clam species; it requires an average of 4 days to birth. For instance, A.

island from the German Bay of Kiel typically has a lifespan of around 30 years and those of in the German Bight about 150. In 1868, one specimen that was found alive near Iceland had a lifespan of 374 years. 

The analysis of its rate of growth and the oxygen isotope analysis indicated that it experienced an extremely variable growth rate at the height in the Little Ice Age around 1550-1620 and a moderate climate at the end of 1765-1780.

It also was the first to record the eruption at Mount Tambora in 1815. The slow pace of life results in extraordinary longevity, with the longest recorded age of Ming The Clam, which is 507 years. It is the longest-living metazoan species that are non-colonial with authentic longevity.

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6. Tubeworm: 300+ Years Old


Tubeworms are any sessile insect that binds its tail to the surface of the water and creates the mineral tube through which it can withdraw all of the body. The Greenland shark is also known as the grey shark, or its Kalaallisut name eqalussuaq it is a massive shark belonging to the family of Somniosidae closely related to Pacific sleeper sharks of the southern region. 

The distribution of the species is mostly limited to the water of both the North Atlantic Ocean and the Arctic Ocean. The Greenland shark is the longest recorded life span of all vertebrate species. 

Colors can range from light cream-grey to blackish-brown. the body is generally uniform in Colour however, small dark spots or whitish streaks may be observed in the rear. This Greenland shark has been identified as an Apex predator, typically eats fish, and has been seen engaged in hunting seals across Canada. The prey that is found within the stomachs of Greenland sharks is a sign of the hunter-prey patterns of these predators.

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7. Greenland Shark: 272+ Years Old

Greenland Shark
Greenland Shark

Freshwater pearl mussels are an endangered species of freshwater mussels, an aquatic bivalve mollusk belonging to the family of Margaritiferidae. While the term “freshwater pearl mussel” is commonly used to describe the species, other freshwater mussels species also produce pearls and are also used as sources of Mother of Pearls. 

The most popular pearls today are from Hyriopsis species found in Asia and Amblema species found in North America, both members of the closely related family Unionidae Pearls can also be found in species belonging to the Genus Unio. The inside in the shells of Margaritifera margaritifera is thick with Nacre. 

The species is capable of producing high-end pearls and has been historically utilized to find pearls that come from wild sources. This species is a favorite of Russian Malacologist Valeriy Zyuganov recently received a worldwide reputation for his discovery the pearl mussel had no signs of senescence.

He found that it could have a life span of between 210 and 250 years. Freshwater pearl mussels are among the oldest vertebrates currently in existence. The oldest known specimen from Europe was discovered in 1993, in Estonia at aged 134 years.

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8. Freshwater Pearl Mussel: 250+ Years Old

Freshwater Pearl Mussel

Baleen whale belongs to the Balaenidae family. Balaenidae and the sole living specimen belonging to the species Balaena. They are the sole baleen whale native in that region of the Arctic as well as the subarctic. 

The bowhead was a prime whaling target and their population was drastically diminished before a moratorium in 1966 was put in place to safeguard the species. 

Out of the five populations of bowheads, there are three that are listed as “endangered,” one as “vulnerable,” and one as “lower risk, conservation dependent,” according to the IUCN Red List. The population of the world is rated as being of the lowest level of worry. 

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9. Bowhead Whale: Potentially 200+ Years Old

Bowhead Whale
Bowhead Whale

The bowhead whale is a large, strong body with a dark-colored, dark-colored lower jaw with a white chin. It is a huge triangular skull that allows it to break through Arctic ice to breathe. Inuit hunters have been reported to be seeing bowheads emerging from 60 centimeters of the ice.


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