Largest turtle that ever lived is the now extinct Archelon ischyros from the Western Interior Seaway, an ancient Cretaceous sea that divided the North American continent. The estimated live weight of sea turtle Archelon ischyros is more than 4,500 lb (2,200 kg).

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Introducing an impressive marine mammal that is primarily a nocturnal scavenger. Although largely unknown, the brown hyena (Parahyaena brunnea) is a top marine predator of fur seals at Bakers Bay, Namibia. 📷: Luderitz Marine Research

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Marine mammals have high levels of consciousness. As so, what could this spotted seal (Phoca largha) be thinking about as it makes eye to eye contact with a human? Based on its appearance, perhaps its thoughts are akin to be graceful. 📷: Beringia National Park

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Deep-sea spider crab Scyramathia tenuipes sp. nov., an inhabitant of the western Mediterranean Sea from depths of 572-819 m (1,877-2,687 ft); the size of the holotype male carapace is 34×26 mm or 13×9 inches; characterized by its slender and elongate ambulatory legs

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A chimaera close-up at ~3,000 ft (914 m) depth, between Florida and Cuba. Chimaeras, also known as ghost sharks, are about 50 species of cartilaginous fish that are closely related to sharks, skates and rays. The dots on its head are electroreceptors used for prey detection. 📷:NOAA

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Extremely colorful and endothermic, this large-eyed fish is known as an opah (aka moonfish, sunfish, kingfish). The six species of opah (Lampris spp.) inhabit the open oceans and are known to school with tuna. Who is familiar with this fish and from what part of the world? 📸: Ralph Pace

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Baby undulate rays (Raja undulata), an endangered species, measuring about 10 cm (3.9 in) and born at the Sea Life London Aquarium's breeding program

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Close-up view into the porous body structure of a deep-sea sponge – also nice refuges for several brittle stars and a supreme-looking shrimp

3yr ⋅

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This large pelagic jellyfish, Nemopilema nomurai (Cnidaria, Scyphozoa), can reach 2 m (6.6 ft) in diameter. Also weighing up to 200 kg (440 lb), the giant jellyfish species is commonly named as Nomura's jellyfish and it is one of the largest jellyfish in the world. 📷: PBS

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The monkfish Lophius piscatorius (Lophiidae - anglerfishes) can live for more than 20 years

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