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Top view of longtail tadpole shrimp, Triops longicaudatus, on sand background. Called a living fossil as the species having the same morphology for 70 million years.

Fish Pesce San Pietro

An illustration of Eurypterids (Sea Scorpions) swimming on a Silurian Period seafloor 418 million years ago.

Fish skeleton on black background

Close-up of the face of a large snapping turtle lying underwater. In the zoo's aquarium, a snapping turtle lies motionless. The snapping turtle is indistinguishable from rocks in an aquarium..

Dendrochirus barberi, Hawaiian green lionfish, Maui Island,

Monotomidae, Coleoptera Fossil in Burmese amber of Cenomanian era, 100 million years ago, from the state of Myanmar, extreme macro shot

Daphnia microscopic aquatic animal

African Pyxie bullfrog green and big

deathwatch beetle imprisioned in amber from Bitterfeld, Germany

A fish The three-spined stickleback (Gasterosteus aculeatus) on the background of a 5 mm measurement grid. Ichthyology research.

Great Silver Water Beetle (Hydrophilus piceus)

Phylym Platyhelmenthes or flat worms.

Axolotl

Computer generated 3D illustration with an ammonoid

Extreme close up of Octopus eye and skin texture, macro underwater photography. Australia.

Fish Pesce San Pietro

albino frog

An illustration of Eurypterids gathering on a seafloor. Eurypterids are related to arachnids and include the largest known arthropods to have ever lived. They were formidable predators that thrived in warm shallow water, in both seas and lakes, from the mid Ordovician to late Permian (460 to 248 million years ago).

The three-spined stickleback (Gasterosteus aculeatus)

Photo of Tripletail, a juvenile saltwater fish, against a black background.

Aquatic (fresh water) nematode living in pond water among cyanobacteria. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.

Gyrodactylus is ectoparasitic flatworms infections in fish.

Goldfish swimming in the water with a black background photographed in Chengdu

Fish Pesce San Pietro

Horizontal high angle photo of a flat bodied stingray with a venomous sting on its tail swimming along close to the sand in the clear shallow estuary water at Dolphin Point near Ulladulla, south coast NSW in Summer.

Dreissena is a genus of small freshwater mussels in the family Dreissenidae in the class Bivalvia. They are found attached to firm substrates by threads from underneath the shells and are the only freshwater bivalves to attach to hard substrates in high densities while having a planktonic larval stage.

Trombidium holosericeum Mite. Digitally Enhanced Photograph.

Demodex parasite under the skin in dog take a photo from microscope

Hexagrammos lagocephalus is a colorful marine fish with the common name rock greenling in the greenling family.

Free Images: "bestof:MicrocerculusSquamulatusSmit.jpg Microcerculus marginatus squamulatus Proceedings of the Zoological Society of London 1875 http //www archive org/stream/..."

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