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19th century illustration of a whale. Published in Systematischer Bilder-Atlas zum Conversations-Lexikon, Ikonographische Encyklopaedie der Wissenschaften und Kuenste (Brockhaus, Leipzig, 1875)
Berthellina citrina
A white nudibranch on a rock
Underwater photography beauty deep sea, red ascidiacea tunicate Halocynthia papillosa, yellow coral  orange sponge fish reef Sea life.   Scuba diver point of view
Nudibranch on Great Barrier Reef
Forsskål's Pleurobranch (Pleurobranchus forskalii) is a species of sea slug that is commonly found in the waters surrounding the Indo-Pacific region. This marine creature has a unique body shape that resembles a mushroom, with its flattened body and large, frilly mantle. Its vibrant coloration and intricate patterns make it a popular subject for underwater photographers and nature enthusiasts alike.
Chiton, Tripoplax regularis. on a rock at Salt Point State Park in Sonoma County, California.
Cuttlefish know as Spanish dancer Hexabranchus sanguineus
sea cucumber in the genus Holothuria. Holothuria sanctori
cassiopeia andromeda upside down jellysfish kapoposang diver
White nudibranch eggs.  Close up Abstract.  Exploring and enjoying Beautiful Sea Life macro .  Underwater scene at clear mediterranean sea.  Scuba diver point of view. Greece Europe. Underwater photography
Pseudobiceros Bedfordi - Bedford's flatworm - Persian carpet flatworm - Pseudocerotidae on coral reef of Maldives.
Triton Epaulette Shark Hemiscyllium henryi occurs in the Western Pacific and is known only from western New Guinea (Papua Barat Province), Indonesia in a depth range from 3-30m, max. length 82cm. in 2020 the species has been assessed for the IUCN Red List of Threatened Species as vulnerable. \nThe double-ocellus marking on middle of side, just behind the head, is unique. \nThe species is often seen resting on the bottom, but occasionally it can also be seen swimming slowly or walking across the bottom using its pectoral and pelvic fins. The Triton's epaulette shark is generally sedentary during the day, seeking shelter under ledges or table corals. \n\nThis specimen was encountered by night at 3m depth, hidung under a rock and behind funnel weed, with a Blacktip Grouper Epinephelus fasciatus (with a cleaner shrimp on the head) on top. This fish is rarely longer than 25cm (max 40cm). Obviously the shark is a small animal too. \n\nTriton Bay, Kaimana Regency, Indonesia, 3°56'18.2099 S 134°7'10.8768 E at 3m depth
Digitally restored from a late 19th Century encyclopedia.
Psolus chitonoides, also known as the slipper sea cucumber, armoured sea cucumber, creeping armoured sea cucumber, or creeping pedal sea cucumber. Monterey County, California. Underwater.
Spanish Dancer Nudibranch, Hexabranchus sanguineus, Gneerings Reef, Mooloolaba, Queensland, Australia, South Pacific Ocean
Colorful sea cucumber-like corals.
Raw spotted sole fish isolated on white background
Foam on Water Surface Due to Water Pollution.
Pleurobranchus testudinarius, also known as the tortoise shell sea slug, is a species of sea slug, a marine gastropod mollusk in the family Pleurobranchidae.\n\nThe tortoise shell sea slug is a large species, reaching up to 20 cm in length. The body is broad and flattened, with a domed mantle that completely covers the foot. The mantle is brown or orange-red in color, with a pattern of white or pink rings. The body is covered with small tubercles. The rhinophores are long and slender, and the eyes are located on the tentacles. The foot is large and muscular, and is used for crawling.\n\nThe tortoise shell sea slug is a carnivorous species that feeds on colonial tunicates. It uses its radula to scrape away the tunicate's outer layer, exposing the soft tissues inside. The slug then injects the tunicate with a venom that paralyzes it. The slug then eats the soft tissues of the tunicate.\n\nThe tortoise shell sea slug is found in the Mediterranean Sea and the Atlantic Ocean, from Portugal to Morocco. It is also found in the Black Sea and the Sea of Marmara. The tortoise shell sea slug is a relatively common species, and is not considered to be endangered.
The dorid nudibranch Goniobranchus coi (former Chromodoris coi) occurs in the tropical Western Pacific. This specimen might be 4cm long. Kri Island, Raja Ampat, West Papua, Indonesia, 0°33'18\
A Galaxy Nudibranch (Cadlina sp-c) on the reef close up of the sea slug
Goldfish swimming in the water with a black background photographed in Chengdu
Sea slug - Pleurobranchus peronii. Underwater macro world of Tulamben, Bali, Indonesia.
Underwater Sea Life Nudibranch Scuba diver point of view
Sea slug redbrown nudibranch or redbrown leathery doris (Platydoris argo) undersea, Aegean Sea, Greece, Halkidiki
The Spanish dancer, scientific name Hexabranchus sanguineus (literally meaning \
Aplysia punctata is a species of sea slug in the family Aplysiidae, the sea hares. It reaches a length of up to 20 cm (7.9 in) and is found in the northeast Atlantic, ranging from Greenland and Norway to the Mediterranean Sea
Blue Striped Tunicate Rhopalaea circula occurs in the Western Central Pacific in a depth range from 6-18m. Tunicates do not have backbones, but they are vertebrates, why? At some point in their life cycle, they have a tail, a central nerve cord, a pharyngeal gill cleft and a notochord. Often mistaken for sponges, it's simple to test: Tunicates have two siphons and when disturbed, they can rapidly close them. Palau 7°6'55.26 N 134°16'11.96 E at 25m depth, deeper than the usually noted 18m maximum depth.
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