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The shingle urchin (Colobocentrotus atratus) is a species of sea urchin found in the Indo-Pacific region, particularly in areas exposed to heavy wave action. It is uniquely adapted to its harsh intertidal environment through its strongly flattened, dome-shaped test and modified, scale-like spines. T...
Colobocentrotus mertensi is a sea urchin in the family Echinometridae found across the Indo-Pacific in wave-swept intertidal zones. Its morphology is highly modified for surviving violent surf: the test is flattened and its primary spines are short, broad, and overlapping, giving the animal a shingl...
Colobocentrotus mertensii, commonly known as the shingle urchin, is a species of sea urchin in the family Echinometridae native to the Indo-Pacific, including Japan, Taiwan, and Hawaii. It inhabits rocky intertidal shores exposed to strong wave action. Unlike most sea urchins, its primary spines are...
Opisthoteuthis californiana is a deep-sea cephalopod commonly called a flapjack octopus and classified within the family Opisthoteuthidae. It has a soft, gelatinous body, a web connecting its arms, and a pair of small fins; when resting, its flattened form contributes to the common name. It inhabits...
Arachnoides placenta is a flat, disk-like irregular sea urchin in the family Arachnoididae, primarily inhabiting the shallow coastal waters of the Indo-Pacific.
Laganum depressum is a species of flat sand dollar found in the Indo-Pacific, belonging to the Laganidae family of irregular sea urchins.
A flapjack octopus found in the deep Pacific Ocean, recognized by its extremely flattened disc-like gelatinous body and short arms joined by extensive webbing.
Opisthoteuthis agassizii is a deep-sea flapjack octopus found in the Atlantic Ocean, described by Verrill in 1883 and named in honor of naturalist Louis Agassiz.
A flapjack octopus found in the deep North Atlantic, characterized by its highly flattened gelatinous body and broad arm webbing, typical of the family Opisthoteuthidae.
A deep-sea cirrate octopus first described from specimens collected during the Monaco-based Princesse Alice oceanographic expeditions of the late 19th century.
Opisthoteuthis chathamensis is a deep-sea cirrate octopus described from specimens collected near the Chatham Islands of New Zealand.
Opisthoteuthis extensa is a deep-sea flapjack octopus from the Pacific Ocean, named for its elongated body form relative to other members of the Opisthoteuthis genus.
A flattened, gelatinous deep-sea cirrate octopus (family Opisthoteuthidae) known from the Atlantic Ocean, characterized by extensive webbing between its short arms.
Opisthoteuthis massyae is a deep-sea cirrate octopus from the Atlantic Ocean, described in the early 20th century and known from limited deep-sea specimens.
The Walnut Orbweaver is a European species known for its exceptionally flattened body, an evolutionary adaptation that allows it to hide under loose bark.
