Best Irregular

Dendraster excentricus, commonly called the eccentric sand dollar, is an irregular sea urchin native to sandy habitats along the Pacific coast of North America. Its common name refers to the off-center position of the petal-like pattern on the upper surface of its flattened test. Living individuals...

Springbok's Coastal Sunset puzzle captures the serene beauty of a sunset over the ocean. The puzzle features a vibrant color palette and a detailed depiction of the coastline. Springbok is known for its unique, irregularly shaped pieces, which add an extra layer of challenge and interest. The image...

Echinarachnius parma, commonly known as the sand dollar, is a species of flat, burrowing sea urchin belonging to the order Clypeasteroida. It is widely distributed across the Northern Hemisphere, inhabiting the sandy or muddy bottoms of temperate and boreal ocean waters. This invertebrate exhibits t...

Echinocardium cordatum, commonly known as the heart urchin or sea potato, is a species of burrowing sea urchin in the family Loveniidae. First described by Thomas Pennant in 1777, it inhabits sandy substrates in the northeastern Atlantic Ocean and Mediterranean Sea. Unlike regular sea urchins, it ha...

Mellita quinquiesperforata, commonly known as the five-hole sand dollar, is a flat irregular sea urchin belonging to the family Mellitidae. It is distinguished by the five characteristic, keyhole-like lunules that pierce its rigid skeleton, or test. This species is found along the sandy coastal wate...

Echinocorys scutata is an extinct species of irregular sea urchin that existed during the Late Cretaceous to Paleocene periods. As a holasterid echinoid, it possessed the flattened, heart-shaped or scutate test characteristic of its group, adapting it to a burrowing lifestyle in soft marine sediment...

Clypeaster subdepressus is a species of sea biscuit, a type of irregular sea urchin belonging to the family Clypeasteridae. Like other sea biscuits, it is notable for its heavily flattened, disk-like shape and dense covering of short spines, an adaptation that differs significantly from the spherica...

Clypeaster japonicus is a species of sea biscuit, an irregular type of flattened sea urchin belonging to the family Clypeasteridae. First described by the German zoologist Ludwig Döderlein in 1885, the marine invertebrate is native to the coastal waters of Japan. Like other sea biscuits, it burrows...

Clypeaster rosaceus is a species of irregular sea urchin, commonly referred to as a sea biscuit, belonging to the Clypeasteridae family. First described by Carl Linnaeus in 1758, the species is characterized by its heavy, dome-shaped calcareous test and dense covering of short spines. It inhabits sh...

Echinocardium cordatum, commonly called the sea potato, is a species of irregular sea urchin in the order Spatangoida that burrows in sandy marine sediments. Its test is heart-shaped and covered in dense, fine yellowish spines that facilitate movement through sand. The species inhabits coastal water...

Spatangus purpureus is a species of irregular sea urchin in the family Spatangidae, first described by the Danish naturalist Otto Friedrich Müller in 1776. Commonly known as the purple heart urchin, it inhabits sandy and muddy seabeds in the eastern Atlantic Ocean and the Mediterranean Sea. Like oth...

Encope emarginata is a species of irregular sea urchin belonging to the family Mellitidae, a group commonly known as sand dollars. It is recognized by its flattened, disk-shaped test, which features distinctive notched edges and indentations along its borders. Like other sand dollars, this species l...

Meoma ventricosa is the red heart urchin, a large Caribbean Brissidae species described by Lamarck in 1816 and reaching about 20 cm across.

Arachnoides placenta is a species of irregular sea urchin, commonly known as a sand dollar or cake urchin, belonging to the family Arachnoididae. This marine invertebrate is characterized by its flat, disk-like morphology, which is an evolutionary adaptation that allows it to burrow efficiently into...

The Oyster Nebula (NGC 1501) is a planetary nebula located in the constellation Camelopardalis, approximately 4,200 light-years from Earth. Discovered by William Herschel in 1787, it consists of an expanding shell of ionized gas ejected by a dying star at its center. The nebula's complex, irregular...

Rotula deciesdigitatus is a distinctive species of irregular sea urchin belonging to the Clypeasteroida order, commonly known as sand dollars. It is recognized by its flattened, star-shaped test and the unique digitate, or finger-like, structure of its ambulacral petals. This marine invertebrate is...

Conulus albogalerus is an extinct species of irregular sea urchin that lived during the Late Cretaceous period. It is commonly found fossilized in marine chalk deposits across Europe, making it a familiar specimen among paleontologists and amateur fossil collectors. As an irregular echinoid, it poss...

Echinoneus cyclostomus is a species of irregular sea urchin in the family Echinoneidae, first described by German naturalist Nathanael Gottfried Leske in 1778. It is distributed in shallow marine waters of the tropical Indo-Pacific region. As an irregular echinoid, it is adapted to a burrowing lifes...

Clypeaster humilis is a species of irregular sea urchin, commonly known as a sea biscuit, belonging to the family Clypeasteridae. First described by naturalist Nathanael Gottfried Leske in 1778, the species thrives in shallow marine environments throughout the Indo-Pacific region. As an irregular ec...

Lovenia elongata is a species of heart urchin belonging to the family Loveniidae, first described by zoologist John Edward Gray in 1845. As an irregular echinoid, it has a bilateral rather than radial symmetry and is adapted for a burrowing lifestyle in soft marine sediments. The species is distribu...

Echinocyamus pusillus, commonly known as the pea urchin, is a small species of sand dollar belonging to the family Fibulariidae. Originally described by Danish naturalist O.F. Müller in 1776, this marine invertebrate inhabits the northeastern Atlantic Ocean and Mediterranean Sea. The pea urchin is d...

Galerites albogalerus is a scientific name historically assigned to an extinct species of irregular sea urchin that lived during the Cretaceous period. The fossil remains of this echinoid are commonly found in chalk deposits across Europe. In modern paleontology, the taxon is frequently regarded as...

Mellita longifissa is a species of irregular echinoid, commonly known as a sand dollar, belonging to the family Mellitidae. It is distinguished by its noticeably elongated posterior lunule, a keyhole-shaped opening in the organism's flattened test. This marine invertebrate is native to the Eastern P...

"Plagiobrissus grandis" is a species of large, irregular sea urchin belonging to the family Brissidae, commonly known as a heart urchin. Originally described by the German naturalist Johann Friedrich Gmelin in 1791, the species inhabits the western Atlantic Ocean. Its geographical range extends from...

Discoides subuculus is an extinct species of irregular sea urchin (echinoid) from the Cretaceous period, known primarily from chalk deposits in northwest Europe. As an irregular echinoid, it had a flattened, bilateral body form adapted to infaunal burrowing in soft seafloor sediments. The species is...

Fellaster zelandiae is a species of irregular sea urchin belonging to the family Echinoneidae, endemic to the coastal marine waters of New Zealand. Like other irregular echinoids, it possesses a somewhat flattened, bilateral body structure rather than the perfectly spherical shape of typical sea urc...

Schizaster canaliferus, also recognized historically under the name Ova canaliferus, is a species of irregular sea urchin belonging to the family Schizasteridae. Originally described by Lamarck in 1816, this marine invertebrate is native to the Mediterranean Sea. Like other heart urchins, it feature...

Slub cotton is a woven or knitted textile produced from yarn that features intentional, irregular variations in thickness. Historically, a "slub" referred to a defect created during the spinning process, but modern manufacturers purposely engineer these thick and thin sections to create a uniquely t...

Clypeaster australasiae is a species of sea biscuit, an irregular type of sea urchin in the family Clypeasteridae. First described by British zoologist William Elford Leach in 1815, these flattened echinoderms inhabit sandy substrates in the Indo-Pacific region. Like other sea biscuits, they are ada...