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, or the five-hole sand dollar, is a flat irregular sea urchin distinguished by the five characteristic lunules in its test.

Echinocorys scutata is a holasterid fossil sea urchin in a Late Cretaceous to Paleocene genus found across Europe, Asia, Australia, and North America.

Clypeaster subdepressus is a species of sea biscuit, a type of irregular sea urchin in the family Clypeasteridae, notable for its distinctively flattened shape.

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 large, heavy species of sea biscuit urchin first described by Carl Linnaeus in 1758 and native to the Caribbean marine environment.

The sea potato is a burrowing heart urchin found in the coastal sandy sediments of Europe and Australasia, distinguished by its heart-shaped, dense yellowish-spined skeletal test.

Spatangus purpureus is the purple heart urchin, a Spatangidae species described by O.F. Muller in 1776 and found in the eastern Atlantic and Mediterranean.

Encope emarginata is a species of sea urchin belonging to the family Mellitidae, recognized by its distinctive notched edges and flattened, disk-like test.

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 flat, disk-like irregular sea urchin in the family Arachnoididae, primarily inhabiting the shallow coastal waters of the Indo-Pacific.

NGC 1501, the Oyster Nebula, is a complex planetary nebula located in the constellation Camelopardalis, discovered by William Herschel in 1787.

Rotula deciesdigitatus is a distinctive irregular sea urchin known for its star-shaped body and the unique, digitate (finger-like) structure of its ambulacral petals.

Conulus albogalerus is an extinct irregular sea urchin of Cretaceous chalk deposits, notable as a familiar collected fossil in that group.

Echinoneus cyclostomus is a species of sea urchin belonging to the family Echinoneidae, first described by naturalist Nathanael Gottfried Leske in 1778.

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 tropical Indo-Pacific heart urchin in Loveniidae, described by Gray in 1845 and often found buried in sediment.

Echinocyamus pusillus is the pea urchin, a tiny Fibulariidae sand dollar described by O.F. Muller in 1776 from the northeast Atlantic and Mediterranean.

Galerites albogalerus is a historical name for an extinct Cretaceous chalk sea urchin, notable for taxonomic overlap with Conulus albogalerus.

Mellita longifissa is a species of sand dollar in the family Mellitidae, notable for its extremely long posterior lunule and Eastern Pacific coastal range.

Plagiobrissus grandis is a large western Atlantic Brissidae sea urchin described by Gmelin in 1791 and found from Florida through the Caribbean to Brazil.

Discoides subuculus is an extinct Cretaceous irregular sea urchin, notable as a chalk echinoid species traditionally attributed to Leske in 1778.

Fellaster zelandiae is an irregular sea urchin of the family Echinoneidae that is endemic to the coastal marine waters surrounding the country of New Zealand.

Schizaster canaliferus is an older name for Ova canaliferus, a Mediterranean schizasterid described by Lamarck in 1816 with a complete latero-anal fasciole.

Slub cotton is a fabric woven or knit from slub yarn—thread with intentional thick-and-thin variations—giving the finished textile a naturally irregular, textured appearance.

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...