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Sand dollars diverged from the other irregular echinoids, namely the cassiduloids, during the early Jurassic, [5] with the first true sand dollar genus, Togocyamus, arising during the Paleocene. Soon after Togocyamus, more modern-looking groups emerged during the Eocene. [1] Sand dollars are small in size, averaging from 80 to 100 mm (3 to 4 ...
Heliophora orbicularis, also known as the West African Sand Dollar, is a small sand dollar in to the family Rotulidae, and the only species in the genus Heliophora. It, and other members of Rotulidae have been found in West African marine strata from the Late Miocene onward.
Rotulidae is a family of small sand dollars native to the Atlantic coast of Africa, with 3 genera, with Rotula and Heliophora being extant, the other, Rotuloidea, being extinct since the Pliocene, but all three being found in the fossil record along the Atlantic African coast since the Miocene.
Clypeasteridae is a family of sea urchins in the order Clypeasteroida.This family was first scientifically described in 1835 by the Swiss-American biologist Louis Agassiz.. The clypeasteridae also known as the sand dollar, are round and semi-flat organisms with spines lining the underside of the body and elongated genital papillae aiding its survival and reproduction.
Echinarachnius parma, the common sand dollar, is a species of sand dollar native to the Northern Hemisphere. [1] Subspecies. Echinarachnius parma obesus H.L. Clark, 1914;
Sand mandala (Tibetan: དཀྱིལ་འཁོར།, Wylie: dkyil 'khor, THL kyinkhor; Chinese: 沙壇城/壇城沙畫) is a Tibetan Buddhist tradition involving the creation and destruction of mandalas made from colored sand.
While it's something that nearly all Americans have come into contact with, there remains an enormous shroud of mystery around many of the bill's markings.
The “science of the sand” (‘ilm al-raml), otherwise translated as geomancy, is “based on the interpretation of figures traced on sand or other surface known as geomantic figures.” [32] It is a good example of Islamic divination at a popular level. The core principle that meaning derives from a unique occupied position is identical to ...