Carabian Sea, Dominican Republic, Cuba, Haiti, Venezuela, etc
Trichius rosaceus was created in 1769.
Oxycanus rosaceus was created in 1935.
A cake urchin is any of a variety of echinoderms of the genus Clypeaster.
Genus and species is Clypeaster subdepressus
Quite common in cliffs just below Williams Parade Bairnsdale in layers exposed by river erosion. - thewhitefly
The sand dollar (Clypeaster sp. Family Clypeasteridae) a flat, round type of sea urchin, is specially adapted to burrowing in sand. The star shape is due to its set of five pores arranged in a petal-like pattern through which it moves sea water into its internal water-vascular system. It's the latter that allows the sand dollar to move about. A link is provided below.
Surprisingly, the actual name for a group of sand dollars is "a fortune." The term "sand dollar" refers to the round flat shape of the rigid endoskeleton which apparently reminded American sailors and sea-farers of a large coin when they spoted them washed up on beaches, bleached a dazzling white by the sun. This comparison to coinage and money led to the eventual use of the term "fortune" to describe a large group of these marine animals, which can congregate by the hundreds on sandbars just below the surface of the sea floor.
William Benjamin Carpenter has written: 'On Tomopteris onisciformis, Eschscholtz' -- subject(s): Anatomy, Annelida 'Mesmerism, spiritualism, &c., historically & scientifically considered, 2 lectures: Historically ..' 'The microscope and its revelations' -- subject(s): Natural history, Microscopy, Microscope and microscopy, Microscopes, Biology 'Mesmerism, spiritualism, &c' -- subject(s): Mesmerism, Spiritualism 'Nature and man' -- subject(s): Evolution, Man, Psychology, Human beings, Science 'The Microscope and its revelations. v. 2' 'Principles of human physiology' -- subject(s): Physiology, Human physiology 'Epidemic delusions' -- subject(s): Delusions 'Vegetable physiology and botany' -- subject(s): Anatomy, Botany, Physiology 'The microscope and its revelations' -- subject(s): Microscopes, Microscopy/, Biology, Microscopy 'Principles Of Human Physiology V2' 'Principles of general and comparative physiology' -- subject(s): Comparative Physiology, Plant physiology, Animals, Physiology, Plant Physiological Phenomena 'Researches on the structure, physiology and development of Antedon (Comatula, Lamk.) rosaceus' -- subject(s): Echinodermata 'Researches on Foraminifera' 'On the temperature and animal life of the deep sea' -- subject(s): Deep-sea temperature, Marine fauna, Porcupine (Ship) 'Elements of physiology' -- subject(s): Human anatomy, Human physiology, Physiology, Anatomy 'Zoology' -- subject(s): Zoology