A study led by researchers at Scripps Institution of Oceanography at UC San Diego provides new insight on the origins and early evolution of echinoids, a group of marine animals that includes modern ...
Thompson is the author of "Fossil Echinoids of Texas," a new book that catalogues all the currently known 237 fossil sea urchins, sand dollars, heart urchins and sea biscuits from Texas. Thompson owns ...
New work on echinoids -- marine animals like sea urchins and sand dollars -- gives scientists a reason to rethink a classical pattern of evolution. Fossil-based studies have traditionally indicated ...
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THE Echinoidea afford probably greater opportunities for accurate phylogenetic study than any other class of animals. This is due to the fact that a fossil Echinoid is, when well preserved, often as ...
According to the researchers, the findings show that sea urchins appeared on Earth long (about 50 million years) before the date generally accepted by scientists The study points to a variety of ...
Ambulacral plating simple or incipient pseudocompound at most; Perignathic girdle absent, or with feeble muscle attachment points at median and adradial edges of interambulacral zones. Kier (1984) ...
The echinoids are described from the middle Eocene Warley Hill Formation, Santee Limestone, and Castle Hayne Limestone of North and South Carolina. Twenty-seven species are present including the ...
The oldest echinoids come from the Late Ordovician Period and are approximately 450 million years old. The closest sister group to the echinoids are the holothurians and the two groups must have ...
New insight on the origins and early evolution of echinoids, a group that includes the sea urchins, the sand dollars, and their relatives, has been published today in the journal eLife. The study ...
New insight on the origins and early evolution of echinoids, a group that includes the sea urchins, the sand dollars, and their relatives, has been published. New insight on the origins and early ...
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