description Laganum laganum Overview
Laganum laganum is a species of flattened sand dollar belonging to the family Laganidae. Described by Leske in 1778, it serves as the type species for the genus Laganum. This marine invertebrate inhabits shallow waters across the Indo-Pacific region, where it burrows into sandy ocean floors. Like other sand dollars, it features a distinctive rigid test covered in tiny spines used for locomotion and feeding on organic detritus.
help Laganum laganum FAQ
Where are Laganum laganum sand dollars found?
Laganum laganum lives in the Indo-Pacific region, including waters around the Philippines, Indonesia, and northern Australia. It inhabits shallow sandy sea floors where it can partially bury itself. Like other sand dollars, it feeds on organic particles sifted from the sediment.
Who first described the species Laganum laganum?
The species was described by the German naturalist Nathanael Gottfried Leske in 1778. Leske's work built on earlier studies of echinoids and helped establish the classification of flattened sea urchins. Laganum laganum serves as the type species of its genus.
What makes Laganum laganum different from other sand dollars?
Laganum laganum has an extremely flattened, disc-shaped test (shell) typical of clypeasteroid echinoids, and it belongs to the family Laganidae. As the type species of the genus Laganum, it serves as the reference point for defining the genus's anatomical characteristics. It is distinguished from related genera by specific features of its petalodium, the flower-shaped pattern on its upper surface.
Can you find fossils of Laganum laganum?
While Laganum laganum is a living species, related fossil species within the family Laganidae are known from Cenozoic marine deposits across the Indo-Pacific. The genus has a long evolutionary history in warm, shallow marine environments. Fossil clypeasteroids in general are important index fossils for dating sedimentary layers.
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