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Scientific Name: Jacksonaster depressum Lesson, 1841 (L. Agassiz, 1841)

Synonym: Laganum depressum (Currently unaccepted)

English Name: Sand dollars, Sea biscuits, Cake urchins
Local/Bangla Name: Samudra urchin (সমুদ্র আর্চিন)
Sand dollars, Sea biscuits, Cake urchins - Samudra urchin (সমুদ্র আর্চিন) - Jacksonaster depressum - Type: Sea_urchin

Photo: Claire Goiran

Classification:
Kingdom: Animalia
Phylum: Echinodarmata
Class: Echinoidea
Order: Echinolampadacea
Family: Laganidae
Description:
The shape of this structure can vary from oval to pentagonal, and its edge may exhibit differing thickness. The apical disc features five gonopores, and there are hydropores located within the sinuous groove. The petal-like parts are robust and taper towards their outer ends. The basicoronal plates are arranged in a star-like pattern, with ambulacral plates that project outward. The periproct is positioned in the oral region and has a radial elongation, located between the peristome and the back edge, opening between the first and second paired post-basicoronal plates.
Habitat & Distribution in Bangladesh:
Bay of Bengal, Bangladesh
Environment:
Marine
Main References:

KABIR SMH, AHMED M, AHMED ATA, RAHMAN AKA, AHMED ZU, BEGUM ZNT, HASSAN MA, KHONDKER M (EDS.) 2009. Encyclopedia of flora and fauna of Bangladesh, Vol. 16. Annelida Echainodermata Acanthocephala and Minor Phyla.. Asiatic Society of Bangladesh, Dhaka. 232 pp.

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