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Jacksonaster depressum (L. Agassiz, 1841)
A living sand dollar is covered with fine spines and appears velvety. The skeleton of a dead sand dollar is smooth, without any spines, and the details of skeleton can be seen more clearly.
Can be found on or in soft silty sand in sheltered lagoons near reefs.
Synonymised names:
Jacksonaster conchatus (M'Clelland, 1840) (subjective junior synonym)
Laganum attenuatum L. Agassiz in L. Agassiz & Desor, 1847a (subjective junior synonym)
Laganum conchatum (Lambert & Thiéry, 1914) (subjective junior synonym)
Laganum depressum L. Agassiz, 1841 (transferred to Jacksonaster)
Laganum depressum sinaitica Fraas, 1867 (subjective junior synonym)
Laganum depressum var. sinaitica Fraas, 1867 (Infrasubspecific taxon that is to be treated as a subspecies according to ICZN 4th Ed. Article 45.6.4)
Laganum dyscritum H.L. Clark, 1932 (subjective junior synonym)
Laganum ellipticum L. Agassiz, 1841 (subjective junior synonym)
Laganum sinaiticum Fraas, 1867 (subjective junior synonym)
Laganum tumidum Duncan & Sladen, 1886 (subjective junior synonym)
Direct children (5):
Subspecies Jacksonaster depressum alienum (Mortensen, 1948)
Subspecies Jacksonaster depressum delicatum (Mazzetti, 1894)
Subspecies Jacksonaster depressum depressum (L. Agassiz, 1841)
Subspecies Jacksonaster depressum tenue (Mortensen, 1948)
Subspecies Jacksonaster depressum tonganense (L. Agassiz, 1841)
A living sand dollar is covered with fine spines and appears velvety. The skeleton of a dead sand dollar is smooth, without any spines, and the details of skeleton can be seen more clearly.
Can be found on or in soft silty sand in sheltered lagoons near reefs.
Synonymised names:
Jacksonaster conchatus (M'Clelland, 1840) (subjective junior synonym)
Laganum attenuatum L. Agassiz in L. Agassiz & Desor, 1847a (subjective junior synonym)
Laganum conchatum (Lambert & Thiéry, 1914) (subjective junior synonym)
Laganum depressum L. Agassiz, 1841 (transferred to Jacksonaster)
Laganum depressum sinaitica Fraas, 1867 (subjective junior synonym)
Laganum depressum var. sinaitica Fraas, 1867 (Infrasubspecific taxon that is to be treated as a subspecies according to ICZN 4th Ed. Article 45.6.4)
Laganum dyscritum H.L. Clark, 1932 (subjective junior synonym)
Laganum ellipticum L. Agassiz, 1841 (subjective junior synonym)
Laganum sinaiticum Fraas, 1867 (subjective junior synonym)
Laganum tumidum Duncan & Sladen, 1886 (subjective junior synonym)
Direct children (5):
Subspecies Jacksonaster depressum alienum (Mortensen, 1948)
Subspecies Jacksonaster depressum delicatum (Mazzetti, 1894)
Subspecies Jacksonaster depressum depressum (L. Agassiz, 1841)
Subspecies Jacksonaster depressum tenue (Mortensen, 1948)
Subspecies Jacksonaster depressum tonganense (L. Agassiz, 1841)