• Thumbnail for Clypeasteridae
    Clypeasteridae is a family of sea urchins in the order Clypeasteroida. This family was first scientifically described in 1835 by the Swiss-American biologist...
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  • Thumbnail for Sand dollar
    Echinarachniidae). Mellita quinquiesperforata test (Clypeasteridae) Clypeaster reticulatus test (Clypeasteridae) Echinodiscus tenuissimus test (Astriclypeidae)...
    15 KB (1,570 words) - 03:51, 6 July 2024
  • Thumbnail for Clypeaster rosaceus
    rosaceus, the fat sea biscuit, is a species of sea urchin in the family Clypeasteridae. It occurs in shallow water in the western Atlantic Ocean and was first...
    4 KB (432 words) - 21:45, 4 December 2023
  • Thumbnail for Clypeaster
    Clypeaster (category Clypeasteridae)
    or "sea biscuits", is a genus of echinoderms belonging to the family Clypeasteridae. The genus name Clypeaster is derived from the Latin “clypeus” (meaning...
    5 KB (332 words) - 21:33, 4 December 2023
  • Thumbnail for Clypeaster japonicus
    the Japanese sea biscuit, is a species of sea urchin in the family Clypeasteridae. This species was first scientifically described in 1885 by the German...
    2 KB (244 words) - 21:43, 4 December 2023
  • Thumbnail for Clypeaster reticulatus
    the reticulated sea biscuit, is a species of sea urchin in the family Clypeasteridae. This species was first scientifically described in 1758 by Carl Linnaeus...
    4 KB (304 words) - 23:48, 24 April 2024
  • Thumbnail for Clypeaster cyclopilus
    Clypeaster cyclopilus is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster cyclopilus was first scientifically...
    1,019 bytes (66 words) - 21:39, 4 December 2023
  • Thumbnail for Clypeaster humilis
    Clypeaster humilis is a species of sea urchin in the family Clypeasteridae. This species was first scientifically described in 1778 by the German biologist...
    3 KB (237 words) - 21:42, 4 December 2023
  • Thumbnail for Clypeaster australasiae
    Australasian sand dollar, is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster australasiae was first...
    2 KB (170 words) - 03:12, 21 April 2024
  • Thumbnail for Clypeaster subdepressus
    Clypeaster subdepressus is a species of sea urchin in the family Clypeasteridae. This species was first scientifically described in 1825 by the British...
    2 KB (132 words) - 15:27, 16 April 2024
  • Thumbnail for Clypeaster chesheri
    Clypeaster chesheri is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster chesheri was first scientifically...
    821 bytes (54 words) - 21:39, 4 December 2023
  • Thumbnail for Echinarachnius parma
    Mortensen, T. (1948). A Monograph of the Echinoidea. IV, 2. Clypeasteroida. Clypeasteridæ, Arachnoidæ, Fibulariidæ, Laganidæ and Scutellidæ. 471 pp., C. A. Reitzel...
    5 KB (516 words) - 15:18, 27 May 2023
  • Sri Lanka is a tropical island situated close to the southern tip of India. The invertebrate fauna is as large as it is common to other regions of the...
    23 KB (2,211 words) - 00:20, 11 December 2023
  • Clypeaster annandalei is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster annandalei was first scientifically...
    791 bytes (54 words) - 21:36, 4 December 2023
  • Thumbnail for Clypeaster euclastus
    Clypeaster euclastus is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster euclastus was first scientifically...
    842 bytes (56 words) - 21:41, 4 December 2023
  • Thumbnail for Irregularia
    A "sand dollar" in its environment. Clypeaster reticulatus (family Clypeasteridae). Encope emarginata (aboral and oral faces) drawn by Ernst Haeckel (1904)...
    5 KB (316 words) - 23:43, 6 February 2024
  • Clypeaster amplificatus is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster amplificatus was first...
    801 bytes (54 words) - 21:35, 4 December 2023
  • Clypeaster aloysioi is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. C. aloysioi was first scientifically...
    810 bytes (54 words) - 21:36, 4 December 2023
  • Clypeaster durandi is a species of sea urchins of the Family Clypeasteridae. Their armour is covered with spines. Clypeaster durandi was first scientifically...
    1 KB (74 words) - 21:40, 4 December 2023
  • Clypeaster elongatus is a species of sea urchins of the family Clypeasteridae. Their armour is covered with spines. Clypeaster elongatus was first scientifically...
    797 bytes (56 words) - 21:41, 4 December 2023
  • Thumbnail for Neognathostomata
    Clypeasteroida A.Agassiz, 1872 ("sand dollars") suborder Clypeasterina family Clypeasteridae L. Agassiz, 1835 family Fossulasteridae Philip & Foster, 1971 † family...
    4 KB (259 words) - 08:17, 6 April 2023
  • Thumbnail for Ammotrophus arachnoides
    Ammotrophus arachnoides (category Clypeasteridae)
    Phylum: Echinodermata Class: Echinoidea Order: Clypeasteroida Family: Clypeasteridae Genus: Ammotrophus Species: A. arachnoides Binomial name Ammotrophus...
    1 KB (76 words) - 05:36, 2 August 2024
  • Ammotrophus cyclius (category Clypeasteridae)
    Ammotrophus cyclius is a species of sand dollar of the family Clypeasteridae. Their external skeleton, known as a test, is covered with spines. It belongs...
    1,001 bytes (76 words) - 21:14, 10 June 2022
  • Thumbnail for Fellaster
    Fellaster (category Clypeasteridae)
    Fellaster is a genus of echinoderms belonging to the family Clypeasteridae. The species of this genus are found in Australia and New Zealand. Species:...
    844 bytes (45 words) - 07:09, 2 August 2024
  • Thumbnail for Arachnoides tenuis
    Arachnoides tenuis (category Clypeasteridae)
    Arachnoides tenuis is a species of sea urchin of the family Clypeasteridae. Their armour is covered with spines. It is placed in the genus Arachnoides...
    966 bytes (70 words) - 21:31, 4 December 2023
  • Thumbnail for Arachnoides placenta
    Arachnoides placenta (category Clypeasteridae)
    Arachnoides placenta is a species of sea urchin of the family Clypeasteridae. Their armour is covered with spines. It is placed in the genus Arachnoides...
    1 KB (67 words) - 21:32, 4 December 2023
  • Thumbnail for Arachnoides
    Arachnoides (category Clypeasteridae)
    Arachnoides is a genus of sea urchin within the family Clypeasteridae, found in the Indo-Pacific oceans. The base is flat and the upper surface is convex...
    2 KB (108 words) - 21:30, 4 December 2023
  • Thumbnail for Fellaster zelandiae
    Fellaster zelandiae (category Clypeasteridae)
    Phylum: Echinodermata Class: Echinoidea Order: Clypeasteroida Family: Clypeasteridae Genus: Fellaster Species: F. zelandiae Binomial name Fellaster zelandiae...
    1 KB (75 words) - 09:44, 24 April 2022
  • Ammotrophus platyterus (category Clypeasteridae)
    Ammotrophus platyterus is a species of sand dollar of the family Clypeasteridae. Their armour is covered with spines. It came from the genus Ammotrophus...
    932 bytes (68 words) - 21:13, 10 June 2022
  • Thumbnail for Ammotrophus
    Ammotrophus (category Clypeasteridae)
    Ammotrophus is a genus of echinoderms belonging to the family Clypeasteridae. The species of this genus are found in Australia. Species: Ammotrophus arachnoides...
    1,011 bytes (60 words) - 05:34, 2 August 2024