Neognathostomata

Neognathostomata Temporal range: Lower Jurassic–recent PreꞒ Ꞓ O S D C P T J K Pg N
Echinocyamus pusillus
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Infraclass:	Irregularia
Superorder:	Neognathostomata Smith, 1981
Orders
Cassiduloida Clypeasteroida

The Neognathostomata are a superorder of sea urchins.

Description and characteristics[]

They are distinguished from other sea urchins by their irregular shape and a highly modified feeding lantern. The group includes the well known sand dollars, as well as some less familiar and extinct forms.

Taxonomy[]

Test of a Clypeaster reticulatus ().

("sand dollar").

Fossil of an ().

• familia Apatopygidae Kier, 1962
• familia Cotteau & Triger, 1869 †
• order Cassiduloida
  • Super-familia (Philip, 1963b)
    • familia Cassidulidae (L. Agassiz and Desor, 1847)
  • Super-familia (Philip, 1963b)
    • familia Neolampadidae (Lambert, 1918a)
    • familia (Kier, 1962) †
• order Clypeasteroida A.Agassiz, 1872 ("sand dollars")
  • sous-order
    • familia Clypeasteridae L. Agassiz, 1835
    • familia Philip & Foster, 1971 †
    • familia Irwin, 1995 †
  • familia von Zittel, 1879 †
  • familia Faujasiidae Lambert, 1905 †
  • familia Duncan, 1889 †
  • familia Lambert, 1905 †
  • sous-order
    • infra-order
      • familia Echinocyamidae Lambert & Thiéry, 1914
      • familia Fibulariidae Gray, 1855
      • familia Laganidae Desor, 1858
    • infra-order
      • familia Echinarachniidae Lambert in Lambert & Thiéry, 1914
      • familia Durham, 1955 †
      • familia Durham, 1955 †
      • familia Rotulidae Gray, 1855
      • super-familia Gray, 1825
        • familia Durham, 1955 †
        • familia Astriclypeidae Stefanini, 1912
        • familia Dendrasteridae Lambert, 1900
        • familia Mellitidae Stefanini, 1912
        • familia Lahille, 1896 †
        • familia Durham, 1955 †
        • familia Scutellidae Gray, 1825
      • familia Taiwanasteridae Wang, 1984
    • familia Pomel, 1888a †
• familia Clypeidae Lambert, 1898 †
• familia Clypeolampadidae Kier, 1962 †
• order
  • familia Echinolampadidae Gray, 1851a
• familia L. Agassiz & Desor, 1847 †
• familia Lambert, 1905 †
• genus Saucède, Dudicourt & Courville, 2012 †

References[]

• Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
• Kroh A, Mooi R (eds.). "Neognathostomata". World Echinoidea Database. World Register of Marine Species.

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