海座星（edrioasteroids），又稱座海星，是一類已滅絕的棘皮動物，生存於寒武紀中期至二疊紀。海座星營固着濾食生活，無莖（Column），身體扁平，球形或圓柱形，從背部中央的口輻射出的五條步帶溝是海座星的典型特徵，步帶溝里長有特殊的管足，用來輸送食物到口中。
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海座星在棘皮動物門中的具體分類地位尚無共識，有文獻將海座星綱歸入海膽亞門[1][2][3][4]，也有資料將其歸入海百合亞門[5]，還有假說認為海座星綱是棘皮動物較早分化的幹群，不屬於任何亞門。[6][7][8]
屬及種
僅列出部分屬。
- ?Arkarua
- Walcottidiscus（最古老的海座星，來自於中寒武紀的伯吉斯頁岩）
- W. typicalus
- Stromatocystites
- S. pentangularis
- S. reduncus
- S. walcotti
- Kailidiscus
- K. chinensis
- 海座星屬 Edrioaster（模式屬）
- E. bigsbyi
- E. priscus
- Edriophus
- E. levis
- Paredriophus
- P. elongatus
- Totiglobus
- T. nimius
- T. lloydi
- Cambraster
- C. cannati
- C. tastudorum
- Edriodiscus
- E. primotica
- Lebedodiscus
- 費氏海座星屬 Foerstediscus
- F. grandi
- F. splendens
- Cystaster
- C. stellatus
- Cryptogoleus
- C. chapmani
- Bellochthus
- Streptaster
- S. vorticellatus
- Cryptogoleus
- C. chapmani
- Carneyella
- C. pilea
- C. faberi
- C. ulrichi
- Isorophus
- I. cincinnatiensis
- Isorophusella
- 海蒲團屬 Camptostroma
- C. roddyi
- Rectitriordo
- Agelacrinites
- Krama
- K. devonicum (Bassler), 1936
- Parakrama
- Hemicystites
- H. bohemica
- H. chapmani
- H. devonicus
- Neoisorophusella
- N. lanei
- N. berryi
- N. maslennikovi
- N. whitesidei
- Curvitriordo
- Thresherodiscus
- T. ramosa (Foerste, 1914)
- Postibulla
- P. westergaardi
- Parapostibulla
- P. belli
- P. graysoni
- Eopostibulla
- Pyrgopostibulla
- Yorkicystis
- Torquerisediscus
- Cooperidiscus
- Dynocystis
- Stalticodiscus
- Ulrichidiscus
- Clavidiscus
- Discocystis
- Hypsiclavus
- Spiraclavus
- Giganticlavus
- Lispidecodus
- L. plinthotus (Kesling, 1967)
參考文獻
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