無洞貝屬

無洞貝屬（學名：），又名無窗貝屬，是無洞貝科無洞貝亞科下已滅絕的一個屬，於早古生代奧陶紀晚奧陶世（4.44億年前）至晚古生代石炭紀早石炭世（3.18億年前）開始出現，繁盛於志留紀和泥盆紀，存活至泥盆紀晚泥盆世（泥盆紀後期滅絕事件），廣泛存在於海洋岩石內的化石中。其分佈之廣泛，存在於除南極洲之外的所有大陸。牠們生活在淺海的鬆軟基質上。

 特徵 
在泥盆紀時的海床沉積裡，大多數物種的閥依然有發達的肉莖，只有很少數的雙閥。牠們的背殼比腹殼更為突出，並有寬而淺的皺褶。腹殼上有很小的凹陷和微曲的喙。兩殼前緣的閉合線稍朝著背殼彎曲。殼上有許多纖細而圓的肋和鮮明的同心生長紋。

 物種 
 無洞貝：泥盆紀中期，中國雲南，大小: 1.5x1.5 - 3x3cm
 湖南無窗貝：泥盆紀中期，中國，大小: 3 - 4cm
Atrypa devonianaAtrypa jukesii M'Coy, 1847Atrypa  at Fossilworks.orgAtrypa nevadana
Atrypa oklahomensisAtrypa oneidensis Beus, 1965Atrypa putilla
Atrypa reticularis Linnaeus, 1767 = Anemia reticularis, A. dzwinogrodensis

 重新分配的物種 
因為無洞貝屬是一個較早被建立的屬，因此其下有些物種現時已被置入其他的屬。
 A. arata = Pentamerella arata
 A. aspera var. occidentalis =  Spinatrypa occidentalis
 A. astuta = Felinotoechia astuta
 A. congregata = Camarotoechia congregata
 A. coralifera = Dictyonella coralifera
 A. depressa = Plagiorhyncha glassii
 A. dubia = Protorhyncha dubia
 A. elongata = Rensselaeria elongata
 A. exigua = Protozyga exigua
 A. extans = Triplesia extans
 A. flabellites = Leptocoelia propria
 A. gruenwaldtiaeformis = Nalivkinia gruenwaldtiaeformis
 A. hemiplicata = Parastrophina hemiplicata
 A. hemisphaerica = Eocoelia hemisphaerica
 A. hircina = Hircinisca hircina
 A. hirsuta = Parazyga hirsuta
 A. hystrix var. occidentalis =  Spinatrypa occidentalis
 A. increbescens = Rhynchotrema increbescens
 A. kolymensis = Vagrania kolymensis A. laevis = Meristella laevis
 A. lens = Stricklandia lens
 A. linguifera = Antirhynchonella linguifera
 A. medialis = Eatonia medialis
 A. modesta = Zygospira modesta
 A. nitens = Hisingerella nitens
 A. nitida = Whitfieldella nitida
 A. nucella = Lycophoria nucella
 A. obovata = Glassia obovata
 A. obtusiplicata = Pectorhyncha obtusiplicata
 A. peculiaris = Costellirostra peculiaris
 A. plebeia = Dicamara plebeia
 A. pleiopleura = Pleiopleurina pleiopleura
 A. prunum = Atrypella prunum
 A. recurvirostra = Zygospira recurvirostra
 A. scitula = Charionella scitula
 A. sordida = Cyclocoelia sordida
 A. tumida = Meristina tumida
 A. unisulcata = Pentagonia peersii

 參考文獻 

 外部連結 

Atrypa  in the Paleobiology Database


 延伸閱讀 
 Treatise on Invertebrate Paleontology, Part H, Brachiopoda (1965). University of Kansas Press and the Geological Society of America.
 Moore, Lalicker, and Fischer 1952. Invertebrate Fossils, Ch 6, Brachiopoda, R.C. Moore.
  (1993) - Natuurgids Fossielen (het ontstaan, prepareren en rangschikken van fossielen), Zuidnederlandse Uitgeverij NV, Aartselaar. ISBN D- 1993-0001-361

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