ORDOVICIAN BRACHIOPODA 



Kjaerina (Hedstroemina) sp. 

 Subfamily Glyptomeninae Williams 

 Bystromena gen. nov. . 

 Bystromena perplexa gen. et sp. nov. 

 Family Leptaenidae Hall & Clarke . 

 Leptaena Dalman 



Leptaena cf . ventricosa Williams . 

 Kiaeromena Spjeldnaes 

 Kiaeromena cf. kjerulfi (Holtedahl) 

 Order Pentamerida Schuchert & Cooper 

 Suborder Syntrophiidina Ulrich & Cooper 

 Superfamily Porambonitacea Davidson 

 Family Syntrophiidae Schuchert 

 Subfamily Xenelasmatinae Ulrich & Cooper 

 Euorthisina Havlicek . 

 Euorthisina cf . moesta minor Havlicek 

 Family Parastrophinidae Ulrich & Cooper 

 Parastrophinella Schuchert & Cooper 

 Parastrophinella musculosa sp. nov. 

 Parastrophinella sp. . 

 Order Rhynchonellida Kuhn 



Superfamily Rhynchonellacea Gray 

 Family Trigonirhynchiidae McLaren 

 Rostricellula Ulrich & Cooper 

 Rostricellula sparsa Williams 

 Order Spiriferida Waagen . 

 Suborder Atrypidina Moore 

 Superfamily Atrypacea Gill 

 Family Atrypidae Gill 

 Subfamily Zygospirinae Waagen 

 Zygospira Hall 

 Zygospira sp. 

 VI. Acknowledgments 

 VII. References . 

 VIII. Index 



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SYNOPSIS 



A study of fossil Brachiopoda collected mainly as moulds from the Ordovician successions of 

 the Shelve area, reveals the presence of 83 species and subspecies (35 of them new) belonging to 

 63 genera, of which Astraborthis, Protoskenidioides , Salacorthis and Whittardia are new orthaceans, 

 Caeroplecia a new triplesiacean, Eocramatia a new plectambonitacean and Bystromena a new 

 strophomenacean. Whittardia is placed in a new subfamily Whittardiinae and Eocramatia in 

 a new family Eocramatiidae. 



The number of taxa identified in assemblages recovered from any one formation is small, and 

 only exceeds 20 in the Spy Wood Grit and Whittery Shales. This relative poverty of the faunas 

 is at least partly related to rock type, with a dominantly inarticulate association comprising 

 only a few genera prevalent in shales, and a richer, mainly articulate association more typical 

 of the siltstones and sandstones. Both associations evolved by significant replacements of 

 genera as well as species from one horizon to another, so that no combination of taxa can be 

 described as consistently characteristic of either. 



The faunas are also restricted in geographical distribution. They show affinities with assem- 

 blages from Wales and E. Shropshire and confirm the currently adopted correlation of the 



