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New endemic brachiopod and echinoderm genera from the Upper Ordovician of the St. Petersburg region, northwestern Russia

2008; Taylor & Francis; Volume: 130; Issue: 2 Linguagem: Inglês

10.1080/11035890801302087

2000-0863

Michael Zuykov, Sergei S. Terentiev, David A. T. Harper,

Marine Biology and Ecology Research

Abstract A new brachiopod and a rhombiferan cystoid are described from the Gryazno and Schundorovo formations (Upper Ordovician; middle Sandbian), Idavere Regional Stage, of the St. Petersburg Region (northwestern Russia). The fossils are part of an abundant, well-preserved benthic fauna. The rhynchonelliformean brachiopod Madiorthis alsami gen. et sp. nov. belongs to the family Plaesiomyidae (subfamily Plaesiomyinae); the dichoporite echinoderm Fusicystis magnificus gen. et sp. nov. is assigned to the family Echinoencrinitidae (subfamily Scoliocystinae). These new taxa have not been found outside the type locality. Key Words: BrachiopodaEchinodermataUpper OrdovicianSandbianSt. Petersburg RegionRussianew taxa