Primitive cladid crinoids from upper Osagean-lower Meramecian (Mississippian) rocks of east-central United States

Abstract

Species of the late Osagean and early Meramecian primitive cladid crinoid generaAtelestocrinus, Barycrinus, Cestocrinus, Costalocrinus, Cyathocrinites, Meniscocrinusn. gen.,Parisocrinus, Pellecrinus, andSaccosomopsisfrom Illinois, Indiana, Iowa, Kentucky, Missouri, and Tennessee are reviewed, redescribed, and redefined from study of type material, museum collections, and field collections. Nomenclatural and systematic acts include the following: 1)Barycrinus spurius(Hall, 1858) is a senior synonym ofCyathocrinus tumidusHall, 1858,C. protuberansHall, 1858, andB. mammatusMeek and Worthen, 1873; 2)B. rhombiferus(Owen and Shumard, 1852a) is a senior synonym ofC. sculptilisHall, 1860,C. thomaeHall, 1860,C. hoveyiHall, 1861a,C. wachsmuthiMeek and Worthen, 1861,B. herculeusMeek and Worthen, 1868,B. pentagonusMeek and Worthen, 1873,B. striatusWorthen, 1875,B. boonvillensisMiller, 1891b,B. formosusMiller and Gurley, 1894,B. washingtonensisMiller and Gurley, 1895, andB. elrodiMiller and Gurley, 1896a; 3)B. magister(Hall, 1858) is a senior synonym ofC. solidusHall, 1861a andB. magnificusMeek and Worthen, 1868; 4)B. stellatus(Hall, 1858) is a senior synonym ofC. bullatusHall, 1858,C. angulatusMeek and Worthen, 1860,C. quinquelobusMeek and Worthen, 1865, andB. astericusVan Sant, 1964; 5)B. crassibrachiatus(Hall, 1860) is a senior synonym ofB. princepsMiller and Gurley, 1890a; 6)B. geometricusMeek and Worthen, 1873, is considered a nomen dubium; 7)B. benedicti(Miller, 1891a) is considered a nomen dubium; 8)Cyathocrinus signatusMiller and Gurley, 1894, is assigned toCestocrinusand is a senior synonym ofCestocrinus striatusKirk, 1940; 9)Cyathocrinites iowensis(Owen and Shumard, 1850) is a senior synonym ofC. malvaceusHall, 1858,C. divaricatusHall, 1858,C. rotundatusHall, 1858,C. viminalisHall, 1861a,C. parvibrachiatusHall, 1861a,C. hamiltonensisWorthen, 1882,C. nodosusWachsmuth and Springer, 1890,C. brevisacculusWachsmuth and Springer, 1890,C. opimusMiller and Gurley, 1890a, andC. gurleyiMiller, 1891a; 10)C. kelloggi(White, 1862) is a senior synonym ofC. subtumidusMeek and Worthen, 1865; 11)C. farleyi(Meek and Worthen, 1866b) is a senior synonym ofC. andersoniMiller and Gurley, 1894,C. granulosusRowley, 1902, andC. snivelyiRowley, 1902; 12)C. harrodi(Wachsmuth and Springer, 1880) is a senior synonym ofC. boonvillensisMiller, 1891b,C. gorbyiMiller, 1892b, andC. astralusKammer, 1984; 13)Meniscocrinusn. gen. is described andM. magnitubusn. sp. is assigned to this new genus; 14)C. labyrinthicusMiller, 1891a, is assigned toParisocrinus; 15)C. intermediusHall, 1858, is assigned toPellecrinus; and 16)C. insperatusLyon, 1869, is assigned toSaccosomopsisand is a senior synonym ofC.?poteriumMeek and Worthen, 1870.