Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs pass straight ... preservation is good , distinct looping is visible , and up to four ribs may connect between the tubercles on the ...
... preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs pass straight ... preservation is good , distinct looping is visible , and up to four ribs may connect between the tubercles on the ...
Page 97
... preserved for definite identification , but it does superficially resemble C. ( C. ) yrigoyeni . The early whorls of C. ( C. ) yrigoyeni are indistinguishable from those of coarsely ornamented forms of Acrioceras zulu sp . nov ...
... preserved for definite identification , but it does superficially resemble C. ( C. ) yrigoyeni . The early whorls of C. ( C. ) yrigoyeni are indistinguishable from those of coarsely ornamented forms of Acrioceras zulu sp . nov ...
Page 127
... preserved , retaining replaced shell and part of the body chamber . Coiling is involute , with a small , shallow umbilicus ( 20 % of the diameter ) . The umbilical wall is flat , and inclined outwards ; the umbilical shoulder is ...
... preserved , retaining replaced shell and part of the body chamber . Coiling is involute , with a small , shallow umbilicus ( 20 % of the diameter ) . The umbilical wall is flat , and inclined outwards ; the umbilical shoulder is ...
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Common terms and phrases
Acrioceras Acrioceras sp Africa Aguirre Urreta 1981 ammonites Ammonoidea Ancyloceras Ancyloceratinae Aptian Aspinoceras aspinoceratid australis sp barremense BMNH body chamber Boreal and Tethyan bullae ceras cliff and gully close coiling coarsely ornamented Collignon 1962 compressed Crioceratites Crioceratites s.s. Cryptocrioceras cundimarcae d'Orbigny diameter dimorphism discussion early whorls emerici Emericiceras family Ancyloceratidae flexuous genus genus Crioceratites Geology Giovine group of Crioceratites Hauterivian Hemihoplites sp holotype Immel inner whorls Kakabadze 1981 Leveillé lobe locality 170 Lower Barremian major ribs material Menuthiocrioceras Mlambongwenya Trading Store monopujaae Neuquén Obata outer whorls Palaeontology Paracrioceras Paraspinoceras Patagonia Pedioceras phragmocone Pseudothurmannia Rawson referred ribs Riccardi & Aguirre Sarkar Sornayites South African Museum southern Patagonia Spath species groups specimens tabarelli Astier taxonomic Tethyan Realm text-fig Thieuloy Thomel trituberculate ribs tubercles type species umbilical shoulder umbilical wall uncoiled Unterkreide Upper Barremian Upper Hauterivian Valanginian venter ventral tubercles ventrolateral shoulder whorl section Wiedmann yrigoyeni Leanza zulu sp Zululand