Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... tubercles on the inner edge of the umbilical wall . Very strong , rounded tubercles occur at or slightly below midflank . When well preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs ...
... tubercles on the inner edge of the umbilical wall . Very strong , rounded tubercles occur at or slightly below midflank . When well preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs ...
Page 98
... tubercle ; other ribs bear rounded tubercles on the ventrolateral edge , and all ribs are interrupted on the venter at a smooth , siphonal band . Only one specimen , the holotype C80037 ( Figs 17 , 18A - C ) , shows the tuberculate ...
... tubercle ; other ribs bear rounded tubercles on the ventrolateral edge , and all ribs are interrupted on the venter at a smooth , siphonal band . Only one specimen , the holotype C80037 ( Figs 17 , 18A - C ) , shows the tuberculate ...
Page 114
... tubercle develops . In contrast , ventral , transversely elongated tubercles are well developed , and some bear indications that they are in fact the bases of short spines . Tubercle strength varies from mere swellings to marked , sharp ...
... tubercle develops . In contrast , ventral , transversely elongated tubercles are well developed , and some bear indications that they are in fact the bases of short spines . Tubercle strength varies from mere swellings to marked , sharp ...
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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