Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum |
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Page 82
The very earliest forms of Menuthiocrioceras in the Lower Valanginian ( see e.g.
Collignon 1962 : 20 , pl . 181 ( fig . 821 ) —this could possibly be an uncoiled
neocomitid and not a crioceratitid ( Dr P. F. Rawson pers . comm . ) ) , are already
...
The very earliest forms of Menuthiocrioceras in the Lower Valanginian ( see e.g.
Collignon 1962 : 20 , pl . 181 ( fig . 821 ) —this could possibly be an uncoiled
neocomitid and not a crioceratitid ( Dr P. F. Rawson pers . comm . ) ) , are already
...
Page 115
Discussion As here interpreted , this species is very variable , so much so that , in
terms of ornament on the spiral whorls , we can speak of compressed , bi- or
incipiently quadrituberculate , finely ribbed forms , e.g. 080005a - c ( Fig .
Discussion As here interpreted , this species is very variable , so much so that , in
terms of ornament on the spiral whorls , we can speak of compressed , bi- or
incipiently quadrituberculate , finely ribbed forms , e.g. 080005a - c ( Fig .
Page 130
If Spath really intended uniting forms with different coiling , it was certainly not
with dimorphism in mind . Thomel ( 1981 ) subsequently added to his initial views
, commenting on the similarity between Acrioceras tabarelli ( Astier ) and ...
If Spath really intended uniting forms with different coiling , it was certainly not
with dimorphism in mind . Thomel ( 1981 ) subsequently added to his initial views
, commenting on the similarity between Acrioceras tabarelli ( Astier ) and ...
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Common terms and phrases
according Acrioceras Aguirre Urreta Ancyloceratinae appears Aspinoceras association australis sp authors Barremian bear BMNH body chamber Boreal ceras close coiling coiling Collignon 1962 compared compressed consists Crioceratites Cryptocrioceras described Description developed diameter dimorphism discussion distinct early elongated Emericiceras figured finely flanks followed forms genus Hemihoplites holotype illustrations Immel impression included inner whorls Italy Klinger known lateral lobe locality Lower material Menuthiocrioceras Museum Note occur ornament outer whorls Paracrioceras Patagonia possible preserved Realm recently referred regarded ribs Riccardi & Aguirre rounded Sarkar separate shaft shoulder shows similar single Sornayites South southern Spath specimens stage strong strongly subfamilies suggested suture synonym systematic tabarelli Astier taxonomic Tethyan Thieuloy Thomel trituberculate tubercles type species umbilical uncoiled Upper Upper Barremian variable venter ventral ventrolateral whorl section Wiedmann Wright yrigoyeni Leanza zone zulu sp Zululand
Bibliographic information
| Title | Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum Volume 101, Issue 5 of Annals of the South African Museum, South African Museum |
| Author | South African Museum |
| Publisher | South African Museum, 1992 |
| Original from | the University of California |
| Digitized | 21 Jul 2016 |
| ISBN | 0868131288, 9780868131283 |
| Export Citation | BiBTeX EndNote RefMan |