Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum |
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Page 80
Close coiling ( albeit not with a dorsal zone of impression ) associated with strong
ornamentation of the inner whorls is known in the Boreal ' Paracrioceras ' ,
especially in the group of Crioceratites ( C. ) denckmanni ( Müller , 1892 ) ( sensu
...
Close coiling ( albeit not with a dorsal zone of impression ) associated with strong
ornamentation of the inner whorls is known in the Boreal ' Paracrioceras ' ,
especially in the group of Crioceratites ( C. ) denckmanni ( Müller , 1892 ) ( sensu
...
Page 97
6 ( figs 2–3 ) ) , but the coiling in this species is also more open crioceratitid than
in C. ( C. ) yrigoyeni . Crioceratites janus Thieuloy ( 1979 : 310 , pl . 2 ( figs 1-4 ) )
, from the Upper Barremian of the Southern Vercors Mountains and referred to ...
6 ( figs 2–3 ) ) , but the coiling in this species is also more open crioceratitid than
in C. ( C. ) yrigoyeni . Crioceratites janus Thieuloy ( 1979 : 310 , pl . 2 ( figs 1-4 ) )
, from the Upper Barremian of the Southern Vercors Mountains and referred to ...
Page 107
Sarkar ( 1955 ) believed that Acrioceras could be divided into four subgenera ,
based primarily on the mode of coiling , i.e. acrioceratid or aspinoceratid , and
whether major ribs , if present , are or are not trituberculate . His scheme is as
follows ...
Sarkar ( 1955 ) believed that Acrioceras could be divided into four subgenera ,
based primarily on the mode of coiling , i.e. acrioceratid or aspinoceratid , and
whether major ribs , if present , are or are not trituberculate . His scheme is as
follows ...
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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 |