Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . parent that species based on croziersand shafts are of little value in at least some ancyloceratid genera. Form 2Fig. 21BDescription and discussion Crozier SAS 54/45/5 is virtually identical to the previous form as far asornamentation is concerned, but is only half the size. These differences probablyreflect sexual dimorphism, although this has not been widely recognized inancyloceratids. Dimensions Wb. at proximal end of shaft Wh. at proximal end of shaft Wb. in crozier Wh. in crozier Wb. near aperture Wh. near apert
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . parent that species based on croziersand shafts are of little value in at least some ancyloceratid genera. Form 2Fig. 21BDescription and discussion Crozier SAS 54/45/5 is virtually identical to the previous form as far asornamentation is concerned, but is only half the size. These differences probablyreflect sexual dimorphism, although this has not been widely recognized inancyloceratids. Dimensions Wb. at proximal end of shaft Wh. at proximal end of shaft Wb. in crozier Wh. in crozier Wb. near aperture Wh. near aperture Width of crozier . 546666 71 67 180 Form 3Figs 11 A, 23Description and discussion Crozier SAS 54/45/3 has only one lateral row of irregularly developedtubercles and does not develop flared ribbing immediately before the aperture. CRETACEOUS FAUNAS FROM SOUTH AFRICA 243 Dimensions Wb. at proximal end of shaft . — Wh. at proximal end of shaft . 78 Wb. in crozier .... c. 91 Wh. in crozier .... 81 Wb. at aperture .... 92 Wh. at aperture .... 86 Width of crozier .... 215. Fig. 15. Ancyloceras (Adouliceras) gr. ex mozambiquense-cooperi. SAM-PCM5324, crozierfrom Lubemba, Mozambique, Lower Aptian. Most common form, Form 1. x 0,48. 244 ANNALS OF THE SOUTH AFRICAN MUSEUM
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
