Shape |
Subtriangular |
Subhexangular |
Ovate to ovate- polygonal |
Ovate to ovate diamond-shaped |
Subquadrangular |
Ornament |
Commarginal growth lines |
Commarginal wavy ridges |
Commarginal growth lines |
Commarginal growth lines |
Commarginal growth lines |
Ligament |
Thick and external with small internal part |
Partially external |
Variably sunken, short to medium |
Sunken, short to medium |
Thick, sunken and long |
Character of posterodorsal margin |
Ps, (sms), no auricle, wide and deep escutcheon |
Ps, no auricle, small escutcheon |
Ps, sms, auricle, variable escutcheon |
Ps, no auricle, ill- defined escutcheon |
Ps, (sms), no auricle, no escutcheon |
Adductor muscle scars |
AAMS smaller and weaker than PAMS |
AAMS ≈ PAMS |
AAMS larger than PAMS |
AAMS larger than PAMS |
AAMS much larger than PAMS |
Reference |
This study |
Payne & Allen 1991; Löffler
et al.
2006; Oliver & Holmes 2007
|
Payne & Allen 1991; Oliver & Killeen 2002; Oliver & Holmes 2006; Rodrigues
et al.
2008; Zelaya 2009
|
Iredale 1930; Payne & Allen 1991; Oliver & Killeen 2002; Zelaya 2009 |
Kamenev
et al.
2001; Okutani 2002
|