Please see The "New worldwide coeries"PP.34 , Typical p.porteri from Phlippines are considerably broader and more depressed ,the margin are MORE PRODUCED and rather distinctly angular.
照您這種說法,台灣柔姬與澳洲的p.nigromaculata都是不成熟的,只有菲律賓的是老貝囉.
joycae就算很老,左右兩側也不會有明顯或厚重之callous
您可以多去比較柔姬與波塔的圖片或實物
本人經手及參觀別收藏的柔姬活殼已超過2位數
應該不會差太多