太平洋牡蠣與葡萄牙牡蠣是否為同一物種?

此篇文章Differentiation between populations of thePortuguese oyster, Crassostrea angulata (Lamark) and the Pacific oyster,Crassostrea gigas (Thunberg), revealed by mtDNA RFLP analysis為限制片段長度多型性分析法來檢測Crassostrea angulata和Crassostrea gigas種群之間的遺傳分化(並且利用PCR擴增粒線體DNA片段)。此研究實驗從16個樣區取牡蠣作為實驗樣品，利用粒線體DNA標記法觀察兩牡蠣族群的遺傳分化(不標記核DNA是因為有些族群已經有雜交發生)。作者從基因以及形態學的角度去看。如基因角度分析，利用限制片段長度多型性分析法，將不同的haplotype分成六類，發現Crassostrea angulata中有較高頻率的體出現A和B類的haplotype，而Crassostrea gigas是C類的比較高；從形態學角度，Crassostrea angulata和Crassostrea gigas在生長表現和對疾病的敏感度上有明顯的不同。因此表示兩物種不太可能是同一物種。

Boudry, P., Heurtebise, S., Collet, B., Cornette, F., Gerard, A. (1998) Differentiation between populations of the Portuguese oyster, Crassostrea angulata (Lamark) and the Pacific oyster, Crassostrea gigas (Thunberg), revealed by mtDNA RFLP analysis. Journal of experimental marine biology and ecology. 226: 279-291

此篇文章Is fertility of hybrids enough to conclude that the two oysters

Crassostrea gigas and Crassostrea angulata are the same species?表示Crassostrea gigas與Crassostrea angulata被分為兩個不同品種因其地理分布不相同，Crassostrea gigas存在於亞洲而Crassostrea angulata在歐洲。然而，根據形態及遺傳和F1雜交數據，Crassostrea gigas與Crassostrea angulata被認為是單一品種。此篇文章的作者透過三個實驗和產生野生種群之間的G1及G2雜交後代研究混種生育力和精子競爭。Crassostrea gigas X Crassostrea angulata雜種育性證實，表明他們是相同的物種。

Boudry, P. (2002) Is fertility of hybrids enough to conclude that the two oysters

Crassostrea gigas and Crassostrea angulata are the same species? Aquat. Living Resour. 15: 45-52