Diferenças anatômicas entre espécimes de Pinctada imbricata Rí¶ding, 1798 de diferentes localidades da América do Sul
Palavras-chave:
Bivalvia, Pteriomorphia, ostra perlífera, anatomia, variação intraespecíficaResumo
No presente estudo comparou-se a anatomia da ostra perlífera (Pinctada imbricata Rí¶ding, 1798) de algumas localidades da América do Sul, incluindo a Venezuela e várias regiões do Brasil. Foram encontradas variações não geográficas e geográficas. As variações não geográficas foram caracterizadas por adultos com contorno bem variável, diferentes graus de desenvolvimento da aurícula posterior e papilas da lamela interna do manto variando de normal a digitiforme. Variações geográficas podem ser divididas em dois grandes grupos: o grupo venezuelano apresentou manto mais pregueado; musculatura palial agrupada em dois conjuntos de feixes í um anterior e outro mediano-posterior; e sulco perpendicular do manto pouco desenvolvido. Espécimes dos grupos brasileiros apresentaram manto menos pregueado, com separação menos nítida entre os feixes musculares paliais anterior e posterior do manto; sulco perpendicular do manto bem desenvolvido; e lamela interna do manto estendendo-se externamente na região do manto anterior. Essas diferenças podem ser ecofenótipos ou diferenças entre as populações com certo grau de isolamento da América do Sul, diferenças essas que podem ser elucidados por estudos filogeográficos subsequentes.
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