Modiolus carvalhoi is a species of bivalve mollusc, commonly known as a horsemussel, described by Klappenbach in 1966. It belongs to the genus Modiolus, which includes other species of horsemussels. Modiolus carvalhoi is part of the family Mytilidae, the mussels.Rios, E. C. (1994) Seashells of Brazil. 2 nd Edition. Editora da FURG, Rio Grande, 368 pp.
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