Shells that are morphologically intermediate between Acanthocardia spinosa (Lightfoot in Solander, 1786) and Acanthocardia aculeata (Linné, 1767) are reported from the Portuguese Algarve coast. Hybrid forms between these two species are not known from the literature. The supposed hybrids are compared with the two nominal species and illustrated.

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Nederlandse Malacologische Vereniging

R.P.A. Voskuil, & W.J.H. Onverwagt. (1990). Studies on Cardiidae. 2. An Acanthocardia hybrid from southern Portugal (Bivalvia). Basteria, 54(4/6), 247–251.