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Pinna rudis Linnaeus, 1758 (Bivalvia: Pinnidae) has an Atlantic-Mediterranean distribution. Habitat degradation is considered the main cause of population declines in the recent past, raising the conservation status of the species to the category of vulnerable in some places. Population dynamics studies of P. rudis are still necessary to fully understand its conservation requirements. Moreover, new methods of individual data collection should be developed as individuals are highly sensitive to extraction and manipulation. In the present study, we propose a non-invasive method to collect P. rudis morphometric data in situ. For this, we sampled 900 m2 of the sea bed at Matiota Beach on São Vicente Island, Cabo Verde Archipelago, and collected 18 individuals to compute the relationship between shell length and width. The regression equation between the parameters allowed us to estimate the total size of 59 P. rudis individuals obtained from the beach. The non-invasive method adopted allowed determination of the total size of the individuals without removing them from the substratum and, thereby, allowing the comparative study of the species in different zones.
Leiosolenus aristatus (Dillwyn, 1817) new to the Cape Verde Islands (Mollusca, Bivalvia, Mytilidae)
(2011)
Leiosolenus aristatus (Dillwyn, 1817) is a small bivalve that pierces into calcareous substrata, particularly shells of other mollusks. Previously, the taxon has often been placed in Lithophaga Röding, 1798. It was then transferred to Myoforceps Fischer, 1886, which is now included in the synonymy of Leiosolenus Carpenter, 1856 (cf. Huber 2012).
Based on newly collected samples and data from the literature, an updated list of the marine bivalves of the Cape Verde Islands is presented. From 2004 to 2006, collections were made at 22 sampling points in the islands of Santiago, São Vicente, Santa Luzia, São Nicolau, Boavista and Maio. Using qualitative and direct sampling methods, 39 species of bivalves, belonging to 20 families, were identified. Families most represented were Veneridae (6 species), Cardiidae (5 species), Arcidae (4 species) and Mytilidae (4 species). Islands with the largest diversity of species were São Vicente (30 species) and Santiago (23 species), probably due to the larger number of sample points (64% of total). Six species not previously reported from the archipelago were collected, i.e. Irus irus, Venus declivis, Timoclea ovata, Diplodonta rotundata, Plagiocardium papillosum and Tagelus adansoni. Corbicula fluminea, supposedly a man assisted introduction, was also collected.