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On the taxonomic status and distribution of Chthamalus stellatus (Cirripedia) in the north-east Atlantic region: with a key to the common intertidal barnacles of Britain
Southward, A.J. [s.d.]. On the taxonomic status and distribution of Chthamalus stellatus (Cirripedia) in the north-east Atlantic region: with a key to the common intertidal barnacles of Britain.

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Keywords
    Adaptations; Ecological distribution; Geographical distribution; Identification keys; Taxonomy; Chthamalus Ranzani, 1817 [WoRMS]; AN, North Atlantic [Marine Regions]; Marine

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  • Southward, A.J.

Abstract
    Two spp of Chthamalus exist on the western coasts of Europe and North Africa, differing in morphology and distribution. C. stellatus (Poli), the more southern of the 2, extends from Scotland to West Africa, and is also found throughout the Mediterranean. C. montagui (= C. punctatus of Montagu, 1803) was formerly regarded as a growth from or variety of C. stellatus, but differs consistently in shape of the opercular plates, setation of the smaller cirri, and vertical zonation; it ranges from the north of Scotland to Morocco, but appears to be absent from the Mediterranean. In Britain C. montagui is more common in sheltered places while C. stellatus is most abundant on the wave-beaten coasts of the south-west. Where both spp exist together C.montagui is dominant at the higher tide-levels, C. stellatus at the lower tide-levels. Preliminary data suggest that the spp may differ in their periods of breeding and their temp adaptations, but the principal ecological character separating the spp may be the planktonic ecosystem; C. stellatus seems adapted to life in subtropical blue waters and the open ocean, while C. montagui must be better adapted to the richly particulate conditions of estuaries and sheltered coastal waters.

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