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A key for the identification of the nauplii of common barnacles of the British Isles, with emphasis on Chthamalus Ross, P.M.; Burrows, M.T.; Hawkins, S.J.; Southward, A.J.; Ryan, K.P. (2003). A key for the identification of the nauplii of common barnacles of the British Isles, with emphasis on Chthamalus. J. Crust. Biol. 23(2): 328-340. https://dx.doi.org/10.1163/20021975-99990343 In: Journal of Crustacean Biology. Crustacean Society: Washington. ISSN 0278-0372; e-ISSN 1937-240X, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 352779 [ aanvragen ]

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Trefwoorden

Analytical techniques > Microscopy > Electron microscopy British Isles Developmental stages > Larvae > Invertebrate larvae > Crustacean larvae > Nauplii Identification keys Chthamalus montagui Southward, 1976 [WoRMS]; Chthamalus stellatus (Poli, 1791) [WoRMS]; Cirripedia [WoRMS] British Isles [Marine Regions] Marien/Kust

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Auteurs		Top
Ross, P.M. Burrows, M.T. Hawkins, S.J.	Southward, A.J. Ryan, K.P.

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Abstract

Chthamalus stellatus and C. montagui are warm-water barnacles common on rocky shores in southwest England, Ireland, and southern Europe. They are partly sympatric, with overlapping vertical and horizontal distributions. It has been suggested that the differing horizontal distribution of the adults may be related to differences in the distribution of the larval stages. To this end, we have examined plankton samples taken during the summer breeding period at Plymouth, from inshore to 15 miles offshore. The samples also contained large numbers of other cirriped nauplii, notably Elminius modestus, Balanus perforatus, B. crenatus, and Verruca stroemia, from which the chthamalids had to be distinguished. The chthamalids can be separated from the other nauplii by use of characters that include a unilobed or trilobed labrum, the length of posterior processes and the shape and size of the cephalic shield, but the two species of Chthamalus are more difficult to distinguish. Scanning electron microscopy (S.E.M.) has allowed development of a key to the main barnacle nauplii occurring off the British Isles. This key, with accompanying SEM photographs, will enable enumeration of the two chthamalids and help answer the question whether there is a differential distribution of the larvae of these species.

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