Abstract
Variability in shell growth and morphology of the wallplate junctions of Tesseropora rosea (Krauss) were studied in 1983 in New South Wales, Australia, at two sites with differing wave exposure. The wall-plate junctions, a combination of “dado” (geometrically interlocking) and “lap” bints, increase in complexity with age, but do not differ between sites. The number of parietal tubes is fixed at settlement and does not differ between sites, but differs among wall plates in a manner consistent with their evolutionary history (rostrum > laterals > carina). The number of secondary septa increases with age, but does not differ between sites. In epilithic T. rosea, growth of the alae contributes to orifice enlargement. Epizoic T. rosea (on limpets) have conspicuous radii and display diametric growth. At the more exposed site, the shell wall was sleeper, and the aperture length, height and weight of the shell increased at a faster rate than at the less exposed site, but the maximum height of the shell was less. These differences appear to be due to a combination of greater feeding rates and greater erosion rates at the exposed site. The greater maximum height attained at the more sheltered site may be due to greater individual longevity. Juveniles at the sheltered site had thinner septa in the laterals than those at the exposed site. Septa in adults were rhinner at the exposed site, but this is due to age differences between sites in the adult populations.
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Communicated by G. F. Humphrey, Sydney
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Otway, N.M., Anderson, D.T. Variability of shell growth and morphology of the wall-plate junctions of the intertidal barnacle Tesseropora rosea (Cirripedia: Tetraclitidae). Mar. Biol. 85, 171–183 (1985). https://doi.org/10.1007/BF00397436
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DOI: https://doi.org/10.1007/BF00397436