The distribution, origins and taxonomy of Tricellaria inopinata d'Hondt and Occhipinti Ambrogi, 1985, an invasive bryozoan new to the Atlantic
2000
Populations of the invasive cellularine bryozoan Tricellaria inopinata d'Hondt and Occhipinti Ambrogi have recently (August 1998) been identified from the coast of southern England, representing the first Atlantic records for this taxon. Although first named from material collected in the Venice Lagoon in 1982, T. inopinata was subsequently identified as invasive there and of unspecified Pacific origin. An appraisal of samples and literature from various global regions suggests that Atlantic and Adriatic T. inopinata correspond with a morphospecies known to be invasive in New Zealand, and cryptogenic in Pacific North America, Japan and Australia. The morphospecies in question has usually been referred to as T. occidentalis (Trask, 1857) and in at least one instance as T. porteri (MacGillivray, 1889). Morphological comparisons, however, indicate that Adriatic, Atlantic and putative T. inopinata from the Pacific differs morphologically from early descriptions and specimens of T. occidentalis from Pacific No...
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