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Verification of the life-cycle of Helicosphaera pavimentum, and discussion of the identity of Syracolithus dalmaticus

A new observation of a combination coccosphere of Helicosphaera pavimentum and Syracolithus dalmaticus confrms the previous tentative suggestion of Triantaphyllou et al. (2016) that these are alternate life-cycle phases of a single species. A re-examination of the type description of S. dalmaticus, however, showed that the name has been misapplied, and that the holococcolith phase of the life-cycle of H. pavimentum has never been described. Hence, the correct name for the species remains H. pavimentum. It is further argued that both S. dalmaticus and Homozygosphaera vercellii are synonyms of the holococcolith phase of Coronosphaera mediterranea––C. mediterranea HOL wettsteinii type. This further means that Coronosphaera is a junior synonym of not only Zygosphaera, but also Syracolithus. As such, we defnitively accept the conclusion of Triantaphyllou et al. (2016) that the genus Coronosphaera should be recombined into Syracosphaera.

life-cycle ; Helicosphaera ; taxonomy ; Syracolithus

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