This paper records a new sessile cirripede from a nearshore, shallow-water facies at Předboj near Prague, Czech Republic. The new taxon, Archaeochionelasmus nekvasilovae gen. et sp. nov., is the earliest known neobalanoform barnacle, and while it may have been an obligate commensal of a cephalopod or marine reptile, that it was a shore barnacle cannot be ruled out. (Zoobank registration: urn:lsid:zoobank.org:pub:177CC951-CEC1-425C-B693-46ADB83BD5D9)
A new species of acorn barnacle, Actinobalanus? sloveniensis, is recorded from Oligocene and Miocene deposits in Slovenia, representing the first record of extinct balanoids attached to plant remains from this country, and in fact from the entire central Paratethys. Assemblages
available include more than 200 specimens attached to tree branches and/or roots from a cypress forest (Taxodioxylon) and from estuarine mangroves (Carapoxylon). A taphonomic interpreta- tion is provided, suggesting that some of these remains represent fragments that were dislodged
during a storm event and quickly embedded in what were likely to have been anoxic sediments.
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