New Species and New Records of Sponge-Inhabiting Barnacles (Cirripedia, Balanidae, Acastinae) from Australia
2021
Andrew M. Hosie | Jane Fromont | Kylie Munyard | Diana S. Jones
The subfamily Acastinae contains a diverse group of barnacles that are obligate symbionts of sponges and alcyonacean and antipatharian corals. Integrating morphological and genetic (<i>COI</i>) data to compare against known species, this paper reports on nine species of sponge-inhabiting barnacles of the subfamily Acastinae, including three undescribed species (<i>Acasta caveata</i> sp. nov., <i>Euacasta acutaflava</i> sp. nov., and <i>E. excoriatrix</i> sp. nov.) and three species previously not recorded in Australian waters (<i>A. sandwichi</i>, <i>Pectinoacasta cancellorum,</i> and <i>P. sculpturata</i>). The new species are distinguished from similar species by a suite of morphological characters as well as genetic distances. A lectotype for <i>Pectinoacasta cancellorum</i> is designated. Sponge hosts were identified for all specimens where possible and are represented by 19 species from eight families and five orders.
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