Summary: | FIGURE 1. Branch fragments showing hydrothecal arrangement and shape of hydrothecae: A, Acryptolaria conferta (Allman, 1877); B, Acryptolaria crassicaulis (Allman, 1888); C, Acryptolaria flabellum (Allman, 1888); D, Acryptolaria minuta Watson, 2003; E, Acryptolaria operculata Stepanjants, 1979. (A from 715/885; B from 2/11; C from 22/1520; D from 27/1852; E from 715/885). Scale bar: 500 µm. Published as part of Peña Cantero, Álvaro L., 2020, Species of Acryptolaria Norman, 1875 (Cnidaria: Hydrozoa) collected by US Antarctic and sub-Antarctic expeditions, pp. 277-294 in Zootaxa 4767 (2) on page 280, DOI:10.11646/zootaxa.4767.2.4, http://zenodo.org/record/3771174
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