Abstract
Acryptolaria is a worldwide genus of deep-water benthic hydroids. The genus has relatively high species diversity, with 36 species described so far, yet most of them have been reported only occasionally. As a result, scientific knowledge of their ecology and distribution is scarce. Here I present the results of the study of species of Acryptolaria collected during several Antarctic and sub-Antarctic expeditions under the United States Antarctic Research Program between 1958 and 1986. Eight species were found in the collection (plus one determined to the genus level), with A. operculata having the highest occurrence. Acryptolaria flabellum is reported for the second time; the study also represents the third record for A. corniformis and A. minuta. Despite the scarcity of records, most of the species studied seem to have a wide geographical distribution, which could be related to their deep-water bathymetric distribution and the deep-water circulation of the Great Ocean Conveyor Belt.
References
Allman, G.J. (1877) Report on the Hydroida collected during the exploration of the Gulf Stream by L.F. de Pourtalès, assistant United States Coast Survey. Memoirs of the Museum of Comparative Zoölogy, Harvard College, 5, 1–66, pls. 1–34.
https://doi.org/10.5962/bhl.title.15852
Allman, G.J. (1888) Report on the Hydroida dredged by H.M.S. Challenger during the years 1873–76. II. Tubularinae, Corymorphinae, Campanularinae, Sertularinae and Thalamophora. Report of the Scientific Results of the Voyage of H.M.S. Challenger 1873–1876, 23 (70), i–xix + 1–90, 40 pls.
El Beshbeeshy, M. (1991) Systematische, Morphologische und Zoogeographische Untersuchungen an den Thekaten Hydroiden des Patagonischen Schelfs. University of Hamburg, Hamburg, 390 pp.
El Beshbeeshy, M. (2011) Thekate Hydroiden von Patagonischen Schelf (Cnidaria, Hydrozoa, Thecata). Edited by G. Jarms. Verhandlungen des Naturwissenschaftlichen Vereins in Hamburg, 46, 19–233.
Hartlaub, C. (1904) Hydroiden. In: Expédition antarctique Belge. Résultats du voyage du S.Y. Belgica en 1897–1899. Rapports scientifiques, Zoologie, pp. 1–19.
Moura, C.J., Cunha, M.R., Porteiro, F.M. & Rogers, A.D. (2011) Polyphyly and cryptic diversity in the hydrozoan families Lafoeidae and Hebellidae (Cnidaria : Hydrozoa). Invertebrate Systematics, 25, 454–470.
https://doi.org/10.1071/IS11045
Naumov, D.V. & Stepanjants, S.D. (1962) Hydroida (Thecaphora) collected by the Soviet Antarctic Expedition on the M/V Ob in antarctic and subantarctic waters. In: Biological results of the Soviet Antarctic Expedition, 1955–1958, 1. Issledovaniya Fauny Morei, 1 (9), 68–106.
Norman, A.M. (1875) Submarine-cable fauna. Part II. Crustacea, etc. Annals and Magazine of Natural History, Series 4, 15, 169–176, pl. 12.
https://doi.org/10.1080/00222937508681053
Peña Cantero, A.L. (2010) Benthic hydroids (Cnidaria: Hydrozoa) from Peter I Island (Southern Ocean, Antarctica). Polar Biology, 33, 761–773.
https://doi.org/10.1007/s00300-009-0754-7
Peña Cantero, A.L. (2012) Filling biodiversity gaps: benthic hydroids from the Bellingshausen Sea (Antarctica). Polar Biology, 35, 851–865.
https://doi.org/10.1007/s00300-011-1130-y
Peña Cantero, A.L. (2014) Benthic hydroids (Cnidaria, Hydrozoa) from the continental shelf and slope off Queen Mary Coast (East Antarctica). Polar Biology, 37, 1711–1731.
https://doi.org/10.1007/s00300-014-1556-0
Peña Cantero, A.L. & Horton, T. (2017) Benthic hydroids (Cnidaria, Hydrozoa) from bathyal and abyssal depths of the Northeast Atlantic held in the modern Discovery Collections. Zootaxa, 4347 (1), 1–30.
https://doi.org/10.11646/zootaxa.4347.1.1
Peña Cantero, A.L., Marques, A. & Migotto, A. (2007) Revision of the genus Acryptolaria Norman, 1875 (Cnidaria, Hydrozoa, Lafoeidae). Journal of Natural History, 41 (5–8), 229–291.
https://doi.org/10.1080/00222930701228132
Peña Cantero, A.L., Svoboda, A. & Vervoort, W. (2004) Antarctic hydroids (Cnidaria: Hydrozoa) of the families Campanulinidae, Lafoeidae and Campanulariidae from recent Antarctic expeditions with R.V. Polarstern, with the description of a new species. Journal of Natural History, 38, 2269–2303.
https://doi.org/10.1080/00222930310001647361
Peña Cantero, A.L. & Vervoort, W. (2010) Species of Acryptolaria Norman, 1875 (Cnidaria, Hydrozoa, Lafoeidae) collected in the Western Pacific by various French expeditions, with the description of nineteen new species. Zoosystema, 32 (2), 267–332.
https://doi.org/10.5252/z2010n2a5
Ritchie, J. (1911) Hydrozoa (hydroid zoophytes and Stylasterina) of the ‘‘Thetis’’ expedition. Australian Museum Memoirs, 4, 807–869, pls. 84–89.
https://doi.org/10.3853/j.0067-1967.4.1911.1512
Soto Àngel, J.J. & Peña Cantero, A.L. (2015) On the benthic hydroids from the Scotia Arc (Southern Ocean): new insights into their biodiversity, ecology and biogeography. Polar Biology, 38, 983–1007.
https://doi.org/10.1007/s00300-015-1660-9
Soto Àngel, J.J. & Peña Cantero, A.L. (2019) Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica). Zootaxa, 4570 (1), 001–078.
https://doi.org/10.11646/zootaxa.4570.1.1
Stepanjants, S.D. (1979) Hydroids of the antarctic and subantarctic waters. In: Biological results of the Soviet Antarctic Expedition, 6. Issledovaniya Fauny Morei, 20 (30), 1–200, pls. 1–25. [in Russian]
Vervoort, W. & Watson, J. (2003) The marine fauna of New Zealand: Leptothecata (Cnidaria: Hydrozoa) (Thecate Hydroids). NIWA Biodiversity Memoir, 119, 1–538.
Watson, J.E. (2003) Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island. Memoirs of Museum of Victoria, 60, 151–180.
https://doi.org/10.24199/j.mmv.2003.60.18