Halgerda

Halgerda is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Discodorididae.

For the Icelandic saga character, see Hallgerda.

Halgerda
Halgerda stricklandi
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Order: Nudibranchia
Suborder: Doridina
Superfamily: Doridoidea
Family: Discodorididae
Genus: Halgerda
Bergh, 1880[1]
Type species
Halgerda formosa
Bergh, 1880

Taxonomy

The genus Halgerda was classified within the family Halgerdidae by Odhner (1934).[2] Halgerdidae Odhner, 1926, is treated as a synonym of Discodorididae in the taxonomy of Bouchet & Rocroi (2005).[3] See also Valdés (2002).[4] Seven species of Halgerda were described in the years 1880-1905, two species in 1932-1949, four species from 1975-1982, then 22 species in the years 1993-2001. In 2018 another six new species were described from Mozambique, highlighting the number of undescribed species on the African coast of the Indian Ocean.[5] A number of undescribed species are known and many species show considerable variation across their ranges, which may indicate that more cryptic species exist.[6]

Distribution

All species of Halgerda are confined to the Indo-West Pacific Tropical region apart from two species which are found in warm temperate waters of South Africa and Southern Australia and one species from warm temperate Japanese waters.

Species

Species within the genus Halgerda include:[7]

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References
  1. Bergh, L.S.R. 1880. Beiträge zur Kenntniss der japanischen Nudibranchien. I. Verhandlungen der königlich-kaiserlich Zoologisch-botanischen Gesellschaft in Wien (Abhandlungen) 30:155-200, pls. 1-5, pages 191-5.
  2. Odhner N. H. (1934). "The Nudibranchiata, British Antarctic ("Terra Nova") Expedition, 1910". Natural History Report, Zoology 7(5): 229-310.
  3. Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. Hackenheim, Germany: ConchBooks. 47 (1–2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997.
  4. Valdés A. (2002). "A phylogenetic analysis and systematic revision of the cryptobranch dorids (Mollusca, Nudibranchia, Anthobranchia)". Zoological Journal of the Linnean Society 136: 535-636. doi:10.1046/j.1096-3642.2002.00039.x.
  5. Tibiriçá, Y.; Pola, M.; Cervera, J. L. (2018). Systematics of the genus Halgerda Bergh, 1880 (Heterobranchia : Nudibranchia) of Mozambique with descriptions of six new species. Invertebrate Systematics.
  6. Gosliner, T.M., Behrens,D.W. & Valdes,A., 2008. Indo-Pacific Nudibranchs and Sea Slugs. A field guide to the World's most diverse fauna. Sea Challengers Natural History Books & The California Academy of Sciences. ISBN 978-0-9700574-3-3
  7. Bouchet, P.; Gofas, S. (2014). Halgerda Bergh, 1880. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=205320 on 2015-01-25
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