Dugesia hepta Pala, Casu & Vacca, 1981

Stocchino, Giacinta Angela, 2018, 80 years of research on planarians (Platyhelminthes, Tricladida) from Sardinia, Italy: an annotated checklist, Zootaxa 4532 (4), pp. 539-552 : 540

publication ID	https://doi.org/10.11646/zootaxa.4532.4.5
publication LSID	lsid:zoobank.org:pub:807B317B-D883-439F-97B9-B0C0F09D9666
DOI	https://doi.org/10.5281/zenodo.5988952
persistent identifier	https://treatment.plazi.org/id/C45EE309-B119-FFF4-66FB-FA5C10AAF82E
treatment provided by	Plazi (2019-03-28 15:58:19, last updated 2024-11-26 06:04:37)
scientific name	Dugesia hepta Pala, Casu & Vacca, 1981
status

Treatment

Dugesia hepta Pala, Casu & Vacca, 1981 View in CoL

Dugesia hepta View in CoL is a Sardinian endemic species restricted only to four hydrographic basins in the northwestern part of the island ( Pala et al., 1981; Stocchino et al., 2005) ( Fig. 1 View FIGURE 1 ). The species is characterized by a peculiar chromosome number (2n = 14; n = 7), from which derives its specific epithet, which is unique within the Palaearctic Region. This chromosomal pattern is known only for Dugesia ryukyuensis Kawakatsu, Oki, Tamura & Sugino, 1976 View in CoL , and D. batuensis Ball, 1970 View in CoL , both from eastern Asia ( Ball, 1970; Kawakatsu et al., 1976). Dugesia hepta View in CoL is also morphologically well distinguishable because of a peculiar dorsal ejaculatory duct with a lateral opening and a ventro-lateral penial fold. Among Dugesia species this dorsal course of the ejaculatory duct character is shared by only one other species viz. D. superioris Stocchino & Sluys, 2013 View in CoL from Lake Ohrid in Albania ( Stocchino et al., 2013b, 2017c). Dugesia hepta View in CoL populations are exclusively sexual with a life cycle comparable to that of other European dugesiids, such as D. ilvana Lepori, 1948 View in CoL from Elba Island and D. gonocephala ( Dugès, 1830) View in CoL from Central Europe (cf. Stocchino & Manconi, 2013). A recent origin of D. hepta View in CoL from D. benazzii View in CoL was suggested by molecular analysis ( Lazaro et al., 2009). This hypothesis is also supported by the coexistence of the two species at many localities in all of the Sardinian hydrographic basins inhabited by D. hepta View in CoL .

References

Ball, I. R. (1970) Freshwater triclads (Turbellaria, Tricladida) from the oriental region. Zoological Journal of the Linnean Society, 49, 271 - 294. https: // doi. org / 10.1111 / j. 1096 - 3642.1970. tb 00742. x

Duges, A. (1830). Apercu de quelques observations nouvelles sur les Planaires et plusieurs genres voisins. Annales des Sciences Naturelles, 21, 72 - 91.

Kawakatsu, M., Oki, I., Tamura, S. & Sugino, H. (1976) Studies on the morphology, karyology and taxonomy of the Japanese freshwater planarian Dugesia japonica Ichikawa and Kawakatsu, with a description of a new subspecies, Dugesia japonica ryukyuensis subspec. nov. The Bulletin of Fuji Women's College, 14, 81 - 126. https: // doi. org / 10.1007 / bf 00036363

Lazaro, E. M., Sluys, R., Pala, M., Stocchino, G. A., Baguna, J. & Riutort, M. (2009) Molecular barcoding and phylogeography of sexual and asexual freshwater planarians of the genus Dugesia in the Western Mediterranean (Platyhelminthes, Tricladida, Dugesiidae). Molecular Phylogenetics and Evolution, 52, 835 - 845. https: // doi. org / 10.1016 / j. ympev. 2009.04.022

Pala, M., Casu, S. & Vacca, R. A. (1981) Dugesia hepta, nuova specie di planaria di acqua dolce di Sardegna appartenente alla superspecie Dugesia gonocephala (Duges) (Turbellaria, Tricladida). Bollettino della Societa Sarda di Scienze Naturali, 20, 97 - 107.

Stocchino, G. A., Corso, G., Manconi, R., Casu, S. & Pala, M. (2005) Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus. Journal of Natural History, 39, 1947 - 1960. https: // doi. org / 10.1080 / 00222930500060025

Stocchino, G. A., Sluys, R., Deri, P. & Manconi, R. (2013 b) Integrative taxonomy of a new species of planarian from the Lake Ohrid basin, including an analysis of biogeographical patterns in freshwater triclads from the Ohrid region (Platyhelminthes, Tricladida, Dugesiidae). ZooKeys, 313, 25 - 43. https: // doi. org / 10.3897 / zookeys. 313.5363

Stocchino, G. A., Sluys, R., Riutort, M., Sola, E. & Manconi, R. (2017 c) Freshwater planarian diversity (Platyhelminthes, Tricladida, Dugesiidae) in Madagascar: new species, cryptic species, with a redefinition of character states. Zoological Journal of the Linnean Society, 181, 727 - 756. https: // doi. org / 10.1093 / zoolinnean / zlx 017

Figures

FIGURE 1. Geographic distribution of species of the genus Dugesia recorded from Sardinia. 1, Rio d’Auteri reservoir, Asinara Island National Park; 2, Rio Mannu di Portotorres; 3, Fiume Silis; 4, Rio Lu Bagnu; 5, Fiume Coghinas; 6, Fiume Liscia; 7, spring and wells on the Tavolara Island Protected Area; 8, springs and unnamed rivulets on the Molara Island Protected Area; 9, Rio Su Lernu; 10, Rio Cuga; 11, Rio de sa Pazzosa; 12, Rio Torre Argentina; 13, Fiume Temo; 14, Sa Ucca ‘e su Peltusu Cave; 15, Rio S’Abba Mala; 16, Rio Mannu di Scano di Montiferro; 17, Rio Santa Caterina; 18, Fiume Tirso; 19, Su Cantaru Spring, Rio di Siniscola basin; 20, Fiume Cedrino; 21, Rio Osalla; 22, Rio Mannu di Milis; 23, Rio di Monte Arci; 24, Fiume Flumendosa; 25, Rio Mannu di Cagliari; 26, Fiume Quirra; 27, Rio Acqua ‘e sa Murta, S. Antioco Island; 28, Rio Triga, S. Antioco Island; 29, Rio ‘e sa Canna, S. Antioco Island; 30, Rio Flumentepido; 31, Rio Gutturu Mannu; 32, Rio Geremeas. New records are indicated by asterisks.