AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Dugesia tigrina | |
Authority | (Girard, 1850) | |
Family | Planariidae | |
Order | Tricladida | |
Class | Rhabditophora | |
Phylum | Platyhelminthes | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Country: USA References (not structured): Benazzi, M. 1993. Occurrence of a sexual population of Dugesia (Girardia) tigrina, a freshwater planarian native to America, in a lake of southern Italy. Italian Journal of Zoology, 60(1), pp. 129-130. |
Life form / Life stage (?) |
Comments: When they do mate, each worm deposits several egg capsules. Freshwater planarians do not have larvae. Young worms hatch from eggs. |
Sociability / Life stage (?) | Unknown References (not structured): Davison, J. 1973. Population Growth in Planaria Dugesia tigrina (Gerard) Regulation by the absolute number in the population. The Journal of General Physiology, 61(6), pp. 767-785. Comments: Dugesia tigrina is gregarious (lives in groups) found on the underside of leaves, logs, debris and rocks submerged in cool, clear and running water of streams. |
Reproductive frequency (?) | Iteroparous References (not structured): Solà Vàzquez, E. (2014). Systematics and historical biogeography of the genus Dugesia (platyhelminthes, Tricladida). Comments: The breeding cycle of the Dugesia is predominantly iteroparous, they breed repeatedly over several seasons. |
Reproductive type (?) | Asexual Sexual References: Vowinckel, C., Marsden, J. R. 1971. Reproduction of Dugesia tigrina under short-day and long-day conditions at different temperatures: I. Sexually derived individuals. Development, 26(3), pp. 587-598. Comments: Dugesia tigrina reproduces both sexually and asexually. Some populations reproduce solely sexually, while others reproduce only by fission, and still other populations reproduce both ways. High temperatures (at approximately 26°C) permit asexual transverse fission, whereas lower temperatures (approximately 20°C) yield a preference for sexual reproduction. |
Developmental trait (?) | Direct development |
Characteristic feeding method / Life stage (?) |
References (not structured): Gee, H., Young, J. O. 1993. The food niches of the invasive Dugesia tigrina (Girard) and indigenous Polycelis tennis Ijima and P. nigra (Müller)(Turbellaria; Tricladida) in a Welsh lake. Hydrobiologia, 254, pp. 99-106. Comments: Being an opportunistic predator, D. tigrina primarily forages on small crustaceans, insect larvae, small round worms, and the soft structures of some freshwater sponges. |
Mobility / Life stage (?) |
Comments: D. tigrina moves in two ways. The usual way is gliding. In gliding, head is slightly raised, over a slime tract secreted by its marginal adhesive glands. The beating of the ventral cilia in the slime tract drives the animal along. |
Salinity tolerance range (?) | Venice system: 1. Limnetic [<0.5psu] References: Claussen, D. L., Walters, L. M. 1982. Thermal acclimation in the fresh water planarians, Dugesia tigrina and D. dorotocephala. Hydrobiologia, 94, pp. 231-236. Comments: Dugesia tigrina is freswater species, typically present in lakes, ponds, and streams in temperate regions. |
Habitat modifying ability potential (?) | Unknown |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown |
Known human health impact? | Known Comments: There are no known adverse effects of D. tigrina on humans. |
Known economic impact? | Known References: Saló, E., & Baguñà, J. 1984. Regeneration and pattern formation in planarians I. The pattern of mitosis in anterior and posterior regeneration in Dugesia (G) tigrina, and a new proposal for blastema formation. Development, 83(1), pp. 63-80. Comments: Dugesia tigrina is equipped with a central nervous system (CNS) for integrative neuronal communication and has regenerative abilities. Consequently, this flatworm has been increasingly used as a model organism for educational and research purposes to better understand both tissue regeneration as a result of wear and tear and brain development as the main neural processing center in animals. |
Known measurable environmental impact? | Known References: Meyer, H., L. Learned. 1981. A field test of the potential of a local flatworm, Dugesia tigrina, for biological control of mosquitoes in temporary pools. North Dakota Farm Research, 39, pp. 19-21. Comments: Dugesia tigrina serves as prey to a variety of animals, including fish, amphibians, and insects. It is also a predator itself of insects, aquatic worms, and crustaceans. As a significant predator of insect larvae, particularly mosquitoes, Dugesia tigrina has been introduced to catch basins in Ontario to successfully limit the population growth of immature mosquitoes. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF]. Available at: (https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf) |
Association with vessel vectors (?) | Unknown |
Molecular information | Available NCBI (https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?term=girardia+tigrina) |
Last update by | Sandra Gečaitė, 2024-07-11 |