AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Polycera hedgpethi [WoRMS] | |
Authority | (Marcus Er., 1964) | |
Family | Polyceridae | |
Order | Nudibranchia | |
Class | Gastropoda | |
Phylum | Mollusca | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Indian Ocean: Pacific --> Ocean region: NE Pacific References: Hewitt, C. L., Campbell, M. L., Thresher, R. E., Martin, R. B., Boyd, S., Cohen, B. F., ... & Lockett, M. M. (2004). Introduced and cryptogenic species in port Phillip bay, Victoria, Australia. Marine biology, 144(1), 183-202. |
Life form / Life stage (?) |
References (not structured): Giacobbe, S., De Matteo, S. 2013. The potentially invasive opisthobranch Polycera hedgpethi Er. Marcus, 1964 (Gastropoda Nudibranchia), introduced in a Mediterranean coastal lagoon. Biodiversity journal, 4(2), pp. 359-364. Comments: P. hedgpethi has a planktotrophic development which favours natural dispersal. |
Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous References (not structured): Miller, M. C. 2001. Descriptions of the dorid nudibranchs Polycera hedgpethi Marcus, 1964 and P. fujitai Baba, 1937 in New Zealand (Gastropoda: Opisthobranchia). Journal of Molluscan Studies, 67(4), pp. 491-499. |
Reproductive type (?) | Sexual References: Miller, M. C. 2001. Descriptions of the dorid nudibranchs Polycera hedgpethi Marcus, 1964 and P. fujitai Baba, 1937 in New Zealand (Gastropoda: Opisthobranchia). Journal of Molluscan Studies, 67(4), pp. 491-499. Comments: Ovotestis covers much of digestive gland, narrow common hermaphrodite duct leads forward to join subterminally, hind end of a wide, partly looped ampulla which at front end narrows to form a longish common duct which bifurcates, left branch a short, widish vas deferens, right branch a wider and longer proximal oviduct or uterine duct leading to a small sac-like fertilization chamber. |
Developmental trait (?) | Brooding References: Giacobbe, S., De Matteo, S. 2013. The potentially invasive opisthobranch Polycera hedgpethi Er. Marcus, 1964 (Gastropoda Nudibranchia), introduced in a Mediterranean coastal lagoon. Biodiversity journal, 4(2), pp. 359-364. Comments: Spawning is documented in Spring for the Faro Lagoon , whilst in the Venice Lagoo, but eggs were found in Autumn. Nevertheless, egg laying is a common stress-induced response, which does not necessarily involve reproductive success. |
Characteristic feeding method / Life stage (?) |
References (not structured): Giacobbe, S., De Matteo, S. 2013. The potentially invasive opisthobranch Polycera hedgpethi Er. Marcus, 1964 (Gastropoda Nudibranchia), introduced in a Mediterranean coastal lagoon. Biodiversity journal, 4(2), pp. 359-364. Comments: Its favourite prey, the bryozoan Bugula neritina and other congeneric species. |
Mobility / Life stage (?) |
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Salinity tolerance range (?) | Exact range: 18 - 40 |
Habitat modifying ability potential (?) | Unknown Comments: Not available. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Not known Comments: Not available. |
Known economic impact? | Not known Comments: Not available. |
Known measurable environmental impact? | Not known Comments: Not available. |
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) |
Last update by | Sandra Gečaitė, 2024-08-01 |