AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Pyura tessellata [WoRMS] | |
Authority | (Forbes, 1848) | |
Family | Pyuridae | |
Order | Stolidobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | Cynthia tessellata | |
Sub-species level (?) | Not entered |
Native origin (?) | Not entered |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
References (not structured): Svane, I., Lundälv, T. 1982. Persistence stability in ascidian populations: longterm population dynamics and reproductive pattern of Pyura tessellata (Forbes) in Gullmarfjorden on the Swedish west coast. Sarsia, 67(4), pp. 249-257. Comments: This solitary ascidian has a scaly appearance to the test and is normally found beneath rocks. The siphons are short and are placed at each end of the rather flattened body. 5mm tall by 15mm broad. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual References: Svane, I., Lundälv, T. 1982. Persistence stability in ascidian populations: longterm population dynamics and reproductive pattern of Pyura tessellata (Forbes) in Gullmarfjorden on the Swedish west coast. Sarsia, 67(4), pp. 249-257. |
Developmental trait (?) | Spawning References: Svane, I., Lundälv, T. 1982. Persistence stability in ascidian populations: longterm population dynamics and reproductive pattern of Pyura tessellata (Forbes) in Gullmarfjorden on the Swedish west coast. Sarsia, 67(4), pp. 249-257. Comments: Reproduction took place in August–September. The number of ova found in gonads in August was low and the total number of spawned eggs in an average-sized animal was 6 600–16 400. Reproduction coincided with the highest water temperature at 20 m depth. |
Characteristic feeding method / Life stage (?) |
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Mobility / Life stage (?) |
Comments: Usually found beneath rocks in sites exposed to wave action or tidal streams, where there is no sediment beneath the rocks except coarse gravel. |
Salinity tolerance range (?) | Unknown Comments: Not available. |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers References: Svane, I., Lundälv, T. 1982. Persistence stability in ascidian populations: longterm population dynamics and reproductive pattern of Pyura tessellata (Forbes) in Gullmarfjorden on the Swedish west coast. Sarsia, 67(4), pp. 249-257. |
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 [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Unknown Comments: Not available. |
Created by | Aleksas Narščius, 2017-10-11 |
Last update by | Sandra Gečaitė, 2024-08-20 |