AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Proasellus coxalis [WoRMS] | |
Authority | Monod, 1924 | |
Family | Asellidae | |
Order | Isopoda | |
Class | Malacostraca | |
Phylum | Arthropoda | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Not known Comments: as origin Mediterranean region is assumed |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual |
Developmental trait (?) | Brooding References: VLIZ Alien Species Consortium (2020). Proasellus coxalis. Non-native species of the Belgian part of the North Sea and bordering estuaries anno 2020. Flemish Institute for the Sea (VLIZ). 5 pp. Comments: Like most freshwater isopods, this species carries fertilized eggs in a brood pouch until all larval stages are completed. Some plates connected to the first five pairs of legs slide like roof tiles over each other and form the brood pouch |
Characteristic feeding method / Life stage (?) |
Comments: They feed on dead organic material. |
Mobility / Life stage (?) |
Comments: As poor swimmers, freshwater isopods are mainly found between water plants, between stones and on the bottom, where they feed on dead organic matter. |
Salinity tolerance range (?) | Venice system: 1. Limnetic [<0.5psu] 2. β-Oligohaline [0.5-3psu] 3. α-Oligohaline [3-5psu] References: VLIZ Alien Species Consortium (2020). Proasellus coxalis. Non-native species of the Belgian part of the North Sea and bordering estuaries anno 2020. Flemish Institute for the Sea (VLIZ). 5 pp. Comments: P. coxalis is a typical freshwater species, it can thrive in brackish water, such as in estuaries. The species can be found in German and Belgian waterways at salinities up to 5 PSU. |
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) |
Association with vessel vectors (?) | Unknown Comments: Since 1931, this species spread across Western Europe, probably as a stowaway in the ballast water of inland vessels. |
Created by | Stephan Gollasch, 2012-09-10 |
Last update by | Sandra Gečaitė, 2024-07-23 |