AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Paradella dianae [WoRMS] | |
Authority | (Menzies, 1962) | |
Family | Sphaeromatidae | |
Order | Isopoda | |
Class | Malacostraca | |
Phylum | Arthropoda | |
Synonym (?) | Dynamenella dianae (Menzies, 1962) (basionym) | |
Sub-species level (?) | Not entered |
Native origin (?) | Not entered Comments: Pacific NE Tropical Atlantic Pacific NE |
Life form / Life stage (?) |
|
Sociability / Life stage (?) |
Comments: In Florida, P. dianae is one of the most abundant isopods, reaching densities of 53,000 individuals in one square meter. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual References: García-Guerrero, M., Hendrickx, M. E. 2005. Fecundity and reproductive period of Paradella dianae and Uromunna sp.(Peracarida, Isopoda) associated with prop roots of Rhizophora mangle in a tropical coastal lagoon, SE Gulf of California, Mexico. Crustaceana, pp. 769-780. Comments: P. dianae has separate sexes and fertilization is internal. However, an unusual feature of this isopod is that this species is a protogynous hermaphrodite. The young mature as females, brood and bear young, and then transform into males. |
Developmental trait (?) | Brooding Direct development References: García-Guerrero, M., Hendrickx, M. E. 2005. Fecundity and reproductive period of Paradella dianae and Uromunna sp.(Peracarida, Isopoda) associated with prop roots of Rhizophora mangle in a tropical coastal lagoon, SE Gulf of California, Mexico. Crustaceana, pp. 769-780. Comments: Ovigerous females have penises similar to those of subadult males. The young are brooded by the female and development is direct. The number of embryos increases with body size, from 14 to 24, over a size range of 2.4 to 5.6 mm. |
Characteristic feeding method / Life stage (?) |
Comments: P. dianae feeds by scraping algae and biofilms from surfaces. |
Mobility / Life stage (?) |
Comments: Paradella dianae is commonly found among intertidal algae on a variety of substrates, including rock, mud and man-made surfaces like jetties, buoys and piers. The species is often rather secretive, hiding among the heavy growth of marine invertebrates, under stones, or in the shells of dead barnacles or polychaete tubes, especially when the tide has gone down. |
Salinity tolerance range (?) | Exact range: 0 - 39 References: Smithsonian Environmental Research Center (2023) Pagurus longicarpus. Available at: https://invasions.si.edu/nemesis/species_summary/92411 (Accessed: 19 August 2024). Comments: P. dianae is widespread in warm-temperate to tropical climates (13-30°C) and tidal fresh to euhaline salinities (0-39 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 [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Biofouling Comments: They were probably carried to our coast on the outside surfaces of oceangoing ships, and they have hitchhiked around the world among the fouling growth that builds up over time on these ship’s hulls. |
Last update by | Sandra Gečaitė, 2024-08-19 |