APHOTOMARINE

An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

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Janirid isopod
Jaera (Jaera) forsmani
- dorsal view 1

Janirid isopod
Jaera (Jaera) forsmani
- lateral view 1

Janirid isopod
Jaera (Jaera) forsmani
- ventral view 1

Janirid isopod
Jaera (Jaera) forsmani
- with 0.1mm division rule 1

Janirid isopod
Jaera (Jaera) forsmani
- pereopod 7 -1

Janirid isopod
Jaera (Jaera) forsmani
- pereopods 1 and 2 -1

Janirid isopod
Jaera (Jaera) forsmani
- praeoperculum 1

Janirid isopod
Jaera (Jaera) forsmani
- washings / sample from crevice where specimen was found 1

Janirid isopod
Jaera (Jaera) forsmani
- habitat / location 1

A 2.3mm male specimen was found in a rock crevice on the lowershore at Little London reef, Marazion, Cornwall, 09.12.17.

In Jaera (Jaera) forsmani pereopods (legs) 1-4 are sparsely covered with curved setae on the propus, carpus and merus segments. Perepods 6 and 7 have well developed carpal spines. In comparison Jaera (Jaera) albifrons has prominent lobes that are fringed with spines on the carpus of pereopods 6 and 7. The male praeoperculum of Jaera (Jaera) forsmani is simlar to Jaera (Jaera) albifrons so cannot be used to distinguish the species. Jaera (Jaera) forsmani is the least tolerant of freshwater of the Jaera albifrons group.

Species was kindly verified by the isopod expert Dr. David Holdich.

The main objective of this website is in furthering environmental awareness and education through the medium of photography. To increase awareness and access to the wildlife of the region and help

people find and identify it. Sometimes the difference between species is obvious but many species can only be determined by observing microscopic characteristics that are specific to any one species.