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.

A-P-H-O-T-O Wildlife Stock Image Library
Jaera (Jaera) ischiosetosa Forsman, 1949 - A janirid isopod (Isopoda images)
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Janirid isopod
Jaera (Jaera) ischiosetosa
- male dorsal view 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- curved setae on the distal portion of the ischium on pereopod 6 of a male specimen 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- curved setae on the distal portion of the ischium on pereopod 6 of a male specimen 2

Janirid isopod
Jaera (Jaera) ischiosetosa
- habitat / sample site 1

A single male specimen was found with two females in a sample collected by washing stones from pools and wet areas, on the north side of Great Hogus, Marazion, Cornwall, 06.01.18. Images above of the male specimen. Perepod 6 was used as hairs appeared to be in better condition than pereopod 7.

Janirid isopod
Jaera (Jaera) ischiosetosa
- male dorsal view 2

Janirid isopod
Jaera (Jaera) ischiosetosa
- male dorsal view 3

Janirid isopod
Jaera (Jaera) ischiosetosa
- female dorsal view 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male ventral view 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- ventral view of female with young in brood pouch 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- group of females 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male in-situ on rock 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male praeoperculum 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male pereopod 7 -1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male pereopod 7 -2

Janirid isopod
Jaera (Jaera) ischiosetosa
- curved setae on the distal portion of the ischium on pereopod 7 of a male specimen 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- male 0.1mm division rule 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- female 0.1mm division rule 1

Janirid isopod
Jaera (Jaera) ischiosetosa
- habitat 1

Three male specimens and over 20 female specimens, some berried were found on washing cobbles found on the lowershore in a bucket of seawater and straining the liquid. The site chosen was close to where there is a fast flowing freshwater stream coming down the shore, which seemed to be close to the reported habitat for the species. The species was found on the NE side of the reef at Lariggan Rocks, Wherry Town, Penzance, Cornwall, 04.01.17.

Janirid isopod
Jaera (Jaera) ischiosetosa
- curved setae on the distal portion of the ischium on pereopod 7 of a male specimen 2

Janirid isopod
Jaera (Jaera) ischiosetosa
- curved setae on the distal portion of the ischium on pereopod 7 of a male specimen 3

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

Species found to be abundant under loose rocks with wet bottom below the slipway in the NW corner of Newlyn Harbour, Newlyn, Cornwall, 19.02.18.

Male specimens of Jaera (Jaera) ischiosetosa possess a dense cluster of curved setae on the distal portion of the ischium on pereopods 6 and 7. Females often appear green due to the colour of their eggs.

Jaera ischiosetosa janiridae janirid isopod Marine Animal Resembling Woodlouse Isopoda Images
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.