Purple Octopus - using citizen science to discover marine interactions
This is the entity page showing aggregated messages and images for the named entity.

Processa modica

Williamson in Williamson & Rochanaburanon, 1979

Erling Svensen This shrimp is a big problem for me. Only 2 cm long (many much smaller). On sandy/muddy bottom, shallow (down to 10 meter). I see the shrimp only during night diving. And the shrimp digs down when using the torch on it - with the head first. Very strange. Any suggestions?

Peter H van Bragt Could be a Processa sp. You need to collect one for a definite id

Erling Svensen I have three of them here on my desk in a glass with 98% alcohol......

Erling Svensen They are no on the way to Torleiv Brattegard at the University in Bergen. Looking forward to know the answere.

Marco Faasse Certainly Processa as Peter said. For further ID we'll have to wait for Torleivs results ...

Erling Svensen I felt thay this shrimp had some glowing spots like the krill has. But the strange thing is that they dig down with head first when I use the light on them. Not like the Crangon that just sink down in the seabed.

Peter H van Bragt This head first hiding in the bottom is highly characteristic for Processa

Marco Faasse Yes, Crangon also digs with swimming legs, Processa with anterior appendages :-)

Erling Svensen Peter - is it possible to see the details needed for the 4 different species in a picture?

Marco Faasse I don't think so, but the colour pattern is similar to that of Processa modica.

Erling Svensen Back home. When looking in the "big book" - "Distribution of marine, benthic macroorganisms in Norway" where all registrated species are - there is only one Processa in Norway, the Processa canaliculata. But there could of course be some others that not are on the list yet. What you think?

Marco Faasse I think little is known of this genus. According to the British shrimp book (Smaldon 1993) none of the 4 British species, including P. canaliculata, occurs further north in the world than NE England ... Maybe you have gathered important new info now ...

Peter H van Bragt If you can send a cropped but highly detailed image of the last two segments before the tail we may be able to see an anatomically feature of P. canaliculata

Peter H van Bragt But just to let you know. The P. cana's that I have seen had little or no pigmentation.p

Erling Svensen Torleiv sayes: These are Processa modica modica Williamson & Rochanaburanon, 1979. So a new species for Norway and for me. A bottle of red wine is waiting :-)

Marco Faasse Congratulations! Enjoy your wine :-) Evidently not everything is in the books ... This is important as a confirmation of the colour pattern as well.

Peter H van Bragt Indeed do enjoy the wine. Always exciting to be able to add a new species to the national Biodiversity list. Cheers.

Message posted on Seasearch Identifications on 01 Nov 2013
Animalia (Kingdom)
  Arthropoda (Phylum)
    Crustacea (Subphylum)
      Malacostraca (Class)
        Eumalacostraca (Subclass)
          Eucarida (Superorder)
            Decapoda (Order)
              Pleocyemata (Suborder)
                Caridea (Infraorder)
                  Processoidea (Superfamily)
                    Processidae (Family)
                      Processa (Genus)
                        Processa modica (Species)
Associated Species