Caridina spongicola

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Wrote by Ankou92, translated by Logow

Caridina spongicola
K. Von Rintelen (Ex Zitler) & Y. Cai, 2006.

See taxonomyCommon names:

  • Sponge Shrimp

Origin : South West of the lake Towuti, the biggest and the most southern lake in the Malili complex on the island of Sulawesy in Indonesia. (maps : Sulawesy/ Lac Towuti)

Water specifications :

  • pH : 7,5 to 8,5
  • GH : 4 to 8
  • KH: 4 to 6
  • Temperature : 26 to 29 °C / 78.8 to 84.2 °F

Size :

  • Male : 1 to 2,5cm
  • Female : 1 to 2,5cm

Description : The Caridina spongicola presents an incredible colouration pattern. The disposition of the red stripes and the shape of the rostrum really remind of marine genus shrimps Rhynchocinetes durbanensis. The translucent background colouration of Caridina spongicola displays three vertical red lines on the cephalotorax. The extremity of the periopods is red to orange in colour. The top of the head is underlined with a vertical stripe red/orange in colour that continues around the eyes and on the antenna pods and onto the antenna who are very developed. The rostrum is also relatively long. The rostrum,the antenna pods and the antenna represent nearly 1/6th of the body size. The eggs are of black colour and are relatively big (0.8-0.9 x 0.4-0.6 mm) which might indicate a direct reproduction cycle. The rostrum, straight and slender, presents a lot of variations on the studied populations : 11-19+3-5 spikes on the dorsal side, et 4-10 spikes on the ventral side.

Behaviour : Gregarious specie, real little colonies can form on a single sponge. There has been countings done and 137 individuals where living on one single sponge.

Life span : Unknown

Feeding habits : Difficult because of the interdependent relationship between this shrimp and freshwater sponges. It would use the cavities in the sponge as a hide out and take advantage of the abundance of diatomea as food stock.

Sexual dismorphism (def. ) :unknown

Reproduction : The eggs black in colour are relatively big (0.8-0.9 x 0.4-0.6 mm). It would see to be a direct type reproduction without any larval stages. The complete incubation, hatching and growth would take place in fresh water conditions. The amount of eggs is very small around 12 per incubation.

Warning : It is important to note that this shrimp is not the Harlekin shrimp (Harlekingarnele) that can be found in shops since the past few weeks. That shrimp is actually called Caridina cf. spongicola, but hasn’t been described yet. An index specific to this shrimp should soon be available on Crusta-Fauna.

Links :

Sources (Bibliography) :

  • Biology Letter. (2007) 3, 262-264. doi:10.1098/rsbl.2006.0613, Published online 8 March 2007 (pdf)
  • K. Von Rintelen (Ex Zitler) & Y. Cai (2006), Caridina spongicola, new species, a freshwater shrimp (Crustacea : Decapoda : Atyidae) from the ancient Malili lake System of Sulawesi, Indonesia. The Raffles Bulletin of Zoology 54(2) : 273-278

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