Home Introduction What is an ostracod? World species list Southern Ocean list About the authors Bibliography Acknowledgements Links Last updated 14 March 2008 Southern Ocean list > Proceroecia brachyaskos > Notes Proceroecia brachyaskos Drawings   Maps Download species PDF Proceroecia brachyaskos (Müller, G.W., 1906) Records: 171 This species has been regularly reported from the Southern Ocean, although seldom in abundance. It has also been regularly reported as a deep mesopelagic and/or bathypelagic species at low latitudes in all three major oceans. However, there are clear size differences between some of these populations as shown by the size data given below. In the North Atlantic occasional large specimens, consistent in size with the Southern Ocean population, are found at depths of >1500m. It seems likely that the present species concept includes at least two cryptic species. The larger forms found in the North Atlantic may prove to be indicators of the deep water spreading northwards from the Southern Ocean. Typical form Southern Ocean n Mean mm s.d. Range mm Female 17 1.60 0.027 1.54-1.64 Male 18 1.48 0.027 1.42-1.54 A-1 19 1.33 0.054 1.22-1.40 A-2 14 0.98 0.044 0.90-1.04 A-3 2     0.78-0.80                     Small form Tropical Atlantic n Mean mm s.d. Range mm Female 203 1.36 0.063 1.20-1.50 Male 12 1.30 0.022 1.26-1.34 A-1 185 1.12 0.063 1.00-1.28 A-2 88 0.92 0.048 0.82-1.04 A-3 37 0.75 0.028 0.70-0.80