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hypoplankton
hypoplankton n. 
/ˌhaɪpoʊˈplæŋkt(ə)n/ plankton found in the layer of water directly above the bottom of the ocean.
Brit. /ˌhʌɪpə(ʊ)ˈplaŋ(k)tən/
, /ˌhʌɪpə(ʊ)ˈplaŋ(k)tən/U.S. /ˌhaɪpəˈplæŋkt(ə)n/
, /ˌhaɪpəˈplæŋkt(ə)n//ˌhaɪpoʊˈplæŋkt(ə)n/ΘΚΠ
the world > life > biology > organism > plankton > [noun] > types of
brit1838
limnoplankton1893
zooplankton1897
meroplankton1899
potamoplankton1899
pseudoplankton1899
cryoplankton1902
hypoplankton1902
microplankton1903
haloplankton1909
holoplankton1909
meroplankton1909
nanoplankton1912
neuston1928
aeroplankton1932
staph1933
astroplankton1954
picoplankton1978
1902 Encycl. Brit. XXXIII. 933/2 It is possible that the plankton immediately over the bottom [of the ocean] may prove to be sufficiently distinct to be separately classed as hypoplankton.
1903 Nature 5 Nov. 23/2 There is evidence that certain forms [of Copepoda] are confined to the bottom, and form part of a true hypoplankton.
1942 H. U. Sverdrup et al. Oceans xvii. 814 The swimming powers of many animals put them midway between the plankton and the nekton, and many forms..live both on or near the bottom and are sometimes called hypoplankton.
1955 C. C. Davis Marine & Fresh-water Plankton i. 28 The hypoplankton consists of plankters living near the bottom.
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