DDG summary:
aquatic -> freshwater / marine,
grassland (2nd largest?),
forest -> tropical / temperate,
desert,
tundra,

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Wikipedia:
ice sheet / polar desert,
tundra (tree growth hindered by cold and short growing seasons; arctic, alpine, antarctic; shrubs, grasses, mosses, lichen; soil high N & P, biomass, methane, CO2, permafrost),
taiga (boreal forest, snow forest, coniferous forest; pines, spruces, larches; largest land biome),
temperate broadleaf forest,
temperate steppe and savanna,
subtropical evergreen forest,
Mediterranean vegetation,
monsoon forests and mosaic,
arid desert,
xeric shrubland,
dry steppe and thorn forest,
semiarid desert,
grass savanna,
tree savanna,
dry forest and woodland savanna,
tropical rainforest (evergreen?),
alpine tundra,
montane forests and grasslands,

alts:
deciduous forest (not evergreen - can be cold or dry to cause leaves to fall; trees, shrubs, perennials),
high plateaus (flat raised plains),

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savanna seems to just mean grassland with some shrubs and trees? (dry)
steppe is grasslands with NO trees (dry, often cold)
meadow is wet grasslands
hypoxic / anoxic waters FROM dead zones (nutrient concentration -> bloom, low water movement, high temperature; deepest waters?), gyre centers (ocean currents)

("continentalness" may be useful)

tropical just means low latitude - these are small
montane just means mountain

(one mm of rainfall == 1 L/m^3)