subitaneous

1. (obsolete) Sudden; suddenly done or made.obsolete

2. (of the young of a species) Immediately developing (as contrasted with e.g. diapausing).Examples: "... subitaneous (immediately developing) and diapausing (dormant) eggs, brood retention, environmental sex determination and suppression of meiosis in subitaneous eggs. The production of subitaneous and diapausing eggs is[…]"; "... subitaneous or resting. This is enough to make the Calanoida eggs (about 104–106 m-2 of bottom area) more abundant than those of Rotifera (about 104 m-2) and Cladocera (about 103–105 m-2) in sediment assemblages (Hairston 1996). Among[…]"; "... subitaneous offspring (Arbačiauskas 1998). The larger early fecundity at high food concentrations resulted in higher fitness of post-diapause females also in D. magna; however, a trend for a higher fitness in subitaneous offspring was[…]"