timidonella timidonella timidonella is a genus of large middle jurassic forams, with microspheric tests up to 8 millimetres (0.31 in) in diameter. smaller megalospheric tests may be fan-shaped or kidney-shaped to discoidal with breadths to slightly over 2 mm and a constant thickness equal to that of the proloculus. chambers are numerous. the wall, microgranular calcareous, agglutinated. timidonellatemporal range: toarcian~ scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria subphylum: foraminifera class: globothalamea order: loftusiida family: spirocyclinidae genus: timidonellabassoullet et al 1974 timidonella has been found in the middle jurassic of france, italy, sardinia, iran, and madagascar. spiraloconulus, streptocyclammina, and spirocyclina are among related genera.