Compare Cocconeis coreana

Compare

Cocconeis coreana belongs to C. placentula species complex, included as C. placentula sensu lato in this database. We recommend that practitioners use Cocconeis placentula sensu lato for most ecological assessments.

Recent molecular studies of freshwater unialgal strains of Cocconeis (Jahn et al., 2009, 2020, Romero and Jahn 2013, Mora et al. 2021) set the baseline for defining species within this group typifying several well-known species hard to classify solely based on morphology.

Cocconeis coreana is morphologically most similar to C. lineata (as epitypified by Romero and Jahn 2013), which differ by its smaller finer frustules, rapheless valves with delicate and denser areolae (12-26 in 10 µm), raphe vlave with more parallel striae and smooth valvocopula.

Cocconeis placentula and C. euglypta (as epitypified by Jahn et al. 2009 and Romero and Jahn 2013) have rapheless valves with areolae organized into fewer longitudinal lines per hemivalve (maximum 6).

Cocconeis czarneckii has proportionally wider valves, more radiate striae on both valves, rapheless valves with finer and denser areolae (13-20 in 10 µm), raphe valve with more submarginal areolae, forming longer rows in the middle of the valves, and valvocopula with more delicate fimbriae.