triserial

triserial

(traɪˈsɪərɪəl)
adj
arranged in three rows or series
References in periodicals archive ?
Planispiral (globigerinelloids) and trochospiral (hedbergellids, rugoglobigerinids and globotruncanids) species are frequent, and triserial species (guembelitriids) and tubulospinose species (schackoinids) are rare.