triserial

triserial

(traɪˈsɪərɪəl)
adj
arranged in three rows or series
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.