virgatotome
adjective1
- Having multiple secondary ribs which branch off successively in front of each primary rib (resulting in a shape like ᚠ), like the ribs of Zaraiskites ammonites.
- ... polygyrate or bidichotomous to fasciculate (rarely virgatotome) ribs, more loosely spaced and coarser. External whorls of macroconch forms with dichotomous to polygyrate ribs[…] — 1977