| The presence of aciculae and well developed parapodial lobes with cirri in Rollinschaeta clearly invites comparison with living aciculate polychaetes. |
| They have a porphyritic texture with prismatic plagioclase phenocrystals, small, aciculate plagioclase crystals and a partially devitrified, near-opaque matrix. |
| The male has the subgenital plate rostrately produced and the cerci elongate, tapering, aciculate and subfalciform. |
| The cheilocystidia are scattered to abundant, aciculate or with the midportion somewhat enlarged and the apex forked or branched, and give rise to two or several contorted finger-like projections. |
