| They have a porphyritic texture with prismatic plagioclase phenocrystals, small, aciculate plagioclase crystals and a partially devitrified, near-opaque matrix. |
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| 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. |
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| The presence of aciculae and well developed parapodial lobes with cirri in Rollinschaeta clearly invites comparison with living aciculate polychaetes. |
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| The male has the subgenital plate rostrately produced and the cerci elongate, tapering, aciculate and subfalciform. |
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