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Spirocyrtis gyroscalaris Nigrini, 1977

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Similar to S. scalaris, but the outline of the segments is rounded rather than angular; it is generally narrower than S. scalaris becoming broader in younger sediments as it evolves into S. scalaris. Duck-billed vertical tube and three-bladed apical horn both well developed. Seven to nine segments of variable length with two to five rows of subcircular to rectangular pores per segment. Termination ragged.
Dimensions (based on 10 specimens): total length 130-180; maximum breadth 75-105.
Nigrini 1977


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