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Ceratocyrtis manumi Goll and Björklund, 1989

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A species of Ceratocyrtis characterized by a broad, lowdomed cephalis and an hour-glass shaped thorax. This species' skeleton specifically consists of two moderately thin-walled and uniformly perforated lattice chambers. The densely perforated cephalis is broad, low-domed and not significantly recessed within the thoracic chamber. Numerous short spines project upwardly from the cephalis. Two larger spines are the A- and V-processes. Only a slight constriction separates the cephalis and thorax. Upper margin of the thorax is conical, swells broadly, and is chaotically spinous. Three prominent lattice processes originate at the LL and D bars, are joined to the upper thorax, and project laterally from its margin as free spines on some specimens. The long thorax is horizontally constricted at mid-length and swells again distally above an irregular terminal margin.

The species is named in honor of Professor Svein Manum, University of Oslo.

Ceratocyrtis manumi is distinguished from Gondwanaria nigrinae by its more loosely trellised lattice composition and significantly different cephalic morphology.

Ceratocyrtis manumi has a trace occurrence in Section 104-642B-22H, CC and is consistently present in Section 104-643A-17H, CC to Sample 15H-5, 105-107 cm.

126-148 μm, maximum height; 122-130 μm, maximum thoracic width.

PMO 117.585; Sample 104-643A- 16H-3, 105-107 cm; England Finder X25/4; PL 5, Figs. 21-23.
Goll and Björklund 1989











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