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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.

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

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

Occurrences:
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.

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

Holotype:
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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