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Dicellograptus gravis
Taxonomy
Dicellograptus gravis was named by Keble and Harris (1925). It is not extant.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1925 | Dicellograptus gravis Keble and Harris p. 516 figs. pI. 70, fig. 2a-b |
| 1997 | Dicellograptus gravis Goldman and Bergström pp. 984 - 986 fig. 15n |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dicellograptus gravis Keble and Harris 1925
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Goldman and S. M. Bergström 1997 | Axial angle approximately 30°. Axil rectangular and stout. Stipe width 0·56 mm at the level of the thll aperture, increasing to 0·92 mm at the aperture ofth81• Thll and thl 2 with apertural spines; all subsequent thecae with prominent mesial spines. Supragenicular walls with a distinct bend at the position of the mesial spine. Thecal apertures strongly introverted proximally, less so distally. The free portion of the sicula missing, apparently from resorption. |