Canaliparva circularis Furlong et McRoberts, 2014
| ID | 15968 |
|---|---|
| Fossil group | Bioerosional trace fossils |
| Taxon | Canaliparva circularis |
| Author | Furlong et McRoberts, 2014 |
| Reference | Furlong & McRoberts, 2014 |
| Parent taxon | Canaliparva |
| Is valid | Yes |
| FAD | Givetian |
| LAD | Givetian |
Synonymy
| Year | Synonym | Author | Pages | Figs | Reference |
|---|---|---|---|---|---|
| 2019 | Canaliparva circularis Furlong & McRoberts, 2014 | Wisshak, Knaust & Bertling | 8 | Wisshak et al., 2019a | |
| 2014 | Canaliparva circularis n. isp. | Furlong & McRoberts | 139 | 5.2, 5.5–5.8, 6.3–6.6 | Furlong & McRoberts, 2014 |
Type specimens
| Type | Number | Repository | Type locality | Loc. | Type horizon | Strat. | Remarks | Reference | ID |
|---|---|---|---|---|---|---|---|---|---|
| holotype | NYSM 18223 | New York State Museum, Albany | Rose Hill Quarry | Givetian | Otisco Member, Ludlowville Formation | Furlong & McRoberts, 2014 |
Descriptions and remarks
Diagnosis.—Cylindrical tunnels, straight to moderately curved, circular in cross section with an average diameter of 0.2 mm,
variable in length; branching/forking infrequently; walls smooth. Fully developed tunnels are vertically U-shaped, entering and
exiting at very low angles to shell surface; tunnel entrances and exits vary from circular to elliptical. Tunnels that are not U-shaped may terminate with a tapering or swollen end, or maintain a uniform diameter along the length of the tube. All are located within the upper and middle shell substrate of the host.
Description.—Simple, shallowly vertical U-shaped tunnels, with apertures at low angles to shell surface (Fig. 5.4). Tunnels are straight to moderately curved, with uniform diameters, infrequently possess swollen or tapering chambers (when a U-shape was not fully developed), oriented upright, inclined or parallel to the substrate surface; clavate chambers only slightly larger than neck and aperture. Tunnels have smooth walls, are circular in cross section (mean diameter of 0.2 mm) and are variable in length; branching/forking is infrequent (7.2%) and tunnels possess no indicators of a significant lining. Tunnel entrances are circular to elliptical but are not typically preserved. Tunnels are located within primary and secondary shell substrate; oriented parallel, perpendicular or at various angles to host growth lines with no specific preference.
Microboring; substrate calcareous; tracemaker invertebrate