Planolites annularius Walcott, 1890

Taxon description

Hammersburg et al., 2018

Diagnosis.—Horizontal, straight to curved, subcylindrical burrows with pronounced annulations (Pemberton & Frey, 1982; Fillion & Pickerill, 1990).


Pickerill & Fyffe, 1999

Description: Straight, smooth, unlined, unbranched, horizontal burrow, somewhat flattened, 23 mm in length and 1.5 mm wide, preserved in positive hyporelief on the sole of NBMG 10287 (see C. montanus for details). The burrow is characterized by regularly spaced, 0.3 mm wide, annulations oriented slightly obliquely to its long axis. Small size precludes determination of its fill, though this appears to be similar to the host rock.

Pemberton & Frey, 1982

Predominantly horizontal, straight to sinuous or undulose burrows exhibiting prominent annulations. Annuli may be of regular or irregular size and spacing; otherwise, burrows tend to be more or less constant in diameter. Most are stright to slightly curved, and are oriented parallel to subparallel to bedding. True branching has not been observed. Preserved primarily as hypichnal ridges and shallow endichnia; undulose specimens may exhibit both preservations.

Synonymy list
1890     Planolites annularis — Walcott, pp. 34
1890     Planolites annularis — Walcott, pp. 602, fig. 60:5
1982     Planolites annularis Walcott, 1890 — Pemberton & Frey, pp. 869, fig. 1:11
1985     Planolites annularius Walcott, 1890 — Crimes & Anderson, pp. 330, fig. Figure 10.7, 10.8
1989     Planolites annularius Walcott, 1890 — Orłowski, pp. 217, fig. 13:5,6
1999     Planolites annularius Walcott, 1890 — Pickerill & Fyffe, pp. 221, fig. 2a,b
2003     Planolites annularius Walcott, 1890 — Kim & Pickerill, pp. 48, fig. 4G
2018     Planolites annularius Walcott, 1890 — Hammersburg et al., pp. 31, fig. Fig.15.2