Glossopleura boccar (Walcott, 1916a), 1927

Foster, John R., 2022, Continuous character variation within the Glossopleura-Anoria-Sonoraspis plexus: Dolichometopid trilobites from the Cadiz Formation (Cambrian: Miaolingian, Wuliuan), California, Palaeontologia Electronica (a 18) 25 (2), pp. 1-25 : 16

Glossopleura boccar (Walcott, 1916a)

Figure 11A–B and 11D–E

Dolichometopus boccar Walcott, 1916a, p. 363 – 365, pl. 52, figs. 1a– 1f.

Dolichometopus productus (Hall and Whitfield,

1877) (part) Walcott, 1916a, p. 369–372, pl.

53, figs. 4, 4a.

Glossopleura boccar (Walcott) Poulsen, 1927 , p.

268.

Glossopleura mckeei Resser, 1935, p. 33 .

Glossopleura bosworthensis Resser, 1935, p. 31 .

Glossopleura nitida Resser, 1935, p. 31 .

Glossopleura? stephenensis Resser, 1935, p. 31 .

Glossopleura boccar (Walcott) Rasetti, 1951 , p.

164, pl. 24, figs. 1–6.

Glossopleura mckeei (Resser) Rasetti, 1951 , p.

165, pl. 24, figs. 9–12, 18.

Glossopleura boccar (Walcott) Sundberg, 2005 , p.

65–66, fig. 6.10–6.14.

Glossopleura boccar (Walcott) Foster, 2011b , p.

105–106, fig. 4.1, 4.2, 4.3.

Glossopleura boccar (Walcott) Morgan, 2021 , p.

94–97, figs. 3.5.1, 3.5.2, 3.5.4–3.5.11

Type specimens. USNM 62703 , USNM 62705 , and USNM 62707 , cotypes .

Occurrence. Stephen Formation, Mount Bosworth and Mount Stephen, British Columbia; Mount Cap Formation, Northwest Territories; Chisholm Formation, Half Moon Mine, Pioche, Nevada; Bright Angel Formation, Grand Canyon, Arizona; all Glossopleura Assemblage Biozone , Glossopleura boccar Interval Biozone (Morgan, 2021) , (Wuliuan, Miaolingian).

Material examined. USNM 62703, USNM 62702, USNM 62705, USNM 62707, USNM 62713, USNM 62714, USNM 108592a, USNM 108592b, USNM 108592c, SGDS 1973–1976.

Remarks. This is the type species of the genus Glossopleura , and although it has not been identified in the Cadiz Formation , it is close in form to G. mohavensis except for having longer eyes and only seven thoracic segments.

Morgan (2021) proposed restricting Glossopleura boccar to USNM 62703 as a lectotype and USNM 62705 as a syntype / paratype, with USNM 62707 as a hypotype of G. walcotti .

Figures

FIGURE 11. Some representative dolichometopids from other formations included in this study. A–B and D–E) Glossopleura boccar. C) Glossopleura similaris(?) F) Anoria tontoensis. G–H) Glossopleura mohavensis. A) USNM 62703, type of Glossopleura boccar, from the Stephen Formation. B) USNM 62702, specimen originally assigned to G. stephenensis, from the Stephen Formation. C) KUMIP 314054, G. similaris(?), from the Spence Shale (Langston Formation). D) SGDS 1975, G. boccar, from the Chisholm Formation. E) USNM 62714, specimen originally assigned to G. mckeei, from the Bright Angel Formation. F) USNM 62685, Anoria tontoensis, from the Bright Angel Formation. G) LACMIP 10782, specimen originally assigned to “Sonoraspis nelsoni”, from the Monola Formation. H) LACMIP 2469/24444.1, specimen originally assigned to “Sonoraspis californica”, from the Pole Canyon Formation. (Image in D courtesy of Andrew R.C. Milner. G and H courtesy LACM: Hendy, A., Walker, L., Mertz, W. [2020]. LACM Invertebrate Paleontology. Version 1.9. Natural History Museum of Los Angeles County. Occurrence dataset https://doi.org/ 10.15468/6nxzen accessed via GBIF.org on 2021-03-23.) All scale bars equal 1 cm.