Glossopleura mohavensis Resser, 1935

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 mohavensis Resser, 1935

Figures 10B–F , 11G and 11H

Dolichometopus productus Resser, 1928, p. 10 , pl. 3, fig. 9.

Dolichometopus productus Hazzard and Crickmay, 1933, p. 73 .

Dolichometopus productus Mason, 1935, p. 113 – 114.

Glossopleura mohavensis Resser, 1935, p. 34 Glossopleura mohavensis Hazzard and Mason, 1936, p. 233 .

Sonoraspis californica Stoyanow and Susuki, 1955, p. 468 –469, pl. 1, figs. 1, 2.

Sonoraspis mohavensis Stoyanow, 1956, p. 680 – 681, fig. 1.

Sonoraspis nelsoni Stoyanow, 1958, p. 348 –349, pl. 1, fig. 3.

Sonoraspis californica Susuki and Lumsden, 1962, p. 234 –237, fig. 2.

Glossopleura californica Fuller, 1980, p. 68 .

Type specimens. Holotype USNM 78400 b, nearly complete specimen.

Occurrence. Cadiz Formation, Marble Mountains , California; Monola Formation, Inyo Mountains, California; Pole Canyon Formation, Currant Gap, Nevada. Glossopleura Assemblage Biozone, Interval Biozone (Morgan, 2021) undesignated, (Wuliuan, Miaolingian).

Material examined. USNM 78400b, LACMIP 2469, LACMIP 10785, LACMIP 10786, LACMIP 10782, MWC 7779, MWC 7769.

Remarks. Species features moderately long eyes, short pleural spines on all thoracic segments, and eight thoracic segments in seven complete specimens (USNM 78400b, LACMIP 2469, LACMIP 10782, LACMIP 10785, LACMIP 10786, MWC 7779, MWC 7769).

Figures

FIGURE 10. Dolichometopid trilobite specimens from the Cadiz Formation, California. A) Glossopleura lodensis (USNM 78400a), note eight thoracic segments, elongate T5 pleural spines, anteriorly expanded glabella, and long eyes (impression, lighting from left). B) Glossopleura mohavensis (USNM 78400b), note eight thoracic segments (dorsal exoskeleton, lighting from left). C) Glossopleura mohavensis (LACM 10785; “Sonoraspis californica”), note wide glabella, eight thoracic segments, and axial spine bases (impression, lighting from left). D) Glossopleura mohavensis (LACM 10786; “Sonoraspis californica”), note wide glabella, eight thoracic segments, and axial spine bases (impression, lighting from left). E) Glossopleura mohavensis (MWC 7769), note eight thoracic segments (dorsal exoskeleton, lighting from left). F) Glossopleura mohavensis (MWC 7779), (dorsal exoskeleton, lighting from left). A and B from the Bristol Mountains; C and D from near Section A of Foster (1994) (type section; north of Route 66), Marble Mountains; E and F from UCR 7359, near Section B of Foster (1994) (south of Route 66), Marble Mountains. All scale bars = 1 cm.

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.