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Schachriomonia pentagonia

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Schachriomonia pentagonia (Fang in Liu and Fang, 1990) from collection AFT-X 398. Note the distinctive tongue at the anterior commissure formed by the dorsal fold with two ribs that form a median furrow and a ventral sulcus that usually contains a single rib. (1–5) NIGP 168779: (1) dorsal, (2) ventral, (3) lateral, (4) anterior, and (5) posterior views. (6–10) NIGP 168780: (6) dorsal, (7) ventral, (8) lateral, (9) anterior, and (10) posterior views. (11–15) NIGP 168781, (11) dorsal, (12) ventral, (13) lateral, (14) anterior, and (15) posterior views. (16–20) NIGP 168782, neotype, (16) dorsal, (17) ventral, (18) anterior, (19) posterior, and (20) lateral views. (21–25) NIGP 168783, (21) dorsal, (22) ventral, (23) lateral, (24) anterior, and (25) posterior views. All shells are photographed at the same scale.

Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) from collection A... Available to Purchase

Published: 01 November 2019
Figure 4. Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) from collection AFT-X 398. Note the distinctive tongue at the anterior commissure formed by the dorsal fold with two ribs that form a median furrow and a ventral sulcus that usually contains a single rib. ( 1–5 ) NIGP 168779
Image
Serial sections of a small Schachriomonia pentagonia (Fang in Liu and Fang, 1990) shell (collection horizon AFT-X 398, specimen no. NIGP 168787). Numbers represent distance (in millimeters) of each section from the most posterior point on the ventral umbo. Dorsal valve uppermost. Speckled region indicates coarse calcite crystals that often fill the mantle cavity in shells from this collection horizon. Despite sectioning several small shells, no spiralia were preserved. The spiralia in these small shells were likely thin and fragile and may have been more easily damaged or dissolved during burial or diagenesis. Most of the outermost layers of the shell are missing, and in some cases, much of the exterior shell surface has been abraded.

Serial sections of a small Schachriomonia pentagonia (Fang in Liu and Fan... Available to Purchase

Published: 01 November 2019
Figure 5. Serial sections of a small Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) shell (collection horizon AFT-X 398, specimen no. NIGP 168787). Numbers represent distance (in millimeters) of each section from the most posterior point on the ventral umbo. Dorsal valve uppermost
Image
Serial sections of a large Schachriomonia pentagonia (Fang in Liu and Fang, 1990) shell (collection horizon AFT-X 398, specimen no. NIGP 168788). Numbers represent distance (in millimeters) of each section from the most posterior point on the ventral umbo. Dorsal valve uppermost. Dotted region indicates coarse calcite crystals that often fill the mantle cavity in shells from this collection horizon. Despite this, the spiralia are well preserved in this specimen although they are slightly offset toward the left side of the shell, perhaps due to damage to the brachidial supports after death of the brachiopod.

Serial sections of a large Schachriomonia pentagonia (Fang in Liu and Fan... Available to Purchase

Published: 01 November 2019
Figure 6. Serial sections of a large Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) shell (collection horizon AFT-X 398, specimen no. NIGP 168788). Numbers represent distance (in millimeters) of each section from the most posterior point on the ventral umbo. Dorsal valve uppermost
Image
Damaged Schachriomonia pentagonia (Fang in Liu and Fang, 1990) shells with spiralia exposed (collection horizon AFT-X 398). (1) NIGP 168784, dorsal view showing seven whorls on the left side of the mantle cavity. (2) NIGP 168785, dorsal view showing seven whorls of the spiralium on the left and four whorls of the incompletely exposed spiralium on the right. (3) NIGP 168786, a smaller shell showing six whorls of the right spiralium in an obliquely oriented cross section of the shell; posterior is on left.

Damaged Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) shells w... Available to Purchase

Published: 01 November 2019
Figure 7. Damaged Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) shells with spiralia exposed (collection horizon AFT-X 398). ( 1 ) NIGP 168784, dorsal view showing seven whorls on the left side of the mantle cavity. ( 2 ) NIGP 168785, dorsal view showing seven whorls of the spiralium
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Length/width, thickness/width, and thickness/length linear regression plots of Schachriomonia pentagonia from Tarim in Northwest China and Schachriomonia dichotoma from the Zhejiang–Jiangxi border region in South China for comparison. Note that the shell outlines are very similar in these species, but S. pentagonia is generally more convex in profile than S. dichotoma from South China.

Length/width, thickness/width, and thickness/length linear regression plots... Available to Purchase

Published: 01 November 2019
Figure 8. Length/width, thickness/width, and thickness/length linear regression plots of Schachriomonia pentagonia from Tarim in Northwest China and Schachriomonia dichotoma from the Zhejiang–Jiangxi border region in South China for comparison. Note that the shell outlines are very similar
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Figure showing patterns of growth over a sequence of Schachriomonia pentagonia shells at different stages of growth. Scale is constant for all specimen photos to highlight differences. (Note: these shells are also shown in full in Fig. 5.) Dorsal, lateral, and anterior views are shown in conjunction with plots of length/width, thickness/width, and sulcus depth/width. Length, width, and thickness are in millimeters. Plots include a power law trend line of best fit with x and y intercept values of zero (except sulcus versus width, which have nonzero x and y intercepts) with a 95% confidence interval. The equations for each trend line are provided above each graph.

Figure showing patterns of growth over a sequence of Schachriomonia pentag... Available to Purchase

Published: 01 November 2019
Figure 9. Figure showing patterns of growth over a sequence of Schachriomonia pentagonia shells at different stages of growth. Scale is constant for all specimen photos to highlight differences. (Note: these shells are also shown in full in Fig. 5 .) Dorsal, lateral, and anterior views
Journal Article

Paleogeographic and paleoecological significance of Schachriomonia (Brachiopoda) from the Upper Ordovician of the Tarim Basin, Northwest China Available to Purchase

Colin D. Sproat, Renbin Zhan
Published: 01 November 2019
Journal of Paleontology (2019) 93 (6): 1075–1087.
DOI: https://doi.org/10.1017/jpa.2019.35
...Figure 4. Schachriomonia pentagonia (Fang in Liu and Fang, 1990 ) from collection AFT-X 398. Note the distinctive tongue at the anterior commissure formed by the dorsal fold with two ribs that form a median furrow and a ventral sulcus that usually contains a single rib. ( 1–5 ) NIGP 168779...
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Summary statistics for the measurements of 244 conjoined Schachriomonia pe... Available to Purchase

Published: 01 November 2019
Table 1. Summary statistics for the measurements of 244 conjoined Schachriomonia pentagonia shells from the Hadabulaktag Formation in Northwest China. L = length of shell from anterior to posterior; W = lateral width; T = thickness of the shell from the most dorsal point to the most ventral