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Fig. 8 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 8. Productellidae from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash (localities RCC-, RCK-; see Fig. 3) and Wensley Dale, near Matlock (locality WI1; see Fig. 2), Derbyshire, UK. A–E. Alitaria aff. triquetra (Muir-Wood, 1928). A. MPUM11860 (RCC2-13) in anterior view. B. MPUM11861 (RCC12-2) in anterior (B1) and lateral (B2) views. C. MPUM11862 (RCC60-2) in antero-ventral view. D. MPUM11864 (RCC2-40), ventral valve in antero-ventral view. E. MPUM11866 (RCC128-13), dorsal valve in anterior view. F. Eomarginiferina trispina Brunton, 1966, MPUM11869 (WI1- 31) in ventral (F1), dorsal (F2), anterior (F3), and lateral (F4) views. G, H. Overtonia fimbriata (Sowerby, 1824). G. MPUM11870 (RCK15-1b) in ventral G1), dorsal (G2), and lateral (G3) views. H. MPUM11871 (RCK15-53) in ventral (H1) and dorsal (H2) views. I. Avonia sp., MPUM11872 (RCC128-4a), ventral valve in anterior view. J–N. Quasiavonia aculeata (Sowerby, 1814). J. MPUM11873 (RCC32-28a) in anterior view. K. MPUM11874 (RCC49- 28) in anterior (K1), postero-ventral (K2), and lateral (K3) views. L. MPUM11877 (RCC49-24) dorsal valve interior and external cast. M. MPUM11875 RCK17-2) in ventral view. N. MPUM11878 (RCK15-51) dorsal valve interior. O.?Quasiavonia sp., MPUM11883 (RCC3-11); anterior (O1), posterior O2), and lateral (O3) views. P, Q. Krotovia spinulosa (Sowerby, 1814). P. MPUM11884 (RCC54-17b) in ventral view. Q. MPUM11885 (RCC68-2) in ventral (Q1), anterior (Q2), posterior (Q3), and lateral (Q4) views.

Fig. 7 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 7. Density maps in ternary diagrams showing percentages of brachiopod biovolume for the three different ecological groups (seminfaunal productides; pedicle-attached rhynchonellides, spiriferides, and terebratulides; pedicle-attached/free-living orthotetides, orthides, spiriferides, and spiriferinides with adaptation to softgrounds), calculated for FA1 (A), FA2 (B) and some collected assemblages with more than 20 specimens from FA1 (A) and FA2 (B) (see Table 2). Diagrams plotted with PAST software (Hammer et al. 2001). Abbreviations: BIP, biovolume of seminfaunal productides; BP, biovolume of pedicle attached rhynchonellides, spiriferides, and terebratulides (low to high efficiency); BPA, biovolume of pedicle attached/free living orthotetides, orthides, spiriferides, spiriferinides (low to high efficiency).

Fig. 6 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 6. Pie diagrams showing composition of the Brigantian (uppermost Visean) Ricklow Quarry mud mound complex brachiopod fauna. A. Species percentage distribution of the various brachiopod orders for unit FA1 (A1), FA2 (A2). B. Specimen percentage distribution of the various brachiopod orders for unit FA1 (B1), FA2 (B2). C. Specimen percentage distribution of the various families of the order Productida for unit FA1 (C1), FA2 (C2).

Fig. 4 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 4. Outcrop photographs from the Ricklow Quarry site, Monyash, England. A. Eyam Limestone Formation beds onlapping (solid line arrows) the mud mound complex capping surface (dotted line). The boundary is marked by subaerial exposure features. B. Nodular packstone beds (Nb) and tabular massive mounds (Tm) forming the basal facies association (FA1) of the mound complex. C. Lens-shape mounds accreting to form the mound complex core (FA2). Dotted lines indicate capping surface of mounds. D. Detail of inclined flank beds (FA3) dipping eastward (inclination 35–25°) on the south-eastern edge of the mound complex. E. A ventral valve of Latibrachythyris cf. crassa (De Koninck, 1843) (below) and reticulate productide in life position (above) in a nodular packstone bed from the basal FA1 unit of the mound complex. F. Dorsal valve of a species of Antiquatonia from the mud mound complex core (FA2). The valve is part of a specimen in life position. The specimen is surrounded by other brachiopod shells and crinoid ossicles.

Fig. 1. A in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 1. A. Geographic position of the Derbyshire Carbonate Platform (DCP) within Great Britain. B. Geological map of the Peak District area and location of Ricklow Quarry near Monyash and Wensley Dale. Modified after Aitkenhead et al. (2002).

Fig. 14 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 14. Rhynchonellida and Spiriferida from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash (localities RCC-, RCK-; Fig. 3) and Wensley Dale, near Matlock (locality WI1; Fig. 2), Derbyshire, UK. A–G. Pleuropugnoides pleurodon (Phillips, 1836). A. MPUM12011 (RCC49-22) in dorsal (A1) and anterior (A2) views. B. MPUM12013 (RCK15-4) in ventral (B1) and dorsal (B2) views. C. MPUM12017 (RCK15B-3) in ventral (C1), dorsal (C2), and anterior (C3) views. D. MPUM12015 (RCK15-19) in ventral (D1) and dorsal (D2) view. E. MPUM12014 (RCK15-15) in lateral (E1), ventral (E2), and posterior (E3) views. F. MPUM12012 (RCC73-9) in lateral (F1), ventral (F2), posterior (F3), and anterior (F4) views. G. MPUM12016 RCK15-29) in ventral (G1), dorsal (G2), and anterior (G3) views. H–L. Propriopugnus pugnus (Martin, 1809). H. MPUM12021 (RCC2-55) in dorsal view.. MPUM12022 (RCC3-7) in dorsal (I1) and anterior (I2) views. J. MPUM12024 (RCC73-22b) in ventral (J1) and anterior (J2) views. K. MPUM12026 RCC60-4d) dorsal valve in dorsal view. L. MPUM12028 (WI1-33) in dorsal view. M.?Fusella sp., MPUM12037 (RCC128-5) ventral valve in ventral view. N, O. Martiniinae gen. et sp. indet. N. MPUM12065 (RCC2-58a) ventral valve in ventral view. O. MPUM12066 (WI1-32) ventral valve in ventral view. P–S. Angiospirifer bisulcatus (Sowerby, 1825). P. MPUM12032 (WI1-12a) in ventral view. Q. MPUM12035 (WI1-11) ventral valve in ventral view. R. MPUM12031 (WI1-10) in lateral (R1), dorsal (R2), ventral (R3), anterior (R4), and posterior (R5) views. S. MPUM12033 (WI1-30) in lateral (S1), dorsal S2), ventral (S3), anterior (S4), and posterior (S5) views. T–V. Latibrachythyris cf. crassa (De Koninck, 1843). T. MPUM12039 (RCC1-34a) ventral valve in ventral view. U. MPUM12038 (RCC1-21) ventral valve in ventral view. V. MPUM12041 (RCC54-17a) ventral valve in ventral (V1) and posterior (V2) views. Scale bars 10 mm.

Fig. 13 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 13. Echinoconchidae, Linoproductidae, Monticuliferidae, Orthotetida, and Orthida from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash, Derbyshire, UK (localities RCC-, RCK-; see Fig. 3). A. Echinoconchus punctatus (Sowerby, 1822), MPUM11976 (RCK15-47) in ventral view. B–D. Pustula cf. pustulosa (Phillips, 1836), B. MPUM11989 (RCC128-17a) dorsal valve external cast. C. MPUM11987 (RCC41-1) in ventral view. D. MPUM11988 (RCC128-7) in ventral (D1) and dorsal (D2) views. E, F. Linoprotonia sp. E. MPUM11991 (RCC42-17) in ventral (E1) and lateral E2) views. F. MPUM11992 (RCC60-59) in ventral view. G. Fluctuaria undata (Defrance, 1826), MPUM11926 (RCC300-14) ventral valve in ventral view. H.?Serratocrista aff. dalriensis McIntosh, 1974, MPUM11997 (RCC10-40) ventral valve in ventral view. I. Schellwienella sp., MPUM11995 RCC36-12) ventral valve in ventral view. J, K. Schizophoria (Schizophoria) cf. connivens (Phillips, 1836). J. MPUM12009 (RCC60-48) in ventral view. K. MPUM12010 (RCC1B-7) dorsal valve in dorsal view. L–O. Schizophoria (Schizophoria.) resupinata (Martin, 1809). L. MPUM12003 (RCC1B-4) dorsal valve in dorsal view. M. MPUM11999 (RCC1B-26) in dorsal view. N. MPUM12004 (RCC1B-25) dorsal valve in dorsal view. O. MPUM12005 RCC36-1a) dorsal valve in dorsal view. Scale bars 10 mm.

Fig. 2 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 2. Study area of Ricklow Quarry (Derbyshire, UK). A. Geological map of the surroundings of the village of Monyash and location of the site of Ricklow Quarry. Modified after British Geological Survey (1978). B. Stratigraphical column of the upper part of the Derbyshire Carbonate Platform succession in the study area around Monyash.

Fig. 9 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 9. Productellidae and Productidae from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash, Derbyshire, UK (localities RCC-, RCK-; see Fig. 3). A–E. Krotovia spinulosa (Sowerby, 1814). A. MPUM11886 (RCC73-22a) in ventral view. B. MPUM11889 (RCC3-18) dorsal valve interior and external cast. C. MPUM11891 (RCK15-16) interior and external cast. D. MPUM11892 (RCK15-28) dorsal valve interior and external cast. E. MPUM11887 (RCK15-10) in ventral view. F–K. Breileenia radiata Brunton in Brunton and Lazarev, 1997. F. MPUM11895 (RCC65-1) in anterior (F1), ventral (F2), and lateral (F3) views. G. MPUM11898 (RCC12-1) dorsal valve external cast. H. MPUM11899 (RCC12-7) dorsal valve interior and external cast. I. MPUM11900 (RCC12-15) dorsal valve external cast. J. MPUM11903 (RCC38A-2) fragment in anterior view. K. MPUM11901 (RCC12-23b) dorsal valve external cast. L. Geniculifera keyserlingiana (De Koninck, 1843), MPUM11905 (RCC73-28) in antero-ventral (L1), lateral (L2), and dorsal (L3) views. M. Limbifera sp., MPUM11890 (RCC54-10b), ventral valve in ventral view. N. Carringtonia cf. carringtoniana (Davidson, 1862a), MPUM11906 (RCC2-51) dorsal valve interior and external cast. O. Productus sp., MPUM11908 (RCC1-61b) in ventral view. P. Productus sp., MPUM11909 (RCC60-6) dorsal valve external cast.

Fig. 16 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 16. Spiriferida and Spiriferinida from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash (localities RCC-, RCK-; Fig. 3) and Wensley Dale, near Matlock (locality WI1; Fig. 2), Derbyshire, UK. A. Latibrachythyris cf. crassa (De Koninck, 1843), MPUM12040 (RCC54- 10a) ventral valve in ventral (A1) and lateral (A2) views. B–D. Latibrachythyris rotundata (Sowerby, 1825). B. MPUM12047 (RCC65G-12) dorsal valve in dorsal view. C. MPUM12043 (RCK15-1a) in ventral view. D. MPUM12045 (RCK15-40) ventral valve in ventral (D1) and lateral (D2) views. E, F. Brachythyrididae gen. et sp. indet. E. MPUM12049 (RCC11-8) ventral valve in ventral view. F. MPUM12052 (RCC42-5a) dorsal valve in dorsal view. G. Reticularia cf. mesoloba (Phillips, 1836), MPUM12053 (RCK15-43) in ventral (G1) and dorsal (G2) views. H. Georgethyris lobata (MuirWood, 1926), MPUM12086 (WI1-9) in ventral (H1), dorsal (H2), anterior (H3) and lateral (H4) views. I–K. Phricodothyris paricosta George, 1932.. MPUM12058 (RCK15-34a) dorsal valve (I1) and MPUM12055 (RCK15-34b) ventral valve (I2). J. MPUM12057 (RCK15-9) dorsal valve in dorsal view. K. MPUM12054 (RCC40-10a) ventral valve in ventral view. L–N. Phricodothyris cf. periculosa George, 1932. L. MPUM12061 (RCK15-3) in dorsal (L1) and lateral (L2) views. M. MPUM12060 (RCC73-30a) in ventral (M1) and lateral (M2) views. N. MPUM12064 (RCC2-37) ventral valve in ventral view. O. Phricodothyris sp., MPUM12071 (RCC60-4a) ventral valve in ventral view. P. Nebenothyris sp., MPUM12073 (WI1-26a) ventral valve in ventral view. Q.?Punctospirifer sp., MPUM12074 (RCC73-23c) ventral valve in ventral view. Scale bars 10 mm.

Fig. 10 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 10. Productidae from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash (localities RCC-, RCK-; see Fig. 3) and Wensley Dale, near Matlock (locality WI1; see Fig. 2), Derbyshire, UK. A. Productus cf. productus (Martin, 1809), MPUM11919 (RCC41-3a) in ventral view. B–E. Eomarginifera cf. laqueata (Muir-Wood, 1928). B. MPUM11910 (RCC32-26) in ventral (B1), lateral (B2), and anterior (B3) views. C. MPUM11911 WI1-41) in ventral (C1) and anterior (C2) views. D. MPUM11914 (RCC60-35) dorsal valve interior and external cast. E. MPUM11915 (RCC300-13) dorsal valve external cast. F–L. Antiquatonia hindi (Muir-Wood, 1928). F. MPUM11917 (RCC13-2) in ventral view. G. MPUM11918 (RCC50-1) in anterior view. H. MPUM11920 (RCC123-1) in ventral view. I. MPUM11921 (RCK15-7) in ventral view. J. MPUM11925 (RCC32-6) ventral valve in anterior view. K. MPUM11922 (WI1-19) in ventral (K1), lateral (K2), dorsal (K3), and posterior (K4) views. L. MPUM11923 (WI1-25) in ventral view. M–Q. Antiquatonia aff. hindi (Muir-Wood, 1928). M. MPUM11930 (RCC12-8) in ventral (M1) and posterior (M2) views. N. MPUM11934 (RCC39-19) ventral valve in ventral view. O. MPUM11935 (RCC2-8) dorsal valve external cast. P. MPUM11931 (RCC13-3a) in posterior (P1) and ventral (P2) views. Q. MPUM11932 (RCC32-19) in anterior (Q1) and lateral (Q2) views. Scale bars 10 mm.

Fig. 17 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 17. Terebratulida from the Brigantian (uppermost Visean) of Ricklow Quarry, near Monyash, Derbyshire, UK (localities RCC-, RCK-; Fig. 3). A–K. Harttella oakleyi Brunton, 1982. A. MPUM12075 (RCC10-15b) in ventral view. B. MPUM12076 (RCC41-9) in dorsal (B1), ventral (B2), and anterior (B3) views. C. MPUM12077 (RCC41-22) in dorsal (C1), ventral (C2), lateral (C3), and anterior (C4) views. D. MPUM12078 (RCC49-9) in dorsal (D1), ventral (D2), lateral (D3), and anterior (D4) views. E. MPUM12080 (RCC60-19b) in dorsal (E1) and ventral (E2) views. F. MPUM12079 (RCC49-12) in dorsal (F1), and ventral (F2) views. G. MPUM12081 (RCC65G-2) in dorsal (G1) and ventral (G2) views. H. MPUM12082 (RCC65G-8a)) in dorsal (H1), ventral (H2), lateral (H3), and anterior (H4) views. I. MPUM12083 (RCC65G-11) in dorsal (I1) and ventral (I2) views. J. MPUM12084 (RCC65G-14) in dorsal (J1) and ventral (J2) views. K. MPUM12085 (RCK15-14) in dorsal (K1) and ventral (K2) views. L–O.?Balanoconcha sp. L. MPUM12094 (RCC10- 15a) in lateral view. M. MPUM12095 (RCC300-1) in ventral view. N. MPUM12097 (RCK15-26) in dorsal view. O. MPUM12096 (RCK15-18) in lateral (O1), dorsal (O2), and ventral (O3) views. P. Beecheria sp., MPUM12092 (RCC49-31) in dorsal (P1), ventral (P2), lateral (P3), and anterior (P4) views.

Fig. 5 in Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK

Fig. 5. Photomicrographs of petrographic thin sections from the Brigantian (uppermost Visean) mud mound complex of Ricklow Quarry (FA1, FA2, FA3), Monyash, England. A. Sample MPUM12295 (RCC89). Automicrite boundstone patch (Amb) within a packstone (Pck) with allomicrite, from a nodular packstone bed at the base of the mound complex (FA1). Note more heavily recrystallized allomicrite with respect to automicrite. Plane polarisers. B. Sample MPUM12295 (RCC5). Articulated brachiopod shells embedded in automicrite from a tabular mound from the basal unit of the mound complex (FA1). Plane polarisers. C. Sample MPUM12295 (RCC65). Automicrite‒fenestellid bryozoan boundstone with abundant radiaxial fibrous marine and equant burial calcite cements from the mound complex core (FA2). Fenestellid frond marked by dotted line. Plane polarisers. D. Sample MPUM12295 (RCC85). Articulated brachiopod shells, crinoid ossicles (Cr), and fenestellid bryozoan fronds (Br) in automicrite boundstone from the mound complex core (FA2). The biconvex brachiopod specimen is in life position and lived attached to the crinoid ossicle in the mud underneath its umbo. Plane polarisers. E. Sample MPUM12295 (RCC32B). Productide spine (Ps) and calcite-replaced siliceous sponge spicules (Ss) in automicrite boundstone from the mound complex core (FA2). Plane polarisers. F. Sample MPUM12295 (R6). Isoriented skeletal packstone with brachiopods and crinoids, with allo- and automicrite from the flank beds (FA3). Convex-up disarticulated brachiopod shells aligned along the flank beds forming shelter porosity, later filled by equant calcite cement. Plane polarisers.

Fig. 14. A in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 14. A. Hypothesized morphogenetic pathway for derivation of the bivalved stenothecoid scleritome from a multisclerite, tubular, organocalcitic, eccentrothecimorph ancestor via a hypothetical organocalcitic tannuolinid. Eccentrothecimorph slightly modified from Skovsted et al. (2011: text-fig. 17). Tannuolinid modified from Skovsted et al. (2014). B. A possible cladogram that assumes an organocalcitic scleritome is primitive for the Pan-Brachiopoda. In this view, organophosphatic mineralogy evolved independently several times and the Stenothecoida evolved a bivalved scleritome independently of the Brachiopoda + Micrina clade.

Fig. 7 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 7. SEM micrographs of stenothecoid pan-brachiopod Stenothecoides cf. elongata, middle Cambrian, Burgess Shale Formation, Kootenay National Park, Canada, Locality 3. A. ROMIP 66248, articulated shell in right lateral view. B. ROMIP 66249, articulated shell in left lateral (B1) and posterior (B2)

Fig. 5 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 5. Stenothecoid pan-brachiopod Stenothecoides rasettii sp. nov., middle Cambrian, Burgess Shale Formation, Yoho National Park, Canada, Locality 2 (A, G) and Locality 1 (B–F, H–J). A. TMP 2002.083.0178, dorsal valve in interior (A1), exterior (A2), right lateral (A3), and posterior (A4) views. B. TMP 2008.024.1138, ventral valve in interior view. C. TMP 2008.024.1133, dorsal valve in interior view, arrows show possible bifurcated peripheral ridges. D. TMP 2008.024.1143, dorsal valve in interior (D1) and anterior oblique (D2) views. E. TMP 2008.024.1144, dorsal valve in interior (E1) and anterior (E2) views. F. TMP 2008.024.1134, ventral valve, interior view. G. TMP 2002.083.0177 (same specimen as Fig. 4B), ventral valve in interior (G1, magnified) and oblique (G2) views. H. TMP 2008.024.1135, dorsal valve in interior view. I. TMP 2008.024.1121, ventral valve, anterior view. J. TMP 2008.024.1136, ventral valve in interior view, showing detached apical boss and remnant apical stem and cardinal troughs.

Fig. 4 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 4. Stenothecoid pan-brachiopod Stenothecoides rasettii sp. nov., middle Cambrian, Burgess Shale Formation, Yoho National Park, Canada, Locality 2 A, B, D) and Locality 1 (C, D). A. TMP 2002.083.0176 (holotype), dorsal valve in exterior (A1) and interior (A2) views. B. TMP 2002.083.0177, ventral valve in exterior view. C. TMP 2008.024.1147, dorsal valve, internal apical area. D. TMP 2008.024.1122, articulated juvenile, dorsal/ventral (uncertain) valve in posterior (D1), lateral (D2), and oblique planar (D3) views; D1 and D3 show posterior median opening, D2 shows slightly sinusoidal commissure.

Fig. 3 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 3. Orientation, measurements, and ridge zones in Stenothecoides rasettii sp. nov. A. Ventral valve, exterior, showing orientation for measurements. B. Ventral valve, interior, showing peripheral and axial ridge zones, and approximated body cavity. Abbreviations: ax, auricular axis; az, axial ridge zone; bc, body cavity; L, valve length; ll, left lobe; lx, lobe axis; pz, peripheral ridge zone; rl, right lobe; vx, valve axis; W, valve width.

Fig. 2 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 2. Stratigraphic and geographic distribution of sample localities. A. Stratigraphic position of localities 1–3 indicated with stars. Thicknesses of units at Fossil Ridge/Mount Field from Fletcher and Collins (1998) and Mount Stephen northwest shoulder from Christopher J. Collom and PAJ (unpublished data); stratigraphic units after Collom et al. (2009), Odaray Mountain section from Streng et al. (2016). Helcionellid icons show known silicified assemblages. B. Geographic distribution of localities 1–3 relative to the Cathedral escarpment. C. Known stratigraphic distribution of stenothecoids in British Columbia, Utah, and Nevada. Stratigraphy modified from Johnston et al. (2009a). D. General location of study area in western Canada. Abbreviations: CC, Campsite Cliff Shale Member; Fm., Formation; KH, Kicking Horse Shale Member; Loc, Locality; MF, Monarch Formation; Mt., Mount or Mountain; S., Stenothecoides; WA, Wapta Member; WL, Wash Limestone Member; WQ, Walcott Quarry Shale Member; YR, Yoho River Limestone Member.

Fig. 9 in Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides-new data from the middle Cambrian Burgess Shale Formation

Fig. 9. Bivariate plots of length and width and best fit lines of Stenothecoides rasettii sp. nov., Burgess Shale Formation, Locality 2 (tectonic strain is evident in some specimens at Locality 1, which are excluded from this plot); Stenothecoides elongata (Walcott, 1884), Wheeler Formation, Drum Mountains, Utah, USA, Locality 8 of Robison (1964); Stenothecoides cf. elongata, Burgess Shale Formation, Locality 3; Stenothecoides cf. elongata, Mount Whyte Formation, Ross Lake, Mount Stephen, and Mount Field, Yoho National Park, Canada (Rasetti 1954, 1957).