Bulletins of American paleontology. Cambrian Trilobites, South Dakota 253. Text-figure 1. A growth series of Coosia albcrtensis Resser. A. Anapro- taspis, X 50; B, C. Two metaprotaspides, X 50, X 48;

Download this stock image: . Bulletins of American paleontology. Cambrian Trilobites, South Dakota 253. Text-figure 1. A growth series of Coosia albcrtensis Resser. A. Anapro- taspis, X 50; B, C. Two metaprotaspides, X 50, X 48; D, E. Small and large paraprotaspides, X 40, X 38; F. Small early meraspis, X 13; G. Large early meraspid cranidium, X 8; H. J. Two late meraspid cranidia, X 13, X 19; I. Immature librigena, X 6; K. Hypostoma, X 10; L, M. Small and large holaspid cranidia, X 2.4, X 1-7. (All drawings were made from photographs.). Please note that these images are extracted from scanned page images that may have - RG9GN2 from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

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Bulletins of American paleontology. Cambrian Trilobites, South Dakota 259 The metaprotaspid stage differs from the anaprotaspid in hav- ing the axial lobe well delimited by a dorsal furrow and the presence

Bulletins of American paleontology. Cambrian Trilobites, South Dakota 253. Text-figure 1. A growth series of Coosia albcrtensis Resser. A. Anapro- taspis, X 50; B, C. Two metaprotaspides, X 50, X 48;

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