. Conodont ultrastructure : the family Panderodontidae. Conodonts; Panderodontidae. Fig. 2—Diagram of the internal structure of a belodinid, Belodina compressa; longi- tudinal section. Abbreviations in Fig. 1; about X 125. Fig 3 A-D—Panderodus gracilis, a multi-element species comprising the form species P. compressus (a,b, inner and outer lateral views) and P. gracilis (c,d, inner and outer lateral views). Specimens uncoated and unretouched to show extent of basal cavity and white matter in tip. Bobcaygeon Formation, Middle Ordovician, Great Cloche Island, Manitoulin, Ontario, x 80. E-G—Pande
. Conodont ultrastructure : the family Panderodontidae. Conodonts; Panderodontidae. Fig. 2—Diagram of the internal structure of a belodinid, Belodina compressa; longi- tudinal section. Abbreviations in Fig. 1; about X 125. Fig 3 A-D—Panderodus gracilis, a multi-element species comprising the form species P. compressus (a,b, inner and outer lateral views) and P. gracilis (c,d, inner and outer lateral views). Specimens uncoated and unretouched to show extent of basal cavity and white matter in tip. Bobcaygeon Formation, Middle Ordovician, Great Cloche Island, Manitoulin, Ontario, x 80. E-G—Panderodus arcuatus. Scanning electron (SEM) micrographs of a transverse section near midlength. e) general view. Note radial lamellae flanking longitudinal furrow, both penetrating inwards from inner lateral face; concentric lamellae in remainder of specimen, x 290. f) detail of radial lamellae at outer surface of inner lateral face that penetrate inwards. Small, needle-like crystallites aligned vertical to the plane of section, x 5,750. g) detail of concentric lamellae around anterior part of basal cavity. Note lateral changes in thickness of lamellae; crystallites linearly arranged parallel to the axis of the element; overlapping of lamellae on wall of basal cavity; wide interlamellar spaces immediately anterior to the basal cavity, x 1,175. H—Detail of striations (radial lamellae) and longitudinal furrow on inner lateral face of Panderodus gracilis. Note smooth zones on either side of furrow beyond which are parallel striations extending to anterior shoulder (right) and close to posterior margin (left). Disregard transverse fracture and secondary surface overgowth. Chaumont Formation, Middle Ordovician, Upper Ottawa Valley, Ontario, x575. 16. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Barnes, Chr
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