Bennett—Rhamphorhynchus wings
857
Figure 7. Close-up photograph of the dorsal skin impression of the left dactylopatagium of the Marsh specimen of Rhamphorhynchus muensteri, YPM 1778. (1) Striae in the posteromedial part of the impression with the trailing edge at bottom, undulations near the trailing edge, and six small gouges that resulted from removal of the counterpart; (2) the largest depression in the skin impression that distorts and obliterates the pattern of striae. Scale bars represent 5 and 3mm, respectively.
Figure 8. Marsh specimen of Rhamphorhynchus muensteri, YPM 1778. (1) Close-up photograph of the small section of soft tissue traces of folded patagium lying on top of the main impression behind wing phalanx 1 that preserves positive impressions of actinofibrils; (2) interpretive drawing with the retrophalangeal wedge shaded dark gray, surface epidermis of the folded patagium shaded medium gray, striae indicated by thin black lines, lateral part preserving actinofibrils darkly hatched with spacing and angle of hatching approximating the size and orientation of the actinofibrils, and gouges into the matrix stippled. Note the irregular fibrous appearance of the retrophalangeal wedge in the upper right. Scale bar represents 3mm.
trace is truncated by a fracture such that the wedge tissues may have continued farther laterally. There is a distinct groove along the arcing posterior margin of the wedge trace that sets it off from the pattern of striae posterior to it. That part of the trace lateral to the midpoint of WP1 exhibits loose sinuous fibers similar to those of the Zittel wing’s retrophalangeal wedge trace, whereas the more posteromedial parts exhibit a combination of loose sinuous fibers and posterolaterally oriented lineations that seem to be a continuation of the pattern of striae posterior to the wedge trace. The right wing does not preserve a clear trace of the
wedge, but immediately behind WP2 and the proximal third of WP3 there is a narrow fillet of matrix with a fractured surface that may represent part of the retrophalangeal wedge. Whatever it is, the fillet provides no information about structure of the retrophalangeal wedge.
Discussion
The Zittel wing and Marsh specimen support Wellnhofer’s (1975) observation that the wings of Rhamphorhynchus were
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