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Fig. 4 | Journal of Palaeogeography

Fig. 4

From: Ornamental feathers in Cretaceous Burmese amber: resolving the enigma of rachis-dominated feather structure

Fig. 4

RDFs with weakly interlocking barbs. a DIP-V-16202 overview; b cross-section of the barbs of DIP-V-16202, arrowheads indicate barbule origination points, arrow indicates barb origination on posterior margin of rachis; c DIP-V-16202 barb, with pigment banding in barbules; d DIP-V-16223 overview, arrow indicates bending point in rachis; e detail of rachis and rachidial ridge in DIP-V-16223; f base of rachis for DIP-V-17180 (overview in g), arrow indicates breach of rachis base on polished surface of amber piece; g DIP-V-17180 overview, arrow indicates basal constriction detailed in F, arrowheads mark asymmetrical bases of feather vanes; h DIP-V-17153 overview, arrowheads mark asymmetrical bases of feather vanes, arrow indicates exposed barbs featured in j; i detail of inwardly rolled rachis base on DIP-V-17153; j cross-section of barbs of DIP-V-17153 showing elongate distal barbules. Scale bars = 2 mm in (a, d, f and i); 0.5 mm in (b); 0.2 mm in (c and j); 1 mm in (f); 5 mm in (g and h)

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