Fig. 5 in Devonian pearls and ammonoid-endoparasite co-evolution

Fig. 5. "Housean pits" type 3. Sobolewia nuciformis (Whidborne, 1889), three specimens kept under the same number (MNHN−R.08459), Givetian, Redjel Iamrad, Algeria, Jacques Follot collection. A. A heavily weathered specimen in which the erosion was most intense around the pits; lateral (A1) and (A2) dorsal views, weathered specimen, where the shell broke at the pits and weathering intensified in those radii. B. Lateral view of a specimen showing only two pits, additional pits probably covered by shell. C. The best preserved specimen, previously published in Korn and Klug (2002: fig. 52B), in ventral (C1) and lateral (C2) views, well preserved specimen, where the shell broke off only at the four lateral pits, showing the tube cross section in the pits (the globular structures in the centre of the pit at the bottom and on the left are artefactsfrom the production of the cast). Images taken from epoxy casts. All specimens coated with NH4Cl.