Cubiculum

Hedeny, Magdy El, Mohesn, Sara, Tantawy, Abdel-aziz, El-Sabbagh, Ahmed, AbdelGawad, Mohamed & El-Kheir, Gebely Abu, 2023, Bioerosion traces on the Campanian turtle remains: New data from the lagoonal deposits of the Quseir Formation, Kharga Oasis, Egypt, Palaeontologia Electronica (a 40) 26 (3), pp. 1-21 : 8

Cubiculum isp.

( Figures 3G , 4F )

Material. Many boring clusters on five carapace remains (NVP0013‒017).

Discussion. The present specimens are closely allied to Cubiculum isp. This is especially true for the general outline, dimension, and arrangement of borings. Borings are arranged in groups of three to five and parallel to each other, according to its major axis. However, due to sediment infilling and poor preservation, they could not be determined at the ichnospecific level.

Ichnogenus Osteocallis Roberts et al., 2007

Type ichnospecies. Osteocallis mandibulus Roberts et al., 2007

Diagnosis. Shallow, meandering trail of arcuate grooves (apparently paired) bored into external (cortical) bone surfaces. May be single trail or network of randomly overlapping trails ( Roberts et al., 2007).

Figures

FIGURE 3. (A) Nihilichnus nihilicus, circular, subcircular to ellipsoidal non-penetrating holes (arrows) on the carapace peripheral. (B, C) Karethraichnus lakkos. (B) Cluster of bowl-shaped pits (arrows) of on the carapace peripheral. (C) Small rounded holes (arrows) of which are not completely penetrating the plastron fragments. (D) External surface of carapace peripheral containing three ichnospecies Cubiculum ornatus, C. inornatus and Osteocallis mandibulus (E, F, and H, respectively). (E) Cubiculum ornatus (arrows), showing the characteristic features of the ichnospecies with well pronounced bioglyphs. (F) Cubiculum inornatus (arrow), showing details of the morphological features the ichnospecies. (G) Cubiculum isp., showing borings arranged in groups of mostly parallel to each other and infilled with sediments. (H) Osteocallis mandibulus (ellipse), showing, randomly oriented surface borings with distinct arcuate (commonly paired) scratches in turtle skeleton. Scale bars equal 0.5 cm, except for B, D and G, which are 1.0 cm, and for C, which is 0.4 cm.

FIGURE 4. (A, B) Osteocallis mandibulus. (A) Small randomly oriented surface borings. (B) Close up view of A, showing small randomly oriented surface borings. (C, D) Radulichnus inopinatus, parallel to sub-parallel arcuate bundles closely spaced in groups. (E) Osteichnus ossiobontum, parallel borings with fused U-notches, inclined to the bone surface. (F) Osedacoides jurassicus, small simple borings in bone (yellow arrows) penetrating into the turtle bone. Note the occurrence of some Cubiculum isp. traces (red arrows). (G) Sulculites bellus, smooth, slender narrow, nonbranched straight to curved grooves. (H) Machichnus?bohemicus, shallow serial parallel or subparallel grooves (arrows) in carapace peripheral. Scale bars equal 1.0 cm, except for B, D, and E, which are 0.5 cm.