876


Journal of Paleontology 91(5):871–882


Figure 4. Cambroctoconus koori n. sp., Henson Gletscher Formation, North Greenland; Cambrian Series 3, Stage 5, Ptychagnostus gibbus Biozone unless stated. All specimens from GGU sample 271718 unless stated. (1–4) PMU 31712, internal mold viewed from base (broken away from substrate) showing eight principal septa preserved as canals and infilled pore canals; arrows a and b locate equivalent points in (1, 4) and (2, 3), respectively; (5, 6) PMU 31718, internal mold from GGU sample 315879 (Cambrian Series 2, Stage 4) showing eight-fold arrangement of primary septa as ridges on basal surface (5) and continuous ridges (arrowed) separated by areas with infilled pores on the lateral surfaces (6); (7) PMU 31713, lateral view of internal mold showing septal ridges and infilled pores; (8) PMU 31714, lateral view of internal mold showing septal grooves and infilled pores; (9) PMU 31715, lateral view of internal mold; (10) PMU 31716, oblique calical view showing radial channels on floor of calice; (11) PMU 31717, oblique calical view showing broad ridges and narrow channels on base of calice; arrow indicates introduction of new channel. Scale bars: 200 µm, except (3, 4) = 100 µm.


the interior of the corallum are impressed into the surface of the mold, with porous areas between. Infilled pores traverse the septa. Septa bifurcate at ~500 µm from the pointed base (Fig. 3.1, 3.5, arrows) and are equated with the thin perforated


septa visible in transverse thin-sections of C. orientalis (Park et al., 2011, fig. 2). In silicified specimens of the type species, the raised margins of the eight channels (arrows in Fig. 1.5) indicate the position of these thin perforated septa.


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