Fig. 2 in Autothecal morphs and dormancy in the camaroid graptolite Xenotheka

Fig. 2. Sealing of the thecal aperture (occlusion) in some sessile graptolites. SEM micrographs. A. Xenotheka klinostoma Eisenack, 1937; ZPAL G.12/4, Llandeilo, borehole Krzyże 4 (Poland), depth 473 m. Distal part of autotheca. B. Camaroid gen. et sp. nov. 1; ZPAL G.31/4, Ordovician erratic boulder, northern Poland. Distal part of autotheca. C. Epigraptus kozlowskii Mierzejewski, 1978 (Tuboidea); ZPAL G.31/3, Lower Ordovician (Kunda Stage, Aluoja Substage), Sukhrumägi in Tallinn, Estonia. Bitheca on the thecorhiza surface. Explanations: c, camara; co, collum; o, occlusion; p, apertural process; t, thecorhiza, v, verruca of verrucose fabric. Arrow shows discontinuity between autothecal wall and occlusion.