Figure 1
From: A putatively extinct higher taxon of Spirotrichea (Ciliophora) from the Lower Cretaceous of Brazil
Morphology of Palaeohypothrix bahiensis gen. et sp. nov. (a) Photograph of holotype (ufrjdg762pb0d0019.png in Supplementary Data 1) showing remains of the nuclear apparatus. (b) Composition assembled from parts of volumetric reconstruction sections where the external amber layer could be virtually removed from the ventral side, showing presumed remains of ciliature elements and contractile vacuole. The dot shows darkened area where part of the anterior macronuclear nodule is seen by transparency; asterisks mark short ciliary brushes right of left marginal ciliature and arrowheads show spots with undetermined surface structures. c. Volumetric reconstruction of dorsal side with external amber layer removed, showing dorsal ribs (asterisks) and attachment sites of crown membranelles (arrowheads). (d,e) Interpretative reconstruction of live specimen depicting the ventral side; structures marked in (e). Legends: AZM adoral zone of membranelles, CV contractile vacuole, F frontal ciliary structures, FV fronto-ventral ciliary structures, LM left marginal ciliature, Ma macronuclear nodule, Mi micronucleus, P paroral membrane, RB vestige of macronuclear DNA replication band, RM right marginal ciliature, TC transverse cirri-like structures. Scale bars = 20 µm.
