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Fig. 5 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 5. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs. Graptolite pattern of 2 tube ultrastructure. A. Broken tube wall showing layered ectocortex and fusellar layer. B. Parallel bundles of cortical fibrils covering the fusellar layer. C. Fuselli arrangement; note the oblique suture. D. Details of fusellar fabric. Abbreviations: b, bundle of cortical fibrils; cf, cortical fibril; ec, ectocortical layer; f, fusellar layer; o, oblique fusellar suture; p, pits.

Fig. 2 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 2. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs of chemically 2 isolated fragments. A. Fragment of a single tube with a fragment of apertural margin. B, C. Broken bundles of tubes. Abbreviations: a, apertural margin; f, interfusellar suture; i, interior of the tube; p, periderm perforations; t1, t2, etc., adjacent tubes. Arrows show circular cross section of the tubes.

Fig. 8 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 8. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs. A–C. Inner periderm 2 surface where removal of the enamel−like inner lining reveals cortical fibrils of endocortex beneath. D. Enlargement of cortical fabric in endocortex. Abbreviations: b1, b2, b3, adjacent bundles of cortical fibrils; c, cortical fibril; d, mineral debris; en, endocortex; i, inner lining; t, transverse connecting fibril.

Fig. 7 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 7. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs. Details of 2 cortical fabric in ectocortex. A. Bundles of cortical fibrils. B. Arrangement of cortical fibrils in bundles. Abbraviations: b, bundle of fibrils, f, cortical fibril.

Fig. 3 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 3. Melanostrophus fokini Öpik, 1930; Ordovician boulder O.148 (Wyszogród/Zakroczym, Poland); ZPAL Pb 6/1. SEM micrographs of a fragment of colony composed of numerous fused zooidal tubes. A. General view. B. Margin of the specimen showing transversely broken and strongly flattened tubes. C, D. Large openings in the tube wall. Abbreviatons: i, interior of tube; o, large opening in the wall; w, wall of zooidal tube.

Fig. 9 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 9. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrograph showing differ2 ent types of periderm perforation. Abbreviations: l, large opening, m, medium opening, s, small opening.

Fig. 1 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 1. Melanostrophus fokini Öpik, 1930. Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia). Fragment of the specimen, preserved in the limestone 2 matrix; ZPAL Pb 6/1. SEM micrographs. A. Fragment of a middle part of the colony made of rather closely packed tubes. B, C. Lateral offshoots of the tubes. D. Tubes connected with the anastomosis. E. Part of a distal portion of the colony made of loosely arranged tubes. F. Bifurcation of the tube. Abbreviations: a, anastomosis; b, bundle of tubes; m, matrix; o, lateral offshoot of the tube; t, tube. Arrows in B indicate fusellar sutures or their impressions.

Fig. 6 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 6. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs. A–C. De2 tails of ectocortex. Abbreviations: b, bundle of cortical fibrils; cf, cortical fibril; h, homogenous material within the cortical tissue.

Fig. 4 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 4. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β Ubja); ZPAL Pb 6/1. TEM micrographs. A, B. Transverse sec2 tions of the tube wall showing homogenous and fibrillar ultratructure. Abbreviations: f, fibril; h, homogenous material.