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. 2018 Jun 27;14(6):20180270. doi: 10.1098/rsbl.2018.0270

Figure 1.

Figure 1.

(a–g) Lampris sp. (MNHN-ZA-AC-A-7506). Sections of the rib (natural transmitted light). (a) Entire cross section showing numerous vascular cavities (asterisks). (b) Longitudinal section showing numerous osteocyte lacunae. (c) Detail of inset 1 in (a), showing osteocyte lacunae (arrows) in primary bone. (d) Detail of inset 2 showing an area of primary bone with circularly-oriented osteocytes, and vascular cavities fringed by secondary bone. (e) Detail of an osteocyte (arrow) in primary bone with its radially-oriented canaliculi. (f) Longitudinal section showing osteocytes in primary bone. An osteocyte lacuna is seen in secondary bone (arrow). (g) Detail of inset 3 showing remodelled secondary bone including osteocytes without canaliculi (arrow). (h) Velifer hypselopterus (MNHN-ICOS-01117). Cross section of the scapula (transmitted natural light) showing the lack of osteocytes, but the presence of bifurcated (arrows) osteoblastic canaliculi inside the primary bony tissues. Some areas of secondary bone are visible. pb, primary bone; sb, secondary bone; vc, vascular cavity; *, marrow cavity. Arrowheads point to reversal lines between primary and secondary bone. Scale bars, (a) 500 µm, (b–d,g) 100 µm, (e–f,h) 50 µm.