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. 2021 Mar 31;7(14):eabe7377. doi: 10.1126/sciadv.abe7377

Fig. 3. Articulation of the upper branch of O. serratus.

Fig. 3

(A and B) Ventral view of USNM 65519 (counterpart) showing upper branch connected directly with wrinkled arthrodial membrane and distinct from limb base. (C to E) Dorsal view of USNM 65519 (part) showing upper branch connected to wrinkled and convexly arched arthrodial membrane and separated from lower branch. (F and G) Upper branch connections with the arthrodial membrane and adjacent inner margin of the proximal lobe fringed with filaments extending posteriorly outward, USNM 188574. (H) GSC 34692b (part) showing a triangular body-limb junction, of which one side connected with the upper branch (marked by bracket). (I and J) Both branches articulated with arthrodial membrane, and upper branch clearly separated from lower branch, GSC 34695a (counterpart). (I) Light incident from right. Arrows highlight the boundary between upper branch and limb base. The dotted lines mark the arthrodial membrane outline. Anterior of fossil at top of all images. am, arthrodial membrane; am?, possible arthrodial membrane; gs, gnathobasic spine; dl, distal lobe of upper branch; fl, filament; lb., limb base; pl, proximal lobe; po1 to po3, podomeres 1 to 3, respectively; T3 to T5, thoracic segments 3 to 5, respectively. Scale bars, 5 mm (A to F and H to J) and 2 mm (G).