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. 2018 Sep 26;5(9):181295. doi: 10.1098/rsos.181295

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Diagram of linear measurements taken on aepyornithid leg bones. (a) Femoral measurements. F1: total length; F2: minimum midshaft width; F3: circumference at minimum midshaft width; F4: maximum midshaft width; F5: circumference of caput femoris; F6: dorsoventral diameter of caput femoris; F7: proximo-distal diameter of caput femoris; F8: dorsoventral thickness of trochanter femoris; F9: maximum width of distal condyles; F10: maximum height of condylus medialis; F11: maximum height of condylus lateralis; F12: sulcus patellaris to trochanter femoris; F13: trochanter femoris to condylus medialis; F14: proximo-medial extreme of caput femoris to condylus lateralis; F16: medio-lateral length of caput femoris; F17: dorsal extremity of crista trochanteris to dorsal extremity of caput femoris; F18: ventral extremity of crista trochanteris to ventral extremity of caput femoris; F19: trochlea fibularis width; F20: distance between medial and condylus lateralis. (b) Tibiotarsal measurements. Tt1: total length; Tt2: minimum midshaft width; Tt3: circumference at Tt2; Tt4: maximum midshaft width; Tt5: width of condyles; Tt6: maximum height, condylus medialis; Tt7: maximum height, condylus lateralis; Tt8: maximum width of head, including crest; Tt9: width of proximal end, including crista cnemialis cranialis; Tt10: width of head; Tt11: distance between cnemial crests; Tt12: extreme width of posterior groove; Tt13: posterior groove to external condyle; Tt14: posterior groove height to external condyle; Tt15: external condyle width; Tt16: external condyle height; Tt17: outer cnemial crest width; Tt18: outer crista cnemialis lateralis height; Tt19: total outer crista cnemialis lateralis ridge length; Tt20: tibia scar. (c) Tarsometatarsal measurements. Tmt1: length; Tmt2: minimum shaft thickness (not midshaft); Tmt3: shaft width at Tmt2; Tmt4: trochlea III width; Tmt5: width (all trochleae); Tmt6: head height at midpoint, including ridge; Tmt7: maximum height, proximal end of metatarsal II; Tmt8: maximum height, proximal end of metatarsal IV; Tmt9: head width; Tmt10: inside curve (plantar) across three trochleae; Tmt11: outside curve (cranial) across three trochleae; Tmt12: trochlea III, plantar width; Tmt13: trochlea III, cranial width; Tmt14: trochlea II, medial thickness; Tmt15: trochlea II, central thickness; Tmt16: trochlea II, lateral thickness; Tmt17: trochleae III, medial thickness; Tmt18: trochlea III, central thickness; Tmt19: trochleae III, lateral thickness; Tmt20: trochlea IV, medial thickness; Tmt21: trochlea IV, central thickness; Tmt22: trochlea IV, lateral thickness; Tmt23: trochlea III, diagonal length; Tmt24: trochlea IV, diagonal length; Tmt25: trochlea III, medial length, outside to notch; Tmt26: trochlea III, medial length, outside with notch; Tmt27: trochlea III, medio-cranial length; Tmt28: trochlea III, lateral-cranial length; Tmt29: trochlea III, lateral length, outside; Tmt30: trochlea II length; Tmt31: trochlea IV length; Tmt32: trochlea III, cranial (peak to peak) notch width; Tmt33: total width at foramina; Tmt34: foramina width; Tmt35: maximum anterior–posterior depth of external cotyle; Tmt36: minimum depth of head; Tmt37: maximum depth at hypotarsal ridge (no ridge); Tmt38: maximum depth at hypotarsal ridge (inclusive of ridge); Tmt39: proximal–lateral extreme of head to hypotarsal ridge extreme; Tmt40: proximal–medial extreme of head to hypotarsal ridge extreme; Tmt41: length, trochlea II to head; Tmt42: length, trochlea IV to head; Tmt43: diagonal length, trochlea II to head; Tmt44: diagonal length, trochlea IV to head.