Fig. 18. Mesosaurus tenuidens Gervais, 1865 in Isometry in mesosaurs: Implications for growth patterns in early amniotes

Fig. 18. Mesosaurus tenuidens Gervais, 1865, metatarsal and phalanx measurements. A–E. Metatarsal and phalanx lengths measured in each 1st–5th toe. Black dashed line represents the empirical curves pn = mt/(n+1) and red dotted lines represent the empirical curve pn = mt/[(n+1)*1.2] for the largest and smallest measured toe, where mt is the length of the metatarsal and pn is the length of the n-th phalanx. F. Lengths are normalized by the metatarsal length for all the measured toes. Black line shows the mean normalized length, black dash-dotted lines represent the 2σ interval. Red dotted line represents the empirical curve pn = mt/[(n+1)*1.2]. The number of individuals measured (N) is indicated in the upper corner of each graph. Abbreviations: mt, metatarsals; p1–p5, phalanges.图18 细齿中龙（*Mesosaurus tenuidens* Gervais, 1865）跖骨与指骨测量数据。A~E：依次测量第1至5趾的跖骨及指骨长度。黑色虚线代表经验曲线$p_n = m_t/(n+1)$，红色虚线则对应针对最大和最小被测趾的经验曲线$p_n = m_t/[(n+1)×1.2]$，其中$m_t$为跖骨长度，$p_n$为第$n$节指骨的长度。F：将所有被测趾的长度以跖骨长度进行归一化处理。黑色实线为归一化长度的均值，黑色点虚线代表2σ区间，红色虚线对应经验曲线$p_n = m_t/[(n+1)×1.2]$。每张图表的上角标注了被测个体数量（N）。缩写说明：$m_t$，跖骨（metatarsals）；$p_1$–$p_5$，指骨（phalanges）。