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Abbreviations: ca1, first caudal vertebra; cr1, first caudal rib; lsr1–2, left sacral ribs 1–2; ns, neural spine; prz, prezygapophysis of first sacral vertebra; psz, postzygapophysis of first sacral vertebra; rsr1–2, right sacral ribs 1–2; s1–2, sacral vertebrae 1–2.
