TABLE 2 in Shell histology of the Triassic turtle, Proterochersis porebensis Szczygielski & Sulej, 2016, provides novel insights about shell ankylosis
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TABLE 2. — Comparison of the cavitated peripheral structures in australochelyids (represented by Waluchelys cavitesta as documented by Sterli et al. (2021)) and proterochersids (represented by Proterochersis porebensis Szczygielski & Sulej, 2016 ZPAL V. 39/482). Waluchelys cavitesta Sterli, Martínez, Cerda & Apaldetti, 2020Proterochersis porebensis Szczygielski & Sulej, 2016Internal peripheral cavityPresentPresentDiploe-structured bonePresentPresentExternal cortexInterwoven structural fibersPresentPresentVascularizationPoor to avascularPoorGrowth marksPresentPresentSpongiosa thicker than the corticesPresentPresentPerimedullary cortexInterwoven structural fibersPresentPresentStructural stratificationLocalLocalVascularization near the spongiosaPoor to avascularPoor to avascularVascularization near the medullary cavityBetter than in the external cortexBetter than in the external cortexGrowth marksClose to the spongiosaPresentSuturesAbsentPresentTendency for complete shell ankylosisYESYES
