Supplementary material from "Centralized red muscle in Odontaspis ferox and the prevalence of regional endothermy in sharks" ...

• Main Authors: Dolton, Haley R., Snelling, Edward P., Deaville, Robert, Jackson, Andrew L., Perkins, Matthew W., Bortoluzzi, Jenny R., Purves, Kevin, Curnick, David J., Pimiento, Catalina, Payne, Nicholas L.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: The Royal Society 2023
• Subjects: Evolutionary biology not elsewhere classified; Cetorhinus maximus
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.6910728; https://rs.figshare.com/collections/Supplementary_material_from_Centralized_red_muscle_in_i_Odontaspis_ferox_i_and_the_prevalence_of_regional_endothermy_in_sharks_/6910728

The order Lamniformes contains charismatic species such as the white shark Carcharodon carcharias and extinct megatooth shark Otodus megalodon , and is of particular interest given their influence on marine ecosystems, and because some members exhibit regional endothermy. However, there remains significant debate surrounding the prevalence and evolutionary origin of regional endothermy in the Order, and therefore the development of phenomena such as gigantism and filter feeding in sharks generally. Here we show a basal ancestral lamniform shark, the smalltooth sand tiger shark Odontaspis ferox , has centralized skeletal red muscle and a thick compact-walled ventricle; anatomical features generally consistent with regionally endothermy. This result, together with the recent discovery of probably red muscle endothermy in filter feeding basking sharks Cetorhinus maximus , suggests that this thermophysiology is more prevalent in the Lamniformes than previously thought, which in turn has implications for ...