Patterns and processes in the history of body size in turritelline gastropods, Jurassic to Recent

• DOI: 10.1017/pab.2023.7
• Publication Date: 2023-03-20T08:32:13Z
• Authors: Carlie Pietsch; Michael Gigliotti; Brendan M. Anderson; Warren D. Allmon
• Keywords: Trait; Origination; Macroevolution; Body plan

Abstract Body size is an important trait with implications for energy use and ecology as well generation time evolutionary rates. Turritelline gastropods are widely distributed through geologic space, making them excellent group evaluating macroevolutionary patterns. To evaluate the pattern of body-size change in turritelline gastropods, we compiled a dataset shell lengths 316 species spanning Jurassic to Recent. Type specimens were almost always significantly larger than specimen distributions from same species. We found that gastropod was inversely correlated latitude, trend likely driven by Neogene–Recent diversification small-bodied Southern Hemisphere taxa. A series model applied distinguish among three possible patterns: unbiased random walk (no directional trend), biased (directional stasis net change). determined have experienced body throughout their history, adding growing literature documenting directionless trends marine invertebrate clades. Stasis geographically widespread clades may be result ecological variability across environmental range occupied or differential into opposing environments. life-history patterns, especially reproductive strategy combines short life span decline growth rate around 1 year age reallocate reproduction, might circumvent selection longevity size, while further decrease minimum limited feeding efficiency anti-predatory defense. The expectation should continue evolve occupy classes conflicts advantages small which include high generational turnover population sizes yield opportunities genetic variance.