10027/21238 John A. Wilk John A. Wilk Evolution of the Isognomonidae Woodring, 1925: Phylogenetic and Morphometric Analyses University of Illinois at Chicago 2016 Phylogeny Taxonomy Geometric Morphometrics Allometry Ontogeny Classification Ecophenotypic Variation Species Delimitation Bivalves Pterioidea Isognomon Procrustes Alignment 2016-10-18 00:00:00 Thesis https://indigo.uic.edu/articles/thesis/Evolution_of_the_Isognomonidae_Woodring_1925_Phylogenetic_and_Morphometric_Analyses/10877192 The Isognomonidae Woodring, 1925 are a pan-tropical family of bivalves that share a system of hinge-ligament strengthening elements called resilifers and a tendency for highly variable shell-shapes. Using an innovative combination of molecular phylogenetics and geometric morphometric shape analysis I directly compare identified genetic groups to the original type-specimen shells. This method was used to produce a robust taxonomic revision where synonymy was tested empirically. Using a novel, vector-based, approach to describe ontogenetic trends within related groups I also evaluated the deeper clades revealed by the phylogenetic analysis for taxonomic utility. The resulting classification designates this monophyletic group as a sub-family, Isognomoninae, which is divided into two genera, Isognomon and Melina, which contain 21-22 species.