Comparison of oostegite shapes in some gammaroidean species (Crustacea: Amphipoda)

Within the superfamily Gammaroidea oostegites vary from broad (primitive) to narrow (advanced). Broad oostegites are found in members of the Acanthogammaridae, Macrohectopidae and a few of the Gammaridae. Most species of the family Gammaridae have broad anterior oostegites and narrow posterior ones. Marine Gammarus species and Echinogammarus show a narrowing trend in the anterior oostegites as well.