crescentic
131bluethroat — ▪ bird (Erithacus svecicus or Luscinia svecica), Eurasian chat thrush of the thrush family, Turdidae (order Passeriformes). The bluethroat is aobut 14 centimetres (5 1/2 inches) long and has a bright blue throat, incorporating a crescentic spot… …
132Dikelocephalus — ▪ trilobite genus genus of trilobites (extinct arthropods) that is a useful guide fossil for the Late Cambrian rocks (512 to 505 million years ago) of Europe and North America. Dikelocephalus is distinguished by its broad head, its large… …
