“Perigastric organ”: a replacement name for the “hepatopancreas” of Decapoda

Since its first description in 1848, many names have been given to the key organ of the gastro-intestinal tract of Decapoda, which have caused much confusion. Even the most commonly accepted name, “hepatopancreas,” is inappropriate because this organ inherently differs from the liver and pancreas of vertebrates. We briefly discuss the embryology, gross anatomy, histology, and physiology of the “hepatopancreas.” The names “perigastric organ” and “perigaster” (from the Greek peri- for “around” and “enclosing,” and gaster for “stomach”) are proposed as a replacement of “hepatopancreas.” This new name considers the topography of the organ without referring to its anatomy and physiology.