noun, Cell Biology. 1. a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum) involved in the transport of materials.
The most widely distributed of all sea turtles; found in the Gulf of Alaska and south of the Bering Sea in the northeastern Pacific to Chile in the southeastern Pacific. In the Barents Sea, Newfoundland and Labrador in the North Atlantic; around Argentina and South Africa in the South Atlantic.
Alligator snapping turtles are the worldâs largest freshwater turtle species. Shells can exceed 30 inches in length, and males can weigh up to 200 pounds. Range. Southeastern U.S., extending along the Mississippi River as far north as Iowa.