The Regional Centers for Security Studies support the National Defense Strategy and DoD. security cooperation priorities with programs designed to enhance security, deepen. understanding of the United States, foster bilateral and multilateral partnerships, improve.
Of the 650 species of leech listed, Hirudo medicinalis is one of the most extensively studied. This annelid from the subclass Hirudinea has 2 suckers, one housing the mouth and its 3 jaws. It lives mainly in the stagnant waters of marshes and ponds. When it comes to reproduction, the animal is a hermaphrodite. Inseminated leeches lay their eggs during the spring and summer months, outside the water, with cocoons containing as many as thirty young.
The basic approach is to come up with a basic body compartment, like cars on a train, and build up a body by adding more. It is a quick and simple way to add size, and segmented worms, also known as annelids, are the prototypes. The leeches are less segmented than the other types, although the basic body plan of the adult almost always starts with 34 segments between front and back (this is common in other segmented groups, where a set number of segments arises in embryos as the base architecture).