Bipalium

Bipalium is a genus of large predatory land planarians. They are often called "hammerhead worms" or "broadhead planarians" because of their head shape. Several species are considered as invasive to the United States and Europe. Some studies have been done on the evolution and ecology in these planarians.
The name "Bipalium" comes from Latin "bi-", “two” + "pala", “shovel” or “spade”. This is because their heads look like a pickaxe.
Species.
The genus "Bipalium" currently has the following species:
Feeding habits.
"Bipalium" species are predatory. Some species eat earthworms. Others eat mollusks. These flatworms can track their prey. When they eat earthworms, they begin to react to the attack. The flatworm then uses the muscles in its body to attach itself to the earthworm to make it so it can't escape.
Reproduction.
Reproduction in "Bipalium" may be asexual or sexual. All species are hermaphroditic.
"B. adventitium" reproduces sexually. They make egg capsules which hatch about 3 weeks later. The egg capsules have a tough outside. They usually have multiple children.
"B. kewense" sometimes are seen using egg capsules as a primary method of reproduction. Asexual reproduction is its main reproductive strategy in temperate climates. Many of them never get sexual organs. Children of this species aren't the same colors as their parents when they are young. This is unlike other species.
Toxicity.
In 2014, tetrodotoxin, a very dangerous neurotoxin, was found in "B. adventitium" and "B. kewense". It is the first record of tetrodotoxin in terrestrial invertebrates.