Hellgrammites were created from dobsonfly larva. They no longer go through metamorphosis into a adult dobsonflies. They grow to a meter long and are able to reproduce in their larval forms.

Other modifications necessary to obtain their large size are complete gut, closed circulatory system modeled on that of cephalopods and internal gills that gill pouches have replaced the spiracles, trachea, and gill tufts.

Giant dobson fly larva that exhibits neoteny. A large, predatory aquatic invertebrate.

They come in shades of red, brown, gray and black.

They have long worm-like with a flattened head capsule, possessing a set large pincers and short antennae. The thorax is rounded and has three sets of jointed legs. The abdomen is longest part of the body and is dorsal-ventrally flattened. Eight pairs of gills filaments run along the side of the abdomen. The last segment of the abdomen is flat and wide forming a paddle that function as a flipper. The greater surface area of the rounded flipper allows for sharp turns and quick starts.

Three feet long and six-eight inches wide.

Large pincers.

Very.

Hunts in area with limited visibility. Muddy water or heavily planted.

Sometimes attacks prey on the water's surface or near the water's edge.

Biting, swimming in low visibility waters.

Fast for short bursts in the water. Slow on land.

Chemical and electrical senses.

Soft body. Limited exoskeleton and no bones. Poor eyesight.

Snapping of jaws.

They are mostly protein and the meat is frequently eaten. The jaws are often worn on necklaces or used for spears.

Fresh water streams.

Fish

Ovuliparity- males and females shed their gametes into the surrounding water.

Earth Hellgrammites.

Jumbo Grubs were developed by the special interest group "Why Change?" whose goal is promote the larval stage of various organism by engineering them to never metamorphosize into their adult form.

The offered to pay for part of the terraforming of Terra 47 if several of their larva lifeforms were incorporated into the ecosystems.

Ovuliparity- males and females shed their gametes into the surrounding water.