Proboscusacutidae perforossum

Proboscusacutidae is a family of ambulospeculidan creatures, descendant from land dwelling ancestors who developed eggs that could survive on land, with strongly ossified cartilage in their limbs and bodies, allowing them to grow to large sizes. However their spines remain largely cartilaginous and as such it's their exoskeleton that's provides necessary support and anchor points for muscles. The members of the family share certain features like a bony growth in the central, hypertrophied proboscis, thought to originally have been an adaptation to crack open eggs or drain prey and plants for nutrients. In most species it serves to dig up or impale food items while the other two trunks use their internal teeth and contracting muscles to then grind up and digest the food. However the ability to create negative pressure in the central trunk using its strong muscles, usually used for lifting, and a small hole in the bony spike allow these creatures to extract and drink liquids using the spike. Additionally their fourth pair of limbs has strongly atrophied and is no longer used for locomotion.

Proboscusacutidae perforossum are herbivores who subsist mostly on the many varieties of bonetrees that exist on the islands they inhabit, either by collecting and eating their fruit using their muscular and flexible trunks, or by digging into the bone trees themselves and sucking at the insides of the plant-like creatures. Their side trunks have especially adapted to grinding up the bony bark of the bone trees, allowing the burrowing creature to dig up into the tree from inside, using the absorbed and ground up material to them fortify their large burrows which usually hold between three and four family groups of the species. Different availability and adaptations of threes as well as competition from invasive species have led to the beginnings of speciation in the well adapted Perforossum, however it has not yet progressed far, only resulting in differing length of their bony growth in the central proboscus and size variations.
Perforossum have also adapted their hind limbs and back part of their armored bodies to hold their eggs and keep them warm against their bodies. This activity is usually carried out by the males and leads to higher survival rates in the offspring.

Anatomical features:

A.) The two trunks on the side have strong ringed muscles that allow them to contract and move matter downward toward the digestive tract. Usually only filled with small bony growths that grind up soft tissue, Perforossum have developed stronger muscles and larger 'teeth' to help them chew away bone matter.

B.) The central trunk contains the bony spike that gives the family of organisms its name. Due to their main source of food having bony protection, the Perforossum have adapted bony support structures on the outside which allow the spike to stay in place and repeatedly stab into the bone tree to penetrate into the parts of the plant that carry the most nutrients.

C.) Their powerful front limbs allow Perferossum to dig into soil and even scrape away at the bone tissue of its main food source. Additionally they are used to excavate burrows which are then reinforced using the almost clay like product of the mixture of ground up bone tissue and saliva.

D.) Due to it spending much time burrowing, this species has evolved filament structures that connect to nerve endings, giving them orientation through touch even through their hardy shells. These structures seem to be connected to the olfactory system as well, hinting at olfactory nerves being repurposed for thus adaptation.

E.) the back of the tail as well as the last pair of limbs are strongly reduced in all Proboscusacutidae. This has allowed them to repurpose that part of their bodies to keep their eggs warm. Using this trick greatly reduces the mortality rate of the offspring and also allow the creatures to remain mobile, even when their burrows or nests are destroyed. Being mostly sessile creatures, Perforossum seem to only rarely need to move, however it allows an entire burrow society to relocate without having to leave behind eggs or sufficiently young juveniles.