Fibonaccus garyus
Fibonaccus garyus is a marine Ossuran, reaching 10-13cm. It has circles of chitinous pointed teeth that it uses to scrape up food as well as paired flexible appendages just in front of the mouth to help push food into the mouth. They have a hollowed pink spiral shell, that follows the Fibonacci sequence, with blue spots and a reddish colored spiral. F. garyus will ingest sand to acquire calcium for growing their shell. They are capable of pulling their body in the shell for protection.F. garyus has a brain in the head with a nerve chord running down the dorsum into the shell. It has paired flexible chemosensitive stalks on the head. On either side of the head their sets of external gills diffuse dissolved oxygen from the water into the blood which is then pumped throughout the body by the heart. F. garyus moves using muscular contractions of a large flat foot.
F. garyus feeds on detritus and carrion. The digestive tract starts with a crop used for storing food before digestion, next is the stomach where the food is digested, then the waste is moved further along where water and salts are reabsorbed before being excreted from the anus which forms a hole in the back of the shell.
They are hermaphroditic and are capable of self fertilization. The gonads are connected to the digestive tract just before the anus. The gonads will produce sperm which is released through the anus. The ovary is separate and has a single genital opening on the foot of the Muscal. When mating individuals will line up their anus and genital openings with each other to fertilize each other. Shortly after fertilization the eggs are laid in the substrate. The eggs will hatch in month into 0.5cm long immatures that mostly resemble the adults.