The prawn is a large extinct invertebrate marine animal and the largest known Cambrian animal  The fossils show that the mouthparts of this animal have more than a dozen rows of teeth, 25 cm in diameter, and the fecal fossil is 10 cm long  It is 5 cm thick
For large invertebrates, the more teeth they have, means they have longer body.
 It is speculated that the body length of the odd shrimp may exceed 2 meters