👉 Neopsephus is a species of fish in the family Siphonophoridae, found in tropical and subtropical waters worldwide. It belongs to the order Nematoda and is known for its unique characteristics that distinguish it from other siphonophores. These include its large size (up to 10 inches long), multi-fingered appendages, and its ability to grow rapidly by dividing at a rate of up to 20 times per day.