👉 In biology, a proboscidea is an animal that has a long, conical mouth. These animals are characterized by their elongated beaks and large tongues, which they use to extract food from animals or plants. The tongue can extend up to 5-6 inches in length and can be used for sucking, chewing, and swallowing. Proboidea include the lionfish, a species of fish that has a long, slender mouth and is native to the Pacific Ocean.