Amphibious caterpillar refers to over 40

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of semiaquatic

caterpillar Caterpillars ( ) are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths). As with most common names, the application of the word is arbitrary, since the larvae of sawflies (suborder ...

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Hawaii Hawaii ( ; ) is an island U.S. state, state of the United States, in the Pacific Ocean about southwest of the U.S. mainland. One of the two Non-contiguous United States, non-contiguous U.S. states (along with Alaska), it is the only sta ...

that are the only insect larvae that live as readily in water as on land. In 2010, Daniel Rubinoff and Patrick Schmitz at the University of Hawaii at Manoa first described the amphibious habits of the larvae in the

moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyletic with respect to butterflies (s ...

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

'' Hyposmocoma'' of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Cosmopterigidae The Cosmopterigidae are a family of insects (cosmet moths) in the order Lepidoptera. These are small moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previ ...

. Young of each

thrive both underwater in rushing streams and exposed to air on rocks poking out of the water. Rubinoff states, "These species are at least as different as chimpanzees are from us". While some other caterpillars can survive for short periods under water, they are possibly the only air-breather that can thrive exclusively there. "No other animal that breathes air can handle being submerged for a month", he says. These caterpillars do not have

gill A gill () is a respiration organ, respiratory organ that many aquatic ecosystem, aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow r ...

s or anything that covers the

trachea The trachea (: tracheae or tracheas), also known as the windpipe, is a cartilaginous tube that connects the larynx to the bronchi of the lungs, allowing the passage of air, and so is present in almost all animals' lungs. The trachea extends from ...

to operate marine mammals' surface-to-breathe technique for respiration. Instead they appear to absorb

oxygen Oxygen is a chemical element; it has chemical symbol, symbol O and atomic number 8. It is a member of the chalcogen group (periodic table), group in the periodic table, a highly reactivity (chemistry), reactive nonmetal (chemistry), non ...

directly through pores in their "skin" from the enveloping water. The caterpillars require flowing water to provide sufficient oxygen. They spin "

silk Silk is a natural fiber, natural protein fiber, some forms of which can be weaving, woven into textiles. The protein fiber of silk is composed mainly of fibroin and is most commonly produced by certain insect larvae to form cocoon (silk), c ...

" tethers to attach themselves to the downstream sides of rocks to keep from washing away. They cover themselves with silk "cases" in a variety of shapes and sizes that they add to as they grow, with names such as cones, bugles, burritos,

cigar A cigar is a rolled bundle of dried and Fermentation, fermented tobacco leaves made to be Tobacco smoking, smoked. Cigars are produced in a variety of sizes and shapes. Since the 20th century, almost all cigars are made of three distinct comp ...

s, candy wrappers, oyster shells, dog bones and bow ties. Rubinoff and Schmitz estimate that this assemblage of species has probably been evolving in the Hawaiian Islands for roughly 20 million years. The dating comes from a three-

gene In biology, the word gene has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protei ...

analysis of 89 species, calibrated with the ages of various islands. Each species has so far been found on only one island, typically in only one locale. Three separate lineages of moth independently developed this ability at different points in the past.

Footnotes

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External links

"James Bond, Caterpillar"
Article and video featuring Hyposmocoma. '' Maui No Ka 'Oi Magazine'' Volume 14 Number. 3 (July 2010). Moths of Oceania Endemic moths of Hawaii Amphibious organisms