Leaf Insects
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The family Phylliidae (often misspelled Phyllidae) contains the
extant Extant or Least-concern species, least concern is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Exta ...
true leaf insects or walking leaves, which include some of the most remarkably
camouflage Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the leopard's spotted coat, the b ...
d leaf mimics (mimesis) in the entire animal kingdom. They occur from
South Asia South Asia is the southern Subregion#Asia, subregion of Asia that is defined in both geographical and Ethnicity, ethnic-Culture, cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's populatio ...
through
Southeast Asia Southeast Asia is the geographical United Nations geoscheme for Asia#South-eastern Asia, southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of the Mainland Au ...
to
Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...
. Earlier sources treat Phylliidae as a much larger taxon, containing genera in what are presently considered to be several different families.


Characteristics

Leaf insects are well
camouflage Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the leopard's spotted coat, the b ...
d, taking on the appearance of leaves. They do this so accurately that predators often are not able to distinguish them from real leaves. In some species, the edge of the leaf insect's body has the appearance of bite marks. To further confuse predators, when the leaf insect walks, it rocks back and forth, mimicking a real leaf being blown by the wind. The scholar
Antonio Pigafetta Antonio Pigafetta (; – c. 1531) was a Venetian scholar and explorer. In 1519, he joined the Spanish expedition to the Spice Islands led by Portuguese explorer Ferdinand Magellan, the world's first Magellan's circumnavigation, circumnavigation, ...
was probably the first Western person to document the creature, though it was known to people in the tropics for a long time. Sailing with
Ferdinand Magellan Ferdinand Magellan ( – 27 April 1521) was a Portuguese explorer best known for having planned and led the 1519–22 Spanish expedition to the East Indies. During this expedition, he also discovered the Strait of Magellan, allowing his fl ...
's
circumnavigation Circumnavigation is the complete navigation around an entire island, continent, or astronomical object, astronomical body (e.g. a planet or natural satellite, moon). This article focuses on the circumnavigation of Earth. The first circumnaviga ...
al expedition, he studied and chronicled the
fauna Fauna (: faunae or faunas) is all of the animal life present in a particular region or time. The corresponding terms for plants and fungi are ''flora'' and '' funga'', respectively. Flora, fauna, funga and other forms of life are collectively ...
on the
island An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been ...
of Cimbonbon as the fleet hauled ashore for repairs. During this time he documented the ''Phyllium'' species with the following passage:


Tribes, genera and species

The subfamily Phylliinae has been divided into two
tribes The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...
since 2003. This classification is not confirmed by more recent
molecular genetics Molecular genetics is a branch of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms. Molecular genetics often applies an "investigative approach" to determine the st ...
investigations. In addition to the fossil
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 ...
''
Eophyllium ''Eophyllium'' is an extinct monotypic genus of the Phasmatodea, a type of insect ancestral to the modern Phylliidae. These insects mimic the shape of leaves for camouflage, with a single species, ''Eophyllium messelensis''. Description A full b ...
'', the subfamily distinguishes thirteen recent genera, eight of which have been described since 2017. Within the ''
Phyllium ''Phyllium'' is the largest and most widespread genus of leaf insects in the family Phylliidae (Phasmatodea). They can be found in Sundaland, Philippine Islands, Wallacea, and Australasia. Species Within the genus ''Phyllium'', apart from ''P ...
'', previously there were several subgenera recognized, ''
Pulchriphyllium ''Pulchriphyllium'' is a genus of leaf insects. It was first established by Achille Griffini in 1898 as a subgenus within the genus ''Phyllium''. It has been elevated as a valid genus since 2021. The representatives of the genus are native to S ...
'' Griffini, 1898 '' Comptaphyllium'' and ''
Walaphyllium ''Walaphyllium'' is a genus of leaf insects comprising three species. It is found in Australia and Papua New Guinea. '' Walaphyllium monteithei'' is a popular pet, and is commonly bred throughout Europe and Australia. The name ''Walaphyllium'' ...
''. As of a 2021
phylogeny A phylogenetic tree or phylogeny is a graphical representation which shows the evolutionary history between a set of species or Taxon, taxa during a specific time.Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, M ...
, all three
subgenera In biology, a subgenus ( subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the ge ...
are now considered separate genera . Since 2021, in addition to morphological, molecular genetic studies have also increasingly been included in clarification of the
phylogeny A phylogenetic tree or phylogeny is a graphical representation which shows the evolutionary history between a set of species or Taxon, taxa during a specific time.Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, M ...
of Phylliidae. Their results show the general relationship between the genera, but when comparing female and male representatives, they do not yet provide a clear phylogenetic picture of the recent genera.
Cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ...
s of the Phylliidae species determined on the basis of molecular genetics analysis and morphological investigations according to Cumming and Le Tirant (2022): The ''Phasmida Species File (V. 5.0)'' lists the following genera in two
tribes The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...
:


Phylliini

Auth. * '' Chitoniscus'' (
Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...
) ** '' Chitoniscus feejeeanus'' ** '' Chitoniscus lobipes'' ** '' Chitoniscus lobiventris'' -
type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...
(as ''Phyllium lobiventre'' ) * '' Comptaphyllium'' (
Australasia Australasia is a subregion of Oceania, comprising Australia, New Zealand (overlapping with Polynesia), and sometimes including New Guinea and surrounding islands (overlapping with Melanesia). The term is used in a number of different context ...
) ** '' Comptaphyllium caudatum'' - type species (as ''Phyllium caudatum'' ) ** '' Comptaphyllium regina'' ** '' Comptaphyllium riedeli'' * '' Cryptophyllium'' ( SE Asia).
Selected species: ** '' Cryptophyllium athanysus'' ** '' Cryptophyllium celebicum'' - type species (as ''Phyllium celebicum'' ) ** '' Cryptophyllium westwoodii'' * '' Microphyllium'' (Northern
Philippine Islands The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
) ** '' Microphyllium haskelli'' ** '' Microphyllium spinithorax'' - type species * ''
Phyllium ''Phyllium'' is the largest and most widespread genus of leaf insects in the family Phylliidae (Phasmatodea). They can be found in Sundaland, Philippine Islands, Wallacea, and Australasia. Species Within the genus ''Phyllium'', apart from ''P ...
'' (
Sundaland Sundaland (also called Sundaica or the Sundaic region) is a biogeographical region of Southeast Asia corresponding to a larger landmass that was exposed throughout the last 2.6 million years during periods when sea levels were lower. It inc ...
, Philippine Islands,
Wallacea Wallacea is a biogeography, biogeographical designation for a group of mainly list of islands of Indonesia, Indonesian islands separated by deep-water straits from the Asian and Australia (continent), Australian continental shelf, continental ...
, Australasia).
Selected species: ** ''
Phyllium bilobatum ''Phyllium bilobatum'' is a species of leaf insect in the family Phylliidae. It is found in the Philippines and Malaysia. This species was first described in 1843 by the English zoologist George Robert Gray, who gave it the name ''Phyllium bilob ...
'' ** ''
Phyllium hausleithneri ''Phyllium hausleithneri'' or Hausleithner's stick insect is a species of phasmid or leaf insect of the genus '' Phyllium''. It is found in peninsular Malaysia, and Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri ...
'' ** ''
Phyllium jacobsoni ''Phyllium jacobsoni'' is a hybrid species of yellow/green leaf insect belonging to the family Phylliidae. Its recorded distribution is Java and no subspecies are listed in the Catalogue of Life. References Otte & Brock (2005), Phasmida Specie ...
'' ** ''
Phyllium letiranti ''Phyllium letiranti'' is a species of phasmid or walking leaf of the genus ''Phyllium''. It is only found on the island of Peleng in Indonesia. Etymology The specific name honors the collections manager of the Montreal Insectarium, Stépha ...
'' ** ''
Phyllium siccifolium ''Phyllium'' is the largest and most widespread genus of leaf insects in the family Phylliidae (Phasmatodea). They can be found in Sundaland, Philippine Islands, Wallacea, and Australasia. Species Within the genus ''Phyllium'', apart from ''P ...
'' - type species (as ''Gryllus siccifolius'' ) * '' Pseudomicrophyllium'' (Northern Philippine Islands) ** '' Pseudomicrophyllium geryon'' ** '' Pseudomicrophyllium pusillulum'' - type species (as ''Pseudomicrophyllium faulkneri'' ) * ''
Pulchriphyllium ''Pulchriphyllium'' is a genus of leaf insects. It was first established by Achille Griffini in 1898 as a subgenus within the genus ''Phyllium''. It has been elevated as a valid genus since 2021. The representatives of the genus are native to S ...
'' (
Seychelles Seychelles (, ; ), officially the Republic of Seychelles (; Seychellois Creole: ), is an island country and archipelagic state consisting of 155 islands (as per the Constitution) in the Indian Ocean. Its capital and largest city, Victoria, ...
,
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
, Western
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
, continental
Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...
)
Selected species: ** '' Pulchriphyllium bioculatum'' ( ** '' Pulchriphyllium giganteum'' ( ** '' Pulchriphyllium pulchrifolium'' - type species (as ''Phyllium pulchrifolium'' ) * '' Rakaphyllium'' (
New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...
and
Ayu Islands The Ayau Islands (Kepulauan Ayau) are a small archipelago located south of the Asia Islands and north of Waigeo Island within the Raja Ampat Islands of Indonesia. They are separated from Waigeo Island by the Bougainville Strait. The archipelago ...
) ** '' Rakaphyllium exsectum'' ** '' Rakaphyllium schultzei'' – type species (as ''Pulchriphyllium schultzei'' ) * '' Trolicaphyllium'' (Pacific) ** '' Trolicaphyllium brachysoma'' - type species (as ''Phyllium brachysoma'' ) ** '' Trolicaphyllium erosus'' ** '' Trolicaphyllium sarrameaense'' * '' Vaabonbonphyllium'' (New Guinea and
Solomon Islands Solomon Islands, also known simply as the Solomons,John Prados, ''Islands of Destiny'', Dutton Caliber, 2012, p,20 and passim is an island country consisting of six major islands and over 1000 smaller islands in Melanesia, part of Oceania, t ...
) ** '' Vaabonbonphyllium groesseri'' ( – type species (as ''Phyllium groesseri'' ) ** '' Vaabonbonphyllium rafidahae'' * ''
Walaphyllium ''Walaphyllium'' is a genus of leaf insects comprising three species. It is found in Australia and Papua New Guinea. '' Walaphyllium monteithei'' is a popular pet, and is commonly bred throughout Europe and Australia. The name ''Walaphyllium'' ...
'' (Australasia) ** '' Walaphyllium lelantos'' ** '' Walaphyllium monteithi'' ** '' Walaphyllium zomproi'' - type species (as ''Phyllium zomproi'' )


Nanophylliini

Auth. * '' Acentetaphyllium'' (New Guinea) ** '' Acentetaphyllium brevipenne'' – type species (as ''Phyllium brevipennis'' ) ** '' Acentetaphyllium larssoni'' ** '' Acentetaphyllium miyashitai'' ** '' Acentetaphyllium stellae'' * '' Nanophyllium'' (Southern Indonesia, New Guinea, NE Australia) ** '' Nanophyllium adisi'' ** '' Nanophyllium asekiense'' ** '' Nanophyllium australianum'' ** '' Nanophyllium chitoniscoides '' ** '' Nanophyllium daphne'' ** '' Nanophyllium frondosum'' ** '' Nanophyllium hasenpuschi'' ** '' Nanophyllium keyicum'' ** '' Nanophyllium pygmaeum'' – type species ** '' Nanophyllium rentzi'' ** '' Nanophyllium suzukii''


Captivity

Several species have gained in popularity as
pet A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive/ cute appearances, inte ...
s including '' Cryptophyllium celebicum'', '' Cryptophyllium westwoodii'', ''
Phyllium jacobsoni ''Phyllium jacobsoni'' is a hybrid species of yellow/green leaf insect belonging to the family Phylliidae. Its recorded distribution is Java and no subspecies are listed in the Catalogue of Life. References Otte & Brock (2005), Phasmida Specie ...
'', ''
Phyllium ericoriai ''Phyllium ericoriai'' is a species of leaf insect in the family Phylliidae The family Phylliidae (often misspelled Phyllidae) contains the Extant taxon, extant true leaf insects or walking leaves, which include some of the most remarkably ca ...
'', ''
Phyllium siccifolium ''Phyllium'' is the largest and most widespread genus of leaf insects in the family Phylliidae (Phasmatodea). They can be found in Sundaland, Philippine Islands, Wallacea, and Australasia. Species Within the genus ''Phyllium'', apart from ''P ...
'', ''
Phyllium letiranti ''Phyllium letiranti'' is a species of phasmid or walking leaf of the genus ''Phyllium''. It is only found on the island of Peleng in Indonesia. Etymology The specific name honors the collections manager of the Montreal Insectarium, Stépha ...
'', '' Phyllium monteithi'', '' Phyllium philippinicum '', '' Phyllium rubrum'', '' Phyllium tobeloense'', '' Pulchriphyllium bioculatum'' and '' Pulchriphyllium giganteum'' .


Extinct species

A 47-million-year-old fossil of ''
Eophyllium messelensis ''Eophyllium'' is an extinct monotypic genus of the Phasmatodea, a type of insect ancestral to the modern Phylliidae. These insects mimic the shape of leaves for camouflage, with a single species, ''Eophyllium messelensis''. Description A full b ...
'', a prehistoric ancestor of Phylliidae, displays many of the same characteristics of modern leaf insects, indicating that this family has changed little over time.


References

Cumming, R. T.; Bank, S.; Bresseel, J.; Constant, J; Le Tirant, S.; Dong, Z.; Sonet, G. & Bradler, S.:
Cryptophyllium, the hidden leaf insects – descriptions of a new leaf insect genus and thirteen species from the former celebicum species group (Phasmatodea, Phylliidae)
'ZooKeys 1018: 1–179 (2021)
Cumming, R. T.; Le Tirant, S. & Büscher, T. H. (2021) ''Resolving a century-old case of generic mistaken identity: polyphyly of Chitoniscus sensu lato resolved with the description of the endemic New Caledonia ''Trolicaphyllium'' gen. nov. (Phasmatodea, Phylliidae)'', ZooKeys 1055: 1–41 (2021), Cumming, R. T.; Teemsma, S. N. & Valero, P. (2018)
Description of Phyllium (Phyllium) conlei, new species, and a first look at the Phylliidae (Phasmatodea) of the Lesser Sunda Islands, Indonesia
'. Insecta mundi. Center for Systematic Entomology, Inc., Gainesville, FL USA. 2018
Cumming, R. T.; Le Tirant, S. & Hennemann F. H. (2019)
Review of the Phyllium Illiger, 1798 of Wallacea, with description of a new subspecies from Morotai Island (Phasmatodea: Phylliidae: Phylliinae)
', Faunitaxys, 7(4), Saint-Etienne, 2019: 1 – 25.
Cumming, R. T.; Thurman, J. H.; Youngdale, S. & Le Tirant, S. (2020)
Walaphyllium subgen. nov., the dancing leaf insects from Australia and Papua New Guinea with description of a new species (Phasmatodea, Phylliidae)
' ZooKeys 939:5 (2020)
Bank, S.; Cumming, R. T.; Li, Y.; Henze, K.; Le Tirant, S. & Bradler, S. (2021
A tree of leaves: Phylogeny and historical biogeography of the leaf insects (Phasmatodea: Phylliidae)
/ref> Cumming, R. T. & Le Tirant, S. (2022) ''Three new genera and one new species of leaf insect from Melanesia (Phasmatodea, Phylliidae)'', ZooKeys 1110: 151–200 (2022), doi:10.3897/zookeys.1110.80808


External links

*
Phasmid Study Group: Phylliidae
{{Taxonbar, from1=Q282198, from2=Q15240868 Phasmatodea families Taxa named by Ludwig Redtenbacher pl:Liściec