Paleotriatoma

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Paleotriatoma
Temporal range: Albian–Cenomanian
Paleotriatoma metaxytaxa.jpg
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P. metaxytaxa

Poinar, 2018
Binomial name
Paleotriatoma metaxytaxa
Poinar, 2018

Paleotriatoma metaxytaxa is a species of fossil insect belonging to the subfamily Triatominae (kissing bugs) of the family Reduviidae. Living kissing bugs are blood-sucking insects responsible for the transmission of Chagas disease. [1] Chagas is a parasitic disease affecting millions of people mainly in South America, Central America and Mexico. [2]

Contents

The species was described from a single specimen with excellent preservation. The specimen was preserved in amber, in deposits from the Middle Cretaceous (possibly Albian) age. The specimen contains developing flagellated trypanosomes in its hindgut, suggesting that early triatomines might have been transmitting pathogenic protozoa to vertebrates as early as 100 million years (Ma). [1]

Etymology

The name of the genus, Paleotriatoma, comes from the Greek “paleo” = ancient and the name of the existing genus, Triatoma . The specific epithet, that is, the term metaxytaxa, is taken from the Greek “metxy” = between and also from the Greek, “tasso” = to dispose, referring to the intermediate state of the fossil, which has anatomical characteristics of Reduviinae and Triatominae. [1]

Preservation of the specimen

The species P. metaxytaxa was described from a single fossil male specimen with excellent preservation. The quality of the preservation is due to the fact that they were preserved in amber, which is the result of the petrification (diagenesis) of tree resins in which numerous remains of organisms were trapped while they were alive. [1]

The specimen was found at the Noije Bum Mount Amber Mine, excavated in the Hukawng Valley and located southwest of Maingkhwan in the Kachin State of Burma. [3] Based on paleontological evidence, this site was dated as late Albian, in the Lower Cretaceous, with ages between 97 and 110 million years. A more recent study used U-Pb dating of zircons, which determined the age to be 98.79 ± 0.62 million years. This result places these deposits on the border between the Albian and the Cenomanian. [4] Burmese amber would have been formed from the resin emanating from a tree within the Araucariaceae group, possibly from the Agathis genus. [5]

Importance in the evolutionary and biogeographic knowledge of the species

With the exception of triatomines (kissing bugs, vinchuca, and various other names), species in the Reduviidae family feed on insects, which they prey on. Living triatomines are exclusively hematophagous, that is, they feed by sucking the blood of vertebrates. Paleotriatoma metaxytaxa, contains a predominance of Triatominae anatomical features, as well as some Reduviinae characters. Therefore, it is considered an intermediate fossil representing an early progenitor of the Triatominae. [1] Since the Triatominae probably evolved from the Reduviinae, insect feeding can be considered a primitive characteristic. It is inferred then that the first triatomines probably fed on both insects and vertebrates, and that hematophagy originated only once in the family Reduviidae. [6] Likewise, the first triatomines that fed on vertebrates would have been transient forms. which possessed both Triatominae and Reduviinae morphological characteristics, similar to P. metaxytaxa. [1]

Triatomines, that is, blood-sucking bugs, were previously considered to be endemic to South America. It was argued that their diversification was due to changes resulting from the uplift of the Andes and variations in sea levels in North America, which isolated the subcontinent. Evidence now indicates that triatomines originated in Gondwana. The fossil of P. metaxytaxa, found in Myanmar, is not an exception: the portion of Earth's crust containing the amber deposits migrated from Gondwana to its current location. [1] This scenario is consistent with the current distribution of the subfamily with important representatives in America South, Africa, India and Australia.

Related Research Articles

<span class="mw-page-title-main">Reduviidae</span> Family of insects

The Reduviidae is a large cosmopolitan family of the order Hemiptera. Among the Hemiptera and together with the Nabidae almost all species are terrestrial ambush predators; most other predatory Hemiptera are aquatic. The main examples of nonpredatory Reduviidae are some blood-sucking ectoparasites in the subfamily Triatominae. Though spectacular exceptions are known, most members of the family are fairly easily recognizable; they have a relatively narrow neck, sturdy build, and a formidable curved proboscis. Large specimens should be handled with caution, if at all, because they sometimes defend themselves with a very painful stab from the proboscis.

<span class="mw-page-title-main">Triatominae</span> Subfamily of true bugs

The members of the Triatominae, a subfamily of the Reduviidae, are also known as conenose bugs, kissing bugs, or vampire bugs. Other local names for them used in the Americas include barbeiros, vinchucas, pitos, chipos and chinches. Most of the 130 or more species of this subfamily feed on vertebrate blood; a very few species feed on invertebrates. They are mainly found and widespread in the Americas, with a few species present in Asia and Africa. These bugs usually share shelter with nesting vertebrates, from which they suck blood. In areas where Chagas disease occurs, all triatomine species are potential vectors of the Chagas disease parasite Trypanosoma cruzi, but only those species that are well adapted to living with humans are considered important vectors. Also, proteins released from their bites have been known to induce anaphylaxis in sensitive and sensitized individuals.

<i>Triatoma</i> Genus of true bugs

Triatoma is a genus of assassin bug in the subfamily Triatominae. The members of Triatoma are blood-sucking insects that can transmit serious diseases, such as Chagas disease. Their saliva may also trigger allergic reactions in sensitive individuals, up to and including severe anaphylactic shock.

<i>Panstrongylus geniculatus</i> Species of true bug

Panstrogylus geniculatus is a blood-sucking sylvatic insect noted as a putative vector of minor importance in the transmission of Trypanosoma cruzi to humans; this is a parasite, which causes Chagas disease. The insect is described as sylvatic; subsisting primarily in humid forests, and is also known to inhabit vertebrate nesting places such as those of the armadillo, and is also involved in enzootic transmission of T. cruzi to those species. It has wide distribution throughout 16 Latin American countries.

<i>Triatoma nigromaculata</i> Species of true bug

Triatoma nigromaculata is a sylvatic species of insect usually found in hollow trees, in vertebrate nests on trees and occasionally in human dwellings. It usually lives in relatively humid forests at high altitudes on mountain regions and foot hills. As all members of the subfamily Triatominae, T. nigromaculata is a blood-sucking bug and a potential vector of Chagas disease. This species is distributed mainly in Venezuela, but some specimens have also been found in Perú and Colombia (Cauca).

<i>Triatoma dominicana</i> Extinct species of true bug

Triatoma dominicana is an extinct species of assassin bug in the subfamily Triatominae, the kissing bugs known from early Miocene Burdigalian stage Dominican amber deposits on the island of Hispaniola.

<i>Trypanosoma antiquus</i> Extinct species in the kinetoplast class

Trypanosoma antiquus is an extinct species of kinetoplastid, a monophyletic group of unicellular parasitic flagellate protozoa.

Albicoccus is an extinct genus of scale insect in the extinct monotypic family Albicoccidae, containing a single species, Albicoccus dimai. The genus is solely known from the Albian - Cenomanian Burmese amber deposits.

<span class="mw-page-title-main">Burmese amber</span> Late Cretaceous amber from Northern Myanmar

Burmese amber, also known as Burmite or Kachin amber, is amber from the Hukawng Valley in northern Myanmar. The amber is dated to around 100 million years ago, during the latest Albian to earliest Cenomanian ages of the mid-Cretaceous period. The amber is of significant palaeontological interest due to the diversity of flora and fauna contained as inclusions, particularly arthropods including insects and arachnids but also birds, lizards, snakes, frogs and fragmentary dinosaur remains. The amber has been known and commercially exploited since the first century AD, and has been known to science since the mid-nineteenth century. Research on the deposit has attracted controversy due to its alleged role in funding internal conflict in Myanmar and hazardous working conditions in the mines where it is collected.

Burmaleon is an extinct genus of lacewing in the family Osmylidae known from fossils found in Asia. The genus contains a single species, Burmaleon magnificus.

Alienopterus brachyelytrus is an extinct insect described from a 99 million year old fossil found in Burmese amber from the Hukawng Valley of Myanmar. It was the first known member of the order Alienoptera until 2018, when the second and third members of the order, Caputoraptor elegans, and Alienopterella stigmatica were described. A. brachyelytrus has characters that are shared with cockroaches and mantids and is thought to represent either the sister taxon, or an ancestor to mantids.

2019 in paleoentomology is a list of new fossil insect taxa that were described during the year 2019, as well as other significant discoveries and events related to paleoentomology that were scheduled to occur during the year.

Discoscapa apicula is an extinct species of crabronid wasp, formerly considered one of the two oldest-known species of bees. The species was described from an amber inclusion in Burmese Amber in 2020 by George Poinar Jr., a zoologist at Oregon State University. The fossil was found in a mine in the Hukawng Valley of northern Myanmar and is believed to date from the Cretaceous Period, 100 million years ago, the same age as Melittosphex burmensis, likewise previously considered the oldest known bee species; as it comes from the same amber deposit, these two specimens are considered to be the same approximate age. More recent research has concluded that D. apicula is a wasp belonging to the subfamily Crabroninae, placed in its own tribe, Discoscapini.

<i>Oculudentavis</i> Extinct genus of reptiles

Oculudentavis is an extinct genus of lizard of uncertain taxonomic placement, originally identified as an avialan dinosaur. It contains two known species, O. khaungraae and O. naga. Each species is known from one partial fossil specimen in Burmese amber, which differ in several proportions. Their skulls measure 1.4–1.7 centimetres (0.55–0.67 in) in length, indicating that Oculudentavis would have been comparable in size with the modern bee hummingbird if it were an avialan. Both specimens were retrieved from 99-million-year-old deposits of the Hukawng Basin in Kachin State, northern Myanmar. The type specimen of O. khaungraae is embroiled in controversy regarding its identity and the ethical issues surrounding the acquisition and study of Burmese amber. The original description advocating for an avialan identity was published in Nature, but has since then been retracted from the journal.

2020 in paleoentomology is a list of new fossil insect taxa that were described during the year 2020, as well as other significant discoveries and events related to paleoentomology that were scheduled to occur during the year.

2015 in paleoentomology is a list of new fossil insect taxa that were described during the year 2016, as well as other significant discoveries and events related to paleoentomology that were scheduled to occur during the year.

Burmese amber is fossil resin dating to the early Late Cretaceous Cenomanian age recovered from deposits in the Hukawng Valley of northern Myanmar. It is known for being one of the most diverse Cretaceous age amber paleobiotas, containing rich arthropod fossils, along with uncommon vertebrate fossils and even rare marine inclusions. A mostly complete list of all taxa described up until 2018 can be found in Ross 2018; its supplement Ross 2019b covers most of 2019.

Cretamystilus is an extinct genus of mirid insect in the tribe Mecistoscelini known from a fossil preserved in a piece of Cenomanian Burmese amber from the Hukawng Valley, Myanmar. Cretamystilus, which was the first extinct genus to be named in 2021, contains a single species, C. herczeki. Cretamystilus is the first member of the Miridae in the fossil record known to date. It probably had a host association with bamboo plants, which is only hypothesized, and morphological characters of the holotype and similarity to the extant genus Mystilus are also present in Cretamystilus.

Liadopsyllidae is an extinct family of hemipteran insects belonging to Psylloidea ranging from the Early Jurassic to Upper Cretaceous. The family was named by Andrey Vasilyevich Martynov in 1926. They are the earliest known members of Psylloidea, with modern members of the group not known until the Paleogene, as such, they have been suggested to be a paraphyletic assemblage ancestral to modern psylloids. The family Malmopsyllidae has been subsumed into this family, but is considered distinct by some authors.

References

  1. 1 2 3 4 5 6 7 Poinar, George (January 2019). "A primitive triatomine bug, Paleotriatoma metaxytaxa gen. et sp. nov. (Hemiptera: Reduviidae: Triatominae), in mid-Cretaceous amber from northern Myanmar". Cretaceous Research. 93: 90–97. doi:10.1016/j.cretres.2018.09.004. S2CID   134969065.
  2. "Chagas disease". www.who.int. Retrieved 2023-04-06.
  3. Cruickshank, R.D; Ko, Ko (February 2003). "Geology of an amber locality in the Hukawng Valley, Northern Myanmar". Journal of Asian Earth Sciences. 21 (5): 441–455. doi:10.1016/S1367-9120(02)00044-5.
  4. Shi, Guanghai; Grimaldi, David A.; Harlow, George E.; Wang, Jing; Wang, Jun; Yang, Mengchu; Lei, Weiyan; Li, Qiuli; Li, Xianhua (October 2012). "Age constraint on Burmese amber based on U–Pb dating of zircons". Cretaceous Research. 37: 155–163. doi:10.1016/j.cretres.2012.03.014.
  5. Poinar, George; Lambert, Joseph B.; Wu, Yuyang (2007). "Araucarian Source of Fossiliferous Burmese Amber: Spectroscopic and Anatomical Evidence". Journal of the Botanical Research Institute of Texas. 1 (1): 449–455. ISSN   1934-5259. JSTOR   41971435.
  6. Weirauch, Christiane; Munro, James B. (October 2009). "Molecular phylogeny of the assassin bugs (Hemiptera: Reduviidae), based on mitochondrial and nuclear ribosomal genes". Molecular Phylogenetics and Evolution. 53 (1): 287–299. doi:10.1016/j.ympev.2009.05.039. PMID   19531379.