Gigatitan

Last updated

Gigatitan
Temporal range: Carnian
Gigatitan PIN 22404593.png
Fossil of G. vulgaris
Gigatitan vulgaris.jpg
Life reconstruction of G. vulgaris
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Titanoptera
Clade: Gigatitanidae
Genus: Gigatitan
Sharov, 1968
Type species
Gigatitan vulgaris
Sharov, 1968
Species [1]
  • G. vulgarisSharov, 1968
  • G. magnificusSharov, 1968
  • G. extensusSharov, 1968
  • G. ovatusSharov, 1968
  • G. similisSharov, 1968

Gigatitan is an extinct genus of titanopteran insect that lived in Kyrgyzstan during the Triassic period. The type species is G. vulgaris, described by Aleksandr Grigorevich Sharov in 1968. [2] Fossils of Gigatitan have been found in the Madygen Formation. [3] It is the type genus of the family Gigatitanidae, in which the closely related Nanotitan and Ootitan are also included. [2] [4]

Description

Reconstruction of G. vulgaris Gigatitan vulgaris reconstruction.png
Reconstruction of G. vulgaris

Gigatitan was a large insect, type species, G. vulgaris is estimated to have wingspan up to 40 centimetres (16 in). [5] Although it had large wings, which hindwing area is close to modern large orthopteran Pseudophyllanax imperialis , body volume is estimated to be around 150% heavier than that species, suggesting Gigatitan was not able to fly, but probably able to glide. [1] In life, Gigatitan was a mantis-like predator, with forelegs that have similarly enlarged and bore spines for prey capture. [6] It had dark, transverse stripes on its wings, which is similar to modern diurnal mantis Blepharopsis mendica . Also, its wings were able to produce flashes which works only during day, and possibly it can substantially reduce predation from predators. These characters suggest that Gigatitan was a diurnal predator. [1] As seen in other titanopteran insects, there are prominent fluted regions on the forewings, suggesting that may used for stridulation, but unlike modern crickets or katydids, both males and females of Gigatitan had wings for stridulation. [1] The ovipositor of Gigatitan bore sharp cutting ridges. These were likely used to excise holes in plant matter for oviposition, similar to some modern Orthoptera. [7]

Related Research Articles

<span class="mw-page-title-main">Anostostomatidae</span> Family of cricket-like animals

Anostostomatidae is a family of insects in the order Orthoptera, widely distributed in the southern hemisphere. It is named Mimnermidae or Henicidae in some taxonomies, and common names include king crickets in Australia and South Africa, and wētā in New Zealand. Prominent members include the Parktown prawn of South Africa, and the giant wētā of New Zealand. The distribution of this family reflects a common ancestry before the fragmenting of Gondwana.

<span class="mw-page-title-main">Cupedidae</span> Family of beetles

The Cupedidae are a small family of beetles, notable for the square pattern of "windows" on their elytra, which give the family their common name of reticulated beetles.

<span class="mw-page-title-main">Dictyoptera</span> Superorder of insects

Dictyoptera is an insect superorder that includes two extant orders of polyneopterous insects: the order Blattodea and the order Mantodea (mantises). All modern Dictyoptera have short ovipositors and typically lay oothecae. The oldest fossils of Dictyoptera from the Late Carboniferous, referred to as "roachoids" have long ovipositors and did not lay oothecae. The oldest modern oothecae-laying dictyopterans date to the Late Triassic.

<span class="mw-page-title-main">Trachypachidae</span> Family of beetles

The Trachypachidae are a family of beetles that generally resemble small ground beetles, but that are distinguished by the large coxae of their rearmost legs. There are only six known extant species in the family, with four species of Trachypachus found in northern Eurasia and northern North America, and two species of Systolosoma in Chile and Argentina. They were much more diverse in the past, with dozens of described species from the Mesozoic.

<i>Fruitafossor</i> Extinct family of mammals

Fruitafossor was a termite-eating mammal endemic to North America during the Late Jurassic epoch.

<span class="mw-page-title-main">Ensifera</span> Suborder of cricket-like animals

Ensifera is a suborder of insects that includes the various types of crickets and their allies including: true crickets, camel crickets, bush crickets or katydids, grigs, weta and Cooloola monsters. This and the suborder Caelifera make up the order Orthoptera. Ensifera is believed to be a more ancient group than Caelifera, with its origins in the Carboniferous period, the split having occurred at the end of the Permian period. Unlike the Caelifera, the Ensifera contain numerous members that are partially carnivorous, feeding on other insects, as well as plants.

<span class="mw-page-title-main">Caelifera</span> Suborder of insects

The Caelifera are a suborder of orthopteran insects. They include the grasshoppers and grasshopper-like insects, as well as other superfamilies classified with them: the ground-hoppers (Tetrigoidea) and pygmy mole crickets (Tridactyloidea). The latter should not be confused with the mole crickets (Gryllotalpidae), which belong to the other Orthopteran sub-order Ensifera.

The most recent understanding of the evolution of insects is based on studies of the following branches of science: molecular biology, insect morphology, paleontology, insect taxonomy, evolution, embryology, bioinformatics and scientific computing. It is estimated that the class of insects originated on Earth about 480 million years ago, in the Ordovician, at about the same time terrestrial plants appeared. Insects are thought to have evolved from a group of crustaceans. The first insects were landbound, but about 400 million years ago in the Devonian period one lineage of insects evolved flight, the first animals to do so. The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects. The Pterygotes underwent a major radiation in the Carboniferous while the Endopterygota underwent another major radiation in the Permian.

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

Sharovipteryx is a genus of early gliding reptiles containing the single species Sharovipteryx mirabilis. It is known from a single fossil and is the only glider with a membrane surrounding the pelvis instead of the pectoral girdle. This lizard-like reptile was found in 1965 in the Madygen Formation, Dzailauchou, on the southwest edge of the Fergana Valley in Kyrgyzstan, in what was then the Asian part of the U.S.S.R. dating to the middle-late Triassic period. The Madygen horizon displays flora that put it in the Upper Triassic. An unusual reptile, Longisquama, was also found there.

"Roachoids", also known as "Roachids", "Blattoids" or Eoblattodea, are members of the stem group of Dictyoptera. They generally resemble cockroaches, but most members, unlike modern dictyopterans, have generally long external ovipositors, and are thought not to have laid ootheca like modern dictyopterans.

<span class="mw-page-title-main">Titanoptera</span> Extinct order of insects

Titanoptera is an extinct order of neopteran insects from late Carboniferous to Triassic periods. Titanopterans were very large in comparison with modern insects, some having wingspans of up to 36 centimetres (14 in) or even 40 centimetres (16 in).

<span class="mw-page-title-main">Coxoplectoptera</span> Extinct order of insects

Coxoplectoptera or "chimera wings" is an extinct order of stem-group mayflies containing one family, Mickoleitiidae.

Kyrgyzsaurus is an extinct genus of drepanosaurid reptile known from the Triassic of southwestern Kyrgyzstan. It was discovered in the Madygen Formation.

The Madygen Formation is a Late Triassic (Carnian) geologic formation and Lagerstätte in the Batken and Osh Regions of western Kyrgyzstan, with minor outcrops in neighboring Tajikistan and Uzbekistan. The conglomerates, sandstones and mudstones of the 560 m (1,840 ft) thick formation were deposited in terrestrial lacustrine, alluvial, fluvial and deltaic environments.

<span class="mw-page-title-main">Hexapoda</span> Subphylum of arthropods

The subphylum Hexapoda or hexapods comprises the largest clade of arthropods and includes most of the extant arthropod species. It includes the crown group class Insecta, as well as the much smaller class Entognatha, which includes three orders of wingless arthropods that were once considered insects: Collembola (springtails), Protura (coneheads) and Diplura. The insects and springtails are very abundant and are some of the most important pollinators, basal consumers, scavengers/detritivores and micropredators in terrestrial environments.

The Hassberge Formation is a geologic formation in Bavaria, Germany. It preserves fossils dating back to the Carnian stage of the Triassic period.

<span class="mw-page-title-main">Polyneoptera</span> Group of insects

The cohort Polyneoptera is a proposed taxonomic ranking for the Orthoptera and all other neopteran insects believed to be more closely related to Orthoptera than to any other insect orders. They were formerly grouped together with the Palaeoptera and Paraneoptera as the Hemimetabola or Exopterygota on the grounds that they have no metamorphosis, the wings gradually developing externally throughout the nymphal stages.

<span class="mw-page-title-main">Elcanidae</span> Extinct family of cricket-like animals

Elcanidae are an extinct family of Mesozoic and early Cenozoic orthopterans. Members of the family are distinguished by the presence of spurs on the distal part of the metatibia, unique among orthopterans, these have been suggested to have been used for controlling gliding, swimming aids, or for jumping on water. The group combines characteristics from both major groups of orthopterans, with long antennae and nymphal morphology similar to Ensifera, but with wing venation and adult morphology more similar to Caelifera. Elcanidae is part of Elcanoidea, which is thought to have diverged from living orthopterans by the beginning of the Permian, around 300 million years ago. The family also includes Permelcanidae, known from the Early-Late Permian. The relationship of Elcanoidea to Ensifera and Caelifera is currently unresolved. Elcanids are known from the Late Triassic to Paleocene of Eurasia, North and South America. Some members of the group exhibited aposematic coloration.

<i>Clatrotitan</i> Extinct species of winged insect

Clatrotitan is an extinct genus of titanopteran insect, known from the Triassic of Australia. It is originally described from a species, C. andersoni, then later study considered that Mesotitan scullyi as species of Clatrotitan too. But another study synonymized Mesotitan and Clatrotitan. A study in 2021 proposed to keep the two genera Clatrotitan and Mesotitan separated. C. andersoni had a large forewing, which was 13.8 centimetres (5.4 in) long.

Geinitziidae is an extinct family of polyneopteran insects, known from the Permian to Cretaceous. They are currently considered to be members "Grylloblattida" a poorly defined group of extinct insects thought to be related to modern ice crawlers (Grylloblattidae). Other authors place them in the extinct order Reculida. Unlike modern ice crawlers, which are wingless, they had large wings, bearing a superficial resemblance to cockroaches, and are thought to have been day-active above ground predators.

References

  1. 1 2 3 4 Schubnel, Thomas; Legendre, Frédéric; Roques, Patrick; Garrouste, Romain; Cornette, Raphaël; Perreau, Michel; Perreau, Naïl; Desutter-Grandcolas, Laure; Nel, André (2021-07-08). "Sound vs. light: wing-based communication in Carboniferous insects". Communications Biology. 4 (1): 794. doi:10.1038/s42003-021-02281-0. ISSN   2399-3642. PMC   8266802 . PMID   34239029. S2CID   235777698.
  2. 1 2 Béthoux, O. (2007). "Cladotypic Taxonomy Applied: Titanopterans are Orthopterans". Arthropod Systematics & Phylogeny. 65 (2): 135–156. ISSN   1863-7221. S2CID   8775265.
  3. Voigt, Sebastian; Spindler, Frederik; Fischer, Jan; Kogan, Ilja; Buchwitz, Michael (2007-09-26). "An extraordinary lake basin – the Madygen fossil lagerstaette (Middle to Upper Triassic, Kyrgyzstan, Central Asia)". Jahrestagung der Paläontologischen Gesellschaft. 36.
  4. Gorochov, A.V. (2007). "The first representative of the suborder Mesotitanina from the Paleozoic and notes on the system and evolution of the order Titanoptera (Insecta: Polyneoptera)". Paleontological Journal. 41 (6): 621–625. doi:10.1134/S0031030107060056. ISSN   1555-6174. S2CID   85364942.
  5. Park, Tae-Yoon S.; Kim, Do-Yoon; Nam, Gi-Soo; Lee, Mirinae (2022-05-06). "A new titanopteran Magnatitan jongheoni n. gen. n. sp. from southwestern Korean Peninsula". Journal of Paleontology. 96 (5): 1111–1118. doi: 10.1017/jpa.2022.30 . ISSN   0022-3360. S2CID   248592776.
  6. Grimaldi, D. (2009). "Fossil Record". In Resh, V.H.; Cardé, R.T. (eds.). Encyclopedia of Insects (2nd ed.). Cambridge: Academic Press. pp. 396–403. doi:10.1016/B978-0-12-374144-8.00114-4. ISBN   978-0-12-374144-8.
  7. Bethoux, O.; Galtier, J.; Nel, A. (2007). "Earliest Evidence of Insect Endophytic Oviposition". PALAIOS. 19 (4): 408–413. doi:10.1669/0883-1351(2004)019<0408:EEOIEO>2.0.CO;2. S2CID   85950015.