Mastotermes

''Mastotermes'' is a genus of termites. The sole living species is ''Mastotermes darwiniensis'', found only in northern Australia. A number of extinct taxa are known from fossils. It is a very peculiar insect, the most primitive termite alive. As such, it shows notable similarities to cockroaches in the family Cryptocercidae, the termites' closest relatives. These similarities include the anal lobe of the wing and the laying of eggs in bunches, rather than singly. The termites were traditionally placed in the Exopterygota, but such an indiscriminate treatment makes that group a paraphyletic grade of basal neopterans. Thus, the cockroaches, termites and their relatives are nowadays placed in a clade called Dictyoptera.

These singular termites appear at first glance like a cockroaches abdomen with a termite's head and thorax. Their wings have the same design as those of the cockroaches, and its eggs are laid in a case as are cockroach eggs. It is thought to have evolved from the same ancestors as the wood roaches (''Cryptocercus'') in the Late Jurassic or Early Cretaceous. Fossil wings have been discovered in the Permian of Kansas which have a close resemblance to wings of ''Mastotermes'' of the Mastotermitidae, which is the most primitive living termite. This fossil species is '' Pycnoblattina''. It folded its wings in a convex pattern between segments 1a and 2a. ''Mastotermes darwiniensis'' is the only living insect that does the same. However, ''Pycnoblattina'' has been demonstrated to be unrelated to termites and the earliest termites are from the latest Jurassic-earliest Cretaceous. Unlike cockroaches, not all termites have wings: Only the reproductives, (see Termites-life cycle) whose wings are considerably longer than their abdomen. ''Mastotermes darwiniensis'' is usually not very numerous, nor are the colonies large when left to natural conditions. However, when given abundant water(such as regular irrigation) and favourable food & soil conditions (such as stored timber or timber structures), populations can be enormous, numbering in the millions, quickly destroying their host. Its diet is varied, as it will eat introduced plants, damage ivory and leather, and wood and debris, in fact almost anything organic. It becomes a major agricultural pest, to the extent that vegetable farming has been virtually abandoned in Northern Australia wherever this termite is numerous, which it is outside of the rain forest or bauxite soils. It has developed the ability to bore up into a living tree and ring bark it such that it dies and becomes the center of a colony.

''Mastotermes darwiniensis'' is the only known host of the symbiotic protozoan ''Mixotricha paradoxa'', remarkable for its multiple bacterial symbionts.

Fossil species

Numerous extinct taxa have been described in the genus ''Mastotermes''. The genus had a worldwide distribution until just a few million years ago, when all but the ''M. darwiniensis'' became extinct.

Fossil species of ''Mastotermes'' include:Krishna, K., D.A. Grimaldi, V. Krishna, & M.S. Engel (2013) Treatise on the Isoptera of the world. ''Bulletin of the American Museum of Natural History'' 377: 1-2704.
* ''Mastotermes aethiopicus'' Engel, Currano, & Jacobs, 2016 Ethiopia, Miocene
* '' Mastotermes anglicus'' Rosen, 1913 (Bembridge Marls, England, Priabonian
* '' Mastotermes bournemouthensis'' Rosen, 1913 (Late Eocene of England)
* '' Mastotermes croaticus'' Rosen, 1913 (Early Miocene of Croatia)
* '' Mastotermes electrodominicus'' Krishna & Grimaldi, 1991 (Early Miocene of the Dominican Republic)
* '' Mastotermes electromexicus'' Krishna & Emerson, 1983 (Late Oligocene to Early Miocene Mexican amber)
* '' Mastotermes gallica'' Nel, 1986 (Early Oligocene of France)
* '' Mastotermes haidingeri'' (Heer, 1849) (Early Miocene of Croatia)
* '' Mastotermes heerii'' (Göppert, 1855) (Late Oligocene of Poland) – tentatively placed in ''Mastotermes''
* '' Mastotermes krishnorum'' Wappler & Engel, 2006 (Middle Eocene of Germany)
* '' Mastotermes minor'' Pongrácz, 1928 (Early Miocene of Croatia)
* '' Mastotermes minutus'' Nel & Bourguet, 2006 (Eocene of France)
*''Mastotermes monostichus'' Zhao et al. 2019 Burmese amber, Myanmar, Cenomanian
*''Mastotermes nepropadyom'' Vršanský and Aristov 2014 Doronino Formation, Russia, Barremian
* '' Mastotermes picardi'' Nel & Paicheler, 1993 (Late Oligocene of France)
* '' Mastotermes sarthensis'' Schlüter, 1989 Bezonnais amber, France, Cenomanian
* '' Mastotermites stuttgartensis'' Armbruster, 1941 (Middle Miocene of Germany) – tentatively placed in ''Mastotermes''

References

Sources

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{{Taxonbar, from=Q6785606

Termites
Termite genera
Extant Cretaceous first appearances
Cretaceous genus first appearances
Insects of Australia