A vinculum is a horizontal line used in mathematical notation for various purposes. It may be placed as an overline over a mathematical expression to indicate that the expression is to be considered grouped together. Historically, vincula were extensively used to group items together, especially in written mathematics, but in modern mathematics this function has almost entirely been replaced by the use of parentheses. It was also used to mark Roman numerals whose values are multiplied by 1,000. Today, however, the common usage of a vinculum to indicate the repetend of a repeating decimal is a significant exception and reflects the original usage.
Ptichodis is a genus of moths in the family Erebidae. The genus was erected by Jacob Hübner in 1818.
Pseudopostega attenuata is a moth of the family Opostegidae. It is probably a rather widespread species in the South American lowland tropics. The species is known from Costa Rica, north-western Brazil and south-western Ecuador.
Pseudopostega concava is a moth of the family Opostegidae. It was described by Donald R. Davis and Jonas R. Stonis, 2007. It is known from a seasonally dry forest area in northeastern Mexico.
Pseudopostega sectila is a moth of the family Opostegidae. It was described by Donald R. Davis and Jonas R. Stonis, 2007. It is known from Puerto Rico and Tortola in the British Virgin Islands.
Eriocraniella mediabulla is a moth of the family Eriocraniidae. It was described by Davis and Faeth in 1986. It is found in northern Georgia, northern Florida, southern Louisiana, north-eastern Texas, and North Carolina.
Ptichodis bistriga is a moth of the family Erebidae first described by Gottlieb August Wilhelm Herrich-Schäffer in 1869. It is found on Cuba.
Ptichodis herbarum, the common ptichodis moth, is a moth in the family Erebidae. It is found in the United States. It has also been recorded from Jamaica.
The Euclidiini are a tribe of moths in the family Erebidae. The tribe was erected by Achille Guenée in 1852.
Ptichodis agrapta is a moth of the family Erebidae. It is found on Guyana.
Ptichodis bistrigata, the southern ptichodis moth, is a moth of the family Erebidae. It is found in North America, where it has been recorded from Texas to Florida, north to Massachusetts and west to Wisconsin.
Ptichodis immunis is a moth of the family Erebidae. It is found in Mexico, Belize, Costa Rica, Ecuador, Suriname, French Guiana, Venezuela, Brazil, Barbados, Cuba, Martinique, Guadeloupe, St. Kitts, Antigua and Barbuda, Hispaniola, St. Vincent, Grenada, Puerto Rico, Jamaica, the Virgin Islands, as well as in the United States, where it has been recorded from Georgia, Florida and Texas.
Ptichodis basilans is a moth of the family Erebidae. It is found in Honduras, French Guiana, Venezuela, Brazil and Paraguay.
Ptichodis bucetum is a moth of the family Erebidae. It is found in North America, where it has been recorded from Arizona, New Mexico and Utah.
Ptichodis fasciata is a moth of the family Erebidae first described by E. Dukinfield Jones in 1921. It is found in Paraná, Brazil.
Ptichodis infecta is a moth of the family Erebidae. It is found on Hispaniola, where it has been recorded from Haiti and the Dominican Republic.
Ptichodis ovalis is a moth of the family Erebidae. It is found in Mexico (Oaxaca) and the United States, where it has been recorded from Arizona, New Mexico and Texas.
Ptichodis pacalis is a moth of the family Erebidae. It is found in North America, where it has been recorded from Florida and Georgia.
Semioptila vinculum is a moth in the Himantopteridae family. Semioptila vinculum was described by Erich Martin Hering in 1937. It is found West Kasai in the Democratic Republic of the Congo.
Steniini is a tribe of the species-rich subfamily Spilomelinae in the pyraloid moth family Crambidae. The tribe was erected by Achille Guenée in 1854.
