Estudos sobre Triatomideos do Chile: interessante caso de provavel polimorfismo

Neiva, Arthur; Lent, Herman

doi:10.1590/s0074-02761940000200007

Cited by 3 publications

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“…Females of both species are invariably wingless (micropterous). Males of M. gajardoi are always winged (brachypterous), whereas males of M. spinolai may be winged (macropterous, brachypterous) or wingless (micropterous) (Mazza et al 1940, Neiva & Lent 1940, Lent & Jurberg 1967. Reciprocal crossbreeding experiments showed that the two species are reproductively isolated (Frías et al 1998).…”

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A new species and karyotype variation in the bordering distribution of Mepraia spinolai (Porter) and Mepraia gajardoi Frías et al (Hemiptera: Reduviidae: Triatominae) in chile and its parapatric model of speciation

Frías-Lasserre¹

2010

Neotrop. entomol.

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-In the present study, the morphology, color pattern, chromosomal complement and aspects of meiosis in natural populations at the borders of the distributions of Mepraia gajardoi Frías et al and Mepraia spinolai (Porter) are described. The males of these bordering populations are brachypterous or macropterous, while females are always micropterous. Morphological and cytogenetic data indicated that the populations that border the distributions of M. gajardoi and M. spinolai, belong to a different species of parapatric origin. (Sagua et al 2000, Canals et al 2001, Carvajal et al 2007, Botto-Mahan et al 2008. This disease is important in the Neotropical region with nearly 16 million people infected, and another 90 million at risk of contracting the disease, especially in rural areas (Schofi eld et al 1982, Schofi eld 1994.Mepraia gajardoi differs from M. spinolai in body color, morphology, genitalia and karyotype. Females of both species are invariably wingless (micropterous). Males of M. gajardoi are always winged (brachypterous), whereas males of M. spinolai may be winged (macropterous, brachypterous) or wingless (micropterous) (Mazza et al 1940, Neiva & Lent 1940, Lent & Jurberg 1967. Reciprocal crossbreeding experiments showed that the two species are reproductively isolated (Frías et al 1998).The karyotypes of both species are formed by 20 autosomes and an X1 X2 Y sex system. However, males of M. gajardoi have a large Y chromosome, whereas those of M. spinolai are polymorphic for a small neo-Y chromosome, which may have originated by a fracture of the large holocentric Y chromosome of M. gajardoi (Frías & Atria 1998). Also, a particular heteropycnotic chromocenter, typical of M. spinolai, differentiates this species from M. gajardoi. It is formed by sex chromosomes surrounded by several autosomal heteropycnotic dots. Other heteropycnotic regions outside this chromocenter can also be observed (Frías & Atria 1998, Perez et al 2004 In the present study, I report the morphological traits of adults and the chromosomal complement of populations of Mepraia species bordering the distribution of M. gajardoi and M. spinolai, with a discussion of their mode of speciation. Material and MethodsPopulations studied. The specimens examined were collected during the summer of 1996 by D Frías and A Alviña, and during spring, in November 2002, by D Frías, from region III of Atacama and region II of Antofagasta (Fig 1). The former region is located in the Parque Nacional Pan

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A new species and karyotype variation in the bordering distribution of Mepraia spinolai (Porter) and Mepraia gajardoi Frías et al (Hemiptera: Reduviidae: Triatominae) in chile and its parapatric model of speciation

Frías-Lasserre¹

2010

Neotrop. entomol.

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“…Nevertheless, the genus Mepraia, comprising M. gajardoi, M. parapatrica, and M. spinolai , has a particular relevance as all these species have only been observed in Chile (Porter , Frias et al , Frias ). Neiva and Lent (), before the middle of the last century, considered this genus as monotypic and “Chilean triatomids of the highest interest.” The three species that have been found infected with T. cruzi in wild environments (Egãna et al ), show a conspicuous wing polymorphism: all females are micropterous, M. gajardoi males are brachipterous, M. parapatrica males are brachipterous or macropterous, and M. spinolai are brachipterous, macropterous, or micropterous (Frias , Frias‐Lasserre et al ). Given such inter‐ and intraspecific wing discrepancy in Mepraia , studies on their distribution are necessary to verify and evaluate these characters as well as to record new points of occurrence of the three species in Chile.…”

Section: Information On Collections Of Three Species Of Mepraia In Chmentioning

confidence: 99%

“…However, Mazza et al () established the species genus as Mepraia , describing its female and re‐describing its male. Usinger () described Triatoma chilena ; Neiva and Lent () suggested renaming Triatoma spinolai as Triatomaptera porteri . Lent and Wygodzinsky () regarded T. spinolai as a valid denomination and established as synonyms T. chilena Usinger, (); M. spinolai Mazza et al (); Triatomaptera porteri Neiva and Lent ().…”

Section: Information On Collections Of Three Species Of Mepraia In Chmentioning

confidence: 99%

“…Usinger () described Triatoma chilena ; Neiva and Lent () suggested renaming Triatoma spinolai as Triatomaptera porteri . Lent and Wygodzinsky () regarded T. spinolai as a valid denomination and established as synonyms T. chilena Usinger, (); M. spinolai Mazza et al (); Triatomaptera porteri Neiva and Lent (). Lent et al () revalidated the genus Mepraia .…”

Section: Information On Collections Of Three Species Of Mepraia In Chmentioning

confidence: 99%

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