Morphological studies on the Triatoma brasiliensis Nieva, 1911 (Hemiptera, Reduviidae, Triatominae) genital structures and eggs of different chromatic forms

被引:55
作者
Costa, J
Barth, OM
MarchonSilva, V
deAlmeida, CE
FreitasSibajev, MGR
Panzera, F
机构
[1] INST OSWALDO CRUZ,DEPT VIROL,LAB ULTRAESTRUTURA VIROL,BR-21045900 RIO JANEIRO,BRAZIL
[2] INST OSWALDO CRUZ,DEPT BIOQUIM & BIOL MOL,LAB SISTEMAT BIOQUIM,BR-21045900 RIO JANEIRO,BRAZIL
[3] UNIV MONTEVIDEU,SOCIEDADE BARRAMANSENSE ENSINO SUPER,DEPT ECOL,MONTEVIDEO,URUGUAY
[4] UNIV MONTEVIDEU,FAC CIENCIAS,SECAO GENET EVOLUT,MONTEVIDEO,URUGUAY
来源
MEMORIAS DO INSTITUTO OSWALDO CRUZ | 1997年 / 92卷 / 04期
关键词
Triatoma brasiliensis; populations; morphology; external genital structures; eggs;
D O I
10.1590/S0074-02761997000400009
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
Triatoma brasiliensis is considered one of the most important Chagas disease vectors being a widespread species in semiarid areas of northeastern Brazil. The species displays distinct chromatic patterns of the cuticle in different localities. Four populations were analyzed in this study: 1-Caico, Rio Grande do Norte, it will be called the brasiliensis population; 2-Espinosa, Minas Gerais, the melanica population, 3-Petrolina, Pernambuco, the macromelasoma population, and 4-Juazeiro , Bahia, the darker one in overall cuticle coloration, the Juazeiro population. In order to differentiate the four populations of T. brasiliensis, a comparative morphological analysis of external genital structures and of eggs were carried out. The analysis of the male genital structures evidenced minor individual structural variations that did not correlate with chromatic differences or the geographical origins, emphasizing the importance of examining sufficiently large and representative samples before using minor genital variations for taxonomic diagnosis. By scanning electron microscopy of the egg exochorion, each chromatic population presented a distinct ornamentation pattern. The melanica population differed mainly from the other populations studied since it had about 40.6%, 69.6% and 76.6% more perforations, on each cell exochorion, than the brasiliensis, the Juazeiro and the macromelasoma populations respectively. in the melanica population the perforation layout is also peculiar, with densely distributed perforations over all the egg surface. Morphometric measures of the eggs showed statistically significant differences: the macromelasoma population presented the longest length (2.43 mm) while the shortest was recorded in the brasiliensis population (2.29 mm).
引用
收藏
页码:493 / 498
页数:6
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