title: Investigation of the midgut structure and ultrastructure in Cimex lectularius and Cimex pipistrelli (Hemiptera: Cimicidae).
abstract: Cimicidae are temporary ectoparasites, which means that they cannot obtain food continuously. Both Cimex species examined here, Cimex lectularius (Linnaeus 1758) and Cimex pipistrelli (Jenyns 1839), can feed on a non-natal host, C. lectularius from humans on bats, C. pipistrelli on humans, but never naturally. The midgut of C. lectularius and C. pipistrelli is composed of three distinct regions-the anterior midgut (AMG), which has a sack-like shape, the long tube-shaped middle midgut (MMG), and the posterior midgut (PMG). The different ultrastructures of the AMG, MMG, and PMG in both of the species examined suggest that these regions must fulfill different functions in the digestive system. Ultrastructural analysis showed that the AMG fulfills the role of storing food and synthesizing and secreting enzymes, while the MMG is the main organ for the synthesis of enzymes, secretion, and the storage of the reserve material. Additionally, both regions, the AMG and MMG, are involved in water absorption in the digestive system of both Cimex species. The PMG is the part of the midgut in which spherites accumulate. The results of our studies confirm the suggestion of former authors that the structure of the digestive tract of insects is not attributed solely to diet but to the basic adaptation of an ancestor.
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland. magdalena.rost-roszkowska@us.edu.pl.
authors.forename: M M
authors.initials: MM
authors.lastname: Rost-Roszkowska
authors.affiliation: Faculty of Science, Dept of Zoology, Charles Univ, Praha 1, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Vilimova
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Włodarczyk
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland.
authors.forename: L
authors.initials: L
authors.lastname: Sonakowska
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Kamińska
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland.
authors.forename: F
authors.initials: F
authors.lastname: Kaszuba
authors.affiliation: Dept of Animal Histology and Embryology, Univ of Silesia, Bankowa 9, 40-007, Katowice, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Marchewka
authors.affiliation: Faculty of Science, Dept of Zoology, Charles Univ, Praha 1, Czech Republic.
authors.forename: D
authors.initials: D
authors.lastname: Sadílek
mesh_terms: D000818:Animals; D001511:Bedbugs / Q000033:anatomy & histology*; D002685:Chiroptera; D004032:Diet; D004064:Digestive System / Q000033:anatomy & histology*; D005247:Feeding Behavior; D006801:Humans
keywords: Midgut epithelium; alimentary tract; digestive cells; secretory cells