Untersuchungen über den copulationsapparat der baumwanzen

Ludwig, Wilhelm

doi:10.1007/bf00408030

Cited by 47 publications

(39 citation statements)

References 10 publications

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“…There are few studies on the morphology of the genital organs of lygaeid bugs (Ekblom, 1926;Ludwig, 1926;Bonhag & Wick, 1953;Pendergrast, 1957;Kahlov, 1962;Micholitsch, 1997). These investigations were mainly done by light-microscopy.…”

Section: Introductionmentioning

confidence: 99%

Functional anatomy of the spermatheca and its duct in the seed bug Lygaeus simulans (Heteroptera: Lygaeidae)

Gschwentner¹,

Tadler²

2000

Eur. J. Entomol.

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Abstract. Female genitalia of lygaeid bugs are characterized by a tube-shaped ductus receptaculi (spermathecal duct) connecting the bursa copulatrix with the highly coiled receptaculum seminis (spermatheca). In this study the morphology and functional anatomy of these structures in Lygaeus simulans were examined by light-, fluorescence-and electron microscopy. In addition, copulating ani mals were freeze fixed and their interconnected genital structures observed using light microscopy. The ductus receptaculi is sepa rated from the receptaculum seminis by a complicated valve. The valve is nearly surrounded by the spermathecal muscle, which controls its opening. The ductus receptaculi leads into the proximal convoluted tube of the receptaculum seminis. Both the ductus receptaculi and the convoluted tube are composed of a single layer of epithelial cells lined by a thick electron dense apical cuticle. The distal part of the receptaculum seminis is a brownish, irregularly coiled, blind ending canal made of small epithelial cells cov ered with cuticle. Big glands are present in the epidermal layer. The cuticle of this distal part is much thinner and features concentric lamellae. The lumen of the receptaculum seminis cannot be expanded. For transfering sperm into the receptaculum the male aedeagus is equipped with a long, tube-like, sclerotized appendix (processus gonopori), which enlarges the ductus receptaculi con siderably during copulation. For successful insemination the tip of the processus gonopori has to pass the valve. The convoluted tube, the valve and the surrounding spermathecal muscle may enable females to control insemination and egg fertilization.

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Section: Introductionmentioning

confidence: 99%

Functional anatomy of the spermatheca and its duct in the seed bug Lygaeus simulans (Heteroptera: Lygaeidae)

Gschwentner¹,

Tadler²

2000

Eur. J. Entomol.

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“…The aedeagus can be moved by hydraulic pressure but the processus lacks both hydraulic structures and sensory organs (Ludwig 1926;Bonhag & Wick 1953). Its length is probably of importance in two situations.…”

Section: Selection Of a Genitalic Trait A Tadler 1775mentioning

confidence: 99%

“…Its length is probably of importance in two situations. First, in order to insert the processus into the ductus receptaculi the male has to rotate the aedeagus within the female bursa copulatrix, so that the tip of the processus slips into the proximal opening of the ductus (see Ludwig (1926) for a detailed description of these manoeuvres). The tip could thereby fail to enter the opening of the ductus if the length of the processus is not appropriate.…”

Section: Selection Of a Genitalic Trait A Tadler 1775mentioning

confidence: 99%

“…There is no particular courtship behaviour prior to copulation, only a brief precopulatory struggle where the male grasps the female dorsally with his legs and tries to insert his aedeagus into the female bursa copulatrix (Ludwig 1926;Sille¨n-Tullberg 1981;Tadler et al 1999). When this has been achieved the male performs complicated genitalic manoeuvres in order to introduce the processus gonopori into the female ductus receptaculi (Ludwig 1926). For successful insemination the tip of the processus has to penetrate the valvelike structure between the ductus and receptaculum and must be inserted into the proximal part of the receptaculum (¢gure 1a).…”

Section: Introductionmentioning

confidence: 99%

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Selection of a conspicuous male genitalic trait in the seedbug Lygaeus simulans

Tadler

1999

Proc. R. Soc. Lond. B

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Phenotypic selection of a male genitalic trait based on insemination success in the seedbug Lygaeus simulans, Deckert 1985, was demonstrated in this study. In a laboratory experiment, 97 pairs of virgin animals copulated once. The females consisted of six groups of full sisters, all sisters of a group having been raised in the same box. Related females were used in order to lower the variance of female preferences and to thereby increase the chances of detecting selection of male traits by female choice. The males were independent, i.e. each male descended from a unique pair of parents. Multiple regressions of insemination success on linear and nonlinear terms of a male genitalic trait (processus gonopori length) and male weight revealed stabilizing selection on the genitalic trait. According to functional considerations this selection is most probably the result of female choice of male processus length.

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“…Works on other Heteroptera were also consulted as many of them are of general significance: Kullenberg (1947); (Bonhag & Wick (1953); Carvalho & Southwood (1955) ; Gross (1965)); Kahlow (1962); Freeman (1947) and Ludwig (1926).…”

Section: Morphology Of the Male Genitalia Of Oxycarenusmentioning

confidence: 99%

A revision of the African species of Oxycarenus (Hemiptera: Lygaeidae)

Samy¹

1969

Transactions of the Royal Entomological Society of London

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The thesis contains uniform redescriptions of 36 African species of Oxycarenus including 15 species described as new. Figures are presented of each species in a way as to facilitate easy recognition; particular emphasis has been placed on the male genitalia, since they appear to provide significant taxonomic features.Earlier workers based the identification of the members of this group entirely on the colour pattern. In the present work coloration was also found to be indispensable especially in the closely related species, where attention is drawn to the fine and subtle colour differences. However, the use of colour pattern is supplemented by other morphological characters.The importance of the male genitalia as a major taxonomic character is revealed. The study has also indicated that the genus Oxycarenus seems to include three separable groups each apparently deserving subgeneric rank. The recognition characters of these subgenera, as well as keys to them and to the species within each subgenus are given.The study also involved a genetic investigation on one polymorphic new species, Oxycarenus multiformis, whose colour forms were previously confused with other species. Holotypes were examined whenever possible; in cases where these are known to have been lost or destroyed neotypes have been designated.Body measurements were made on dried pinned specimens using a binocular microscope with a micrometer eyepiece. Whenever material was available, five specimens of each sex were measured. With some species sets of measurements were made on individuals from different localities. The lengths of the head, pronotum and scutellum were determined dorsally along the median line.The width of head was taken across the compound eyes including their diameter,The width of pronotum was that of its broadest part.All drawings were made to scale, using a square graticule fitted into the eyepiece of a stereoscopic binocular microscope, from dried pinned specimens. Those of the genitalia and other parts separately illustrated, were made from dissected, unmounted parts of the body held in a cavity slide The detailed studies of the genitalia were initially based on a study of freshly killed material. Copulating pairs were instantly killed in boiling water, the posterior half of their abdomens were detached and treated in warm 10% potassium hydroxide. The sexes were then separated by carefully pulling them apart. However, the majority of the species studied were available only as dried, pinned material. In that case the pygophore was carefully removed from the body and softened in hot water for 10 minutes, then it was transferred to warm 10% potassium hydroxide; the solution was repeatedly changed until muscles had cleared.It was found that the aedeagus could not be satisfactorily inflated by alternate use of 10% potassium hydroxide and distilled water as suggested by Ashlock (1957) and Ahmed (1965). Thus careful dissection by hand was found to be inevitable, although parts of the aedeagus were sometimes damaged.The method ...

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Untersuchungen über den copulationsapparat der baumwanzen

Cited by 47 publications

References 10 publications

Functional anatomy of the spermatheca and its duct in the seed bug Lygaeus simulans (Heteroptera: Lygaeidae)

Functional anatomy of the spermatheca and its duct in the seed bug Lygaeus simulans (Heteroptera: Lygaeidae)

Selection of a conspicuous male genitalic trait in the seedbug Lygaeus simulans

A revision of the African species of Oxycarenus (Hemiptera: Lygaeidae)

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