Sperm Transfer in Glyptholaspis Americana

Krantz, G. W.; Wernz, J. G.

doi:10.1016/b978-0-12-592202-9.50062-8

Cited by 19 publications

(10 citation statements)

References 4 publications

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“…Males were able to assess the value of their mates according to the age and reproductive status of the latter (Yasui 1996 ). Krantz and Wernz ( 1979 ) studied the mechanism of sperm transfer and various aspects of pre-mating and mating behavior in G. americana . They observed that the oozing sperm droplet is taken up by one of the male chelicerae, which then remain closely appressed to each other throughout the transfer process, allowing uninterrupted sperm fl ow from the droplet to the spermadactyl of the opposing chelicera, which ultimately does the actual insemination.…”

Section: Reproductionmentioning

confidence: 99%

Macrochelid Mites (Mesostigmata: Macrochelidae) as Biological Control Agents

Azevedo

Emberson

Esteca

et al. 2015

Prospects for Biological Control of Plant Feeding Mites and Other Harmful Organisms

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Section: Reproductionmentioning

confidence: 99%

Macrochelid Mites (Mesostigmata: Macrochelidae) as Biological Control Agents

Azevedo

Emberson

Esteca

et al. 2015

Prospects for Biological Control of Plant Feeding Mites and Other Harmful Organisms

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“…The spermatodactyl had been reported as having a canal (sperm transfer tube) that extends along its length (Young, 1959(Young, , 1968bKrantz and Wernz, 1979;Evans, 1992), even in some Veigaia species (Błaszak and Ehrnsberger, 2001). However, these studies used light microscopy, so the entire path of the sperm transfer tube was difficult to discern to its proximal opening.…”

Section: Discussionmentioning

confidence: 99%

“…For the macrochelid Glyptholaspis americana, Krantz and Wernz (1979) suggested a sequence of events starting with the acceptance of a formed spermatophore by one chelicera. By means of an intercheliceral transfer, the sperm fluid moves to the sperm transfer tube of the opposite spermatodactyl.…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that spermatophores of Dermanyssina are transferred to the solenostomes (i.e., the copulatory pores) by means of the spermatodactyl (see Alberti and Coons, 1999, and references therein). A single earlier work deals with the functional morphology of these structures (Krantz and Wernz, 1979), but ultrastructural information on the spermatodactyl is entirely lacking. Moreover, even though the general pattern of gnathosomal structures in gamasids has been clarified (see Evans, 1992;Alberti and Coons, 1999, and ref-erences therein), the morphological and ultrastructural adaptations of Veigaia are undescribed.…”

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confidence: 99%

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Fine structure and functional morphology of the mouthparts of a maleVeigaia sp. (Gamasida: Veigaiidae) with remarks on the spermatodactyl and related sensory structures

et al. 2006

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Mites of the genus Veigaia are common gamasid inhabitants of forest litter. They engage in the peculiar reproductive strategy of podospermy which, along with other morphological and behavioral adaptations, involves modification of the chelicerae of the relatively rare males into gonopods. Each movable digit is provided with an appendage (spermatodactyl) that is involved in sperm transfer. We describe the gross anatomy, fine structure, and functional morphology of the mouthparts of a male Veigaia species and give ultrastructural details for the corniculi, laciniae, preoral cavity, labrum, pharynx, and movable and fixed digits. The fine structure of the spermatodactyl is illustrated here for the first time in detail. A semischematic reconstruction of the gnathosoma and spermatodactyl is provided. The spermatodactyl is totally fused with the movable digit and a sperm transfer duct runs along its entire length. This duct starts at the adaxial base of the movable digit, continues inside the digit into the tube of the spermatodactyl, and finally opens at the distal abaxial surface of the spermatodactyl. Several sensory structures associated with the spermatodactyl probably provide the male with mechanical and chemical clues.

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“…The male injects sperm into her sperm-induction pore that opens onto the posterior surface of each coxa HI using the spermatodactyl, syringe-like apparatus in his mouthparts (Krantz and Wernz, 1979). One central sacculus foemineus is connected to two sperm-induction pores by two fine, long cuticle-lined ducts, tubuli annulati.…”

Section: The Mechanisms Of ~Perm Precedencementioning

confidence: 99%

Adaptive control of copulation duration by males under sperm competition in the mite, Macrocheles muscaedomesticae

Yasui

1994

Exp Appl Acarol

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Yasui, Y., 1994. Adaptive control of copulation duration by males under sperm competition in the mite, Macrocheles muscaedomesticae. Exp. Appl. Acarol., In a manure-inhabiting predator)' mite, Macrocheles muscaedomesticae (Gamasida, Macrochelidae), when the female mates with two males, the first male takes nearly perfect fertilization priority (Yasui, 1988). The present study examined whether the first-male's sperm precedence is influenced by the copula-duration of the first and second males mating with the same female, and whether males control their copulation duration by assessing the probability that the mate has been inseminated by other males. Results ot the artificial interruption of copulation showed that sperm precedence value, P2 (the proportion of the offspring lathered by the second male), was negatively correlated with the copulation duration of the first male but positively correlated with that of the second male. There was a threshold (ca. 180-300 seconds) in the first-male' s copulation duration beyond which P2 decreased drastically; when length of the first copulation exceeded this threshold, the second males did not fertilize eggs, whereas they fertilized more than half of the eggs when the first-copulation duration was shorter than the threshold. Almost all males copulated for a longer period (average 509.8 seconds) than this threshold if the copulation duration of the previous male had not exceeded the threshold, but if it was longer than the threshold, second males had shortened their copulation (67.6 seconds). These results suggest that males are able to assess the insemination status of their mates and to .adjust their copulation duration depending on the probability of fertilizing eggs by their own sperm. A mechanistic explanation for sperm precedence (i.e., plug-Ibrmation within sperm receptive organ of the females) is propo~d.

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Sperm Transfer in Glyptholaspis Americana

Cited by 19 publications

References 4 publications

Macrochelid Mites (Mesostigmata: Macrochelidae) as Biological Control Agents

Macrochelid Mites (Mesostigmata: Macrochelidae) as Biological Control Agents

Fine structure and functional morphology of the mouthparts of a maleVeigaia sp. (Gamasida: Veigaiidae) with remarks on the spermatodactyl and related sensory structures

Adaptive control of copulation duration by males under sperm competition in the mite, Macrocheles muscaedomesticae

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