Morphology of the male reproductive system and spermiogenesis in Hypanthidium foveolatum (Alfken, 1930) (Hymenoptera: Apidae: Megachilinae)

Gracielle, I.M.S.; Fiorillo, Bruno Silva; Lino‐Neto, José; Báo, Sônia Nair

doi:10.1016/j.micron.2009.02.003

Cited by 21 publications

(27 citation statements)

References 37 publications

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“…In Scelionidae, only one mitochondrial derivative was observed, extending to the anterior extremity of the nucleus (Lino-Neto and Dolder, 2001a). The termination of the mitochondrial derivatives in the final portion of the flagellum in D. connubialis is similar to that observed in most Aculeata Apidae (Zama et al, 2001(Zama et al, , 2004(Zama et al, , 2005aFiorillo et al, 2005Fiorillo et al, , 2009Gracielle et al, 2009), Sphecidae (Zama et al, 2005b) and Vespidae (Mancini et al, 2006(Mancini et al, , 2009, in which one mitochondrial derivative terminates before the other, but differs from P. nasuta, in which the two mitochondrial derivatives terminate together (Oliveira et al, 2010).…”

Section: Discussionsupporting

confidence: 76%

“…However, alterations in chromatin compaction are evident in some species of Aculeata, including P. nasuta, in which chromatin in the nuclear periphery appears to be loose (Oliveira et al, 2010). In some Apidae the chromatin is decompressed throughout the nuclear area (Zama et al, 2004;Fiorillo et al, 2005;Gracielle et al, 2009). In Formicidae (Lino-Neto and Dolder, 2002;Moya et al, 2007) and other bee species, including Dialictus spp.…”

Section: Discussionmentioning

confidence: 99%

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Morphology of spermatozoa of Dissomphalus connubialis (Ashmead, 1893) (Hymenoptera: Bethylidae)

Oliveira

Fraga

Brito

et al. 2013

Micron

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In this study, the morphology of spermatozoa of Bethylidae Dissomphalus connubialis (Pristocerinae) was analyzed using light and transmission electron microscopy. Spermatozoa of this species are thin, measure approximately 130 μm in length and comprise a head region and flagellum region. The head is formed by the acrosome and nucleus. The acrosome consists of the acrosome vesicle and the perforatorium, the posterior portion of which is inserted into a cavity at the anterior extremity of the nucleus. The nucleus is compact, electron-dense and measures 15 μm in length. The flagellum possesses two mitochondrial derivatives, two accessory bodies and one axoneme with a 9+9+2 microtubular pattern. The nucleus is connected to the flagellum by the centriole adjunct. Mitochondrial derivatives are compact, apparently without paracrystalline material and with rare mitochondrial cristae. They are asymmetric in length, such that the larger mitochondrial derivative begins parallel to the posterior region of the nucleus and the smaller mitochondrial derivative begins just below the centriole adjunct. The basic structure of spermatozoa of D. connubialis is similar to that of other Aculeata studied. However, this species shows characteristics not seen in other Hymenoptera, such as the wide electron-lucid region that separates the acrosomal vesicle from the perforatorium and the depth of the cavity in the anterior extremity of the nucleus, into which the base of the perforatorium is inserted. There are also characteristics that distinguish this species from Bethylidae Prorops nasuta, including the fact that one of the mitochondrial derivatives lies to parallel to the nucleus over a long distance, the small quantity of cristae, the absence of paracrystalline material in these organelles, and the fact that the accessory microtubules are the first to terminate in the final portion of the flagellum.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Morphology of spermatozoa of Dissomphalus connubialis (Ashmead, 1893) (Hymenoptera: Bethylidae)

Oliveira

Fraga

Brito

et al. 2013

Micron

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“…The general structure of the V. velutina male tract is similar to that of other hymenopterans, and it is known that the testicular follicles number per testis varies significantly among species. The basal Apidae, for example, can have 3 (Mellitinae and Apidae s. stricto ; Roig‐Alsina et al ., ) to 28 tubules ( H. foveolatum ; Genissel et al ., ), while Apis mellifera can have 250 tubules (Chapman, ). In 3 parasitoids wasps of the Chalcidoidea family, Fiorillo et al .…”

Section: Discussionmentioning

confidence: 99%

Delayed sexual maturity in males ofVespa velutina

et al. 2017

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Vespa velutina var nigrithorax (Lepelletier, 1835) is an invasive predator of bees accidentally introduced in France in 2004, and it is having a serious impact on apiculture and ecosystems. Studying the reproduction of an invasive species is key to assess its population dynamic. This study explores the sexual maturation of V. velutina males and the evolution of their fertility. The main studied parameters were physiologic (spermiogenesis, spermatogenesis) and anatomic (testes size and structure, head width). Two populations of males were described based on their emergence period: early males in early summer or classic males in autumn. Each testis has an average of 108 testicular follicles. Spermatogenesis is synchronous, with only 1 sperm production wave, and completed, on average, at 10.3 d after emergence with the degeneration of the testes. The sperm counts in seminal vesicles of mature males are 3 × 10 in October/November and 0.8 × 10 in June. In comparison, females store 0.1 × 10 sperm in their spermathecae. The early males emerged from colonies made by fertilized queens. The reproductive potential of these early males seemed limited, and their function in the colony is discussed. The sperm stock evolution in autumn males suggests the occurrence of a reproductive pattern of male competition for the access to females and a single copulation per male. The synchronicity of male and foundress emergences and sexual maturation is of primary importance for the mating success and the future colony development.

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“…The number of follicles per testis, for example, may vary considerably. In Aculeata Apidae, some bees subfamilies, such as Colletinae, Halictinae and Andreninae, and some members of the Megachilinae have three follicles per testis (Ferreira et al, 2004), while the majority of Apinae, Mellitinae, and Megachilinae have four follicles per testis (Araú jo et al, 2005b;Ferreira et al, 2004;Roig-Alsina and Michener, 1993), with the exception of Apis mellifera, which has 250 follicles (Chapman, 1998), and Hypanthidium foveolatum, which has 28 follicles (Gracielle et al, 2009). In Formicidae, the number of follicles ranges from 1 to 25 (Wheeler and Krutzsch, 1992).…”

Section: Discussionmentioning

confidence: 99%

Morphological aspects of testes and sperm ultrastructure in the “symphyta” Digelasinus diversipes kirby 1882 (hymenoptera: Argidae: Dielocerinae)

Moreira

Araújo

Lino‐Neto

2011

Microscopy Res & Technique

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In Digelasinus diversipes, spermatozoa are maintained in bundles, with 74 spermatozoa on average, in the seminal vesicle. These spermatozoa are very short (20 μm) and consist of a head and flagellum. The head includes an acrosome (perforatorium covered by the acrosomal vesicle) and a nucleus. A regular electron-lucent region separates the acrosomal vesicle from the perforatorium, which is inserted parallel to the anterior ending of the nucleus. The small flagellum is composed of two symmetrical mitochondrial derivatives, a centriolar adjunct, an axoneme (9 + 9 + 2), and two accessory bodies. The centriolar adjunct begins above the posterior end of the nucleus and ends covering the anterior tip of two mitochondrial derivatives. In the terminal region of the axoneme, the central microtubules terminate first. The presence of a subacrosomal space, a short mitochondrial derivative diameter, and a short spermatodesm is the ultrastructure characteristics of spermatozoa shared by all "symphyta" species. Differences in the insertion of the perforatorium into the nucleus and the position of the centriolar adjunct distinguish Dielocerinae and the Arginae studied previously. The number of spermatozoa per cyst is variable. Furthermore, additional characteristics that had not been described for "symphyta" were also found, such as the number of follicles per testis.

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Morphology of the male reproductive system and spermiogenesis in Hypanthidium foveolatum (Alfken, 1930) (Hymenoptera: Apidae: Megachilinae)

Cited by 21 publications

References 37 publications

Morphology of spermatozoa of Dissomphalus connubialis (Ashmead, 1893) (Hymenoptera: Bethylidae)

Morphology of spermatozoa of Dissomphalus connubialis (Ashmead, 1893) (Hymenoptera: Bethylidae)

Delayed sexual maturity in males ofVespa velutina

Morphological aspects of testes and sperm ultrastructure in the “symphyta” Digelasinus diversipes kirby 1882 (hymenoptera: Argidae: Dielocerinae)

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