Sperm ultrastructure in Chironomoidea (Insecta, Diptera)

Dallai, Romano; Lombardo, Bianca Maria; Lupetti, Pietro

doi:10.1016/j.tice.2007.03.003

Cited by 7 publications

(8 citation statements)

References 30 publications

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“…Hermetia illucens share many features with other brachyceran subspecies as well as some nematoceran subspecies, confirming their close relationship as indicated (Dallai et al, 2007;Dallai et al, 2008). However, several structural differences were observed pertaining to the head region, zone of overlap, and anterior flagellar region.…”

Section: Discussionmentioning

confidence: 52%

“…However, several structural differences were observed pertaining to the head region, zone of overlap, and anterior flagellar region. The head region of Hermetia illucens presents with an apical nuclear region consistent with other brachycera (Degrugillier, 1985;Curtis et al, 1989;Name et al, 2010;Name et al, 2012) and some nematocera (Dallai et al, 1984;Dallai et al, 2007), but despite several sections viewed, the presence and structure of an acrosome could not be determined. Additionally, as observed in sperm derived from the spermathecae of Musca domestica (Degrugillier and Leopold, 1976;Degrugillier, 1985), a loosening or "wrinkled" plasma membrane surrounding the anterior head region was observed.…”

Section: Discussionmentioning

confidence: 88%

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The importance of insect sperm: Sperm ultrastructure of Hermetia illucens (black soldier fly)

et al. 2019

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Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 88%

The importance of insect sperm: Sperm ultrastructure of Hermetia illucens (black soldier fly)

et al. 2019

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“…; Dallai et al . ). Such a characteristic was even observed in some Ephemeroptera (Gaino and Mazzini ).…”

Section: Discussionmentioning

confidence: 97%

“…Insect species, from unrelated orders, have already been described without the central pair of microtubules (Dallai et al . ), lacking the outer dynein arms of the axoneme or having only one mitochondrion along the flagellum (Dallai and Afzelius ). This represents an exceptional example of convergent forces.…”

Section: Discussionmentioning

confidence: 99%

The sperm of Hexagenia (Pseudeatonica) albivitta Walker (Ephemeroptera: Fossoriae: Ephemeridae)

Brito¹,

Mancini

Salles

et al. 2014

Acta Zoologica

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Brito, P., Mancini,. K., Salles, F.F., Rizzi, E.A. and Dolder, H. 2015. The sperm of Hexagenia (Pseudeatonica) albivitta Walker (Ephemeroptera: Fossoriae: Ephemeridae). -Acta Zoologica (Stockholm) 96: 160-166.This study describes the sperm morphology of the mayfly Hexagenia (Pseudeatonica) albivitta (Ephemeroptera). Its spermatozoon measures approximately 30 lm of which 9 lm corresponds to the head. The head is composed of an approximately round acrosomal vesicle and a cylindrical nucleus. The nucleus has two concavities, one in the anterior tip, where the acrosomal vesicle is inserted and a deeper one at its base, where the flagellum components are inserted. The flagellum is composed of an axoneme, a mitochondrion and a dense rod adjacent to the mitochondrion. A centriolar adjunct is also observed surrounding the axoneme in the initial portion of the flagellum and extends along the flagellum for at least 2 lm, surrounding the axoneme in a half-moon shape. The axoneme is the longest component of the flagellum, and it follows the 9+9+0 pattern, with no central pair of microtubules. At the posterior region of the flagellum, the mitochondrion has a dumb-bell shape in cross sections that, together with the rectangular mitochondrial-associated rod, is responsible for the flattened shape of the flagellum. An internal membrane is observed surrounding both mitochondrion and its associated structure.

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“…Among insects and in the animal kingdom the only other example of natural lack of inner dynein arms in the doublet microtubules is found among the gall-midge flies: Cecidomyiidi and Asphondyliidi diptera. In these examples, giant axonemes are formed, which consist of a huge number of doublet microtubules, disposed to form a spiral or a series of rows in which the presence of only the outer arms on doublet microtubules support sperm motility; this finding [Dallai et al, 1996[Dallai et al, , 2007Lupetti et al, 1998;Mencarelli et al, 2001] demonstrates that for sperm motility it is not always required that an axoneme provided with a nine fold pattern and again that the 9 1 2 architecture is not the only way to construct a motile flagellar axoneme. Interestingly, as in Cecidomyiid diptera, also Mastotermes exhibits basal bodies formed by doublets rather than triplet microtubules, a condition common to many insect spermatozoa [Callaini et al, 1999].…”

Section: Discussion the Unique Multiflagellated Sperm In Insectsmentioning

confidence: 99%

Centrioles to basal bodies in the spermiogenesis of Mastotermes darwiniensis (Insecta, Isoptera)

Riparbelli

Callaini

Mercati

et al. 2009

Cell Motil. Cytoskeleton

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In addition to their role in centrosome organization, the centrioles have another distinct function as basal bodies for the formation of cilia and flagella. Centriole duplication has been reported to require two alternate assembly pathways: template or de novo. Since spermiogenesis in the termite Mastotermes darwiniensis lead to the formation of multiflagellate sperm, this process represents a useful model system in which to follow basal body formation and flagella assembly. We present evidence of a possible de novo pathway for basal body formation in the differentiating germ cell. This cell also contains typical centrosomal proteins, such as centrosomin, pericentrin-like protein, gamma-tubulin, that undergo redistribution as spermatid differentiation proceeds. The spermatid centrioles are long structures formed by nine doublet rather than triplet microtubules provided with short projections extending towards the surrounding cytoplasm and with links between doublets. The sperm basal bodies are aligned in parallel beneath the nucleus. They consist of long regions close to the nucleus showing nine doublets in a cartwheel array devoid of any projections; on the contrary, the short region close to the plasma membrane, where the sperm flagella emerge, is characterized by projections similar to those observed in the centrioles linking the basal body to the plasma membrane. It is hypothesized that this appearance is in connection with the centriole elongation and further with the flagellar axonemal organization. Microtubule doublets of sperm flagellar axonemes are provided with outer dynein arms, while inner arms are rarely visible.

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Sperm ultrastructure in Chironomoidea (Insecta, Diptera)

Cited by 7 publications

References 30 publications

The importance of insect sperm: Sperm ultrastructure of Hermetia illucens (black soldier fly)

The importance of insect sperm: Sperm ultrastructure of Hermetia illucens (black soldier fly)

The sperm of Hexagenia (Pseudeatonica) albivitta Walker (Ephemeroptera: Fossoriae: Ephemeridae)

Centrioles to basal bodies in the spermiogenesis of Mastotermes darwiniensis (Insecta, Isoptera)

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