The Spermatozoa of the Scorpionfly Panorpa nuptialis: a Transmission Electron Microscope Study1

Gassner, George; Breland, Osmond P.; Biesele, John J.

doi:10.1093/aesa/65.6.1302

Cited by 13 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H The tail tip consists of a flattened axoneme with doublets and single microtubules flanked by a crystallised material (asterisk). Note that some microtubular singlets carry dynein arms new findings accord with the description by Gassner et al (1972) for P. nuptialis to the other Panorpa species and indicate that P. nuptialis is not less derived than P. germanica and P. annexa, as previously suggested (Jamieson et al 1999).…”

Section: Discussionsupporting

confidence: 88%

“…Previous spermatological studies performed by Baccetti et al (1969) on Panorpa germanica Linnaeus, 1758 and P. annexa McLachlan, 1869, and by Gassner et al (1972) on P. nuptialis Gerstaecker, 1863 indicated differences between these species, mainly concerning the claimed position of the centriole at the anterior tip in P. germanica and P. annexa.…”

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Sperm structure of Mecoptera and Siphonaptera (Insecta) and the phylogenetic position of Boreus hyemalis

et al. 2003

View full text Add to dashboard Cite

Sperm ultrastructure has been studied in three species of the taxa Mecoptera and Siphonaptera. The spermatozoon of the scorpion fly Panorpa germanica shows an apical bilayered acrosome, a helicoidal nucleus, a centriolar region and a 9+2 flagellar axoneme helicoidally arranged around a long mitochondrial derivative. A second mitochondrial derivative is very short and present only in the centriolar region. A single accessory body is present and it is clearly formed as a prolongation of the centriole adjunct material. Two lateral lamellae run parallel to the nucleus. The snow fly Boreus hyemalis has a conventional sperm structure and shows a bilayered acrosome, a long nucleus, a centriolar region, two mitochondrial derivatives and two accessory bodies. The axoneme is of the 9+2 type and is flattened at the tail tip. Both P. germanica and B. hyemalis have two longitudinal extra-axonemal rods and have a glycocalyx consisting of longitudinal parallel ridges or filaments. The spermatozoon of the flea Ctenocephalides canis has a long apical bilayered acrosome, a nucleus, a centriolar region, a 9+2 axoneme wound around two unequally sized mitochondrial derivatives, and two triangular accessory bodies. In the posterior tail end the flagellar axoneme disorganises and a few microtubular doublets run helicoidally around the remnant mitochondrial derivative. The glycocalyx consists of fine transverse striations. In all three species, the posterior tail tip is characterised by a dense matrix embedding the disorganised axoneme. From this comparative analysis of the sperm structure it is concluded that Mecoptera, as traditionally defined, is monophyletic and that B. hyemalis is a member of Mecoptera rather than of Siphonaptera.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 92%

Sperm structure of Mecoptera and Siphonaptera (Insecta) and the phylogenetic position of Boreus hyemalis

et al. 2003

View full text Add to dashboard Cite

show abstract

“…These studies have consistently demonstrated that an increase in larval rearing density is associated with an increase in ejaculate investment, probably as a response to an expected risk of sperm competition during adult phase. Similar to many other insect species (Witalis & Godula, 1993;Grandi, 1994;Friedlander, 1997;Carcupino et al, 1998;Cepeda-Palacios et al, 2001;Weller et al, 2001) sperm production in Panorpa scorpionflies starts in the prepupal stage (Gassner et al, 1972). Consequently, sperm length and possibly testis size are likely to be determined during larval development and hence, males are expected to be sensitive to signals which predict the future risk and intensity of sperm competition.…”

Section: Discussionmentioning

confidence: 85%

Phenotypic plasticity in sperm traits in scorpionflies (Mecoptera: Panorpidae): Consequences of larval history and seasonality on sperm length and sperm transfer

Vermeulen¹,

Engels²,

Engqvist³

et al. 2009

Eur. J. Entomol.

View full text Add to dashboard Cite

Abstract. We examined effects of seasonality, larval food availability and larval rearing density on sperm length, sperm transfer rates and body size in the bivoltine scorpionfly Panorpa vulgaris. Males of the first annual generation were larger and had larger sperm. Comparing individuals of two summer generations showed that adult males resulting from group bred, ad libitum fed larvae were larger but had smaller sperm than males resulting from singly kept, food deprived larvae. Thus, sperm size is not a simple function of body size. Instead, we suggest that sperm size modification was caused by varying rearing densities. Group bred individuals produced smaller sperm but transferred at higher rate. This indicates a trade-off between sperm number and sperm size as predicted by evolutionary models of sperm production. Given the strong influence of larval history in our present work, we recommend that future studies investigating the consequences of varying sperm competition risk or intensity on male gametic strategies should also control for larval history in order to avoid distorting effects.

show abstract

“…This extension is known as an accessory body (AB) (Dallai et al 2003). In Mecoptera, there have been consistent reports of the presence of CAM and ABs in spermatozoa, but there is variation in its description among the species (Baccetti et al 1969;Gassner et al 1972;Dallai et al 2003;Xie and Hua 2010). In B. planus, two ABs that extended down the length of the flagellum were observed (Xie and Hua 2010).…”

Section: Discussionmentioning

confidence: 97%

“…Structures similar to the EARs were seen in B. planus (Figures 7D,, wherein the structures were labeled as ABs (Xie and Hua 2010). There appears to be some confusion in the literature between ABs and EARs (Baccetti et al 1969;Gassner et al 1972;Dallai et al 2003;Xie and Hua 2010), but there are morphological differences separating ABs and EARs that can be used to distinguish between them. The ABs typically remain less distinct in outline, whereas the EARs often develop sharper edges.…”

Section: Mds In B Planusmentioning

confidence: 99%

Spermatozoon Ultrastructure of Hangingflies,Bittacus strigosusandBittacus stigmaterus

Shepardson¹,

Humphries²,

Pelkki³

et al. 2014

Journal of Insect Science

View full text Add to dashboard Cite

The Spermatozoa of the Scorpionfly Panorpa nuptialis: a Transmission Electron Microscope Study1

Cited by 13 publications

References 0 publications

Sperm structure of Mecoptera and Siphonaptera (Insecta) and the phylogenetic position of Boreus hyemalis

Sperm structure of Mecoptera and Siphonaptera (Insecta) and the phylogenetic position of Boreus hyemalis

Phenotypic plasticity in sperm traits in scorpionflies (Mecoptera: Panorpidae): Consequences of larval history and seasonality on sperm length and sperm transfer

Spermatozoon Ultrastructure of Hangingflies,Bittacus strigosusandBittacus stigmaterus

Contact Info

Product

Resources

About