The aberrant spermatogenesis of the Haplothrips simplex (Buffa) (Thysanoptera): ultrastructural study

Tissue & Cell
Eugenio PaccagniniR Dallai

Abstract

The aberrant spermatogenesis of the haploid insect Haplothrips simplex (Thysanoptera) is described. The process, which occurs in the pupal instars, is characterized by two mitotic divisions, the second of which gives rise to two different-sized spermatids: the larger spermatids have a nucleus with diffuse chromatin and proceed into spermiogenesis, while the small spermatids have pycnotic nuclei and degenerate. Both types of spermatids contain two centrioles parallely rather than orthogonally oriented. The occurrence of two centrioles supports a close relationship between Thysanoptera and Phthyraptera. Before the beginning of spermiogenesis, however, the functional spermatids show the unusual presence of a third parallel centriole which is formed by the duplication of one of the two pre-existing centrioles.

References

Sep 25, 1999·The Journal of Experimental Zoology·R DallaiF Frati
Jul 13, 2001·Current Biology : CB·W F Marshall
Aug 19, 2003·Developmental Biology·Maria Giovanna Riparbelli, Giuliano Callaini
Jan 1, 1947·The Journal of Heredity·P W WHITING
Sep 1, 1991·Journal of Morphology·R DallaiP L Bellon

❮ Previous
Next ❯

Citations

Jun 15, 2010·Tissue & Cell·Eugenio PaccagniniRomano Dallai
Feb 23, 2010·Tissue & Cell·Maria Giovanna RiparbelliGiuliano Callaini
Aug 23, 2008·Arthropod Structure & Development·Eugenio PaccagniniRomano Dallai
Mar 24, 2009·Cell Motility and the Cytoskeleton·Maria Giovanna RiparbelliRomano Dallai
Jun 29, 2007·Cell Motility and the Cytoskeleton·Eugenio PaccagniniRomano Dallai
Aug 17, 2011·Journal of Parasitology Research·Kabkaew L SukontasonKom Sukontason
Apr 16, 2014·Arthropod Structure & Development·Romano Dallai
Jul 23, 2021·Arthropod Structure & Development·Stephanie Krueger, Gerald Moritz

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.