Sperm dimorphism in theTriatoma brasiliensisspecies complex and its applications

2017 ◽  
Vol 31 (2) ◽  
pp. 192-199 ◽  
Author(s):  
A. F. BAFFA ◽  
D. C. P. CAMARA ◽  
J. R. SANTOS-MALLET ◽  
E. R. DA SILVA ◽  
J. COSTA ◽  
...  
Keyword(s):  
Sperm Dimorphism

Ultrastructural evidence of sperm dimorphism in Deladenus sp. (Tylenchomorpha: Sphaerularioidea: Allantonematidae)

Nematology ◽  
2007 ◽  
Vol 9 (3) ◽  
pp. 397-404 ◽  
Author(s):  
Hajime Kosaka ◽  
Manabu Kusunoki ◽  
Vladimir Yushin
Keyword(s):  
Electron Microscope ◽  
Parasitic Nematode ◽  
Spermatogenic Cells ◽  
Ultrastructural Evidence ◽  
Transmission Electron ◽  
Parallel Fibres ◽  
Sperm Dimorphism ◽  
Whole Life Cycle ◽  
First Time ◽  
Spherical Vesicles

AbstractThe dimorphic spermatozoa of the insect-parasitic nematode Deladenus sp. (Tylenchomorpha: Sphaerularioidea: Allantonematidae) were studied for the first time with a transmission electron microscope (TEM). The immature spermatozoa from the testis of mycetophagous males are 10-12 μm diam. and 4-5 μm long unpolarised cells with a centrally located nucleus without a nuclear envelope. The cytoplasm contains mitochondria and specific components, membranous organelles (MO) and fibrous bodies (FB). The MO are spherical vesicles with an internal system of finger-like invaginations of the membrane; the spindle-shaped FB consist of tightly packed parallel fibres. Spermatozoa from the uteri of infective females of Deladenus sp. are vastly different in size being tiny cells ca 2 μm diam. with a spherical or oval nucleus. Each cell contains several mitochondria and MO. Although each individual of Deladenus sp. contains only monomorphic spermatozoa, sperm dimorphism was revealed after analysis of the whole life cycle. Despite a difference in size the cytological characters of both types of spermatozoa conform to the typical rhabditid pattern. The presence of both MO and FB in sphaerularioidid spermatozoa differentiates the superfamily Sphaerularioidea from Tylenchoidea whose representatives lack MO in the spermatogenic cells.

Sperm dimorphism in Chilopoda: comparison of Scolopendromorpha and Geophilomorpha

1999 ◽  
Vol 35 (1) ◽  
pp. 45-53 ◽  
Author(s):  
MARCELLA CARCUPINO ◽  
ANNALISA BALDACCI ◽  
ANNA MARIA FAUSTO ◽  
GIUSEPPE SCAPIGLIATI ◽  
MASSIMO MAZZINI
Keyword(s):  
Sperm Dimorphism

Sperm dimorphism and spermatozeugmata in the commensal bivalve Pseudopythina macrophthalmensis (Galeommatoidea, Kelliidae)

Zoomorphology ◽  
2001 ◽  
Vol 120 (3) ◽  
pp. 177-189 ◽  
Author(s):  
Å. Jespersen ◽  
Takeharu Kosuge ◽  
Jørgen Lützen
Keyword(s):  
Sperm Dimorphism

SOME OBSERVATIONS ON SPERM DIMORPHISM

1929 ◽  
Vol 57 (5) ◽  
pp. 267-271 ◽  
Author(s):  
GERARD L. MOENCH ◽  
HELEN HOLT
Keyword(s):  
Sperm Dimorphism

Sperm dimorphism in Nicotiana tabacum L.

2001 ◽  
Vol 14 (1-2) ◽  
pp. 123-125 ◽  
Author(s):  
Hui Qiao Tian ◽  
Zhaojie Zhang ◽  
S. D. Russell
Keyword(s):  
Nicotiana Tabacum ◽  
Nicotiana Tabacum L ◽  
Sperm Dimorphism
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