t_gad_2000

Prof. Tarek G. Ismail

Professor - Professor

Faculty of science

Address: Zoology Department - Faculty Of Science - Sohag University

10

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2021 | Keywords Geometric morphometric,
A geometric morphometric analysis of heterochely in the Red Sea hermit crab Clibanarius signatus and their developmental stability and modularity
Geometric-morphometric analysis is growingly used to quantify/analyze biological forms and discriminate among subtle variation in shape. The hermit crab “_Clibanarius __signatus__”_ showed subtle heterochely; therefore, geometric morphometric analysis helps to determine visually these shape changes. Individuals of “C. signatus” were collected from a mangrove site on the Egyptian Red Sea coast. The present study aimed to: "1" detect the different ... Read more

2021 | Keywords Body shape variations,
Seasonal shape variations, ontogenetic shape changes, and sexual dimorphism in a population of land isopod Porcellionides pruinosus: a geometric morphometric study
BACKGROUND: Isopods shape features are sensitive and respond to several selective pressures which may result in variations of these features. These pressures might reflect the heterogeneity of the environment where an animal lives. Land isopods _Porcellionides pruinosus_were collected from an agricultural field. Landmarks geometric morphometrics was applied to evaluate its shape changes during two different seasons. The present work aims ... Read more

2019 | Keywords Water mites, Unionicola, Cutic,
Studies on the cuticle and musculature of freshwater mite, Unionicola aegyptiaca.
ABSTRACT BACKGROUND: The aquatic Acari are known as water mites and occupy a wide range of habitats. The freshwater mites, Unionicola aegyptiaca, were collected from the freshwater mussel, Caelatura aegyptiaca, River Nile, Sohag,Egypt. The present paper focuses on the structure of the cuticle and musculature of freshwater mite, U. aegyptiaca. RESULTS: Histologically, the cuticle consists of two main layers: epicuticle ... Read more

Effect of geographic location and sexual dimorphism on shield shape of the Red Sea hermit crab Clibanarius signatus using geometric morphometric approach.
The hermit crab _Clibanarius signatus_ Heller,1861, inhabits varied intertidal habitats of the Red Sea coast, such as rocky shores and mangrove littoral salt marshes. Shield-shape variation among three populations of _C. signatus _was analyzed with geometric morphometric methods. Shape variation was studied through multivariate analyses using configurations aligned by the generalized Procrustes analysis. Shape variation was explored through principal component ... Read more

Histological and ultrastructural studies of spermatogenesis of freshwater mite, Unionicola aegyptiaca (Acari, Unionicolidae).
The male genital system of the water mite, _Unionicola aegyptiaca_ consists of an accessory gland, two spherical testes, two vasa deferentia, common vas deferens, an ejaculatory complex and spermatopositor (penis) and is supported with male genital skeleton. It is evident that each testis enclosed in a very thin amorphous layer (basal lamina) and consists of a germinal part, in which ... Read more

Studies on the Abundance, Temporal Distribution and Diversity of Spiders (Arachnida: Araneae) Associated with Lemon Trees in a Site at Sohag Governorate, Egypt
Spiders have an important role in the agroecosystems. They are effective in suppressing the pest populations as biological controllers. This study aimed to study the abundance, temporal distribution and diversity of spiders in an agriculture research site at Jazirat Shandweel, Sohag District, Sohag Governorate, Egypt. The sampling was carried out monthly from January to December 2016 using the beating and ... Read more

2018 | Keywords aquatic orbited mites,
Description of two new species of aquatic orbited mites (Family: Malaconothridae, Genus: Malaconothrus) Sohag, Egypt.
Two oribatid mite species belonging to the genus Malaconothrus, namely _Malaconothrus ramadani_ sp. n. and _Malaconothrus transversus_ sp. n., were described as two new species. They were collected from the roots of the floating aquatic plant, Eichhornia crassipes in River Nile, Girga city, Sohag Governorate, Egypt. The first species, _Malaconothrus ramadani_ sp. n., is clearly characterized by zigzag-like lateral margins ... Read more

2018 | Keywords Araneae, Biodiversity, Identif,
Spiders (Arachnida: Araneae) of Jazirat Shandweel District, Sohag Governorate, Egypt.
This study gives highlights on the biodiversity of spiders in an olive trees orchard, a lemon trees orchard, and webs of Cyrtophora citricola at Jazirat Shandweel District, Sohag Governorate, Egypt. In addition, it gives a preliminary list of spiders based on the main taxonomic characters. The sampling was carried out weekly or monthly during the period: September, 2015 to January, ... Read more

A new aquatic oribatid mite, Trimalaconthrus crassipes n. sp. (Family: Malaconothridae), Sohag, Egypt.
_ Trimalaconothrus crassipes_ sp. n. was described for the first time from the roots of the floating aquatic plant, _Eichhornia crassipes_, River Nile, Girga, Sohag, Egypt. The present species has the characteristic features that are in accordance with those of family Malaconothridae and genus_ Trimalaconothrus_. The present species has specific characters compared with characters of other species of the same ... Read more