Oogenesis is a fundamental biological process observed in most animals. Animals employ
many different mechanisms to make their eggs and oogenesis cannot be completed without …

Animal female and male germ-line cells often form syncytial units termed cysts, clusters, or
clones. Within these cysts, the cells remain interconnected by specific cell junctions known …

Acanthobdellida gnaw into the sides of salmonid fishes in frigid Arctic lakes and rivers,
latching on with fearsome facial hooks. Sister to leeches, they are an ancient lineage with …

The paired ovaries of E. albidus are like a bunch of grapes and are composed of clearly
separated units, syncytial germ cysts (clusters), which are surrounded by a thin layer of …

Germ cell cluster organization and the process of oogenesis in Dactylobiotus
parthenogeneticus have been described using transmission electron microscopy and light …

The studies on the fates of the trophocytes, the apoptosis and autophagy in the gonad of
Isohypsibius granulifer granulifer have been described using transmission electron …

Ovaries of Haplotaxis sp. were studied in active and nonactive states, that is, in a sexually
mature specimen and in specimens outside of the reproductive period. Two pairs of ovaries …

Recent studies on the ovary organization and oogenesis in Tubificinae have revealed that
their ovaries are small polarized structures that are composed of germ cells in subsequent …

An epistemological–evolutionary conception of leeches (Hirudinida) based on features of
the female reproductive system in combination with other morphological characters is …

The genus Grania comprises over 70 species of exclusively marine clitellate annelids
belonging to the family Enchytraeidae. Morphologically, this genus is well separated from …