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A study of egg assembly in the monogenean [platyhelminth] fish skin parasite, Entobdella soleae, using a fast preservation technique and transmission electron microscopy

100%

Tappenden T., Kearn G.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

2

An experimental study of egg assembly in the monogenean [platyhelminth] skin parasite Entobdella soleae, using a fast preservation technique and transmission electron microscopy

80%

Tappenden T., Kearn G. C.

Acta Parasitologica

|

1999

|

tom 44

|

nr 1

Stages in the assembly of the egg in the monogenean skin parasite Entobdella soleae have been studied using a fast preservation technique for transmission electron microscopy. The first event is the release by the germarium of a fertilised oocyte, which travels to the ootype followed by many vitelline cells. There are two types of Mehlis' gland and the secretion from one of these (beta) is thought to promote the release of the vitelline droplets, which fuse peripherally in the distal tetrahedral chamber of the ootype to produce the eggshell. Initially, the zygote lodges in the distal corner of the chamber, perhaps held in place by cortical granule material, and prevents shell deposition in this corner. However, this is temporary, and when the zygote leaves the corner the opercular eggshell is laid down. The egg appendage is assembled in the proximal tubular part of the ootype and the adhesive droplets on the appendage are derived from the second (alpha) type of Mehlis' secretion.

3

An ultrastructural study of the egg assembly region of the female reproductive tract of the monogenean [platyhelminth] skin parasites Entobdella soleae and E.hippoglossi

70%

Tappenden T., Kearn G. C.

Acta Parasitologica

|

1999

|

tom 44

|

nr 1

An ultrastructural study has been made of the egg assembly apparatus of the monopisthocotylean monogenean skin parasites Entobdella soleae and E. hippoglossi from the common sole, Solea solea, and the halibut, Hippoglossus hippoglossus, respectively. The ootype consists of a distal tetrahedral chamber where the egg capsule is assembled and a proximal ootype tube where the egg appendage is made. Two types of Mehlis' gland (alpha and beta) open at the proximal end of the ootype tube, which has a non-secretory lining. In both species, the tetrahedral ootype chamber has a syncytial lining, which apparently is not secretory and possesses on its luminal surface stud-like projections, each with vacuolated cytoplasm and an electron-dense core. The ootype chamber is enclosed by a single layer of muscle fibres and is embedded in a spongy "connective tissue". The uterus in E. soleae has a cellular secretory lining, with densely packed luminal microvilli.

Ograniczanie wyników

2 Acta Parasitologica

1 Wiadomości Parazytologiczne

3 Tappenden T.

2 Kearn G. C.

1 Kearn G.

2 1999

1 1998

A study of egg assembly in the monogenean [platyhelminth] fish skin parasite, Entobdella soleae, using a fast preservation technique and transmission electron microscopy

An experimental study of egg assembly in the monogenean [platyhelminth] skin parasite Entobdella soleae, using a fast preservation technique and transmission electron microscopy

An ultrastructural study of the egg assembly region of the female reproductive tract of the monogenean [platyhelminth] skin parasites Entobdella soleae and E.hippoglossi