Beitrag zur Morphologie und Synonymie von Ascaridia galli Schrank 1788

A Study of Eggs of Ascaris lumbricoides var. suum with the Electron Microscope

“…the outer protein coat, the middle chitinous shell, and the inner lipoid layer. The report of Frenzen (1954) that the egg envelope of Ascaris lumbricoides includes four layers is not supported by the present work. The portion of the egg indicated as a separate layer by him is probably the zone of separation between the protein coat and the chitinous shell.…”

“…The number of layers surrounding the egg of ascarids has been reported as three (Nelson, 1851, Ascaris 'mystax;Leuckart, 1886, Ascaris luwibricoides; Ackert, 1931, Ascaridia lineata;Wottge, 1937, Parascaris megalocephala;Christenson, 1940, Ascaris lumbricoides), four (Kreuzer, 1953, Ascaris lu~.izbricoides; Frenzen, 1954, Ascaridia galli, and five (Zavadovsky, 1928, Ascwis). A variety of techniques has been used by different authors in studying the egg layers, including microscopic observations of the penetration of substances into the egg, polarizing and fluorescent microscopy, centrifugation, and chemical tests on the membranes.…”

Note on morphology of two nematode species Ascaridia hermaphrodita and Ascaridia platyceri (Nematoda): scanning electron microscope study

“…In an illustration by Schneider (1866), the tooth-like ribbon of the lip overlaps only the upper and lateral parts of the medial lobe, which, however, corresponds with the description of A. platyceri rather than A. compressa. Therefore, it is impossible to consider A. compressa as a species conspecific with A. galli (Schrank, 1788) as suggested by Frenzen (1955). Also in the description of A. serrata (Schneider, 1866) from Penelope humeralis and Pipile jacutinga (Cracidae, Galliformes) in Brazil, the presence of anterior and posterior tooth lamellae is mentioned.…”