Vol. 5 Issue 3
Moustafa M. Ramadan
The genus Neolepidapedon is briefly reviewed. Neolepidapedon (Neolepidapedoides) yamaguti n. sp. is described from Mulloidichthys auriflamma caught from the coastal waters of Al-Ghardaga, Red Sea. The new species differs mainly from the other species of the subgenus by the position of the cirrus pouch, ratio of oral sucker to ventral sucker, extension of vitellaria, and the body shape. The new species represents the first record of the genus Neolepidapedon in the Red Sea.
M.M. El-Naggar
A description is given of Proto Ancyl Discoides mansourensis n. sp. a monogenean from the gills of Chrysichthys auratus Geoffroy 1809, inhabiting the Demietta Branch of the River Nile in Egypt. The Proto Ancyl Discoides Paperna 1969, is reported for the first time in Egypt. C. auratus is a new host record for the genus Proto Ancyl Discoides. Particular attention has been paid to the reproductive system, digestive system, anterior adhesive apparatus and haptoral sclerites. A funnel-like structure, through which muscles to the dorsal hamuli pass, has been discovered in P. mansourensis. Possible functions of some internal organs are discussed. The diagnosis of the genus Proto Ancyl Discoides is emended.
Fayez A.M. Shoukr and Mohamed E. Abdel-Hamid
The gymnoblastic hydroid Tubularia crocea (Agassiz, 1862) was prominent among fouling communities in the Egyptian harbours at Alexandria, Port-Saied and Port-Taufiq. This hydroid showed morphological variation in the number of oral and aboral tentacles, and gonophores. These variables were significantly and positively correlated with the length of the hydroid. In spite of the morphological variation of this species, its identification is reliable and there is no need to construct a new species.
Sami K. Abdel-Hafez and Naim S. Ismail
Studies on the population dynamics of Theodoxus jordani (Sowerby 1836) in two localities, Makhadah (M) and South of Makhadah (SM) at Yarmouk River, North Jordan over a 14 month period revealed a higher density at SM than at M particularly during January, 1983. The effect of flooding which occurred during February, 1983 was more drastic on snails at the SM than at M station. The appearance of young snails during September, 1983 and January, 1984 indicates that T. jordani reproduces twice a year. The overall infection rate of T. jordani collected from the two stations with two types of cercariae (tailless and microcercous cercariae) was found to be 2.7% and 1.7%, respectively. Peak infection rates with the two types of cercariae occurred during September- October and December- January at both stations.
Hameed Al-Hajj, Suha Janakat and Fahmi Mahmoud
The sperm tail of A. stellio consists of a middle piece, a principal piece, and an end piece. The tail is connected to the nucleus with an extremely short neck, composed of a capitulum and a connecting piece with striated elements; no neck cylinder is present. The middle piece comprises mitochondrial sheath, fibrous sheath, nine dense fibers, and an axoneme of nine doublets and two singlets. Dense intermitochondrial plaques are present between the mitochondria, which are arranged end-to-end, in a longitudinal fashion. The fibrous sheath consists of fibrous rings which extend from the posterior two thirds of the middle piece till the end of the principal piece. The latter is made of an axonemal core within the fibrous sheath. The end piece is just a plain axoneme. The sperm plasma membrane surrounds all parts of the tail.