TITLE:
Description of a New Species of Sphincteristomum from Sparid Fishies of the Algerian Coast (Western Mediterranean)
AUTHORS:
Sihem Abid-Kachour, Salim Mouffok, Zitouni Boutiba
KEYWORDS:
Digenea; Sphincteristomum Oshmarin; Oran bay; Pagellus erythrinus; Teleostei
JOURNAL NAME:
Journal of Environmental Protection,
Vol.4 No.10,
October
10,
2013
ABSTRACT: The
objectif in the present study is description of a new species of Sphincteristomum Oshmarin, Mamaev &
Parukhin 1961, named Sphincteristomum mediterraneae, which is described in Oran bay, Algeria. It parasitizes
the intestine of naturally infected Pagellus erythrinus, Teleostei, Sparidae. The Pagellus erythrinus is in important food fish in the Mediterranean. This genus belongs to the family Apocreadiidae, sub family Schistorchiinae,
characterized by an obvious oral muscular sphincter, into a large oral sucker,
a disc-shaped acetabulum under the intestinal bifurcation, an ocular pigment
scattered in the forebody, a sequence ovary and two testes in tandem and a
I-shaped excretory bladder. In the new
species, the digestive apparatus displays a hexagonal peculiar aperture,
followed by a longitudinal slit, a waved pharynx, two long and broad caeca,
with a thick internal wall of endothelial cells. Each caecum has a sub terminal
anus. The female genital apparatus displays a
transversally elongated ovary, under the acetabulum. On the side of the ovary, there is a small Mehlis gland. Under the ovary, there are two transverse converging vitelloducts. Lateral
and extracaecal vitelline follicles, are spread near the caeca. They converge
in the hindbody. The relatively short uterus is preovarian, mainly. It contains
few large yellow eggs. Its distal part is creased transversally, just before
ending in genital atrium. The male genital apparatus shows two lobed
heart-shaped testes, post ovarian, in tandem. From the anterior edge of each
testis, two spermiducts climb up and converge into a naked, curved or sinuous
seminal vesicle, followed by a short
prostate surrounded by few prostatic cells, and a narrow ejaculatory
duct, opening in genital atrium. The genital pore is close to the acetabulum
and the intestinal bifurcation. No cirrus pouch. The excretory system shows a relatively short tubular I-shaped bladder,
reaching the inferior level of the second testis. Two thin excretory arms are
seen until the forebody of the worms. The terminal excretory pore is closed by
a small sphincter. In the same P. eryrthrinus,
immature worms devoid of genitalia, young worms with genitalia devoid of eggs
and ovigerous worms, live together with senile specimens. These last ones show still, oral sucker, diffuse vitelline
follicles and very small and scattered ocular pigment.