Two New Trematodes from Philippine Fishes

Abstract

One adult specimen of this parasite was collected from the intestine of Teuthis concatenata (Cuvier and Valenciennes) on May 26, 1945. Description. The specimen is 4.17 mm long; at the junction of the last body third, it reaches its greatest width of 1.02 mm. The body is elongate with broadly rounded anterior end and pointed posterior end. Cuticular spines are not present. The subterminal, oval oral sucker is 0.21 mm in diameter. The prepharynx is long and straight, measuring 0.56 mm in length. The pharynx is weakly muscular and has a diameter of 0.13 mm. The intestinal bifurcation is directly behind the pharynx. The ceca are wide and run in a straight course, terminating slightly anterior to the margins of the testes. The genital pore opens on the midline, approximately half way between the oral sucker and the pharynx. The two, large, spherical testes measure 0.30 mm in diameter. They are symmetrical and lie close to one another in the posterior part of the last quarter of the body length. A cirrus sac, supposedly present in this genus but very inconspicuous, could not be observed in my specimen. The seminal vesicle, a coiled tube in the type species, was also invisible. The large spherical ovary measures 0.24 mm in diameter. It is situated immediately posterior to the testes, with the greater part of its bulk dextral to the median line. A seminal receptacle is lacking. The large vitelline follicles extend posteriorly from the anterior third of the body to the testes. They are in the lateral fields except for a group of four intercecal follicles posterior to the intestinal bifurcation, and a larger intercecal group anterior to the testes (Fig. 1). The ascending uterus describes a few coils posterior to the left testis, passes between the two testes and becomes thrown into numerous intercecal, transverse folds anterior to the testes. Before reaching the intestinal bifurcation, the uterus becomes almost straight. The oval eggs measure 82 to 90 by 52 to 56mA,