The animal is of a cylindrical shape, but slightly gibbous on the dorsal side. The integument is not plicated. The corona is small and fairly oblique. No chin-like projection is observed. The head is not separated from the abdomen by a neck, and no eye spot is present. The dorsal antenna, which is represented by only a tuft of cilia, is situated at the level of the first third of the body. The foot is not so remarkably constricted off from the body. The toe is small, 30x10 µm in size, about one fifteenth of the total length. The general features of the trophi resembles those of genus Encentrum. Especially, trophi of Encentrum (Diglena) coezi (cf. De Beauchamp 1914) and Encentrum mustela (cf. Wulfert 1936) are allied to that of the present species: The trophi are large (67-73x47-57 µm) comparatively robust. The unci are 23-30 µm (including teeth) in length. The manubria are not so long (42-44 µm), bend suddenly towards the inside at the middle. The posterior end of each manubrium ends in a knobbed expansion (6-8x3 µm), and they meet in the middle forming a heart shape. The fulcrum is 18-20 µm in length, about 2/3 of the rami, ending with a weak apophysis (2.5x2.5 µm). There is found intramallei as in the typical species of Encentrum. The rami are lyrate, 6x23-28 µm in size, tapering gradually towards the tip. Both tips of the rami are ankylosed to the base of preuncinal teeth. Therefore, three pairs of long spines are found at the upper part of the unci. And, in this point, the present species is quite different from the majority of the species under the genus Encentrum. There is no teeth, but epipharyngeal structure, on the inner margin of the ramus. No alurae are present at the base of the rami. The oesophagus is of a normal type, 50-80 µm in length, 12-20 µm in diameter. The gastric glands are small, 18x30 µm in size, situated far apart from the stomach. The stomach is lobed, 150x100 µm in size, and distinctly separated from the intestine, the latter measuring 60-70 µm in length. The bladder 40x30 µm in size. The anus opens at the dorsal side of the foot at the level of 1/5 of the body from the posterior end. The foot glands are very large, 25x70 µm in size. The muscles are highly developed at both regions, foot and head. The present species is, in general contour, similar to Encentrum coezi, gula and mustela, but it is highly different from these in such structures as 1) preuncinal teeth, 2) toe, 3) basal plate of both unci and fulcrum, besides the lateral features of the body. (ref. ID; 3084)
Comments
In majority of the species belonging to the genus Encentrum, unci and rami have been reported to possess one (or two) pairs of teeth (or spines) at the tip. However, in the present species there are three acute spines at the tip of the unci, and no accessory spine at the tip of the rami. The present author, therefore proposes to establish a new genus for it. (ref. ID; 3084)
