The body is fusiform, transparent. The integument is fairly ridged, but only the posterior part of the body is plicated. Each plication has two knob-like projection as in P. mittii. The corona is wholly ventral in position. The rostrum is large, decurved ventrally. There are two eyes at the base of the rostrum. No retrocerebral sac is observed. The toes are short, nearly 1/15 of the body length. At the dorsal side of the caudal extremity there is one remarkable projection 8x2 µm in size as in P. lutetiae. The trophi are closely related to that of Parencentropsis mittii, but different from it in the following points: 1) there is only one acute spine between the unci and rami, 2) the tip of the unci is bifid, forming two pairs of preuncinal teeth. This type of unci is hardly found among Encentrum species. (ref. ID; 3084)
The body is fusiform, transparent in ground colour. The integument is fairly ridged (6 in number on the trunk) just like Parencentrum in a broader sense of Wiszniewski. But, the plication is not remarkably found on the anterior half of the body. Each plication has two peculiar knob-like projections at the middle of the dorsum. The corona is ventrally situated, with fairly prominent, auricle-like tufts of long cilia. The rostrum is well developed but not pointed in the middle (cf. plicatum Wulfert, 1936). At the base of the rostrum there are two colourless eye spots. The subcerebral glands are obliterated. The breadth of abdomen is largest in the middle (one third of the body length), tapering gradually towards both extremities. No remarkable foot region is distinguished. The toes are short, 14 µm in length, 1/15 of the body length. The trophi are small and fine, but very particulate in form: The unci, which have accessory teeth at the tip, are highly developed so long (18-20 µm) as that of the manubria. Between unci and rami two comparatively long spines (10 µm and 8 µm in length) are present. At the tip, each ramus is ankylosed to the hinder part of the unci as in P. plutetiae (Wulfert 1936; Donner 1943), and P. plicatum (Wulfert 1936; Donner 1943). At the base of the rami there are neither alulae nor expansions. The fulcrum is very short, 3 µm in length. The posterior part of manubria is not curved as in P. lutetiae, P. plicatum, and perfectly fused. At the neck region there are three pairs of longitudinal muscle and one large salivary gland. The oesophagus is 18-22 µm in size. The foot glands are comparatively large, 18-20 µm in length and 10 µm in diameter. The vitellarium is large, 80-120x40 µm, occupying the whole part of the trunk, and having four large nuclei in it. (ref. ID; 3084)
Comments
The preset species is related to Parencentrum plicatum and P. lutetiae. But, it is clearly distinguished from them in the following points: 1) unci is very large and not stout, 2) each manubrium is perfectly ankylosed at the base, 3) absence of subcerebral sac. Therefore, the present author wishes to establish a new genus Parencentropsis for it. According to Wiszniewski (1953), Voigt (1956), the plication on the integument is regarded as a very important character deserving as the generic separation. If so the case, it is a very strange fact that the trophi of myersi (Wulfert 1936), saunderiae (Hudson) and semiplicatum (Wulfert 1939) are quite remote from plicatum and lutetiae. (ref. ID; 3084)
Etymology
The present specific name is dedicated to our princess, Mitiko Shoda. (ref. ID; 3084)
Quote from ref. ID; 3084