Dorylaimus (Subg. Doryllium) analatus, Ditlevsen, Hjalmar, 1927

Ditlevsen, Hjalmar, 1927, XXII. Free-living Nematodes from Greenland, Land and Freshwater., Meddelelser om Gronland 22, pp. 174-198 : 177-179

Dorylaimus (Subg. Doryllium) analatus n. sp.

Locality: Kapisigdlit (the Fjord of Godthaab ). 9. 7. - 24.8. 1926. Steinböck and Reisinger.

Upernivik. In 1926. Steinböck and Reisinger. moss. Aug.

Female: Length 1,8 mm. α = 24,4; ß = 5,0; y = 55,0.

Vulva 50,9 %.

Two full-grown females and some few young specimens are present.

Presumably this form belongs to the subgenus Doryllium , the structure of the spear being the same as in the foregoing species; only the wing-like outgrowths of the hindmost part seem to lack entirely, ‘ wherefore I have named it analatus.

The body-shape is about the same as in D. groenlandicus . In the front end it tapers somewhat more. The lip-region is marked by a more shal-. low furrow; it is truncate and the lips are indistinct. Papillee are ohwas vious but tiny. The lateral organ was not observed.

The spear is, as said, of the same structure as in D. groenlandicus and in D. macrodorus de Man ; it is divided in two parts, a proximal and a distal; the latter is strongly chitinized and straight; it is relatively thick at the base and tapers evenly towards the apex. The lumen of the interior opens, as in the foregoing species, immediately behind the tip. The proximal part is weakly chitinized and, in contradistinction to the two other species of this genus, it lacks the wing-like outgrowths. While in D. groenlandicus the distal and the proximal part of the spear were of the same length, the proximal part is, in the species under consideration, somewhat longer than the distal; the proportion is easily seen in the fig. 13 .

The oesophagus is somewhat longer in D. analatus than in D. groenlandicus , but regarding the scanty material at hand this proportion is of only insignificant importance. Also in this species the oesophagus is very narrow in its distal part and widens rather quickly caudad to the nerve ring. The intestine is — a feature which also holds good of D. groenlandicus —— very spacious, and in _ optical section its width is about twice the width of the proximal part of the oesophagus, a feature, obviously seen in fig. 11 .

A fact of presumably some systematic importance is that the ‘differentiated, anterectal part of the intestine is relatively much longer in D. groenlandicus than in D. analatus which is shown in the figs. 12 and 14 .

The female pore is, in the species under consideration, situated inconsiderably caudad to the middle of the body. The ovaries are symmetrical and reflexed.

The tail is short and rounded ( fig. 14 ).

Figures

Fig 13. Dorylaimus ana- latus. Front end.

Fig. 11. Dorylaimus groenlandicus. Hind part of the oesophagus.

Fig. 12. Dorylai- mus groenlandicus. Hind part.

Fig. 14. Dorylaimus analatus. Hind part.