Otostephanus (= Otostephanos) Milne, 1916
Order Philodinida: Family Habrotrochidae (ref. ID; 6565)

[ref. ID; 1923]
Sides of coronol pedicels with shelf-like membrane. In drying mosses. (ref. ID; 1923)

Otostephanus auriculatus (Murray, 1911) (ref. ID; 1345, 1923, 2757)
Syn; Habrotrocha auriculata Murray, 1911 (ref. ID; 1345, 2757)
Otostephanus auriculatus var. bilobatus Hauer, 1939 (ref. ID; 1345, 2271, 3149 original paper)
Otostephanus cuspitiabris de Koning, 1947 (ref. ID; 1345)
Otostephanus donneri nom. nov. Bartos, 1959 (ref. ID; 3688)
Otostephanus kostei Donner (ref. ID; 1474 original paper)
Otostephanus macrantennus de Koning, 1947 (ref. ID; 1345)
Otostephanus monteti Milne, 1916 (ref. ID; 1345, 2269, 2640, 3688)
Syn; Habrotrocha torquata Montet, 1915 (ref. ID; 1345); Habrotrocha torquata var. Montet, 1915 (ref. ID; 3688)
Otostephanus mundiformis de Koning, 1947 (ref. ID; 1345)
Otostephanus torquatus (Bryce, 1913) (ref. ID; 1345, 1474, 2562, 3136, 3149, 3688) reported author and year? (ref. ID; 2972)
Syn; Callidina elegans Ehrenberg, 1832 (ref. ID; 3688); Habrotrocha torquata Bryce, 1913 (ref. ID; 1345, 3136, 3149, 3688); Otostephanus torquatus Milne, 1916 (ref. ID; 1345, 3136)

Otostephanus auriculatus var. bilobatus Hauer, 1939 (ref. ID; 1345, 2271, 3149 original paper)
Description; In size rather variable, brown in colour with light longitudinal folds, trunk, foot and spurs lightly granulated. Dorsal antenna of medium length. The head with the typical 'ears' of the species, discs wider than the head, the upper lip terminating in a tongue-shaped formation with a thickened support, and a notch in the anterior edge and reaching to the level of the discs. Large mastax with ten or more teeth all fairly fine but with the first four slightly heavier than the remainder, which diminished in thickness to the rear. Spurs small, conical, slightly cut-out with interspace present but only small. (ref. ID; 2271)
[Egg] Egg elliptical, 62 x 88 um. (ref. ID; 2271)
Measurements; Animal 1st sample: Length of creeping animal 290; length of feeding animal 190-230; length of between the anterior edge of the discs and the mastax 50; width across the trochal discs 50; width across the neck segment 38; length of the unci 21 um. Animal 2nd sample: Length of creeping animal 450; length of feeding animal 314; length of between the anterior edge of the discs and the mastax 88; length of the unci 32 um. (ref. ID; 2271)

Otostephanus torquatus (Bryce, 1913) (ref. ID; 1345, 1474, 2562, 3136, 3149, 3688) reported author and year? (ref. ID; 2972)
Syn; Habrotrocha torquata Bryce, 1913 (ref. ID; 1345, 3136, 3149); Otostephanus torquatus Milne, 1916 (ref. ID; 1345, 3136)
Description; The body is of medium size. The wheel-organ is as broad as the neck or it is slightly broader than the neck. The wheel-discs are more or less dorsally reverted. The upper lip is very high. It is not cut out, but the tip of it is a little reverted. The lower lip is unusually large and protrudes in a spoonlike shape. The dorsal antenna is long. On the wheel-pedicels the cuticular rings in the half level of pedicels very well developed. The foot is four-jointed, but is short. On the first foot-joint sits a dorsal knob. The spurs are short, divergent, and conical in size. The dorsal plicae on the preanal segment are very well developed. D. f.: 6/6 or it is higher. (ref. ID; 3136)
Measurements; The length of the body 410 um, usually the individuals are much shorter (320 up to 350 um). (ref. ID; 3136)