Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXIII (1927)
Harring, H. K.; Myers, F. J.
The rotifer fauna of Wisconsin. IV. The Dicranophorinae, pp. -Plate 49 ff. PDF (41.5 MB)
668 Wisconsin Academy of Sciences, Arts, and Letters. I be considered a monograph of all existing Dicranophorinae; very evidently it deals with only a small fraction of the species that will eventually be described. Nevertheless, fragmentary as the work admittedly is, it may be of some service in making comparisons with the fauna of other reoP1ns vithout timP-PonnQmrinof -4 Al 1 HWJ the' has tudii fled of ti sxe1--K V~lbl.---/ lil-JW-Wl~o~l~l~l~s~j --- II ...V ucll " eLIIU also 4 open as the only substitute for identified type material at present fuler available. closi We are indebted to Mr. David Bryce and to Mr. F. E. In Cocks for essential material from England, and to Dr. P. the: de Beauchamp for drawings and material collected in I semi France, and also for his friendly advice and coopera- roug tion. Herr J. 1-auer, of Uoereschach, Baden, kindly sent us material of what proved to be an undescribed species, which we take pleasure in naming for him. In subdividing this group consideration has been given not only to the inert contour of the trophi, the sclerified parts of the mastax wall, but also to the musculation, which is probably less subject to specific variation and of deeper significance. The most primitive rotifer family, the Notom- matidae, must have divided early into two branches, the Notommatinae, plant and detritus feeders, and the Di- cranophorinae, carnivores. The originally malleate mas- tax has been correspondingly modified, the terminal types being the virgate or pumping and the forcipate, each with its subtnes. 'y ' T most mr mf 4rimit ix+-r f of +Ih for,+te their mid- man, tens( T1 Dier by I able Stre] opho nece E] trurr basa -_-Z,_.1 -ittl--: t~tl---'blVU ..YJ1J VJ --1C --1Wl->; they mastax is found in Dicranophorus, as constituted here; the The mallei have been turned into the plane of the incus and the extei entire mastax is longitudinal with reference to the axis of A the body. The unci have retained but a single tooth, aituri showing occasionally remnants of a second; but they are cies, hinged at or near their tips on the rami, the whole forming de E a highly efficient grasping organ. The muscles belonging conv to the mallei are well developed, the flexors attached to mati the external edges of the rami and the posterior ends of pate the manubria, the extensors to the anterior edges of the tensi unci and the external edges of the manubria, passing over the i the joint. hydr In Encentrurn the malleus muscles have been lost and the view weak, needle-like unci ankylosed to the external edges of the i
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