They are now by many systematists united with the Acanthocephala and the Nematomorpha to form the group Nemathelminthes.
The study of the distribution of species dates back to the time of the early systematists, the study of vegetation to the time of the early botanical travellers.
The interesting little Rhodope veranyii, which has no odontophore, has been associated by systematists both with these simplified Opisthobranchs and with Rhabdocoel Planarians.
Yet as systematists their authors were no worse than Klein, whose Historiae Avium Prodromus, appearing at Lubeck in 1750, and Stemmata Avium at Leipzig in 1759, met with considerable favour in some quarters.
P. 425), though it must be admitted that he did not - because he then could not - perceive the bearing of their difference, which was reserved to be shown by the investigation of a still greater anatomist, and of one who had fuller facilities for research, and thereby almost revolutionized, as will presently be mentioned, the views of systematists as to this order of birds.
How would you define systematists? Add your definition here.