Kovács I. (szerk.): A Magyar Természettudományi Múzeum évkönyve 78. (Budapest 1986)

Farkas, H.: The variability problem of Schuleridea (Aequacytheridea) perforata (Roemer, 1838) (Ostracoda; Eocene)

General conclusions The "high form" and the "low form" are not clearly differentiated from each other. This question will have to be answered after some thorough examinations. This time, it can be stated that the ventral line of the "low specimens" is concave, thus the specimens resemble a bean, appearing more slender than they are in nature. The variability of any given population is by far not as great as it is suggested in the various papers of the technical literature. Techniques of measurement By the investigation of the shells of Schuleridea species, I intended to show the method applied. The combined use of the zoom microscope and the ocular network-micrometer affords a quick and precise identification of most of the Ostracod species. The outline in the lateral view of the shell can be characterized by rows of numbers; by the differences expressed in numerical terms, the populations and species can be characterized unequivocally, and the morphological analysis of the populations becomes possible. The technique applied will be clear immediately if Fig. 1 is consulted. The network corresponds in essence 81 70 1ÏÔ0 90 SO 70 60 50 40 30 20 Fig. 2. Schuleridea perforata "mean-line": right shell