Some Problems of the Taxonomy of the Pteraspids (Agnatha, Heterostraci) from Podolia (Ukraine)

• Дата: 2001
• Автор: Voichyshyn, V.К.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут зоології ім. І.І. Шмальгаузена НАН України 2001
• Теми: Фауна и систематика
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/9518
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Some Problems of the Taxonomy of the Pteraspids (Agnatha, Heterostraci) from Podolia (Ukraine) / V.К. Voichyshyn // Вестн. зоологии. — 2001. — Т. 35, № 1. — С. 27-37. — Бібліогр.: 18 назв. — англ.

The genus Podolaspis Zych, 1931 should today be considered to include three species, i. e., Podolaspis podolica (Alth, 1874), P. lerichei (Zych, 1927), and P. zychi (Brotzen, 1933), taking into account that distinguishing the first two of these species is difficult. The first, not quite correct description of the genera Parapteraspis Stensio, 1958 and Mylopteraspis Stensio, 1958 led to different nomenclative readings. Genus Parapteraspis is proposed to be considered sensu Novitskaya (1986) and the genus Mylopteraspis, sensu Blieck (1984). The analysis of published literature gives good reasons to think that the holotype of Zascinaspis bryanti (Brotzen, 1936) is the only known specimen of this species. One specimen of the reviewed material, which could be referred to Z. bryanti, shows, however, a triangular pineal plate in a non-contact type orbitopineal belt. Its place among pteraspids remains undetermined. At this point, further progress depends upon determination of the limits of species variability of characters such as the morphology of the orbital and pineal regions. A preliminary review of this variability in Z. heintzi (Brotzen, 1936) is provided. Short diagnoses of Podolian pteraspid genera, suitable for practical use, are given.