Mochtyella sp. A

Szaniawski, Hubert & Drygant, Daniel, 2014, Early Devonian scolecodonts from Podolia, Ukraine, Acta Palaeontologica Polonica 59 (4), pp. 967-983 : 970

Mochtyella sp. A

Fig. 4A–C .

Material.—Three isolated right MI and one left (MI ZPAL Sc.8/2.1–3), sample S.Kh.1 from lower part of the Borshchiv Horizon, section 48, Lower Lochkovian, Podolia.

Description. —Right MI about 1.3 mm long, slightly compressed laterally, of about the same width in dorsal as in lateral view. The main ridge has 13 to 15 denticles, gradually decreasing in size posteriorly. The basal ridge extends for about one third of the jaw length, bears about nine small denticles which decrease in size posteriorly. Second ridge lacking. In right lateral view the basal ridge is directed postero-basally, not parallel to the main ridge. In the posterior margin of the inner wall a small, half circular incision occurs. Left MI, known from one incomplete specimen, has very similar denticulation of the main ridge to that present in the right MI.

Remarks.—Right MI of Mochtyella sp. A is similar to the Mochtyella sp. C of Kielan-Jaworowska (1966) but differs from it by lack of the secondary ridge.

Figures

Fig. 4. SEM micrographs of mochtyellid scolecodonts from Podolia. A–C. Mochtyella sp. A, lower part of the Borshchiv Horizon, section 48, Lower Lochkovian, sample S.Kh.1. A. ZPAL Sc.8/2.1, right MI in dorsal (A 1), left lateral (A 2), and right lateral (A 3) views. B. ZPAL Sc.8/2.2, incomplete right MI in dorsal view. C. ZPAL Sc.8/2.3, incomplete left MI in dorsal view. D. Mochtyella? sp., anterior tooth; lower part of the Borshchiv Horizon, section 48, Lower Lochkovian, sample S.Kh.1, ZPAL Sc.8/2.21. E, F. Mochtyellidae gen. et sp. indet., undetermined elements MI, upper part of the Ivanye Horizon, section 76, Pragian. E. ZPAL Sc.8/11.5, sample S.IZ.13, incomplete right MI in left lateral view. F. ZPAL Sc.8/8.18, sample S.IZ.13, left MI in right lateral view.