Rabienella? lagowiensis, Grundel, 1962

Olempska, Ewa, 2002, The Late Devonian Upper Kellwasser Event and entomozoacean ostracods in the Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 47 (2), pp. 247-266 : 258-261

Rabienella? lagowiensis sp. nov.

Fig. 7C, D .

Holotype: ZPALO. 52/76; Fig. 7C .

Type horizon: Latest Frasnian, E. (E.) splendens Zone.

Type locality: Płucki, Holy Cross Mountains, Poland.

Derivation of the name:FromŁagów,atownintheHolyCrossMountains.

Diagnosis.—Medium−sized Rabienella (lengthupto1.7mm) differs from other species of the genus in having numerous concentricribsofequalstrength,andintheasymmetricalribs patternintheanteroventralpartofthecarapace:theouterribs turn toward the ventral margin, and those in the posteroventral part join them at an acute angle.

Fig.9. A, B. Nandania asymmetrica ( Koch,1967) A 1, A 2.LeftvalveZPALO.52/83inlateralandobliqueventralviews;sampleP−20. B 1, B 2.Rightvalve ZPALO.52/82inlateralandobliquedorsalviews;sampleP−120. C–E. Richterina (Volkina) zimmermanni ( Volk,1939) . C.LeftvalveZPALO.52/84inlateralview;sampleP−18.D1−D2.RightvalveZPALO.52/59inlateralandobliqueventralviews;sampleP−83. E 1, E 2.RightvalveZPALO.52/38inlateral andobliqueventralviews;sampleP−15. F. Nehdentomis pseudorichterina ( Matern,1929) .InternalmouldofleftvalveZPALO.52/47inlateralview;sample P−18. G. Franklinella (Franklinella) cf. calcarata ( Richter, 1856) . Right valve ZPALO.52/ 16 in lateral view; sample P−13. Scale bars 500 µm.

Material.— 25 specimens.

Description.—Thelateraloutlineisbroadlyoval.Thedorsal and ventral margins are gently curved. The posterior end is more broadly rounded than the anterior end. The surface bearsapproximately18−20ribsofequalstrength.Theinner ribs run concentrically and are slightly lenslike. The outer ribsareparalleltothedorsal,anteriorandposteriormargins. In the anteroventral part of the carapace, the outer ribs turn toward the ventral margin, and those in the posteroventral part join them at an acute angle.

Remarks.—Thisspeciesismostsimilarintheribbingpattern to Rabienella? barrandei ( Richter, 1869) .

Range and occurrence.—ThisspeciesoccursinthelateFrasnian of the Płucki section (samples P−45, P−47), below the UKWH, E. (E.) splendens Zone.

Figures

Fig. 7. A, B. Entomoprimitia (Entomoprimitia) nitida (Roemer, 1850). A1–A3. Right valve ZPAL O.52/32 in lateral, oblique ventral and oblique dorsal views;sampleP−120. B1, B2.CarapaceZPALO.52/25inrightlateralandobliqueventralviews;sampleP−14. C, D. Rabienella? lagowiensis sp.nov. C1, C2. Rightvalve,holotypeZPALO.52/76inlateralandobliqueventralviews;sampleP−47. D1, D2.CarapaceZPALO.52/60inrightlateralandobliqueventral views;sampleP−a. E, F. Entomoprimitia (Entomoprimitia) sp.aff. E.(E.) wildungensis (Matern,1929). E.CarapaceZPALO.52/68inrightobliqueventral view; sample P−112. F1, F2. Right valve ZPALO.52/37 in lateral and oblique ventral views; sample P−120. Scale bars 500 µm.