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Natuurhistorisch Maandblad. 99 Foraminifera

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Natuurhistorisch Maandblad. 99 Foraminifera NATUURHISTORISCH MAANDBLAD. 99 FORAMINIFERA FROM THE CRETACEOUS OF rather slow, for instance in Gavelinopsis bem- SOUTHERN LIMBURG, NETHERLANDS. XXI. bix, so that in that species the increase is of no stratigraphic significance. THE SPECIES OF THE GENERA GAVELINELLA Short description of the species. AND GAVELINOPSIS IN THE CRETACEOUS ABOVE THE HERVIAN IN GERMANY, HOL- GAVELINOPSIS PERTUSA (Marsson). LAND AND BELGIUM, AND THE INCREASE OF THE DIAMETERS OF THEIR PORES AS Fig. 3. INDICATION FOR STRATIGRAPHIC LEVELS Truncatulina pertusa Marsson, 1878, p. (INCLUDING THE DEVELOPMENT OF THE 166, pi. 4, fig. 35. PORES OF SOME STENSIONIA-SPECIES). by J. 1IOFKER Test rounded to slightly oblong. At the ventral side only the chambers of the last formed THE GENERA GAVELINELLA AND whorl clearly visible, the distinct somewhat curved sutures, depressed between the last GAVELINOPSIS (Figs. 1•18). formed chambers and thickened to limbate be- tween the older chambers. Umbilicus wide open Both genera belong to the Gavelinellidac. and hollow, with very narrow lips. Pores distinct In Gavelinella the umbilicus of the ventral side in all chambers. Margin rounded, periphery is open, whereas in Gavelinopsis it is filled up only slightly lobulate at the last formed cham- by a chalk knob, protuding from the initial part bers, else smooth. At the dorsal side all cham- of the test. bers visible, with slightly backward curved In both genera the aperture consists of two sutures which especially between the last formed parts, a sutural slitlike opening at the ventral chambers are distinct and limbate. Pores not suture, becoming more or less marginal in highly developed on the dorsal side in the forms of the developed forms, and an umbilical opening beginning of the development of the species, but which is connected with the sutural one and is at the end of the development also found in the covered by short lips which many cases fuse walls of the last formed chambers of the test. together at the ventral side around the umbilical Number of chambers 10•11 in the last whorl. area into a spirally ridge. In South Limburg the diameter of the tests is In both genera in the older forms only the comparatively small, about 0,7 mm in the largest ventral side shows pores, whereas the dorsal specimens, thickness then 0.2 mm. side is poreless; but in highly advanced species The species occurs, never common, from the pores may appear also at the dorsal side, at Cr 3 a up into the Cr 4; it may be found very least in the later formed chambers. rarely in the Mb, but not higher up. Though In both genera the septal walls are double. Visser mentions it from the uppermost Md, Primitive forms show slight difference be- this must be an error. tween ventral and dorsal sides, since the ventral side and the dorsal side show all chambers, GAVELINELLA CLEMENT I AN A arranged into a spiral which is trochoidal. But (d'Orbigny). Fig. 2. in advances species the chambers on the dorsal side may become involute up to reaching the Discorbis clementiana d'Orbigny, 1840, centre of the test. p. 37, pi. 3, figs. 23•25. A very striking fact is the increase of the size of the pores during the evolution of each Ventral side with a rather narrow umbilical species, always beginning with pores of about hollow. The chambers of the last formed whorl 1•2 JH diameter, and increasing up to 8 p. dia- only visible at the ventral side. Sutures distinct, meter. When that size is reached, the species depressed in the last formed chambers, but disappears. In most species the increase of pores strongly limbate in the former chambers by a is relatively rapid, since the whole development secundary thickening of the chalk substance. takes about a single period of the Upper Cre- Umbilical lips strongly protruding over the um- taceous; but in some species the increase is bilical hollow, forming a star-like figure. Last 100 NATUURHISTORISCH MAANDBLAD. formed chambers inflated, and thus the margin tween later chambers, slightly curving back- lobulated here. Ventral or marginal aperture wards. Ventral side somewhat flattened. Pores often with a slight lip. Pores at the ventral side at ventral side small but distinct. At the dorsal distinct. Margin strongly rounded. Dorsal side side the chambers reach towards the centre of always without pores, with all chambers visible, the test, leaving in some cases a small clear but the initial part often covered by irregular central part free. Here the sutures are slightly bosses of chalk. Sutures strongly curving back- depressed, narrow, and slightly curved. Peri- wards, limbate by irregular bosses of chalk. phery very slightly lobulate or smooth. Margin Number of chambers in most cases 7. rounded. The typical somewhat spiral umbilicus Diameter 0,9 to 1 mm. Thickness 0,37• at the ventral side is the most striking feature. 0,4 mm. Number of chambers high, about 10•11 in the The species occurs only in the Cr 3 a, where last formed whorl. it is common, and in the Hervian, in the lower Diameter of test about 0.40•0.50 mm, thick- part of it. ness about 0,20 mm. The species begins its development in the GAVELINELLA PERT US A Upper Maestrichtian, the Cr 4, and develops MAESTRICHTIENSIS (Hofker). Fig. 4. during the whole M up into the Upper Md. Gavelinella pertusa maestricktiensis Hof- GAVELINOPSIS COM PLAN AT A ker, Pal. Zeit., 30, 1956, p. 73, fig. 60. (R e u s s). Figs. 7, 8. This variety develops in the Lower Maes- Anomalina complanata R e u s s, 1851, p. 20, trichtian from the typical species. It must be a pi. 3, fig. 3. variation, since the pores do not decrease. Test rather small for the species; ventral side with Test rounded. Ventral side somewhat flatten- slightly curved sutures between the chambers, ed, with slightly curved sutures directed back- sutures thickened between older chambers. Um- wards. Sutures filled up with chalk but not bilical lips fusing together forming a narrow limbate. Umbilical lips forming a spiral thicken- border over the large umbilicus. Pores at ventral ed rim around the flatly filled umbilicus. Only side in all chamberwalls, distinct. Chambers, the chambers of the last 1 x/i whorl visible on especially the later ones, strongly inflated, form- the ventral side. Pores in all chamberwalls, often ing a lobulate periphery. Margin strongly round- distinct. Periphery smooth or very slightly lobul- ed. Chambers at the dorsal side not reaching ate at the last few chambers. Margin rounded the centre, but more involute than in the real to slightly compressed. Dorsal side with de- species. At the dorsal side pores in the younger pressed strongly curved sutures. chambers. Diameter of tests 0,55 mm, thickness No pores at the dorsal side. 0,25 mm. Number of chambers in the last formed This variety is found from the Cr 3 c upwards whorl 9. into the Cr 4 and rarely in the lower Mb. Diameter about 0,65 mm, thickness about 0,35 mm. The ventral and dorsal sides equally GAVELINELLA UMBILICATIFORMIS convex. Hofker. Figs. 10•13. This species is found in South-Limburg in the Cr 3 a, Cr 3 b et Cr 3 c. Gavelinella umbilicatiformis Hofker, 1955, Natuurhist. Maandblad Limburg, 44, p. 120, G A V E LIN OPS IS BAR TENS TEINI figs. p. 122. Hofker. Fig. 9. Test small, dorsal side with chambers leaving Gavelinopsis bartensteini Hofker. Pal. a narrow umbilicus free, which in most cases Zeit, 30, 1956, p. 74, fig. 64. is surrounded by a spirally formed rim, formed by the fusing umbilical lips of the chambers. Test differing from G. complanata in the Sutures slightly depressed at the ventral side higher inflated chambers, and the not so cur- but often becominug limbate by thickening be- ving sutures. At the ventral side the umbilical NATUURHISTORISCH MAANDBLAD. 101 filling is in most cases not spirally, the periphery with nearly radiant sutures which may be is strongly lobulated, the sutures not so oblique slightly curved. Umbilical apertures visible as a as in G. complanata. Pores in all chambers at narrow canal between the chambers and the the ventral side. At the dorsal side the sutures knob. Pores very distinct. At the dorsal side are depressed, the sutures nearly straight or no pores are found, and the sutures of the cham- very slightly curved, and pores are visible also bers are indistinct, covered mostly by a very at the dorsal side in most of the chambers. large and bulging central chalk knob which is Number of chambers 8•9. smootly finished with the surface. Margin Diameter about 0,60 mm, thickness 0,35 mm. rounded to nearly keeled, periphery smooth. Both sides are equally convex. Diameter of tests up to 1 mm or even slightly This species develops in South-Limburg in more, thickness about 0,50 mm. the upper part of the Cr 3 b, the lower part of Number of chambers about 10. the Cr 3 c and ends its development in the This species is found in the Cr 3 a and Cr 3 b, upper Cr 4 or Ma. It is typical for the whole at the top of which it extinguishes; never Maestrichtian period, but does not occur in the common. M, or K. GAVELINOPSIS INVOLUTA (Reuss). GA VELINOPSIS PLANA (S c h ij f s m a). Figs. 17, 48. Fig. 1. Rotalia involuta Reuss var. of Maestricht, 1861, pi. 2, fig. 4. Cibicides voltziana (d'O r b i g n y) var. plana Schrij f sma, 1946, p.
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