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Species Hoploscaphites waagei-angmartussutensis Machalski 2005 | ||||||
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| Discussion / Comments: | ||||||
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Machalski (2005): MATERIAL.- From the Netherlands: a silicone cast of a single specimen from the Ankerport−Curfs quarry (NHMM 1994644, ex Dortangs collection). From Poland: a single specimen from Nasiłów (ZPAL Am. 12/1278 ex Małysiak collection). From Denmark: a silicone cast of a single specimen from the Dan− mark quarry, Ålborg, Jylland (MGUH 27747). DISCUSSION.- Kennedy and Jagt (1998) described two speci− mens from the Maastricht area under the heading Hoplo− scaphites sp. nov. One of these, from the base of the Maastricht Formation as exposed at Blankenberg quarry (Kennedy and Jagt 1998: pl. 2: 10, 11) is here reinterpreted as part of a macroconch of Hoploscaphites pungens (Binkhorst, 1861). Another specimen, NHMM1994644 (Kennedy and Jagt 1998: pl. 2: 1215; see Fig. 20C1, C2), comes from the uppermost part (subunit IVf−6) of the Meerssen Member of the Maastricht For− mation, as exposed at the Ankerpoort−Curfs quarry. It is part of a phragmocone, estimated 55mmin maximum diameter (Ken− nedy and Jagt 1998) with relatively distant, wiry ribs on the adapical 90 sector of the outer whorl (Fig. 20C2). This orna− ment is replaced by dense, flexuous prorsiradiate ribs on the re− mainder of the phragmocone (Fig. 20C2). Kennedy and Jagt (1998) compared their Hoploscaphites sp. nov. to Scaphites (Discoscaphites) waagei Birkelund, 1965 and S. (D.) angmartussutensis Birkelund, 1965, from the upper Maastrichtian of western Greenland (Birkelund 1965; see also Kennedy et al. 1999). They also considered the material from the Maastricht area to represent a new spe− cies, too fragmentary for formal description (Kennedy and Jagt 1998: 164). This view is followed here for specimen NHMM 1994644. Two additional specimens from Poland and Denmark, well comparable to NHMM 1994644, attest to a wider strati− graphic and geographic range of Hoploscaphites sp. ex gr. waagei angmartussutensis. Specimens ZPAL Am. 12/1278 (Fig. 20B1, B2) comes from the upper part of the Kazimierz Opoka as exposed at Nasiłów quarry. This is half a whorl of a spire with proportions and ormament very similar to those of NHMM 1994644 (compare Fig. 20B1 and C2). The only sig− nificant difference between these two individuals is that the Meerssen specimen is much more inflated than that from Nasiłów (compare Fig. 20B2 and C1). This is arbitrarily inter− preted here as the result of intrapopulation variation, taking into account the wide range of this parameter documented for many scaphitids, e.g., in the type material of Hoploscaphites constrictus (J. Sowerby, 1817) from Cotentin (Kennedy 1986). Specimen MGUH27747 was found loose on the lowest ex− ploitation level at the Danmark quarry, which exposes white chalk of the Meonia semiglobularisRuegenella humboldtii Zone (Surlyk 1984: fig. 3). It is a piece of whorl with ribbing similar to that of specimens described above (Fig. 20A). STRATIGRAPHIC AND GEOGRAPHIC RANGE.- Upper Maastrichtian of the Netherlands (Belemnella kazimiroviensis Zone) and Poland (Belemnella kazimiroviensis Zone) and Denmark (Meonia semiglobularisRuegenella humboldtii Zone). |
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| Systematics: | ||||||
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51 Familia Scaphitidae Genus Hoploscaphites Species Hoploscaphites waagei-angmartussutensis |
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| Synonym list: | ||||||
| Machalski (2005): p 1998 Hoploscaphites n sp. sp. . - Kennedy & Jagt : p.163 pl. 2; fig. 12-15 [non pl. 2; fig. 10, 11 = Hoploscaphites pungens]
2005 Hoploscaphites sp. ex gr. waagei-angmartussutensis Machalski. - Machalski : p.682 fig. 20
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| Stratigraphy - relative ages: | ||||||
| upper Maastrichtian: Machalski (2005) |
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| References: | ||||||
Kennedy,W.J.. and Jagt,J.W.M.. (1998): Machalski,M.. (2005): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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