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| Bakel, Barry W.M. van; Jagt, John W.M.; Fraaije, René H.B.. |
| Upper Cretaceous strata in the type area of the Maastrichtian Stage (SE Netherlands, NE Belgium) have yielded comparatively abundant and diverse raninid assemblages (Collins et al., 1995; Fraaye & van Bakel, 1998). To date, seven species are known: Eumorphocorystes sculptus, Pseudoraninella muelleri, Lyreidina pyriformis, Raninoides? quadrispinosus, Raniliformis chevrona, Raniliformis prebaltica and Raniliformis occlusa. These occur mainly from the upper portion of the Maastricht Formation [Emael, Nekum and Meerssen members, Belemnitella junior and Belemnella (Neobelemnella) kazimiroviensis biozones]. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Homonymy; Crustacea; Ichnofossils; Notopus. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/534340 |
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| Swen, Krista; Fraaije, René H.B.; Zwaan, Gijsbert J. van der. |
| A biometric study of chelae of the burrowing shrimp Protocallianassa faujasi (Desmarest, 1822), from the late Maastrichtian of the Maastrichtian type area, The Netherlands, has revealed three morphotypes. These types are interpreted as sexual dimorphs (male and female) and earliest ecdysis stages (immature male). Among the studied material are fifteen specimens of a new Cretaceous callianassid, Corallianassa acucurvata new species, one specimen provisionally assigned to the genus Calliax and a callianassid from the Danian. Burrows preserving callianassid chelae in situ are discussed. Based on burrow morphology a suspension feeding mode of life for P. faujasi is inferred, whereas C. acucurvata n. sp. probably was an active omnivorous analogue of its closest... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Thalassinoidea; Cretaceous; Polymorphy; New species. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/534371 |
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