Cretalamna appendiculata (Agassiz, 1843)
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publication ID |
https://doi.org/ 10.4202/app.2012.0123 |
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persistent identifier |
https://treatment.plazi.org/id/C45E8796-696D-1963-FCE7-39DCFB1FB579 |
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treatment provided by |
Felipe |
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scientific name |
Cretalamna appendiculata (Agassiz, 1843) |
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Cretalamna appendiculata (Agassiz, 1843)
Fig. 7C–I View Fig .
1843 Otodus appendiculatus sp. nov.; Agassiz 1843: 270, pl. 32: 10. 1889 Lamna appendiculata (Agassiz) ; Woodward 1889: 392.
1958 Cretalamna appendiculata (Agassiz) ; Glickman 1958: 530.
Material.—One incomplete specimen from the Ce of Stevns Kridtbrud ( MGUH 29858) and numerous teeth from the Br2 of Faxe at the SNM ( MGUH 29858, MGUH 29859, MGUH 29860, MGUH 1408, GM1992-1 to 6, GM1992-16, GM1992-17) and at Østsjaellands Museum in Faxe ( OESM-10046 -3, OESM- 10046-2, OESM- 10046-4) and in private collections. A majority are, however incomplete.
Description.—Teeth with a broad triangular main cusp, erected in anterior and lower laterals and slanted toward the commissure in upper laterals. The main cusp is elongate and broad, with a convex labial face and convex at the crown-root boundary lingually and tends to flatten apically. Both faces are smooth, with the only exception of the median basal part of the labial face, which displays one or two deep vertical furrows. The cutting edges are continuous down to the base of the main cusp and may be continuous in the lateral cusp, but rarely so in upper laterals. The teeth appear to be slightly labio-lingually curved or flat, with the exception of anteriors, which can be slightly sigmoid in lateral view. The cusplets are often triangular and are either erect or divergent depending on their dental position in the mouth. A few teeth display a small denticle at the lateral extremities, but this is not common. The remaining cusplet is triangular and diverging from the main cusp. The root is only partly preserved, but was bilobed with short rounded lobes. There is a deep basal concavity and the basal face appears to have been flat. The largest specimen, a lower lateral, measured 45 mm in height.
Remarks.— Cretalamna appendiculata is a very long-ranging species, known from the Albian of the Anglo-Franco-Belgian basin to the Lower Eocene of Morocco and with a wide distribution. It is evident that in its current usage it comprises several lineages and a number of species ( Underwood and Cumbaa 2010; Underwood et al. 2011). The high crowned anterior teeth ( Fig. 7C, D View Fig ) closely resemble those from the Maastrichtian of Kanne, Belgium, figured by Herman (1977: pl. 9: 3a, b) as C. appendiculata var. pachyrhiza . However, the more lateral teeth ( Fig. 7G–I View Fig ) appear more robust than those figured by Herman (1977) and may represent an undescribed species. In the light of this, we use the name C. appendiculata in a loose sense, pending a revision and cannot make any accurate conclusions on its specific distribution and evolution.
The spelling of Cretolamna or Cretalamna has been discussed by Siverson (1999: 59) and although Glickman 1958: 570) did spell the name Cretalamna, Cappetta (2012) suggests Cretolamna should be used to avoid confusion, an opinion which we have chosen not to follow here.
Stratigraphic and geographic range.— Cretalamna appendiculata sensu lato occurs in Late Cretaceous: Japan ( Goto et al. 1996), Cenomanian of Spain ( Vullo et al. 2009), Santonian and Campanian of Georgia ( Case et al. 2001), Campanian of Delaware ( Lauginiger and Hartstein 1983), Cenomanian, Campanian–Maastrichtian of Southern France ( Vullo 2005; Vullo et al. 2007), Northern Spain ( Kriwet et al. 2007), and Germany ( Hübner and Müller 2010), Maastrichtian of Madagascar ( Gottfried et al. 2001). Selandian (early Paleocene) of New Jersey ( Case 1996) and Denmark.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Cretalamna appendiculata (Agassiz, 1843)
| Adolfssen, Jan S. & Ward, David J. 2015 |
Cretalamna appendiculata (Agassiz)
| Glickman, L. S. 1958: 530 |
Otodus appendiculatus
| Woodward, A. S. 1889: 392 |