Euchondrocephali Lund and Grogan, 1997 Euchondrocephali
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publication ID |
https://doi.org/ 10.4202/app.00084.2014 |
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persistent identifier |
https://treatment.plazi.org/id/251B879F-FFC4-FFB6-FC86-326D0A20F9FB |
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treatment provided by |
Felipe |
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scientific name |
Euchondrocephali Lund and Grogan, 1997 Euchondrocephali |
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Subclassis Euchondrocephali Lund and Grogan, 1997 Euchondrocephali gen. et sp. indet.
Figs. 8F View Fig , 14D View Fig .
Material.—Three teeth from upper Viséan of Cawdor Quarry, Matlock, Derbyshire, England, UK (samples Cawdor 1, 3 and 5), two from upper Viséan of Todowa Grząba, north of Ostrówka Quarry, Gałęzice Region, Holy Cross Mountains, Poland (sample TG-D); NHMUK PV P73287, ZPAL P.IV/233.
Description and remarks.—Several fragments of possible euchondrocephalan teeth were found in the studied material. They are seriously damaged and usually only dome-like pieces of crowns ( Fig. 8F View Fig ), built of tubular dentine, suggest their identity. The best preserved tooth was found at Todowa Grząba ( Fig. 14D View Fig ). It is orodont-like, elongated mesio-distally, with a euselachian base and a crown composed of a dome-like (at least in the present state) median cusp and lateral wings with a mesio-distal ridge and numerous ridges transversal to it on the labial and lingual sides. The tooth is somewhat similar to Orodus minutus Newberry and Worthen, 1866 , known from the Mississippian of Iowa, USA and Bristol area, England, UK (see Ginter et al. 2010: fig. 102G, H).
Chondrichthyan scales and branchial denticles
There are several types of scales in the studied material: typical composite ctenacanth scales (sensu Reif 1978) with the odontodes directed posteriorly and arranged rather irregularly, and the convex bases showing a common pulp cavity ( Fig. 15A, F, I View Fig ); hybodont scales with vertically arranged odontodes ( Fig. 15B, O View Fig ); as well as neoselachian? ( Fig. 15G View Fig ) and euchondrocephalan ( Fig. 15H View Fig ) placoid scales. Also, symmoriiform branchial denticles of the “ Stemmatias ” type, both with a single ( Fig. 15D, M View Fig ; “ S. simplex ”) and a double ( Fig. 15E, L, N View Fig ; “ S. bicristatus ”) row of cusps, occur in the samples. They are particularly numerous at Westenfeld and Todowa Grząba.
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