A new dallasiellid shark from the lower Campanian (Upper Cretaceous) of Sweden

IF 1.2 4区地球科学 Q2 GEOLOGY

Gff Pub Date : 2022-04-03 DOI:10.1080/11035897.2022.2097737

Mikael Siversson, P. Cederström, H. E. Ryan

引用次数: 1

Abstract

ABSTRACT Examination of isolated shark teeth from the uppermost lower Campanian Gonioteuthis quadrata scaniensis Zone of southern Sweden revealed the presence of a rare, previously undescribed lamniform shark. The unusually small-sized anterior teeth, variable presence of a short and shallow median groove, cusplet shape and outline of posterior teeth indicate a dallasiellid affinity and the species is formally described as Dallasiella brachyodon sp. nov. It is the youngest record of dallasiellids and adds to the extraordinarily high diversity of lamniform sharks in the uppermost lower Campanian of the Kristianstad Basin. Over its 18 Ma range, Dallasiella appears to have increased in body size and developed teeth with relatively broader cusps, indicating enhanced capabilities for tackling larger prey.

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瑞典下坎潘阶（上白垩纪）的一种新的dallasielid鲨鱼

摘要：对瑞典南部坎帕尼阶最上层下层Goniotothis quadrata scaniensis区的孤立鲨鱼牙齿进行检查，发现了一种罕见的、以前未描述的片状鲨鱼。异常小的前牙、可变的短而浅的中槽、尖牙形状和后牙轮廓表明具有达拉斯亲和性，该物种被正式描述为短柄Dallasiella brachyodon sp.nov。这是最年轻的dallasiellids记录，并增加了克里斯蒂安斯塔德盆地最上层下坎帕尼亚阶lamuniform鲨鱼的极高多样性。在18 Ma的范围内，Dallasiella的体型似乎有所增加，牙齿的尖端相对较宽，这表明它对付较大猎物的能力有所增强。

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来源期刊

Gff 地学-地质学

CiteScore

2.80

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： GFF is the journal of the Geological Society of Sweden. It is an international scientific journal that publishes papers in English covering the whole field of geology and palaeontology, i.e. petrology, mineralogy, stratigraphy, systematic palaeontology, palaeogeography, historical geology and Quaternary geology. Systematic descriptions of fossils, minerals and rocks are an important part of GFF''s publishing record. Papers on regional or local geology should deal with Balto-Scandian or Northern European geology, or with geologically related areas. Papers on geophysics, geochemistry, biogeochemistry, climatology and hydrology should have a geological context. Descriptions of new methods (analytical, instrumental or numerical), should be relevant to the broad scope of the journal. Review articles are welcome, and may be solicited occasionally. Thematic issues are also possible.