Sexual dimorphism within the stem-group arthropod Isoxys volucris from the Sirius Passet Lagerstätte, North Greenland

Bulletin of the Geological Society of Denmark

¹  Stemmerik, L.¹  Milàn, J.¹  Voigt, S.¹  Klein, H.¹  2016-08-11.¹ 

[1] First record of tetrapod footprints from the Carboniferous Mesters Vig Formation in East Greenland.
©2016 by Bulletin of the Geological Society of Denmark, Vol. 64, pp. 69–76. ISSN 2245-7070.

关键词: Carboniferous;    vertebrate tracks;    Limnopus;    Temnospondyli;    Traill Ø Group;    Mesters Vig Formation.;   

学科分类：地球科学(综合)

来源: Dansk Geologisk Forening

【 摘 要 】

Morphometric analyses carried out on 126 specimens of the early Cambrian (Cambrian Series 2, Stage 3) stem-group arthropod Isoxys volucris from North Greenland reveal a bimodal distribution, where Morphogroup A is characterised by a significantly wider doublure than Morphogroup B. The dimorphism is interpreted as intraspecific variation related to gender (sexual dimorphism), where the relative numbers of individuals within the two morphogroups are equal (ratio 1:1). The discovery of established sexual dimorphism in Isoxys may have implications for the taxonomic discrimination of other stemgroup arthropods within the morphologically diverse and disparate animals of the early Cambrian.

【 授权许可】

Unknown