comment on this calibration
Scutigeromorpha
Lineage (NCBI):
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» Eukaryota
» Opisthokonta
» Metazoa
» Eumetazoa
» Bilateria
» Coelomata
» Protostomia
» Ecdysozoa
» Panarthropoda
» Arthropoda
» Mandibulata
» Myriapoda
» Chilopoda
» Scutigeridae
| node name Scutigeromorpha Look for this name in NCBI Wikipedia Animal Diversity Web | ||
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recommended citations Wolfe et al. 2016 |
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node minimum age 112.6 Ma This fossil was recovered from the Nova Olinda Member of the Crato Formation in the Araripe Basin, northeastern Brazil. This unit is generally agreed to be around the Aptian/Albian border (Martill et al., 2007). Batten (2007) suggests that if assemblages in the upper layers are consistent across the lower layers, a late Aptian date should be considered.The Crato formation has been dated using palynomorphs (Pons et al.,1990) to the Aptian, though an accurate date for the Nova Olinda Memberis not available. The upper boundary of the Aptian, at 113.0 Ma ±0.4 Myr, gives a minimum date of 112.6 Ma. | ||
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node maximum age 521 Ma A soft maximum age is obtained from the oldest mandibulate, Y. dianensis, which was recovered from the Yu'anshan Formation at Xiaotan section, Yongshan, Yunnan Province, attributed to the Eoredlichia–Wutingaspis Biozone (Zhang et al., 2007). Chinese Cambrian stratigraphy has been revised substantially and the Eoredlichia –Wutingaspis Biozone is no longer recognized (Peng, 2003, 2009). However, Eoredlichia is known to co-occur with Hupeidiscus, which is diagnostic of the Hupeidiscus-Sinodiscus Biozone, which is formally recognized as the second biozone of the Nangaoan Stage of the Qiandongian Series of the Cambrian of China (Peng and Babcock,2008). The Nangaoan is the proposed third stage of the Cambrian System for the International Geologic Timescale (Peng et al., 2012a).Thus, a soft maximum constraint can be established on the age of the lower boundary of the Nangaoan, which has been dated to 521 Ma (Peng et al., 2012a; Peng and Babcock, 2008) | ||
| primary fossil used to date this node | ||
SMNS 64275 | ||
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phylogenetic justification
Wilson (2001) assigned F. tenax to the extant family Scutigeridae based on the proportions of its antennal articles and its styliform male gonopods. Paired spine-bristles on the tibia of the second maxilla (synapomorphy of Pselliodidae + Scutigeridae) are consistent with this interpretation (Edgecombe, 2011). These affinities place the genus in crown-group Scutigeromorpha. |
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phylogenetic reference(s)
Wilson, H.M., 2001. First Mesozoic scutigeromorph centipede, from the Lower Cretaceous of Brazil. Palaeontology 44, 489–495.
Edgecombe, G.D., 2011. Chilopoda–the fossil history. Treatise on Zoology-Anatomy, Taxonomy, Biology. The Myriapoda, pp. 355–361.
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| tree image (click image for full size) | ||
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Figure 8 from Wolfe et al. (2016).
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