Icriospathodus collinsoni
Creators: name: Leu, Marc
name: Bucher, Hugo
name: Vennemann, Torsten
name: Bagherpour, Borhan
name: Ji, Cheng
name: Brosse, Morgane
name: Goudemand, Nicolas
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Ozarkodinida
Gondolellidae
Icriospathodus
Icriospathodus collinsoni

description: Icriospathodus collinsoni (Solien, 1979)
Fig. 25M, O, P
1964 Icriodus; Clark et al., p. 376, pl. 60, fig. 1.
1970 Neospathodus n. sp. G; Haselmüller, p. 45–47, pl. 2, fig. 12a–b.
1971 Neospathodus n. sp. G; Sweet et al., p. 453, pl. 1, figs. 12, 13
*1979 Neospathodus collinsoni n. sp.; Solien, p.302, pl. 3, figs. 10, 12–20
1981 Neospathodus? collinsoni (Solien); Koike, pl. 1, figs. 42–44.
1987 Neospathodus collinsoni (Solien); Zakharov & Rybalka, p. 43–44, pl. 5, figs. 4, 5.
1990 Neospathodus collinsoni (Solien); Metcalfe, p. 136, pl. 1, figs. 6, 7, 17.
1992 Spathoicriodus collinsoni (Solien); Koike, p. 357–361, figs. 11, 12.13–12.42, 12.44, 12.47–12.50, 13.8–13.37.
1995 Icriospathodus collinsoni (Solien); Orchard, p. 113, fig. 2.22–2.24.
2005 Icriospathodus collinsoni (Solien); Orchard, p.96, fig. 22A
2007 Icriospathodus collinsoni (Solien); Orchard p.96, fig. 2
2007 Icriospathodus collinsoni (Solien); Lucas & Orchard, p. 123, figs. 7.4–7.7, 7.13–7.15.
2011 Icriospathodus collinsoni (Solien); Ji et al., p. 221, figs. 5a–5c.
2014 Icriospathodus collinsoni (Solien); Maekawa & Igo in Shigeta et al., p. 260, figs. 186.10–186.22, 187–191, 192.1–192.6.
2015 Icriospathodus collinsoni (Solien); Chen et al., p.113, figs. 9.1–9.4.
2015 Icriospathodus collinsoni (Solien); Yan et al., p. 240, figs. 3.5, 3.6.
2016 Icriospathodus collinsoni (Solien); Komatsu et al., p. 69, fig. 5.9.
2018 Icriospathodus collinsoni (Solien); Maekawa in Maekawa et al., p. 49–51, figs. 28.5–28.10, 29.1–29.7.
2019 Icriospathodus collinsoni (Solien); Chen et al., fig. 6, nr. 10–12.
2019 Icriospathodus collinsoni (Solien); Liu et al., p. 14, pl. 4, figs. 6–8.
2021 Icriospathodus collinsoni (Solien); Chen et al., figs. 4.9–11.
Number of specimens:>40
Description. A robust segminate P 1 element. Te upper edge bears biserial or/and ridge-like denticles. Te width of the denticles is usually longest in the middle part to the posterior third. Te basal cavity shows a lot of variation, but is mostly asymmetrical.
Remarks. Koike (1992) showed a wide range of intraspecific variation within this species (see below). Te two rows of nodes on the upper margin and the pairs of nodes connected by a ridge are diagnostic features that are easy to determine and miss-identification of even broken elements is unlikely. P 1 elements of Eurygnathodus are superficially similar but they are scaphate, not segminate.
Occurrence. I. collinsoni indicates the early Spathian worldwide and generally co-occurs with the Tirolites and Columbites beds. USA: Idaho, (Zone 11, Sweet et al., 1971), Utah (Taynes formation, Solien, 1979), Nevada (Lucas & Orchard, 2007), South China (Chen et al., 2015; Ji et al., 2011), Vietnam (Bac Tuy formation, Komatsu et al., 2016; Shigeta et al., 2014), Oman (Orchard, 1995), Primorye (Zakharov & Rybalka, 1987), Japan (Maekawa et al., 2018), Malay Peninsula (Metcalfe, 1990).
description: Published as part of Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas, 2022, A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China, pp. 1-61 in Swiss Journal of Palaeontology (19) (19) 141 (1) on page 43, DOI: 10.1186/s13358-022-00259-x, http://zenodo.org/record/12000082