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Aptea retirugosa
From Fensome et al., 2019:
Aptea? retirugosa, (He Chengquan, 1991, p.56, pl.8, fig.11) Fensome et al., 2019a, p.17.
Holotype: He Chengquan, 1991, pl.8, fig.11; Fensome et al., 2019a, fig.12C.
Originally Canningia; subsequently Kallosphaeridium, thirdly Canningia?, fourthly (and now) Aptea?.
Questionable assignment; Fensome et al. (2019a, p.17). Fensome et al. (2019a, p.17) recommended that this species be restricted to the holotype.
Age: Late Cretaceous.
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Comment Fensome et al., 2019a:
1991 Canningia retirugosa He Chengquan, p. 56; pl. 8, fig. 11.2009 Kallosphaeridium retirugosum (He Chengquan) He Chengquan et al., p. 164.2016 Canningia? retirugosa He Chengquan; Wood et al., p. 69–71.
Comments. This species was originally described in Chinese with a single illustration, which appears to show an areoligeracean with linear ornament. Thus, it does not belong in Kallosphaeridium, which is a gonyaulacacean with five climactal paraplates (Jan du Chêne and Adediran Citation1985, Wood et al. Citation2016). Wood et al. (Citation2016) tentatively retained this species in Canningia, but as a cyst with a single wall layer and probably linear ornament (although possibly affected by corrosion) this species better fits the definition of Aptea. Hence, we questionably transfer it to Aptea, but recommend that the name be restricted to the holotype, pending further study.
Aptea? retirugosa, (He Chengquan, 1991, p.56, pl.8, fig.11) Fensome et al., 2019a, p.17.
Holotype: He Chengquan, 1991, pl.8, fig.11; Fensome et al., 2019a, fig.12C.
Originally Canningia; subsequently Kallosphaeridium, thirdly Canningia?, fourthly (and now) Aptea?.
Questionable assignment; Fensome et al. (2019a, p.17). Fensome et al. (2019a, p.17) recommended that this species be restricted to the holotype.
Age: Late Cretaceous.
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Comment Fensome et al., 2019a:
1991 Canningia retirugosa He Chengquan, p. 56; pl. 8, fig. 11.2009 Kallosphaeridium retirugosum (He Chengquan) He Chengquan et al., p. 164.2016 Canningia? retirugosa He Chengquan; Wood et al., p. 69–71.
Comments. This species was originally described in Chinese with a single illustration, which appears to show an areoligeracean with linear ornament. Thus, it does not belong in Kallosphaeridium, which is a gonyaulacacean with five climactal paraplates (Jan du Chêne and Adediran Citation1985, Wood et al. Citation2016). Wood et al. (Citation2016) tentatively retained this species in Canningia, but as a cyst with a single wall layer and probably linear ornament (although possibly affected by corrosion) this species better fits the definition of Aptea. Hence, we questionably transfer it to Aptea, but recommend that the name be restricted to the holotype, pending further study.