Ceratocyrtis spinosiretis (Takahashi, 1991) Matsuzaki et al., 2015

Plate 10, Fig. 4.

Helotholus histricosa Jørgensen, Benson, 1966, pl. 31, figs. 7–8 (non figs. 4–6).

Ceratocyrtis galeus (Cleve), Nishimura and Yamauchi, 1984, pl. 32, figs. 8, 10–11.

Lampromitra spinosiretis n. sp., Takahashi, 1991, p. 110, pl. 34, figs. 1–2, 7.

Lampromitra spinosiretis Takahashi, Okazaki et al., 2004, pl. 2, figs. 27, 28.

Lampromitra spinosiretis Takahashi, Ikenoue et al., 2012, pl. 3, fig. 15.

Lamprocyrtis nigrinae (Caulet), Tanaka and Takahashi, 2008, pl. 3, fig. 14.

Ceratocyrtis galeus (Cleve), Itaki, 2009, pl. 19, figs. 3–10.

Ceratocyrtis spinosiretis (Takahashi), Matsuzaki et al., 2015, pl. 8, figs. 1–2.

Lampromitra spinosiretis Takahashi, Trubovitz et al., 2020, supplementary data 7.

Remarks. In his original description of this species, Takahashi (1991) listed part of Benson (1996)’s illustration of Helotholus histricosa Jørgensen in the synonymy. Takahashi lists Benson’s plate 31, figs. 6–7 (only) in his synonymy, but upon examination of both sets of plates, it appears there was a typo in Takahashi’s list; Benson (1966) ’s pl. 31, figs. 7–8 are conspecific with Lampromitra spinosiretis Takahashi (1991), pl. 34, figs. 1–2, 7. Benson (1966) ’s pl. 31, fig. 6 is clearly a Pseudodictyophimus specimen, due to its long feet, short thorax, and lack of an axobate. Therefore, we have indicated the corrected synonymy citation in the list above. Matsuzaki et al. (2015) transferred this species from Lampromitra to Ceratocyrtis due to the skeletal structure of the cephalis in Takahashi (1991) ’s paratype specimen. Here we follow Matsuzaki et al. (2015) ’s genus transfer, and add that the absence of three thoracic ribs and presence of an axobate are additional evidence that this species belongs in Ceratocyrtis rather than Lampromitra.

Range. Late Miocene—Middle Pleistocene, EEP (Table 1).