Diogenichthys aguilerai Schwarzhans, 2013

Schwarzhans, Werner, Ohe, Fumio, Tsuchiya, Yuki & Ujihara, Atsushi, 2022, Lanternfish otoliths (Myctophidae, Teleostei) from the Miocene of Japan, Zitteliana 96, pp. 103-134 : 103

Diogenichthys aguilerai Schwarzhans, 2013

Fig. 5A-C

Diogenichthys aguilerai 2013b Diogenichthys aguilerai - Schwarzhans: pl. 2, figs 4-5.

Diogenichthys aguilerai 2019 Diogenichthys aguilerai Schwarzhans, 2013 - Schwarzhans: fig. 50.12.

Diogenichthys aguilerai 2021 Diogenichthys aguilerai Schwarzhans, 2013 - Schwarzhans and Nielsen: fig. 7a-d.

Material.

A single specimen (SMF PO 101.112) from Miya River at Oda, Tsuyama City, Okayama Prefecture, late Burdigalian, diatom zone 3A-3B, Takakura FM, level MS 04.5.

Discussion.

Diogenichthys aguilerai is an unspectacular and small high-bodied myctophid otolith with a ratio OL:OH of 0.95-1.05. Its ventral rim is regularly curved and smooth; the dorsal rim is highest slightly behind its middle. Rostrum, excisura, and antirostrum are all small. The inner face is flat, and the outer face is distinctly convex and smooth. The narrow sulcus exhibits a slightly longer ostium than cauda, with the latter being underlain by a very long, anteriorly extended pseudocolliculum.

Diogenichthys aguilerai was apparently widespread during the early Miocene (Aquitanian and Burdigalian) but usually not common, with the exception of a recent find in the late Burdigalian of Chile ( Schwarzhans and Nielsen 2021). It was originally described from Angola ( Schwarzhans 2013b) but is also known from New Zealand ( Schwarzhans 2019) and possibly also from the Caribbean (as Diogenichthys sp. in Schwarzhans and Aguilera 2013).

Figures

Figure 5. A-C: Diogenichthys aguilerai Schwarzhans, 2013, SMF PO 101.112, Tsuyama City, Takakura Formation, level MS 04.5; D-L: Myctophum murbani (Weinfurter, 1952); D-I, K-L; SMF PO 101.113, Tsuyama City, Takakura Formation, levels MS 15, MS 27, MS 52, h, J) SMF PO 101.114 Mizunami City, Oidawara Formation; M-O: Myctophum sp., col. Tsuchiya, Ichishi Group; P-Z: Protomyctophum ahunga Schwarzhans, 2019, SMF PO 101.115, Tsuyama City, Takakura Formation, levels MS 15, MS 22, MS 36, h.