Diaphus sp. 2

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

Diaphus sp. 2

Fig. 9AH-AJ

Material.

2 specimens (figured specimen SMF PO 101.146), Okuna, Mizunami City, Gifu Prefecture, Oidawara FM, early Langhian, diatom zone 4A.

Discussion.

Two very compressed, nearly round otoliths differ from the common D. hataii in the low index OL:OH of 1.1 and the distinctly widened ostium. The specimens share with D. hataii the short rostrum, the number of denticles along the ventral rim (9), and the expanded predorsal lobe. It most likely represents a separate species, but more specimens will have to be obtained before a reliable diagnosis can be established.

Subfamily Gymnoscopelinae Paxton, 1972 (sensu Martin et al. 2018)

Figures

Figure 9. A-I: Diaphus cassidiformis (Frost, 1933), SMF PO 101.138, Yatsuo, Toyama City, Kurosedani Formation, level K 5; J-AC: Diaphus hataii Ohe & Araki, 1973; J-L: SMF PO 101.139, Mizunami City, Oidawara Formation; M-N, Q-V: SMF PO 101.140, Tsuyama City, Takakura Formation, levels MS 06, MS 07, MS 52, MS 90; O-P: SMF PO 101.141, Fuchu machi, Toyama City, Higashibessho Formation, level H 20; W-AA: SMF PO 101.142, Makino River, Iga City, Makino Formation, level A 1; AB-AC: SMF PO 101.143, Inabacho, Tsu City, Katada Formation, level ML 2305; AD-AG: Diaphus biatlanticus (Weiler, 1959); AD-AF: SMF PO 101.144, Mizunami City, Oidawara Formation; AG: SMF PO 101.145, Tsuyama, Takakura Formation, level h; AH-AJ: Diaphus sp. 2, SMF PO 101.146, Mizunami City, Oidawara Formation.