Lampanyctus profestus Schwarzhans, 2019

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

Lampanyctus profestus Schwarzhans, 2019

Fig. 7K-M

Lampanyctus profestus 2019 Lampanyctus profestus - Schwarzhans: figs 54.5-9.

Lampanyctus profestus 2021 Lampanyctus profestus Schwarzhans, 2019 - Schwarzhans and Nielsen: fig. 8g.

Material.

1 specimen (SMF PO 101.123); Miya River at Numa, Tsuyama City, Okayama Prefecture, Takakura FM, level MS 36, late Burdigalian, diatom zone 3A-3B .

Discussion.

A single otolith from the Takakura Formation differs from the much more common L. lenticularis described above in the shallower, depressed dorsal rim; the much smaller caudal colliculum expressed in the ratio OCL:CCL of 2.35; and a nearly completely flat inner face. The OL:OH (1.1) and OCL:CCL (2.35) ratios are well within the range of diversity observed in the type specimens from the early Miocene of New Zealand (OL:OH = 1.1-1.25; OCL:CCL = 2.0-2.5). The species has recently also been identified from the Burdigalian of Chile ( Schwarzhans and Nielsen 2021) and thus, although generally uncommon, appears to represent another myctophid species with an antitropical distribution pattern in the early to middle Miocene of the Pacific Ocean.

Figures

Figure 7. A-J: Lampanyctus lenticularis sp. nov., Tsuyama City, Takakura Formation; B-D: holotype, SMF PO 101.121, level h; A, E-J: paratypes, SMF PO 101.122, levels f, g, h, j; K-M: Lampanyctus profestus Schwarzhans, 2019, SMF PO 101.123, Tsuyama City, Takakura Formation, level MS 36; N-V: Lampanyctus tsuyamaensis sp. nov., Tsuyama City, Takakura Formation; N-P: holotype, SMF PO 101.124, level MS 15; Q-V: paratypes, SMF PO 101.125, levels MS 15, MS 36, MS 90; W-AJ: Stenobrachius ohashii sp. nov.; W-Y: holotype, SMF PO 101.126, Yatsuo machi, Toyama City, Kurosedani Formation, level K 5; Z-AB, AF-AJ: paratypes, SMF PO 101.127, Tsuyama City, Takakura Formation, levels MS 15, MS 70; AC-AD: paratype, SMF PO 101.128, Niimi City, Bihoku Group; AE: paratype, SMF PO 101.129, Fuchu machi, Toyama City, Higashibessho Formation, level H 21; AK-AM: Stenobrachius leucopsarus (Eigenmann & Eigenmann, 1890), Recent, coll. Schwarzhans, leg. Fitch, off California; AN-AO: Stenobrachius nannochir (Gilbert, 1890), Recent, NSMT-P. 63309, 36 ° 28 ' N, 141 ° 10 ' E.