Diaphus cavallonis Brzobohatý & Nolf, 2000

Schwarzhans, Werner, 2023, Geology and stratigraphy of the Neogene section along the Oued Beth between Dar bel Hamri and El Kansera (Rharb Basin, northwestern Morocco) and its otolith-based fish fauna: a faunal inventory for the Early, Swiss Journal of Palaeontology (4) 142 (1), pp. 1-85 : 21-23

publication ID	https://doi.org/10.1186/s13358-023-00268-4
persistent identifier	https://treatment.plazi.org/id/03ED255D-3B24-FFAD-9A05-6BDBFE025406
treatment provided by	Felipe
scientific name	Diaphus cavallonis Brzobohatý & Nolf, 2000
status

Treatment

Figure 12h–l View Fig

2000 Diaphus cavallonis —Brzobohatý & Nolf: pl. 5, Figs. 7–14 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig (see there for further references).

2017 Diaphus cavallonis Brzobohaty & Nolf, 2000 —Agiadi et al.: Fig. 5.14 View Fig .

2022 Diaphus cavallonis Brzobohaty & Nolf, 2000 —Carnevale & Schwarzhans: Fig. 7I View Fig (see there for further references after 2000).

?2022 Diaphus cavallonis Brzobohaty & Nolf, 2000 — Agathangelou et al.: Fig. 3A View Fig .

2022 Diaphus cavallonis Brzobohaty & Nolf, 2000 —van Hinsbergh & Hoedemakers: pl. 8, Figs. 7–18 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig .

Material 146 specimens, figured specimens SMF PO 101.197 , Dar bel Hamri, Zanclean .

Discussion Diaphus cavallonis has 8 to 12 delicate denticles along the ventral rim, according to van Hinsbergh and Hoedemakers (2022), based on more than 1000 specimens from Spain. Schwarzhans & Aguilera (2013) noted 10 to 12 denticles on much fewer specimens, which may reflect the predominant range. In the case of the Moroccan specimens, the denticles are eroded except for few specimens (e.g., Fig. 10i, k, l View Fig ), which show 8–11 denticles. Te Moroccan specimens show a considerable variability in respect to the predorsal rim which can be shallow ( Fig. 12l View Fig ) or expanded ( Fig. 12h, i View Fig ), the shape of the posterior rim which can be rounded ( Fig. 12i View Fig ) or relatively blunt ( Fig. 12l View Fig ) and the opening of the ostium. Te variability appears to be within the range observed in the types of Brzobohatý and Nolf (2000) and figures shown in Schwarzhans & Aguilera (2013) and van Hinsbergh and Hoedemakers (2022). Te specimens currently available to me do not warrant a further investigation of the nature of the species but indicate that a detailed review of its morphologic limit may be required. Diaphus cavallonis was apparently widely distributed in the North Atlantic and the Mediterranean during the Zanclean; the oldest records in the Mediterranean date from the Tortonian ( Lin et al., 2015, 2017). Van Hinsbergh and Hoedemakers (2022) found that D. cavallonis is lacking in the Piacenzian of the Mediterranean and instead is replaced by D. postcavallonis van Hinsbergh & Hoedemakers, 2022 . In contrast, Agathangelou et al. (2022) reported D. cavallonis from the Piacenzian of Cyprus. Diaphus cavallonis is the second largest Diaphus species in Dar bel Hamri, reaching 5 mm in length, surpassed only by D. adenomus (see above) with 6 mm in length.