Hoplobrotula Gill 1863

• Main Authors: Schwarzhans, Werner, Mors, Thomas, Engelbrecht, Andrea, Reguero, Marcelo, Kriwet, Jurgen
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Ophidiiformes; Ophidiidae; Hoplobrotula; Antarc*; Antarctica; Seymour Island
• Online Access: https://doi.org/10.5281/zenodo.10883172; http://treatment.plazi.org/id/041B87CAFFA8FFFCD676FB5FE6DDDFC0

Hoplobrotula ? antipoda sp. nov. (Figs 5A—C, 6O, P) Material. Holotype: NRM-PZ P.15984 (Figs 5A, B, 6O, P). Paratype: NRM-PZ P.15985 (Fig. 5C). Occurrence. Telm 5 unit; ‘ Natica horizon’, Cucullea I member, La Meseta Formation, late Ypresian, early Eocene. Site IAA 1/90, Seymour Island, Antarctica. Etymology. Named for its occurrence on the opposite side of the globe when compared to other Eocene species of the genus, known from Europe. Diagnosis. OL:OH = 1.75—1.95. Dorsal rim with low, broad predorsal lobe. OCL: CCL = 2.5—2.75. Sulcus and particularly ostium very narrow. Description. Relatively small, elongate and thin otoliths up to 4 mm in length (holotype 3.9 mm long). OH:OT = 2.6. Dorsal rim rather regularly and gently curved with broad, not much expanded predorsal lobe. Ventral rim regularly curved, deepest slightly in front of its middle. Anterior tip tapering, inferior, below level of ostium; posterior tip narrow, tapering, at level of cauda. All rims smooth. Inner face moderately convex, smooth, with very narrow, shallow, slightly supramedian sulcus. Ostium very narrow, about 2.5 to 3 times the length of cauda, reaching close to anterior rim of otolith; cauda short, slightly deepened, with rounded tip, terminating at some distance from posterior rim of otolith. Ventral margin of sulcus distinctly indented at ostial—caudal joint. Dorsal depression indistinct, small; ventral furrow faint, fading towards posterior, close to ventral rim of otolith. Outer face slightly convex, less than inner face, smooth. Remarks. Hoplobrotula ? antipoda is a typical representative of the many small ophidiid otoliths, which are so common in the Palaeogene. It clearly differs from the species described from the Eocene of Europe such as Hoplobrotula biscaica (Sulc, 1932), H. greenwoodi Nolf, 1980, H. robusta Nolf, 1980, H. melrosensis (Dante & Frizzell, 1965), H. waltoni (Schubert, 1916), as well as Ampheristus toliapicus Konig, 1825 and A. lerichei (Stinton & Nolf, 1970) (see Nolf 1980, 2013 for figures) by the very ...