Bollmannia

Schwarzhans, Werner W. & Aguilera, Orangel A., 2024, Otoliths of the Gobiidae from the Neogene of tropical America, Swiss Journal of Palaeontology (13) 143 (1), pp. 1-129 : 40

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FF8C-FFC3-018C-FAD06759FA98
treatment provided by	Felipe
scientific name	Bollmannia
status

Treatment

Bollmannia View in CoL ? paraguanaensis n. sp.

Figure 21j–m View Fig

Holotype NMB P15551 View Materials ( Fig. 21j View Fig ), late Burdigalian , Cantaure FM, Venezuela, PPP 2545 .

Paratypes 3 specimens: 2 specimens same data as holotype ( NMB P15552-53 View Materials ) ; 1 specimen Tortonian , Tuira FM , Pacific Panama, Darien, PPP 1593 ( NMB P15554 View Materials ) .

Referred specimens 1 specimen late Burdigalian, Cantaure FM , Venezuela, PPP 2546 .

Etymology After the Paraguaná Peninsula, Venezuela, where the type location is situated.

Diagnosis OL:OH = 1.02–1.15. Maximal size 1.55 mm (holotype). Otolith shape nearly rectangular with rounded predorsal, preventral, postdorsal and postventral angles. Otolith thin (OH:OT = 3.3–3.5). Sulcus long, with wide ostium and narrow cauda; OL:SuL = 1.55–1.65. Subcaudal iugum long, relatively narrow. Sulcus inclination angle 15–22°.

Description Otolith size up to 1.55 mm in length (holotype). Dorsal rim relatively low, nearly straight, slightly ascending towards posterior. Postdorsal projection blunt, not projecting beyond postventral angle, not bent outward; preventral angle orthogonal. Ventral rim straight, horizontal. Anterior and posterior rims nearly vertical, posterior rim with weak indentation at its middle. All rims smooth.

Inner face nearly flat. Sulcus sole-shaped, deep, inclined at 15–22°; ostium wide, with moderate ostial lobe, cauda narrow, straight. OL:SuL= 1.55–1.65. Subcaudal iugum long, narrow, often relatively weak. Dorsal depression indistinct, with weak crista superior. Ventral furrow distinct, gently curved and clipping preventral and postventral tips of otolith. Outer face nearly flat, smooth.

Discussion Bollmannia ? paraguanaensis is only tentatively placed in the genus Bollmannia , primarily because of the long subcaudal iugum, which, however, is often rather poorly developed/visible. It differs from typical Bollmannia otoliths in the thin appearance caused by the nearly flat outer face and the relatively long sulcus. Te single late Miocene specimen from Darien is more compressed than the ones from the early Miocene Cantaure Formation (OL:OH = 1.02 vs 1.07–1.15) indicating that potentially two separate species could be involved.