Bollmannia angosturae, Schwarzhans & Aguilera, 2024

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 : 38-40

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FF8E-FFC3-0236-FCF0635FFCB8
treatment provided by	Felipe
scientific name	Bollmannia angosturae
status	sp. nov.

Treatment

Bollmannia angosturae n. sp.

Figure 21a–d View Fig

Holotype NMB P15529 View Materials ( Fig. 21a View Fig ), Tortonian , Angostura FM, Ecuador, PPP 3465 .

Paratypes 3 specimens: 2 specimens Tortonian , Atlantic Panama, Gatun FM, PPP 2167 ( NMB P15548-49 View Materials ) ; 1 specimen Messinian , Onzole FM , Ecuador, NMB 19084 View Materials ( NMB P15547 View Materials ) .

Etymology After the type formation, the Angostura FM of Tortonian age in Ecuador.

Diagnosis OL:OH = 1.05–1.15. Maximal size 2.25 mm (holotype). Otolith shape nearly rectangular with rounded dorsal rim. Predorsal angle high, postdorsal region not significantly elevated, preventral angle not projecting, postdorsal projection not extending beyond postventral angle. Sulcus narrow, small, with very low ostial lobe; OL:SuL = 1.9–2.2. Subcaudal iugum long, relatively narrow. Sulcus inclination angle 7–12°.

Description Otolith size up to 2.25 mm in length (holotype). OH:OT = 2.7–2.9. Dorsal rim relatively low, regularly curved, with high, rounded predorsal angle and rounded postdorsal angle. Postdorsal projection blunt, not projecting beyond postventral angle, not bent outward; preventral angle orthogonal or rounded. Ventral rim straight, horizontal. Anterior and posterior rims nearly vertical, posterior rim with relatively weak indentation at its middle. All rims smooth, dorsal rim slightly undulating.

Inner face nearly flat. Sulcus sole-shaped, narrow, small, with low ostial lobe, moderately deep, inclined at 7–12°. Caudal tip rounded. OL:SuL = 1.9–2.2. Subcaudal iugum long, narrow, often relatively weak. Dorsal depression wide, deep and distinct, open to dorsal rim of otolith and moderately close to sulcus with well-developed crista superior. Ventral furrow distinct, gently curved and clipping preventral and postventral tips of otolith. Outer face broadly convex, smooth.

Discussion Bollmannia angosturae is similar to the extant B. eigenmannorum ( Fig. 21e View Fig ) sharing the small and narrow and only slightly inclined sulcus and the weak preventral and postdorsal projections. It differs from the extant West Atlantic species in being more elongate (OL:OH = 1.05–1.15 vs 1.0–1.05) and the relatively weak subcaudal iugum.