Bollmannia trinidadensis, 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 : 29-30

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FFB7-FFF9-0236-FC306083FB98
treatment provided by	Felipe
scientific name	Bollmannia trinidadensis
status	sp. nov.

Treatment

Bollmannia trinidadensis n. sp.

Figure 16h–o View Fig

Holotype NMB P681 View Materials ( Fig. 16h View Fig ), Burdigalian (N 7, NN 4), Brasso FM, Trinidad, Tamanaquito River, KR 6666.

Paratypes 7 specimens: Burdigalian (N 7): Trinidad, Brasso FM , 4 specimens same data as holotype ( NMB P15486-89 View Materials ). Burdigalian (N 8): Venezuela, Cantaure FM , 1 specimen PPP 2546 ( NMB P15492 View Materials ). Langhian: Trinidad, upper Brasso FM ( N 10-12 ) , 2 specimens KR 9244 ( NMB P15490-91 View Materials ) .

Referred material 390 specimens: Burdigalian: Trinidad, Brasso FM , 82 specimens same data as holotype; Venezuela, Cantaure FM , 16 specimens PPP 2543 ; 43 specimens PPP 2545 ; 235 specimens PPP 2546 ; 3 specimens PPP 2539 . Langhian: Trinidad, upper Brasso FM , 11 specimens KR 9244.

Etymology After Trinidad, the country of origin of the holotype.

Diagnosis OL:OH = 1.0–1.05. Maximal size 2.2 mm. Predorsal rim high; postdorsal region somewhat higher. Dorsal rim smooth to slightly undulating or crenulated. Sulcus wide, relatively deep. Subcaudal iugum long, narrow.

Description Otolith size up to 2.2 mm in length (holotype 2.1 mm). OH:OT = 3.0–3.2. Otolith shape nearly rectangular with moderately elevated postdorsal region, predorsal angle high, rounded, slightly lower than postdorsal angle, postdorsal projection blunt, not or slightly longer than postventral angle, not bent outward. Ventral rim straight, horizontal, smooth. Anterior and posterior rims nearly vertical; preventral angle blunt; posterior rim with distinct, broad indentation at its middle. All rims smooth, dorsal rim undulating to mildly crenulated.

Inner face nearly flat in vertical direction, slightly bent in horizontal direction. Sulcus sole-shaped, broad but with low ostial lobe, distinctly deepened, inclined at 12–17°. OL:SuL = 1.75–1.85. Subcaudal iugum long, relatively narrow. Dorsal depression wide, relatively long, distinct, moderately close to sulcus with broad crista superior. Ventral furrow distinct, moderately close to ventral rim of otolith. Outer face distinctly convex, strongest inframedian, more or less smooth.

Discussion Bollmannia trinidadensis is best recognized by its wide and rather deep sulcus in combination with a relatively narrow subcaudal iugum and a very weak marginal ornamentation. It is a common species in the late Burdigalian of Trinidad ( Fig. 16h–m, o View Fig ) and the Cantaure Formation (Langhian) of Venezuela ( Fig. 16o View Fig ).