Bollmannia cubaguana, 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 : 32

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FFB4-FFFB-018C-FE1061F1FE58
treatment provided by	Felipe
scientific name	Bollmannia cubaguana
status	sp. nov.

Treatment

Bollmannia cubaguana n. sp.

Figure 17m –q View Fig

Holotype NMB P15499 View Materials ( Fig. 17m View Fig ), Zanclean , Cubagua FM above Cerro Negro Member, Venezuela, Isla Cubagua, PPP 2568 .

Paratypes 11 specimens: Zanclean, Cubagua FM above Cerro Negro Member, Venezuela, Isla Cubagua, 2 specimens PPP 2568 ( NMB P15500-01 View Materials ) , 6 specimens PPP 2571 ( NMB P15502-04 View Materials ) , 3 specimens PPP 2572 ( NMB P15508-10 View Materials ) .

Etymology After the Cubagua Formation, the type formation.

Diagnosis OL:OH = 1.1–1.15. Maximal size 3.9 mm (holotype). Predorsal rim slanted; postdorsal region slightly elevated. Dorsal rim irregularly undulating or crenulated. Preventral angle slightly projecting. Sulcus wide; OL:SuL = 1.85–1.95. Subcaudal iugum long, moderately wide.

Description Otolith size up to 4.0 mm in length (holotype 3.9 mm). OH:OT = 3.1–3.3. Predorsal angle low, often depressed, postdorsal angle expanded, postdorsal projection blunt, only slightly longer than postventral angle, not bent outward. Ventral rim straight, horizontal. Anterior rim inclined, with slightly projecting preventral angle; posterior rim nearly vertical, with broad, wide and rather deep indentation at its middle. All rims smooth, except dorsal rim irregularly undulating or crenulated.

Inner face almost entirely flat. Sulcus sole-shaped with low ostial lobe, moderately deepened, inclined at 12–15°. Caudal tip rounded, slightly bent upward. OL:SuL = 1.85–1.95. Subcaudal iugum long, moderately wide. Dorsal depression wide, indistinct and close to sulcus with distinct crista superior. Ventral furrow distinct, moderately distant from ventral rim of otolith. Outer face moderately to distinctly convex, strongest inframedian, relatively smooth with few furrows on dorsal field.

Discussion Bollmannia cubaguana is very similar to B. chlamydes differing only in few subtle characters, primarily in being less elongate in specimens larger than 3 mm in length (OL:OH 1.1–1.15 vs 1.25–1.4) and the less strongly inclined sulcus (12–15° vs 15–18°). Presumably, B. cubaguana represents an extinct geminate species in the West Atlantic to the extant East Pacific B. chlamydes . Te largest specimen (holotype) of B. cubaguana shows a slightly middorsal concavity, similar to but much less strongly developed as in otoliths of the B. stigmatura plexus (see below).