Brassoichthys, Schwarzhans & Aguilera, 2024
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publication ID |
https://doi.org/10.1186/s13358-023-00302-5 |
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persistent identifier |
https://treatment.plazi.org/id/492D87AA-FF8C-FFCC-0236-FAF06011FD98 |
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treatment provided by |
Felipe |
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scientific name |
Brassoichthys |
| status |
gen. nov. |
Genus Brassoichthys n. gen.
Type species Brassoichthys tornabenei n. sp.
Etymology Named after the type formation, the Brasso Formation of Trinidad.
Diagnosis A fossil otolith-based genus of the Gobiosomatini , Microgobius Group, Bollmannia clade with the following combination of characters. Otoliths nearly quadratic in outline with rounded dorsal rim and slightly expanded postdorsal projection; OL:OH = 0.98–1.03. Inner face flat; outer face mildly convex, smooth. Sulcus relatively large and wide but with low ostial lobe; OL:SuL = 1.7–1.85; sulcus inclination angle 7–10°. Subcaudal iugum moderately large. Dorsal depression deep; ventral furrow distinct, gently curving.
Discussion Brassoichthys is an easily recognizable otolith pattern that occupies a morphological position between the Bollmannia type and the Microgobius type pattern. Te nearly equal OL:OH ratio of around 1.0 matches this intermediate position, with Bollmannia otoliths being more slender and those of Microgobius more compressed and high-bodied. Te sulcus shape and expression of the subcaudal iugum matches those of both clades; the low sulcus inclination angle is to the lower end of the range found in the putatively related taxa.
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