Bollmannia baldwinae, Schwarzhans & Aguilera, 2024

Bollmannia baldwinae n. sp.

Figure 20a–m View Fig

Holotype NMB P15537 View Materials ( Fig. 20g View Fig ), Tortonian, Yaviza FM, Pacific Panama, Darien, PPP 1609 .

Paratypes 12 specimens: 4 specimens late Burdigalian, Venezuela, Cantaure FM , 1 specimen PPP 2545 ( NMB P15533 View Materials ) , 2 specimens PPP 2546 ( NMB P15534-35 View Materials ) , 1 specimen PPP 2539 ( NMB P15536 View Materials ) ; 2 specimens Langhian, Trinidad, Brasso FM , Cb. 1852 ( NMB P676 View Materials and NMB P15532 View Materials ) ; 3 specimens same data as holotype , 1 specimen PPP 1607 ( NMB P15538 View Materials ) , 2 specimens PPP 1620 ( NMB P15539-40 View Materials ) ; 1 specimen Tortonian, Trinidad, Manzanilla FM, PPP 2666 ( NMB P15543 View Materials ) ; 2 specimens Messinian, Venezuela, Isla Margarita, La Tejita FM, PPP 3087 ( NMB P15541-42 View Materials ) .

Referred specimens 88 specimens: 24 specimens late Burdigalian, Venezuela, Cantaure FM , 6 specimens PPP 2545 , 18 specimens PPP 2546 ; 2 specimens Langhian, Trinidad, Brasso FM , Cb. 1852; 12 specimens Langhian, Venezuela, Socorro FM , 4 specimens PPP 2642 , 8 specimens PPP 2644 ; 2 specimens Langhian, Pacific Panama, Darien, Tapaliza FM , 1 specimen PPP 1152 , 1 specimen PPP 1538 ; 4 specimens Tortonian, Pacific Panama, Darien, Tuira FM , 1 specimen PPP 1134 , 1 specimen PPP 1139 , 2 specimens PPP 1627 ; 36 specimens Tortonian, Pacific Panama, Darien, Yaviza FM , 8 specimens PPP 1607 , 1 specimen PPP 1528 , 2 specimens PPP 1145 , 11 specimens PPP 1620 , 3 specimens PPP 1149 , 8 specimens PPP 1171 , 1 specimen PPP 1565 , 2 specimens PPP 1566 ; 5 specimens Tortonian, Trinidad, Manzanilla FM, PPP 2666 ; 3 specimens Messinian, Venezuela, Isla Margarita, La Tejita FM, PPP 3087 .

Etymology Named in honor of Carole Baldwin (USNM, Washington D.C.) in recognition of her many contributions to the understanding of gobies from America.

Diagnosis OL:OH = 1.05–1.12. Maximal size 2.6 mm. Dorsal rim with distinctive middorsal indentation. Predorsal angle high, postdorsal region elevated, preventral angle orthogonal; postdorsal projection slightly extending beyond postventral angle. Sulcus wide, deep; OL:SuL = 1.6–1.8. Subcaudal iugum short, wide. Sulcus inclination 8–16°.

Description Otolith size up to 2.6 mm in length (holotype 2.4 mm). OH:OT = 3.0–3.3. Dorsal rim with distinct,

(See figure on next page.)

Fig. 20 a–m View Fig Bollmannia baldwinae n. sp.; g holotype, NMB P15537 View Materials , Yaviza FM, Darien, Panama, PPP 1609 ; b–m paratypes, a–b Brasso FM, Langhian , Trinidad , Cb. 1852, a NMB P676 View Materials , b NMB P15532 View Materials ; c Cantaure FM, El Hatillo-1, Venezuela , PPP 2545 , NMB P15533 View Materials ; d, f Cantaure FM, Casa Cantaure, Venezuela , PPP 2546 , NMB P15534-35 View Materials ; e Cantaure FM, San José de Cocodite , Venezuela , PPP 2539 , NMB P15536 View Materials ; h–j Yaviza FM, Darien, Panama, h

PPP 1607, NMB P15538, i–j PPP 1620, NMB P15539-40; k–l Tejita FM, Isla Margarita, Venezuela,PPP 3087,NMB P15541-42; m Manzanilla FM, Trinidad, PPP 2666, NMB P15543. n Bollmannia sp. 2 , Bastimentos FM, Ground Creek Unit, Bastimentos, PPP 1256, NMB P15544. o Bollmannia macropoma Gilbert,1892 ,extant, CAS 44137, Cost Rica,Golfo de Nicoya, SL 86 mm. p Bollmannia stigmatura Gilbert, 1892 , extant, USNM 116364, Pacific

Columbia, Puerto Utria. q Bollmannia sp. 3 , Socorro FM,Paraguaná, Venezuela, PPP 2642, NMB P15545

somewhat variable but mostly sharp and deep middorsal indentation in front of postdorsal expansion. Predorsal angle high, rounded, postdorsal region expanded, often with steep anterior border. Postdorsal projection projecting slightly beyond postventral angle, not bent outward; preventral angle orthogonal. Ventral rim straight to slightly curved, horizontal. Anterior rim nearly vertical, posterior rim slightly inclined, with relatively broad indentation at its middle. Ventral rim smooth, dorsal rim smooth or irregularly undulating.

Inner face nearly flat. Sulcus sole-shaped with moderate ostial lobe, deep, inclined at 8–16°. Caudal tip rounded. OL:SuL = 1.6–1.8. Subcaudal iugum short, wide to almost as wide as long in cases. Dorsal depression wide, deep and mostly distinct, open to dorsal rim of otolith and close to sulcus with well-developed crista superior. Ventral furrow distinct, relatively close to ventral rim of otolith. Outer face broadly convex, smooth.

Discussion Bollmannia baldwinae is readily distinguished from its fossil congeners by the distinct middorsal indentation. Te middorsal indentation varies somewhat in expression and strength from broadly concave to nearly orthogonally incised and usually increases in strength with size. Bollmannia baldwinae is distinguished from the extant congeners of the plexus B. macropoma

( Fig. 20o View Fig ) and B. stigmatura ( Fig. 20p View Fig ) in being more compressed (OL:OH = 1.05–1.12 vs 1.15–1.2) and showing a broader, more pronounced postdorsal region. Te short and wide subcaudal iugum is also characteristic of B. baldwinae . Bollmannia baldwinae is a widely distributed species in the East Pacific and West Atlantic with a long duration range from the late Burdigalian to the Messinian over about 11 to 12 mya. Te species is regarded as the earliest record in the Bollmannia stigmatura otolith plexus because of its conspicuous middorsal indentation.