Microgobius rohri, Schwarzhans & Aguilera, 2024

Microgobius rohri n. sp.

Figure 30h–l View Fig

Holotype NMB P15696 View Materials ( Fig. 30h View Fig ), Burdigalian , Brasso FM, Trinidad, KR-6666 .

Paratypes 5 specimens same data as holotype ( NMB P15697-701 View Materials ) .

Referred specimen 45 specimens same data as holotype .

Etymology Named in memory of Karl Rohr, who has conducted important field reconnaissance work in Trinidad including the collecting of the otoliths of Microgobius rohri .

Diagnosis Otolith size up to 1.6 mm in length. OL:OH = 0.83–0.9. Otolith shape high-bodied; dorsal rim high, relatively smooth, with rounded and broadly

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Fig. 30 a–g View Fig Microgobius robertsoni n. sp.; b holotype, NMB P15687 View Materials , Cantaure FM , Paraguaná , Venezuela, PPP 2539 ; a, c–g paratypes; a, g same data as holotype, NMB P15688-89 View Materials ; c–f Cantaure FM , Paraguaná , Venezuela, PPP 2545 , NMB P15693-95 View Materials ; e MPEG- 1946- V (refigured from Aguilera et al., 2014, Fig. 12 View Fig /9) , Pirabas FM , Brazil. h–l Microgobius rohri n. sp., Brasso FM , Trinidad, KR-6666 ; h holotype, NMB P15696 View Materials ; i–l paratypes, NMB P15697-15700 View Materials . m Microgobius curtus Ginsburg, 1939 , extant, USNM 293571 About USNM , 08°26’N 78°06’W. n Microgobius erectus Ginsburg,1938 ,extant, USNM 322733 About USNM GoogleMaps , Pacific Panama, 07°25’N 80°11’W, SL 55 mm. o–t Microgobius pezoldi n. sp.; p holotype, NMB P15702 View Materials GoogleMaps , Chucunaque FM , Darien, Panama, PPP 1578 ; o, q–t paratypes; o Angostura FM , Ecuador, NMB 19301 View Materials , NMB P15703 View Materials ; q Tuira FM , Darien, Panama, PPP 1132 , NMB P15704 View Materials ; r Manzanilla FM , Trinidad, PPP 2674 , NMB P15705 View Materials ; s–t Manzanilla FM , Trinidad, PPP 2671 , NMB P15706-07 View Materials

expanded postdorsal angle and short blunt postdorsal projection. Preventral and postventral angles projecting. Sulcus small, wide, with rounded ostial lobe and rounded caudal tip; OL:SuL = 1.7–1.9; sulcus inclination angle 8–12°. Subcaudal iugum short, narrow. Ventral furrow distant from ventral rim of otolith, regularly curved. Outer face nearly flat.

Description Otolith size up to 1.6 mm in length (holotype 1.5 mm). OH:OT = 3.9–4.4. Otolith shape high-bodied. Dorsal rim high, with rounded predorsal angle and rounded, broadly expanded postdorsal angle and short blunt postdorsal projection. Anterior and posterior rims slightly inclined towards dorsal, and with mild central concavities. Ventral rim flat to slightly curved, horizontal. Preventral and postventral angles protruding resulting distance between them clearly marking longest axis. All rims smooth or slightly and irregularly undulating.

Inner face nearly flat in vertical direction and slightly bent in horizontal direction. Sulcus small and wide, with rounded ostial lobe; cauda straight, with rounded tip, slightly deepened; sulcus inclination angle 8–12°; OL:SuL = 1.7–1.9. Subcaudal iugum short, not reaching caudal tip, narrow. Dorsal depression broad, with distinct ventral margin and broad crista superior. Ventral furrow distinct, relatively distant from ventral rim of otolith and regularly curved. Outer face nearly flat, smooth.

Discussion Microgobius rohri is easily distinguished from its congeners by the protruding preventral and postventral angles, the small sulcus and its low inclination angle. It likely represents an extinct lineage and could alternatively be placed in a separate genus.