Microgobius glaber, Schwarzhans & Aguilera, 2024

Microgobius glaber n. sp.

Figure 31l–p View Fig

Holotype NMB P15722 View Materials ( Fig. 31l View Fig ), Messinian , Manzanilla FM, Montserrat Member, Trinidad, PPP 2666 .

Paratypes 9 specimens: 6 specimens Messinian , same data as holotype ( NMB P15723-28 View Materials ) . 3 specimens Tortonian , Cercado FM , Dominican Republic, NMB 17003 View Materials ( NMB P392 View Materials ) .

(See figure on next page.)

Fig. 31 a–e View Fig Microgobius aphioides n. sp., Cubagua FM , Venezuela; a holotype, NMB P15710 View Materials , PPP 2549 ; b–e paratypes; b PPP 2568 , NMB P15711 View Materials ;

c PPP 3057 , NMB P15712 View Materials ; d PPP 3066 , NMB P15714 View Materials ; e PPP 2549 , NMB P15715 View Materials . f–k Microgobius camur n. sp.; f holotype, NMB P15716 View Materials , Escudo de Veraguas FM, Bocas del Toro, Panama , PPP 2171 ; g–k paratypes; g Escudo de Veraguas FM, Bocas del Toro, Panama, PPP 2170 , NMB P15717 View Materials ; h Escudo de Veraguas FM, Bocas del Toro, Panama, PPP 1241 , NMB P15718 View Materials ; i Bastimentos FM, Ground Creek Unit, Bastimentos Island, Panama , PPP 1252 , NMB P15719 View Materials ; j Cayo Agua FM, Atlantic Panama , PPP 1276 , NMB P15720 View Materials ; k Swan Cay FM, Atlantic Panama , PPP 2221 , NMB P15721 View Materials . l–p Microgobius glaber n. sp.; l holotype, NMB P15722 View Materials , Manzanilla FM, Trinidad, PPP 2666 ; m–p paratypes; m–o Cercado FM, Dominican Republic, NMB 17003 View Materials , NMB P392 View Materials ; p Manzanilla FM, Trinidad, PPP 2666 , NMB P15723 View Materials . q–v Microgobius praeglaber n. sp.; q holotype, NMB P15729 View Materials , upper Brasso FM, Trinidad, KR-9244 ; r–v paratypes; r–t upper Brasso FM, Trinidad, KR-9244 , NMB P15730-32 View Materials ; u–v Gatun FM, Colon, Panama, PPP 2167 , NMB P15734-35 View Materials . W Microgobius sp.2 , Armuelles FM, Pacific Panama , PPP 3236 , NMB P15737 View Materials . X Microgobius sp.1 , Armuelles FM, Pacific Panama , PPP 3235 , NMB P15738 View Materials

Referred specimen 50 specimens: 31 specimens Tortonian: 2 specimens Tuira FM , Pacific Panama, Darien, PPP 1134 ; 7 specimens Yaviza FM , Pacific Panama, Darien, PPP 1528 ; 10 specimens Gatun FM , Atlantic Panama , 2 specimens PPP 2165 , 8 specimens PPP 2168 ; 5 specimens Manzanilla FM , San José Member , Trinidad , 1 specimen PPP 2671 , 1 specimen PPP 2674 , 3 specimens PPP 2676 ; 7 specimens Cercado FM , Dominican Republic, NMB 17003 View Materials . 19 specimens Messinian , same data as holotype .

Etymology From glaber (Latin) = smooth, referring to the smooth outline and surface of these otoliths.

Diagnosis Otolith size up to 1.15 mm in length. OL:OH = 0.83–0.9. Otolith shape high-bodied; dorsal rim elevated, with rounded postdorsal angle; predorsal angle and postdorsal projection not protruding. Preventral and postventral angles rounded. Sulcus long, narrow, with moderately wide, angular ostial lobe and very narrow cauda; OL:SuL = 1.5–1.6; sulcus inclination angle 13–23°. Subcaudal iugum long, narrow, slightly bent around rear part of cauda and ingressing cauda from ventral. Ventral furrow close and parallel to ventral rim of otolith, regularly curved. Inner and outer faces smoothened.

Description Otolith size up to 1.15 mm in length (holotype 1.05 mm). OH:OT = 2.9–3.4. Otolith shape high-bodied. Dorsal rim high, rounded or with rounded postdorsal angle; predorsal angle broadly rounded, postdorsal projection blunt, not protruding. Anterior and posterior rims nearly vertical, nearly straight. Ventral rim slightly curved, horizontal. Preventral and postventral angles rounded. All rims smooth.

Inner face flat in vertical direction and slightly bent in horizontal direction. Sulcus long, narrow, with moderately wide, angular ostial lobe and very narrow cauda, with tapering tip; sulcus inclination angle very variable, 13–23°; OL:SuL = 1.5–1.6. Subcaudal iugum long, narrow, seemingly ingressing cauda ventrally, extending as narrow feature around caudal tip and sometimes also extending anteriorly below ostium. Dorsal depression wide, with distinct crista superior towards sulcus. Ventral furrow distinct, close and parallel to ventral rim of otolith and regularly curved. Outer face evenly convex, smooth.

Discussion Microgobius glaber differs from the other species in the Microgobius camur plexus in the combination of the smooth rims and inner and outer faces and the unusually narrow cauda.