Microgobius camur, Schwarzhans & Aguilera, 2024

Microgobius camur n. sp.

Figure 31f–k View Fig

Holotype NMB P15716 View Materials ( Fig. 31f View Fig ), Gelasian , Escudo de Veraguas FM, Atlantic Panama, PPP 2171 .

Paratypes 5 specimens: 1 specimen Zanclean, Cayo Agua FM , Atlantic Panama, PPP 1275 ( NMB P15720 View Materials ) . 1 specimen Piacenzian, Escudo de Veraguas FM , Atlantic Panama, PPP 1241 ( NMB P15718 View Materials ) . 2 specimens Gelasian : 1 specimen Escudo de Veraguas FM , Atlantic Panama, PPP 2170 ( NMB P15717 View Materials ) ; 1 specimen Bastimentos FM , Ground Creek Unit, Atlantic Panama, PPP 1252 ( NMB P15719 View Materials ) . 1 specimen Calabrian, Swan Cay FM , Atlantic Panama, PPP 2221 ( NMB P15721 View Materials ) .

Referred specimen 8 specimens: 2 specimens Piacenzian: 1 specimen Río Banano FM , Atlantic Costa Rica, PPP 3243 ; 1 specimen Escudo de Veraguas FM , Atlantic Panama, PPP 1241 . 1 specimen Gelasian , Bastimentos FM , Ground Creek Unit, Atlantic Panama, PPP 1252 . 5 specimens Calabrian: 1 specimen Bastimentos FM , Ground Creek Unit, Atlantic Panama, PPP 2249 ; 4 specimens Swan Cay FM , Atlantic Panama, PPP 2221 .

Etymology From camur (Latin) = hooked, curved, referring to the hooked shape of the subcaudal iugum.

Diagnosis Otolith size up to 1.65 mm in length. OL:OH = 0.76–0.83. Otolith shape high-bodied; dorsal rim elevated, regularly crenulated; predorsal angle and postdorsal projection not protruding. Preventral and postventral angles rounded. Sulcus short, wide, with high, triangular ostial lobe and cauda posteriorly shortened by ingressing subcaudal iugum; OL:SuL = 1.65– 2.05; sulcus inclination angle 15–20°. Subcaudal iugum long, wide, hook-like extended into rear part of cauda. Ventral furrow close and parallel to ventral rim of otolith, regularly curved.

Description Otolith size up to 1.65 mm in length (holotype). OH:OT = 3.3–4.0, decreasing with size. Otolith shape high-bodied. Dorsal rim high, rounded or with rounded middorsal angle; predorsal angle indistinct, postdorsal projection blunt, not protruding. Anterior rim nearly vertical, posterior rim slightly inclined toward ventral and straight. Ventral rim flat to slightly curved, horizontal. Preventral and postventral angles rounded. All rims more or less strongly crenulated or undulating.

Inner face completely flat. Sulcus short, wide, particularly broad, triangular ostial lobe widened; cauda short, with rounded or tapering tip; sulcus inclination angle 15–20°; OL:SuL very variable, depending on degree of ingression of subcaudal iugum, 1.65–2.05. Subcaudal iugum long, wide, usually ingressing into posterior portion of cauda to various extends: ranging from very strong and considerably shortening cauda ( Fig. 31f, g, j View Fig ) to moderately strong ingressing ( Fig. 31i, k View Fig ), however, almost not ingressing in rare cases ( Fig. 31h View Fig ). Dorsal depression indistinct, wide. Ventral furrow mostly distinct, close and parallel to ventral rim of otolith and regularly curved. Outer face evenly convex, variably ornamented.

Discussion Microgobius camur is the largest species in this otolith plexus and readily recognized by the combination of the intense crenulation or undulation of its rims, particularly the dorsal rim, the high triangular ostial lobe resulting in a wide sulcus and the large subcaudal iugum, which often very strongly ingresses into the rear part of the cauda thereby considerably shortening the length of the sulcus.