Antilligobius collinsae, Schwarzhans & Aguilera, 2024

Schwarzhans, Werner W. & Aguilera, Orangel A., 2024, Otoliths of the Gobiidae from the Neogene of tropical America, Swiss Journal of Palaeontology (13) 143 (1), pp. 1-129 : 48-50

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FF84-FFD5-0236-FB106031FAB8
treatment provided by	Felipe
scientific name	Antilligobius collinsae
status	sp. nov.

Treatment

Antilligobius collinsae n. sp.

Figure 24j–s View Fig

Holotype NMB P15593 View Materials ( Fig. 24j View Fig ), Piacenzian , Escudo de Veraguas FM, Atlantic Panama, PPP 1241 .

Paratypes 9 specimens: 2 specimens Tortonian : 1 specimen Angostura FM , Ecuador, 1 specimen PPP 3301 ( NMB P15602 View Materials ) ; 1 specimen Tuira FM , Pacific Panama, Darien, PPP 1132 ( NMB P15594 View Materials ) . 1 specimen Messinian, Chucunaque FM , Pacific Panama, Darien, PPP 1578 ( NMB P15599 View Materials ) . 1 specimen Zanclean, Cubagua FM , Cerro Negro Member , Venezuela, PPP 3055 ( NMB P15601 View Materials ) . 1 specimen, Gelasian, upper Escudo de Veraguas FM , Atlantic Panama, PPP 2170 ( NMB P15600 View Materials ) . 4 specimens Gelasian, Bastimentos FM , Ground Creek Unit, Atlantic Panama, PPP 3202 ( NMB P15595-98 View Materials ) .

Referred specimens 141 specimens: 34 specimens Tortonian : 10 specimens Tuira FM , Pacific Panama, Darien , 3 specimens PPP 1132 , 6 specimens PPP 1134 , 1 specimen PPP 1164 ; 8 specimens Yaviza FM , Pacific Panama, Darien, PPP 1566 ; 16 specimens Gatun FM , Atlantic Panama, PPP 2167 . 5 specimens Messinian, Chucunaque FM , Pacific Panama, Darien, PPP 1578 . 6 specimens Zanclean : 3 specimens Cubagua FM , Venezuela, 1 specimen PPP 2556 , 2 specimens PPP 3055 ; 3 specimens Springvale FM , Trinidad, KR 1216. 8 specimens Piacenzian, Escudo de Veraguas FM , Atlantic Panama, PPP 1241 . 88 specimens Gelasian : 15 specimens, Gelasian, upper Escudo de Veraguas FM , Atlantic Panama, PPP 2170 ; 52 specimens Bastimentos FM , Ground Creek Unit, Atlantic Panama , 40 specimens PPP 3202 , 3 specimens PPP 1256 , 9 specimens PPP 3204 ; 21 specimens Moin FM , Atlantic Costa Rica , 4 specimens PPP 2032 , 4 specimens PPP 2038 , 7 specimens PPP 3259 , 2 specimens PPP 3260 , 4 specimens PPP 3262 .

Etymology Named in honor of Laurel Collins (Florida International University) in recognition of her important contribution to the understanding of the geology and paleontology of the Isthmus of Panama.

Diagnosis OL:OH = 1.05–1.1; OH:OT = 2.65–2.8. Maximal size 1.3 mm. Otolith shape nearly quadratic with predorsal angle positioned high and at same level as postdorsal tip. Sulcus short, narrow, with very low ostial lobe; OL:SuL = 1.85–2.05; sulcus inclination angle 6–12°. Subcaudal iugum moderately long, relatively narrow. Dorsal depression indistinct, small. Ventral furrow distinct, regularly curving, close to ventral rim of otolith.

Description Otolith size up to 1.3 mm in length (holotype 1.25 mm); Otolith shape high-bodied with predorsal angle positioned high and at same level as postdorsal tip; preventral and postventral angles well developed. Dorsal rim variably curved or relatively flat, with variable postdorsal tip, smooth. Ventral rim straight, horizontal. Anterior and posterior rims steep, without or with weak and broad central concavities. All rims smooth.

Inner face flat with region above ventral furrow and below dorsal depression slightly bulged. Sulcus small, narrow, relatively deep, with very low ostial lobe; sulcus inclination angle 6–12°; OL:SuL = 1.85–2.05. Subcaudal iugum moderately long, relatively narrow. Dorsal depression indistinct, mostly small. Ventral furrow distinct, regularly curved, relatively close to ventral rim of otolith. Outer face variably convex, smooth.

Discussion Antilligobius collinsae differs in only few subtle characters from the extant A. nikkiae , i.e., the slightly less compressed appearance (OL:OH 1.05–1.1 vs 0.92– 1.02) and in being thicker (OH:OT = 2.65–2.8 vs 3.2–3.7). Antilligobius collinsae appears to represent a plesiomorphic counterpart to the extant species and occurs earlier in the stratigraphy in the Tortonian (Late Miocene) but shows a considerable stratigraphic overlap with A. nikkiae over the Piacenzian and Gelasian.