Parrella lucida, 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 : 44-45

publication ID	https://doi.org/10.1186/s13358-023-00302-5
persistent identifier	https://treatment.plazi.org/id/492D87AA-FF80-FFC8-0236-FC76631CFC5E
treatment provided by	Felipe
scientific name	Parrella lucida
status	sp. nov.

Treatment

Parrella lucida n. sp.

Figure 22k–m View Fig

Holotype NMB P690 View Materials ( Fig. 22k View Fig ), Zanclean , Manzanilla FM, Telemaque Member, Trinidad, K 9833.

Paratypes 3 specimens Zanclean: 2 specimens Shark Hole FM , Atlantic Panama, Valiente Peninsula, PPP 2217 ( NMB P15562 View Materials ) ; 1 specimen, Cubagua FM above Cerro Negro Member , Venezuela, PPP 2653 ( NMB P15563 View Materials ) .

Etymology From lucidus (Latin) = clear, referring to the clear allocation of the holotype to the genus Parrella .

Diagnosis (holotype) OL:OH = 1.15. Maximal size 2.05 mm (holotype). Otolith shape dorsally expanded with predorsal angle and postdorsal projection projecting strongest. Sulcus narrow, short, with low ostial lobe; OL:SuL = 2.1. Subcaudal iugum moderately long and wide. Sulcus inclination angle 20°.

Description (holotype) Otolith size up to 2.05 mm in length (holotype). OH:OT = 2.9. Predorsal angle high, rather sharp and distinctly projecting; postdorsal projection also sharp and projecting resulting in longest axis of otolith shifted way above sulcus. Dorsal rim regularly curved, highest shortly behind its middle, undulating. Preventral and postventral angles rounded, recessed. Anterior rim straight, downward inclined; posterior rim straight, downward inclined, with slight concavity below pointed postdorsal projection. Ventral rim straight, horizontal.

Inner face slightly convex. Sulcus sole-shaped, moderately deep, narrow, inclined at 20°; low ostial lobe, cauda with rounded tip. OL:SuL = 2.1. Subcaudal iugum moderately long, wide. Dorsal depression broad, indistinct. Ventral furrow distinct, regularly curved, relatively close to ventral rim of otolith. Outer face broadly convex, slightly more than inner face, smooth.

Remarks Te paratypes associated with this species are distinctly smaller and show less clear characteristics than the holotype, which we consider an ontogenetic effect. However, with more specimens being recovered it could also appear that they represent juveniles of another species.

Discussion Parrella lucida differs from the known extant congeners in the otolith shape with the projecting predorsal and postdorsal regions and the relatively narrow sulcus. Today, a single species occurs in the West Atlantic, P. macropteryx Ginsburg, 1939 , of which otoliths are not known.