Gobiidae Ebersole, Cicimurri & Stringer, 2019, indet.
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2019
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| author | Ebersole, Jun A. Cicimurri, David J. Stringer, Gary L. |
| author_facet | Ebersole, Jun A. Cicimurri, David J. Stringer, Gary L. |
| contents | <p><b>Gobiidae</b> indet.</p><p>Fig. 70 O–P</p><p><b>Material examined</b></p><p>UNITED STATES OF AMERICA – <b>Alabama</b> • 1 otolith; MSC 39045.</p><p><b>Description</b></p><p>Small otolith measuring 2.1 mm in length, roughly trapezoidal in shape. Inner face primarily smooth (except for depression at dorsal area), convex. Margins smooth, sharp in transversal view. Anterior margin ranging from almost straight to slightly incurved.Anterodorsal unevenly rounded. Dorsal margin only slightly rounded, subparallel with ventral margin. Posterodorsal is characterized by small rounded projection. Posterior incurved. Ventral margin almost straight, horizontal. Well-defined, divided sulcus slants slightly from posterodorsal to anteroventral. Ostium about twice as long and twice as wide as cauda. The ostium oval in shape, much more excavated than cauda. Ostium almost touches anterior margin. Posterior of cauda rounded. Ridge-like crista superior located above sulcus. Prominent, deeply depressed area in dorsal area touches crista superior. Crista inferior is small, ridge-like structure beneath cauda and posterior of ostium. Outer face smooth, convex, thickest at approximately center but thinning towards margins.</p><p><b>Remarks</b></p><p>The oldest known possible gobiid otolith occurred in middle Ypresian strata of India (Nolf <i>et al.</i> 2006). Gobiid otoliths are quite rare in all known assemblages until the late Eocene. Nolf & Stringer (2003) noted 57 specimens of gobiids (“genus <i>Gobiidarum</i> ” <i>vetustus</i>) from the upper Eocene Yazoo Clay of Louisiana. We believe that the Lisbon Formation gobiid represents a different species from the Yazoo Clay taxon because of the significant differences between the shape of the otolith sulci, but a larger Lisbon sample is needed to corroborate our observation.</p><p><b>Stratigraphic and geographic range in Alabama</b></p><p>The single gobiid specimen was recovered from the “upper” Lisbon Formation at site ACh-7. Bartonian, zones NP16 and NP17.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_3664446 |
| institution | Zenodo |
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| publishDate | 2019 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Gobiidae Ebersole, Cicimurri & Stringer, 2019, indet. Ebersole, Jun A. Cicimurri, David J. Stringer, Gary L. Biodiversity Taxonomy Animalia Chordata Actinopterygii Perciformes Gobiidae <p><b>Gobiidae</b> indet.</p><p>Fig. 70 O–P</p><p><b>Material examined</b></p><p>UNITED STATES OF AMERICA – <b>Alabama</b> • 1 otolith; MSC 39045.</p><p><b>Description</b></p><p>Small otolith measuring 2.1 mm in length, roughly trapezoidal in shape. Inner face primarily smooth (except for depression at dorsal area), convex. Margins smooth, sharp in transversal view. Anterior margin ranging from almost straight to slightly incurved.Anterodorsal unevenly rounded. Dorsal margin only slightly rounded, subparallel with ventral margin. Posterodorsal is characterized by small rounded projection. Posterior incurved. Ventral margin almost straight, horizontal. Well-defined, divided sulcus slants slightly from posterodorsal to anteroventral. Ostium about twice as long and twice as wide as cauda. The ostium oval in shape, much more excavated than cauda. Ostium almost touches anterior margin. Posterior of cauda rounded. Ridge-like crista superior located above sulcus. Prominent, deeply depressed area in dorsal area touches crista superior. Crista inferior is small, ridge-like structure beneath cauda and posterior of ostium. Outer face smooth, convex, thickest at approximately center but thinning towards margins.</p><p><b>Remarks</b></p><p>The oldest known possible gobiid otolith occurred in middle Ypresian strata of India (Nolf <i>et al.</i> 2006). Gobiid otoliths are quite rare in all known assemblages until the late Eocene. Nolf & Stringer (2003) noted 57 specimens of gobiids (“genus <i>Gobiidarum</i> ” <i>vetustus</i>) from the upper Eocene Yazoo Clay of Louisiana. We believe that the Lisbon Formation gobiid represents a different species from the Yazoo Clay taxon because of the significant differences between the shape of the otolith sulci, but a larger Lisbon sample is needed to corroborate our observation.</p><p><b>Stratigraphic and geographic range in Alabama</b></p><p>The single gobiid specimen was recovered from the “upper” Lisbon Formation at site ACh-7. Bartonian, zones NP16 and NP17.</p> |
| title | Gobiidae Ebersole, Cicimurri & Stringer, 2019, indet. |
| topic | Biodiversity Taxonomy Animalia Chordata Actinopterygii Perciformes Gobiidae |
| url | https://doi.org/10.5281/zenodo.3664446 |