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Dinematichthys midwayensis
Taxonomy
Dinematichthys midwayensis was named by Nolf and Dockery (1993). Its type specimen is IRSNB P 6109, an otolith, and it is a 3D body fossil. Its type locality is Matthews Landing, which is in a Selandian coastal marl in the Porters Creek Formation of Alabama.
Synonymy list
Year | Name and author |
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1993 | Dinematichthys midwayensis Nolf and Dockery p. 30 figs. pl. 4, figs. 4, 5 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dinematichthys midwayensis Nolf and Dockery 1993
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Diagnosis
Reference | Diagnosis | |
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D. Nolf and D. Dockery 1993 | This species is characterized by robust, but not very thick, otoliths. Their outline is elongate and regularly elliptical, except for a slightly hollow ostial rim. The outer face is smooth and clearly convex; the inner face is also convex, the mc;>st marked convexity being situated in the dorso-ventral direction.
The sulcus does not open directly on the ostial rim, and consists of a broad ostium and a small narrow cauda. The ostiumisaboutthreetimesaslongasthecauda,andabouttwo times as broad. Both ostium and cauda have extremely flattenedcolliculathatliedeeperthanthemaininnersurface of the otoliths. One observes no clear ostial channel, but the positionofsuchachannelismarkedbyacrest-likestructure linking the anteriorpartoftheostium with the ostial rim. The crest probably corresponds to the dorsal boundary of the ostial channel. There is a well marked ventral furrow, and a slight longitudinal depression is observed in the dorsal area. |