Lissodus sp.
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publication ID |
https://doi.org/ 10.5281/zenodo.13514789 |
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persistent identifier |
https://treatment.plazi.org/id/03DF87A9-A305-FF9A-4106-F922B3B5FD60 |
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treatment provided by |
Felipe |
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scientific name |
Lissodus sp. |
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Lissodus sp. Morphotype 2
Figs. 4A, B View Fig .
Diagnosis.—Isolated microscopic hybodontoid teeth. Linguo−labially compressed teeth with enameloid crown, median crest from lateral edge to lateral edge, non−differentiated cusps, base exceeds horizontal length of crown. Labial crown buttress present. Base is long, may have a number of nodes on the lingual aspect, ventral surface is concave crescent shaped.
Material.—Two figured, isolated specimens, one complete, TCD.36765, 66.
Description.—The length along the median crest ranges from 1.25 mm to 1.6 mm. The labio−lingual width is 0.23 mm for the crown (base, from 0.32 mm to 0.38 mm); the height in lingual view is from 0.35 mm to 0.56 mm (crown only, 0.1 mm to 0.32 mm). The crown is slightly asymmetric sloping away from the mid point to the lateral edges. Ornamentation is sparse, though some subdued grooves appear to drop vertically from the crest outlining a median cusp. A medio−labial buttress is present. The base extends beyond the crown at both lateral margins, the lingual surface has a number of expanded pits or furrows while the linguo−ventral margin is convex; labially two hollows appear either side and below the labio−crown buttress; ventrally concave with smooth nodes at the lateral edges, wider on the lingual side.
Discussion.—The specimen TCD.36765 has a shorter crown length relative to its base than TCD.36766 and also has nodes on the lingual crown surface; the slope of the median crest is steeper in TCD.36765 than in TCD.36766; the lingual base of TCD.36766 has more pronounced expanded pits or furrows. These Morphotype 2 teeth can be distinguished by their smooth, broad median crest and lack of vertical ridges descending from the crest, together with a crown that is much shorter than the base.
Age, locality, and lithology.—Kilbride Limestone Formation, Polygnathus mehli conodont Biozone, Ivorian (probably Freyrian), late Tournaisian, Dinantian. Disused quarry, near Nobber, Co. Meath (N 845 848); crinoidal limestone.
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