Latonia sp.
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publication ID |
https://dx.doi.org/10.3897/fr.25.83781 |
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publication LSID |
lsid:zoobank.org:pub:7A16698D-4F18-48D2-9D96-51A6E0CC15AC |
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persistent identifier |
https://treatment.plazi.org/id/09A843FF-FAD6-5A05-8008-19BD091D6844 |
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treatment provided by |
by Pensoft |
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scientific name |
Latonia sp. |
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Fig. 8 View Figure 8
Material.
76 maxillae HLMD-Ez 2130-2135, seven frontoparietals HLMD-Ez 2141-2144, one prooticoccipital HLMD-Ez 2127, six atlases HLMD-Ez 2116-2117, 23 presacral HLMD-Ez 2118-2120 and 22 sacral vertebrae HLMD-Ez 2121-2123, two costae (ribs) HLMD-Ez 2128, 23 urostyles 2124-2126, 58 ilia HLMD-Ez 2136-2140.
Description.
Frontoparietals: All bones are very fragmentarily preserved, and all of them possess ornamentation made of a dense network of tubercles (Fig. 8A, C, E View Figure 8 ). In ventral view, a number of ridges and structures are visible (Fig. 8B, D, F View Figure 8 ); however, due to their preservation, any further description/anatomical identification is impossible.
Maxillae: All bones are fragmentarily preserved. Their labial surface is smooth and does not possess any ornamentation (Fig. 8G View Figure 8 ). Only in (HLMD-Ez 2132), the labial surface is covered by some irregularities. In lingual view, the horizontal lamina has a rounded surface and reduces height anteriorly (Fig. 8H View Figure 8 ). Posteriorly, it terminates with a medioposteriorly projecting pterygoid process. The posterior depression is moderately developed. The margo orbitalis is slightly concave.
Prooticoccipital: One preserved prooticoccipital (HLMD-Ez 2127) consists of both fused prootic and lateral occipital processes (Fig. 8I-L View Figure 8 ). It displays a distinct supracondylar depression. The prominentia ductus semicircularis posterioris is present as a distinct crest. It starts at the base of the lateral prootic process and projects medioanteriorly until the articulation surface with the frontoparietal. A foramen is present at the ventral base of the lateral prootic process. The sulcus venae jugularis is present as a horizontal groove. The fenestra ovalis is massive (Fig. 8K View Figure 8 ).
The atlas has a dorsoventrally flattened centrum (HLMD-Ez 2116, Fig. 8N View Figure 8 ). The neural arch is not preserved. The crista ventralis is well developed. The condyloid fossae are separated from each other by a notch. The opisthocoelous presacral vertebrae have massive, slightly dorsally compressed centrum. The transverse processes project laterally. The neural arch in a small-sized vertebra projects posterodorsally (HLMD-Ez 2118), and the neural spine is clearly visible (Fig. 8O, P View Figure 8 ). The sacral vertebrae have one anterior and two posterior condyles with very rounded external surfaces (Fig. 8X, Y View Figure 8 ). The neural arch is short. It measures as long as the bases of the transverse processes. The latter widens laterally and project lateroposteriorly. The prezygapophyses in both presacral and sacral vertebrae project laterodorsally (Fig. 8S, W View Figure 8 ).
The urostyle possesses two condyloid fossae and two lateroposteriorly bending transverse processes (Fig. 8Z View Figure 8 , AA). The opening of the neural canal is rounded. The neural canal opens dorsally behind the transverse processes in the form of a narrow and long strip.
The preserved ilia have low or moderately developed dorsal prominence. The dorsal protuberance has a flat surface and shows high variation in shape and size. It can be very reduced in the form of a small protuberance (HLMD-Ez 2137, Fig. 8AB) or rather well-developed elongate (HLMD-Ez 2140, Fig. 8AF) or short drop-shaped (HLMD-Ez 2140-2141, Fig. 8AF) structure. It is connected with the lateromedially compressed iliac shaft by a thin lamina which reduces in height anteriorly behind the dorsal protuberance. The acetabular region is well developed. The dorsal acetabular expansion is well-developed and has a triangular outline. The ventral acetabular expansion is rather reduced and widens ventrally, expanding below the ventral margin of the acetabular crest. The ventral portion of the acetabular crest is well developed and projects ventrolaterally. The supraacetabular fossa is absent or, if present, weakly developed. A distinct tubercular fossa is visible in the corner between dorsal prominence and iliac shaft. In both medial (Fig. 8AE, AI) and posterior views (Fig. 8AH), a well-developed interiliac tubercle is visible. In posterior view, the ilioischiatic juncture can be clearly divided into a massive ventral and a slender dorsal portions, which are delimited in the medial surface by a deep groove.
Remarks.
The herein described remains can be assigned to the genus Latonia based on the presence of the following features: 1) frontoparietal with the characteristic tubercular sculpture; 2) prooticooccipital bone with a distinct supracondylar depression; 3) atlas possessing ventral crest; 4) urostyle with lateroposteriorly projecting transverse processes; 5) the general morphology of ilium and presence of the interiliac tubercle etc. ( Roček 1994). Due to the poor preservation of the material, any further taxonomic identification is impossible.
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