Craspedochiton brunettii
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https://doi.org/10.11646/zootaxa.5704.1.1 |
publication LSID |
lsid:zoobank.org:pub:747DFE8B-156A-493A-8817-5F861C4D6319 |
persistent identifier |
https://treatment.plazi.org/id/03FEF726-FEF9-4F07-0FAD-F9786B6B90C5 |
treatment provided by |
Plazi |
scientific name |
Craspedochiton brunettii |
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Craspedochiton brunettii Dell’Angelo, Giuntelli, Sosso & Zunino, 2016
Fig. 143 View FIGURE 143
Craspedochiton brunettii Dell’Angelo, Giuntelli, Sosso & Zunino, 2016, p. 92, pl. 7, figs 9–12; Dell’Angelo et al. 2020b, p. 44, tab. 9.
Type material. Holotype MGPT-PU 135300, tail valve, width 9.5 mm, Figs 143A–D View FIGURE 143 . Type locality. Montegibbio ( Emilia-Romagna, Italy).
Type stage. Miocene (Tortonian).
Material examined. Miocene (Tortonian): Italy: Montegibbio: type material .
Description. Head and intermediate valves unknown. Tail valve flat, characteristic bell shape at top, semicircular in lower part (WT/LT = 1.22), anterior margin slightly sinuous bordering a large and triangular jugal area, side margins sinuous, rounded posterior margin, mucro subcentral, not elevated and little evident, antemucronal and postmucronal slopes slightly convex.
Tegmentum covered with large, dense and elevated granules of irregular shape, except on JA, becoming larger and coalescing towards margins, granules highly variable, from single granules, almost ellipsoidal to quadrangular, to coalescing granules fused to form irregular cords, especially near JA, where they are also less evident, top of granules convex; some granules close to posterior margin are rectangular in shape, 2–3 times larger than neighboring granules. Each granule with many megalaesthetes and micraesthetes (more than 10) arranged without any apparent order.
Articulamentum thick, apophyses expanded with rounded edges, widely separated by an unconnected sinus, nine slits, deep and dorsally slightly elevated, forming a channel, teeth broad and roughed dorsally, very irregular.
Remarks. The fossil record of Craspedochiton brunettii Dell’Angelo, Giuntelli, Sosso & Zunino, 2016 is represented thus far by a single tail valve from the upper Miocene of Montegibbio ( Dell’Angelo et al. 2016).
This valve is very characteristic and different from the other European Craspedochiton spp . here discussed. The presence of the insertion lamina with numerous slits and granules with the top convex confirm the attribution to the genus Craspedochiton .
Comparisons. The main difference with the tail valves of Craspedochiton altavillensis (Seguenza, 1876) regards the shape of the tegmentum, elliptical in C. altavillensis with the width about twice the length (WT/LT = 1.62–1.89), much more lengthened and with a characteristic bell shape at the top in C. brunettii (WT/LT = 1.22). Furthermore the jugal area is narrower in C. altavillensis , the valves are higher, and the granules are more regular.
Distribution. Late Miocene: Proto-Mediterranean Sea (Tortonian): Po Basin, Italy: Montegibbio ( Dell’Angelo et al. 2016).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Craspedochiton brunettii
Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco 2025 |
Craspedochiton brunettii
Dell'Angelo, B. & Lesport, J. - F. & Cluzaud, A. & Sosso, M. 2020: 44 |
Dell'Angelo, B. & Giuntelli, P. & Sosso, M. & Zunino, M. 2016: 92 |