Craspedochiton brunettii

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco, 2025, The Cenozoic European Polyplacophora (Mollusca), Zootaxa 5704 (1), pp. 1-377 : 279-280

publication ID

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
status

 

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).

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Chitonida

Family

Acanthochitonidae

Genus

Craspedochiton

Loc

Craspedochiton brunettii

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco 2025
2025
Loc

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
2016
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