Chiton reussi Rzehak, 1893

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco, 2025, The Cenozoic European Polyplacophora (Mollusca), Zootaxa 5704 (1), pp. 1-377 : 299-300

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-FEC5-4F3B-0FAD-FAB66BCF97A1
treatment provided by	Plazi
scientific name	Chiton reussi Rzehak, 1893
status

Treatment

Chiton Reussi m. ( Chiton siculus? Reuss View in CoL ); Rzehak, 1893, p. 171.

Remarks. Rzehak (1893) described the new species Chiton reussi from the Lower Badenian of Oslawan ( Czech Republic), based on a single incomplete intermediate valve, without providing an illustration. Instead Rzehak refers to the illustration of C. siculus Gray in Reuss (1860: pl. 8, figs 1–3), although pointing out that the ornamentations is slightly different). Therefore, it is impossible to confirm the attribution of this intermediate valve in the absence of the original specimen, and this taxon should be considered a species inquirenda.

“ Acantochiton ” (sic) costatus Sacco, 1897

Fig. 153O–P View FIGURE 153

Acantochiton (sic) costatus Sacco, 1897, p. 91 , pl. 7, figs 36–37 ( partim, non figs 33–35 = Craspedochiton mutinocrassus

( Sacco, 1897), fide Dell’Angelo et al. 2016, p. 91; Dell’Angelo et al. 1999, p. 283; Dell’Angelo et al. 2016, p. 91. Craspedochiton View in CoL ? sp. Dell’Angelo et al. 2016, p. 91, pl. 6, figs 16–19.

Remarks. Sacco (1897) described the new species Acantochiton (sic) costatus based on some head and tail valves from the Turin Hill Miocene. The head valves (Sacco: pl. 7, figs 33–35) are now attributed to Craspedochiton mutinocrassus ( Sacco, 1897) by Dell’Angelo et al. 2016 (see above), while the cospecificity of the tail valve ( Sacco 1897: pl. 7, figs 36–37) was already considered doubtful by the same author. As evidenced by Dell’Angelo et al. (2016), the shape of the tail valve is different from that of C. altavillensis (more elliptical), as also the form of the apophysis. Even the attribution to the genus Craspedochiton is uncertain, since the articulamentum does not present the large teeth typical of this genus. Our inspection of the valve from the Bellardi-Sacco collection (MRSN, BS.105.04.002, reproduced here, Figs 153O–P View FIGURE 153 ) revealed only a couple of incisions, which may also correspond to those typical of the genus Acanthochitona , but we cannot exclude that other incisions have been obliterated due to erosion or missing due to the incompleteness of the posterior margin of the valve. We prefer to keep the previously described valve in open nomenclature as Craspedochiton ? sp.

Species of problematic assignment

We list here, in systematic order and year of publication, those records whose determination is problematic, generally because of the scarcity of available material or its poor preservation state. Some original figures are included in the summary plate ( Fig. 154 View FIGURE 154 ).

References

Figures

FIGURE 153. Species of unclear taxonomic position. A. Chiton octovalvis Woodward, 1830, Grignon (France), Eocene, articulated chiton (from Parkinson 1811: pl. 5, fig. 5). B–C. “Lepidopleurus” daubrei de Rochebrune, 1882, Mérignac (France), Miocene, intermediate valve, dorsal view (B), tail valve, dorsal view (C) (from de Rochebrune 1882: pl. 1, fig. 9). D. “Tonicia” wattebledi de Rochebrune, 1882, Gaas (France), Oligocene (Rupelian), dorsal view (from de Rochebrune 1882: pl. 3, fig. 3). E. “Tonicia” gaasensis de Rochebrune, 1882, Gaas (France), Oligocene (Rupelian), dorsal view (from de Rochebrune 1882: pl. 2, fig. 7). F. “Tonicia” pustulifera de Rochebrune, 1882, Gourbesville (France), Pliocene-Pleistocene, dorsal view (from de Rochebrune 1882: pl. 3, fig. 2). G–H. “Gymnoplax” gaudryi de Rochebrune, 1882, Gourbesville (France), Pliocene-Pleistocene, intermediate valve, dorsal view (G), tail valve, dorsal view (H) (from de Rochebrune 1882: pl. 1, fig. 6). I–J. “Gymnoplax” chalmasi de Rochebrune, 1882, Gourbesville (France), Pliocene-Pleistocene,intermediate valve, dorsal view (I), tail valve, dorsal view (J) (from de Rochebrune 1882: pl. 1, fig. 4). K. “Acanthochites” meunieri de Rochebrune, 1882, Gourbesville (France), Pliocene-Pleistocene, intermediate valve, dorsal view (from de Rochebrune 1882: pl. 3, fig. 4). L. Acanthochites dulignoni de Rochebrune, 1882, Largileyre (France), Miocene, dorsal view (from de Rochebrune 1882: pl. 3, fig. 5). M. Acanthochites woodi de Rochebrune, 1882, Sutton (U.K.), Pliocene, intermediate valve, dorsal view (from Wood 1848: pl. 20, fig. 9b as Chiton fascicularis?). N. “Chiton” damesi Koenen, 1892, Latdorf (Germany), lower Oligocene, tail valve, dorsal view (from Koenen 1892: pl. 59, fig. 23b). O–P. “Acantochiton” (sic) costatus Sacco, 1897, Turin hill (Italy), lower Miocene, tail valve, width 18.5 mm, dorsal (O) and posterior (P) views (from Dell’Angelo et al. 2016: pl. 6, fig. 18–19).

FIGURE 154. Problematic species assignment. A. Leptochiton sp. Dell’Angelo, Garilli, Germanà, Reitano, Sosso & Bonfitto, 2012, Altavilla Milicia (Italy), Pliocene, BD 254, intermediate valve, width 4.5 mm, dorsal view (from Dell’Angelo et al. 2012: fig. 3E). B. Leptochiton sp. Dell’Angelo, Sosso, Prudenza & Bonfitto, 2013, Garlenda (Italy), Pliocene (Zanclean), MZB 45704, head valve, width 2 mm, dorsal view (from Dell’Angelo et al. 2013: pl. 3, fig. A). C. Leptochiton sp. Dell’Angelo, Landau, Van Dingenen & Ceulemans 2018, Saint-Clément-de-la-Place (France), Miocene (Tortonian), MNHN.F.A67067, intermediate valve, width 1.7 mm, dorsal view (from Dell’Angelo et al. 2018b: fig. 6A). D. Leptochiton sp., Gamachot (France), lower Miocene, BD, tail valve, width 1.9 mm, dorsal view (from Dell’Angelo et al. 2018a: fig. 3M, as Leptochiton cf. L. josei Dell’Angelo, Sosso, Prudenza & Bonfitto, 2013). E. Leptochiton sp., Rocco di Passerano (Italy), lower Miocene, MZB 32014, head valve, width 4.3 mm (from Dell’Angelo et al. 2015: pl. 3, fig. 12, as Leptochiton salicensis Dell’Angelo & Bonfitto, 2005). F. Leptochiton sp., Borelli (Italy), Miocene (Tortonian), MZB 32015, tail valve, width 2.1 mm, (from Dell’Angelo et al. 2015: pl. 3, fig. 15, as Leptochiton salicensis Dell’Angelo & Bonfitto, 2005). G. Hanleya sp. Dell’Angelo, Landau & Marquet, 2004, Estepona, Velerin Antena (Spain), Pliocene, BD, tail valve, width 4.3 mm, dorsal view (from Dell’Angelo et al. 2004: pl. 3, fig. 1). H. Ischnochiton? sp. Dell’Angelo, Sosso, Prudenza & Bonfitto, 2013, Caranchi (Italy), Pliocene (Zanclean), MZB 45717, tail valve, width 2 mm, dorsal view (from Dell’Angelo et al. 2013: pl. 4, fig. N). I. Stenosemus sp., Moulin Pochas (France), upper Miocene, PR, head valve, width 4 mm, dorsal view [from Dell’Angelo et al. 2018a: fig. 6D, as Stenosemus dolii (Van Belle & Dell’Angelo, 1998)]. J–K. Callochiton sp. Dell’Angelo, Sosso, Prudenza & Bonfitto, 2013, Rio S. Antonino (Italy), MZB 45727, tail valve, width 3.2 mm, dorsal (J) and lateral (K) views (from Dell’Angelo et al. 2013: pl. 5, figs Q–R). L–M. Rhyssoplax sp., Abesse (France), upper Oligocene, DA, intermediate valve, width 1.4 mm, dorsal (L) and frontal (M) views

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Taxonomy

Kingdom	Animalia
Phylum	Mollusca
Class	Polyplacophora
Order	Chitonida
Family	Chitonidae
Genus	Chiton