Acanthochitona sandeciana Bałuk, 1965

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco, 2025, The Cenozoic European Polyplacophora (Mollusca), Zootaxa 5704 (1), pp. 1-377 : 273-274

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-FEFF-4F01-0FAD-FE6C6F309016

treatment provided by

Plazi

scientific name

Acanthochitona sandeciana Bałuk, 1965
status

 

Acanthochitona sandeciana Bałuk, 1965

Fig. 141 View FIGURE 141

Acanthochitona sandeciana Bałuk, 1965, p. 371 , 374, pl. 1, figs 9–11; Bałuk 1970, p. 115; Van Belle 1981, p. 63; Bałuk 1984, p. 292, pl. 9, fig. 1a–b; Studencka & Dulai 2010, p. 268; Ruman & Hudácková 2015, p. 165, fig. 5.1; Dell’Angelo et al. 2020b, p. 37, tab. 9.

Acanthochiton sp. III Šulc, 1934, p. 20, text-fig. 4.

Type material. Syntypes in the Bałuk’s collection, three valves (head, intermediate and tail, figured in Bałuk (1965: pl. 1, figs 9–11), Figs 141A–C View FIGURE 141 .

Type locality. Niskowa ( Poland)

Type stage. Middle Miocene.

Material examined. Middle Miocene: Paratethys: Austria: Pötzleinsdorf: NHMW 2010/0256/0008, tail valve [determined as Acanthochitona planus ( Šulc, 1934) ], width 2 mm ( Figs 141F–H View FIGURE 141 ); Hungary: Bánd: 5 valves ( BD 1158), Figs 141D–E View FIGURE 141 . Maximum width of the valves: 4.6 / 4.5 / 4 mm (from Bałuk 1965).

Description. Head valve semicircular, posterior margin straight. Intermediate valves broadly rectangular, moderately elevated, posterior margin slightly concave on both sides of pronounced apex, jugal area longitudinally striated, raised, neatly separated from lateropleural area. Tail valve broadly circular, just straighter in jugal area, WT/ LT = 1.22, jugal area longitudinally striated, raised, neatly separated from lateropleural area, mucro well evident in subcentral position, antemucronal slope straight, postmucronal slope slightly concave just behind mucro.

Whole tegmentum (except JA) sculptured with densely packed roundish granules, flattened at top, elevated, irregularly arranged, JA longitudinally striated; granules small (diameter 50–55 µm), widely separated from each other, with a single megalaesthete generally surrounded by 1 to 3 irregularly arranged micraesthetes.

Articulamentum well developed, apophyses quadrangular and very protruding, delimiting a wide jugal sinus, expanded and completely surrounding tail valve, except for jugal margin, slit formula 5 / 1 / 2.

Remarks. Acanthochitona sandeciana Bałuk, 1965 has been described upon material from the Middle Miocene of Niskowa ( Poland), and more recently from Korytnica ( Poland) ( Bałuk 1984) and Rohožník ( Slovakia) ( Ruman & Hudácková 2015). This species is characterized by the tail valve with an esagonal shape (as Acanthochiton sp. III Šulc, 1934 from Pötzleinsdorf, Austria), and the tegmentum sculpture like that of A. faluniensis , but with “ smaller and more densely packed granules ” ( Bałuk 1984, p. 292). The tail valve from Pötzleinsdorf ( Austria) at NHMW ( Fig 141E View FIGURE 141 ) has a shape which corresponds entirely to that described by Šulc (1934: text-fig. 4) as Acanthochiton sp. III, also in the form of apophyses, and comes from the same locality (Pötzleinsdorf) as the plate described by Šulc.

We attribute also tentatively to Acanthochitona sandeciana some valves from Bánd, one of which figured ( Figs 141D–E View FIGURE 141 ).

Comparisons. See Tab. 22 for a comparison with the Acanthochitona spp. considered in the present study.

Distribution. Middle Miocene: Central Paratethys (Langhian-Serravallian): Austria: Pötzleinsdorf ( Šulc 1934; this study), Poland: Korytnica, Niskowa ( Bałuk 1965, 1984), Slovakia: Rohožník ( Ruman & Hudácková 2015), Hungary: Bánd (this study).

Genus Craspedochiton Shuttleworth, 1853

Type species. Chiton laqueatus Sowerby, 1842 , by monotypy.

Distribution. Craspedochiton is known from the Eocene to the Recent, with a living distribution in the Atlantic (African coast), and temperate and (sub-) tropical Indo-Pacific ( Schwabe & Els 2019). The fossil record extends back to the upper Eocene or lower Oligocene in Washington, U.S.A. ( Dell’Angelo et al. 2011), the Oligocene in France ( Dell’Angelo et al. 2020b), the Miocene-Pleistocene in Europe ( Šulc 1934; Kroh 2003; Dell’Angelo et al. 2004, 2013, 2016, 2020b; Garilli et al. 2005; Studencka & Dulai 2010), the Pliocene-Pleistocene of New Zealand ( Sutherland et al. 1995), the Pleistocene deposits of the Red Sea ( Dell’Angelo et al. 2020a)

Remarks. Eight species are currently attributed to Craspedochiton in the Oligocene -Pleistocene of Europe. Schwabe & Els (2019) presented an emended diagnosis of the genus Craspedochiton , agreeing with the features of the species of Craspedochiton discussed herein. The main characters of the species are reported in Tab. 23.

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Chitonida

Family

Acanthochitonidae

Genus

Acanthochitona

Loc

Acanthochitona sandeciana Bałuk, 1965

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

Acanthochitona sandeciana Bałuk, 1965 , p. 371

Dell'Angelo, B. & Lesport, J. - F. & Cluzaud, A. & Sosso, M. 2020: 37
Ruman, A. & Hudackova, N. H. 2015: 165
Studencka, B. & Dulai, A. 2010: 268
Baluk, W. 1984: 292
Van Belle, R. A. 1981: 63
Baluk, W. 1970: 115
Baluk, W. 1965: 371
1965
Loc

Acanthochiton sp.

Sulc, J. 1934: 20
1934
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF