Parachiton statianus

Dell’Angelo, Bruno, Sosso, Maurizio & Taviani, Marco, 2025, The Cenozoic European Polyplacophora (Mollusca), Zootaxa 5704 (1), pp. 1-377 : 91-92

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-FFB5-4E4B-0FAD-F985695293DA
treatment provided by	Plazi
scientific name	Parachiton statianus
status

Treatment

Parachiton statianus View in CoL Dell’Angelo, Giuntelli, Sosso & Zunino, 2015

( Fig. 40 View FIGURE 40 )

Lepidopleurus ( Parachiton) aff. africanus [non Parachiton africanus (Nierstraz, 1906) ]; Dell’Angelo et al. 2004, p. 29, pl. 2, figs 2, 6 ( partim, fide Dell’Angelo et al. 2015a).

Parachiton statianus View in CoL Dell’Angelo, Giuntelli, Sosso & Zunino, 2015a, p. 230, pl. 4, figs 1–9; Dell’Angelo et al. 2016, p. 96; Dell’Angelo et al. 2018a, p. 19, figs 4D–F.

Type material. Holotype: MGPT PU 108784 , tail valve, width 5.7 mm ( Figs 40G–H View FIGURE 40 ) . Paratypes: MGPT PU 108785 , intermediate valve ( Figs 40E–F View FIGURE 40 ); NHMW 2014/0450/0001–0002, intermediate and tail valve); BD 122–BD 123, intermediate and tail valves .

Type locality. Rio di Bocca d’Asino , Alessandria ( Piedmont, Italy) .

Type stage. Upper Miocene (Tortonian) .

Material examined. Upper Miocene: Italy (Tortonian): type material plus Rio di Bocca d’Asino : 1 valve

( MZB 32047). France (Messinian?), Ligerian Basin: Moulin-Pochas: 1 valve (PR, Fig. 40D View FIGURE 40 ). Pliocene: Spain: Estepona: 2 valves ( BD 418, MZB 32048, Fig. 40C View FIGURE 40 ). Pleistocene: Italy: Sicily: Capo Milazzo: 1 valve ( BD 419, Figs 40A–B View FIGURE 40 ). Maximum width of the valves: -- / 6 / 5.7 mm.

Description. Head valve unknown. Intermediate valves broadly rectangular, rounded in anterior profile, moderately elevated (H/W = 0.35–0.40), anterior and posterior margins straight, lateral areas not raised. Tail valve semicircular (W/L = 1.51), anterior margin almost straight, mucro posterior, antemucronal slope slightly convex, postmucronal slope short, steep, straight.

Tegmentum finely granulose. LA sculptured with not very evident irregularly arranged low granules, crossed by concentric lines of growth, that give a rough pattern to surface. PMA sculptured with more squarish granules arranged in numerous fine radiating rows, more than 100 in holotype. CA and AMA sculptured with longitudinal series of granules smoothly coalescing ( CA 90 or more; AMA 95 ), rows enough regular, diverging anteriorly on sides .

Articulamentum weakly developed, small apophyses.

Remarks. Parachiton statianus Dell’Angelo, Giuntelli, Sosso & Zunino, 2015 is a rare species recently described on few valves for most incomplete, only the holotype is represented by a complete tail valve. The fossil record is known from the upper Miocene of the Ligerian Basin ( France) and Po Basin (N. Italy), the Pliocene of Estepona Basin ( Spain) and the Pleistocene of S. Italy.

Comparisons. This species closely resembles Parachiton africanus ( Nierstrasz, 1906) .

Distribution. Upper Miocene: northeastern Atlantic: Ligerian Basin, France: Moulin Pochas ( Dell’Angelo et al. 2018a); Proto-Mediterranean Sea (Tortonian): Po Basin, N Italy: Rio di Bocca d’Asino ( Dell’Angelo et al. 2015a). Pliocene: western Mediterranean, Estepona Basin, Spain: Estepona (Dell’Angelo et al. 2004). Pleistocene: central Mediterranean, S. Italy: Capo Milazzo (this study).