Patella tintina Martín-González, Vera-Peláez, Castillo, and Lozano-Francisco 2018
- Dataset
- New fossil gastropod species (Mollusca: Gastropoda) from the upper Miocene of the Canary Islands (Spain)
- Rank
- SPECIES
- Published in
- Martín-González, Esther, Vera-Peláez, José Luis, Castillo, Carolina, Lozano-Francisco, M. Carmen (2018): New fossil gastropod species (Mollusca: Gastropoda) from the upper Miocene of the Canary Islands (Spain). Zootaxa 4422 (2): 191-218, DOI: 10.11646/zootaxa.4422.2.3
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Archaeogastropoda
- family
- Patellidae
- genus
- Patella
- species
- Patella tintina
description
1976 Patella ambroggii Lecointre. Meco: p. 88. 2001 Patella cf. caerulea Linnaeus. Martín-González et al.: p. 52. 2001 Patella caerulea Linnaeus. Castillo et al.: p. 68. 2008 Patella ambroggii Lecointre. Meco et al.: p. 80, fig. 2.11. 2012 Patella ambroggii Lecointre. Betancort Lozano: p. 97, plate 6, figs. 4, 4 a. 2015 Patella ambroggii Lecointre. Meco et al.: p. 65, appendix 2, figs. a, b, c, d, g.
description
Description. Large-sized shell (Lmax: 112 mm; Wmax: 97.2 mm; Hmax: 51.4 mm), fragile, with thinner section in the apical region and thicker towards the base. Patelliform shape, with conical cap shape in adult phases, more flattened in juveniles. Shell base oval, wider in the posterior region than the anterior. Apex situated further towards the anterior region at nearly 2 / 3 from the posterior edge. Sculpture consists of six wide main ribs interspersed with a variable number of secondary and tertiary ribs in the anterior region; these become wider during ontogeny. In the posterior region, there are four strongly protruding main ribs, and a variable number of secondary radial ribs placed between the former. Main ribs have a rounded blunt profile. Intercostal spaces between posterior ribs are twice as wide as those in the anterior region, where the two central ribs lie very close to each other. In juvenile forms, the shell surface is covered with scales arranged radially, which are more clearly defined on the secondary ribs and disappear during ontogeny. Growth lines are clearly visible towards the lower middle part of the shell, well-defined and slightly sinuous, in some cases forming darker, circular bands seen also on the ventral side. Shell edge is sinuous and star-shaped. Mantle impression is not visibly apparent in any of the specimens, but marked in internal molds, being large, oval and open at one end, and located close to the base. Color is not preserved.
discussion
Remarks. The new taxon has features resembling those of Patella ambroggii Lecointre, 1952 from the Moroccan Pliocene as illustrated by Lecointre (1952). Therefore, several workers identified material from Neogene deposits of the Canary Islands as Patella ambroggii. After consulting photograps of the holotype of P. ambroggii (Fig. 6) deposited at the Muséum national d´Histoire naturelle in Paris, with record number R 10111, Patella tintina sp. nov. can be distinguished from P. ambroggii by having more and more densely arranged primary ribs. The base of P. ambroggii is more elongated and rippled, not fitting the pattern of four large, separate ribs in posterior position observed in the Canary species. In contrast to Patella tintina sp. nov., P. ambroggii has a secondary rib between the ribs. Moreover, growth lines on the shell surface are more pronounces in P. ambroggii and form concentric crests. Patella tintina sp. nov. is higher and more conical, with blunter ribs, which give the shell a rounded appearance. The apex is more posteriorly located in the Patella tintina than in P. ambroggii.
distribution
Distribution. Upper Miocene, Tortonian: Fuerteventura and Lanzarote (Betancort Lozano 2012); Gran Canaria (Betancort Lozano 2012; Meco et al. 2015).
etymology
Etymology. The name tintina refers to the metallic sound produced by this limpet shell when struck.
materials_examined
Type material. Holotype: adult specimen, with broken apex, large size (L: 100.6 mm; W: 85.2 mm and H: 50.1 mm), record number TFMCFO- 3438 / 1. Paratypes: four well-preserved specimens, TFMCFO- 3535 (L: 78.6 mm; A: 76.5 mm; H: 25.7 mm); TFMCFO- 4601 (L: 52.7 mm; W: 40.9 mm; H: 12.6 mm); TFMCFO- 4 608 (L: 99 mm; W: 97.2 mm), and TFMCFO- 6107 (L: 42.9 mm; W: 33.8 mm; H: 12.1 mm). Other material examined. Three more specimens from Lanzarote, with numbers TFMCFO- 3836, Punta Gorda and TFMCFO- 6483, Punta Garajao; and 25 more from Fuerteventura (TFMCFO- 3438, North of Agua Liques; TFMCFO- 3718, Punta del Viento; TFMCFO- 4593, Fuente Blanca; TFMCFO- 4594, Barranco Gavioto; TFMCFO- 4606, Playa del Valle; TFMCFO- 4603, TFMCFO- 5991, TFMCFO- 6404, Bajas Amarillas; TFMCFO- 5992, Caletones Mansos; TFMCFO- 6107, Aljibe de la Cueva; and TFMCFO- 6578, Barranco de la Cruz). Biometric data for this material are shown in Table 1. Type locality. North of Agua Liques (Fuerteventura, Canary Islands); UTM: 28 R 573615 m E 3118639 m N, 10 m asl. Sandstone deposit, approximately 50 cm in thickness. Tortonian dating defined by the gastropod assemblage described in the geological and geographic context section above. The paratypes are from the localities: Caletones Mansos (TFMCFO- 3535), Barranco León (TFMCFO- 4608), Punta de Leonardo (TFMCFO- 4601) and Aljibe de la Cueva (TFMCFO- 6107), all in Fuerteventura.