Diameza (Miniseraphs) eratoides ( Cossmann, 1889 )

Caze, Bruno, Merle, Didier, Pacaud, Jean-Michel & Saint Martin, Jean-Paul, 2010, First Systematic Study using the Variability of the Residual Colour Patterns: The Case of the Paleogene Seraphsidae (Mollusca, Gastropoda, Stromboidea), Geodiversitas 32 (3), pp. 417-477 : 448-450

publication ID	https://doi.org/ 10.5252/g2010n3a4
persistent identifier	https://treatment.plazi.org/id/03A69848-FF88-1E7E-FD1A-FE8BFEACFCD9
treatment provided by	Marcus
scientific name	Diameza (Miniseraphs) eratoides ( Cossmann, 1889 )
status

Treatment

Diameza (Miniseraphs) eratoides ( Cossmann, 1889) ( Figs 20 View FIG F-J; 22)

Terebellum (Seraphs) eratoides Cossmann, 1889: 98 View in CoL , 99, pl. 3, figs 7, 8;

Terebellum (Seraphs) eratoides View in CoL – Cossmann 1904: 46. — Cossmann & Pissarro 1905: 97, pl. 16, fig. 36; 1911: pl. 32, fig. 158-7.

Seraphs (Miniseraphs) eratoides View in CoL – Jung 1974: 30, pl. 9, figs 10-12, text-figs 19, 20. — Le Renard 1992: 6. — Le Renard & Pacaud 1995: 112. — Pacaud & Le Renard 1995: 162.

TYPE LOCALITY. — Chaussy, Les Garennes (Val d’Oise, France), Lutetian (Middle Eocene).

TYPE MATERIAL. — Lectotype designated by Jung (1974) from the Bernay collection; paralectotype (Boutillier coll.) from Vaudancourt (Oise), not found.

The type material of this species has not been found in the Bernay collection, now deposited at the UCBL. A neotype designation is needed to clarify the taxonomic status of this species.A neotype from the type locality ( MNHN A28932, Faullummel coll., Fig. 22 View FIG A-D) is accordingly chosen here. This initiative conforms to the rules specified by the ICZN (1999: art. 75), as regards the designation of a neotype.

OTHER MATERIAL EXAMINED. — See Appendix 1.

SHELL DESCRIPTION

Shell up to 8 mm in height and up to 5 mm in diameter, very stout with wide apical angle ( Fig. 20 View FIG F-H). Aperture long and narrow. Callus of the inner lip clearly delineated, but weakly developed.Columella slightly bent backwards near the base. Outer lip thickened and forming a small protuberance at the apex ( Fig. 20J View FIG ). Outer lip slightly sinuous for the whole height in labral view ( Fig. 20G View FIG ). Siphonal notch moderately deep on the dorsal side. Faint oblique to spiral grooves near the base ( Fig. 20I View FIG ).

COLOUR PATTERN DESCRIPTION

The residual pattern is only composed of 2 levels of residual pigmentation: dark lines on a lighter background. Th ese axial lines are wavy, but do not cover the whole shell surface. Most specimens show a combination of two morphologies: 1) dark wavy lines, sometimes forming zigzags ( Fig.22E View FIG ), which are visible on the extremities of the shell and near the outer lip; 2) on the median part of the shell, a chessboard morphology ( Fig. 22A, C, E, G, I, J View FIG ), as defined by Meinhardt (1998: fig. 5.6). Th e chessboard pattern can appear as “light dots” on a darker background on poorly preserved shells ( Fig. 22G, J View FIG ).

VARIABILITY

The intraspecific variability is weak. Some specimens show numerous continuous wavy lines near the outer lip ( Fig. 22E, F View FIG ), while others show a chessboard pattern on the whole shell surface, except for the abapical and adapical extremities ( Fig. 22G, H View FIG ).

UCBL	Centre de Paleontologie Stratigraphique et Paleoecologie
MNHN	Museum National d'Histoire Naturelle

Copyright notice

No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.

Taxonomy

Kingdom	Animalia
Phylum	Mollusca
Class	Gastropoda
Order	Littorinimorpha
Family	Seraphsidae
Genus	Diameza