Paraseraphs placitus Jung, 1974

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 : 456

publication ID

https://doi.org/ 10.5252/g2010n3a4

persistent identifier

https://treatment.plazi.org/id/03A69848-FFB0-1E78-FF29-FC4DFCFFFA12

treatment provided by

Marcus

scientific name

Paraseraphs placitus Jung, 1974
status

 

Paraseraphs placitus Jung, 1974 View in CoL ( Figs 24 View FIG G-M; 28)

Paraseraphs placitus Jung, 1974: 38 View in CoL , pl. 10, figs 13-18, text-fig. 28.

Terebellum fusiforme – Sowerby 1821: 157, pl. 287. — De Blainville 1828: 276. — Deshayes 1835: 738, pl. 95, figs 30, 31. Non Lamarck, 1802.

Terebellum View in CoL (s.s.) fusiforme – Glibert 1938: 65, 66, pl. 2, fig.7. — Cossmann 1889: 96 partim. Non Lamarck, 1802.

Terebellum View in CoL (s.s.) fusiforme postconicum Cossmann, 1904: 44. Non de Gregorio, 1880.

Paraseraphs placitus View in CoL – Dolin et al. 1980: 28. — Le Renard 1992: 6. — Le Renard & Pacaud 1995: 112. — Pacaud & Le Renard 1995: 162.

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

TYPE MATERIAL. — Holotype ( NMB H14491); paratype ( NMB H10539), Les Garennes, Chaussy ( Val d’Oise , France); paratypes ( UCBL coll. Deshayes), Mouchy-le- Châtel (Oise) and Parnes (Oise), not found.

OTHER MATERIAL EXAMINED. — See Appendix 1.

DESCRIPTION

Shell

Shell up to 30 mm in height and 7 mm in diameter, moderately slender and evolute with distinct suture. Aperture long and narrow. Callus of the inner lip well developed, well delineated, extending to the apex and forming a narrow band parallel to the outer lip ( Fig. 24I View FIG ). Basal part of the columella bent backwards. Outer lip, almost straight and slightly opisthocline ( Fig. 24H, M View FIG ), not thickened on the basal part of the shell. Adapical part of the outer lip thickened and extending from the adapical end of the aperture, towards the apex ( Fig. 24H View FIG ), or bent towards the dorsal side ( Fig. 24M View FIG ). Siphonal notch moderately deep. Sculpture with a few oblique grooves near the base of the shell ( Fig. 24K View FIG ).

Colour pattern

Paraseraphs placitus has numerous and irregular dots with 2 levels of residual coloration on a lighter background ( Fig. 28 View FIG ). The first level consists of triangular spots, darker than the background.Th ese spots, more or less distorted, are orientated towards the growing edge ( Fig. 28C, F, L View FIG ). The second level consists of fluorescent spots with fuzzy borders, lighter than the background. These light spots, adjacent to the base of dark spots, are narrow and directed towards the inner lip in ventral view ( Fig. 28C, F, L View FIG ). They are variable in size. Th ese two components form the dots. The density of dots is generally low. Also, a peculiar pattern can be distinguished on the adapical part of the outer lip: an oblique succession of darker and lighter “patches” ( Fig. 28B, D, E, M, N View FIG ). These “patches” are probably the result of the coalescence of the dark axial segments ( Fig. 28D View FIG ).

VARIABILITY

Sometimes the darker spots of the dots are larger near the edge of the outer lip ( Fig. 28B, C, P View FIG ) and are coalescent.

NMB

Naturhistorishes Museum

UCBL

Centre de Paleontologie Stratigraphique et Paleoecologie

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Seraphsidae

Genus

Paraseraphs

Loc

Paraseraphs placitus Jung, 1974

Caze, Bruno, Merle, Didier, Pacaud, Jean-Michel & Saint Martin, Jean-Paul 2010
2010
Loc

Paraseraphs placitus

LE RENARD J. & PACAUD J. - M. 1995: 112
LE RENARD J. & PACAUD J. - M. 1995: 162
LE RENARD J. 1992: 6
DOLIN L. & DOLIN C. & LE RENARD J. 1980: 28
1980
Loc

Paraseraphs placitus

JUNG P. 1974: 38
1974
Loc

Terebellum

GLIBERT M. 1938: 65
COSSMANN M. 1889: 96
1938
Loc

Terebellum

COSSMANN M. 1904: 44
1904
Loc

Terebellum fusiforme

DESHAYES G. - P. 1835: 738
DUCROTAY DE BLAINVILLE H. M. 1828: 276
SOWERBY J. 1821: 157
1821
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