Diameza Deshayes, 1865

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 : 446

Genus Diameza Deshayes, 1865

TYPE SPECIES. — Ovula media Deshayes & Milne-Edwards, 1844 (= Ovula fragilis Defrance, 1825 ) by monotypy. Lutetian, Paris Basin.

GENERIC DISCUSSION

Jung(1974) considered Diameza and Miniseraphs Jung, 1974 , as two subgenera of Seraphs . Nevertheless, S. (Diameza) fragilis ( Defrance, 1825) , S. (Miniseraphs) eratoides ( Cossmann, 1889) and S. (Miniseraphs) isabella (Bernay in Deshayes, 1865) have very small and inflated shells with a large apical angle ( Fig. 20 ) which are obviously different from those of Seraphs (s.s.) ( Figs 6 ; 11 ; 15 ) which are larger,slender and more elongated. Th us, these species are, here, no longer considered to belong to the genus Seraphs and are placed together within Diameza , which is here raised to the generic level.The name Diameza ,older than the name Miniseraphs , is selected for this genus including two subgenera: Diameza and Miniseraphs .

Under UV light, these three species show very similar patterns ( Figs 21-23 ). They bear sinuous or wavy axial lines which are lacking in Seraphs ( Figs 7-10 ; 12 ; 13 ; 16 ; 18 ), in Paraseraphs ( Figs 26 ; 28 ; 30 ) and Terebellum ( Figs 1 ; 2 ). These observations strengthen the initial interpretation based on the shell morphology: Diameza (s.s.) fragilis , D. (Miniseraphs) eratoides and D. (Miniseraphs) isabella are closely related and very different from all other fossil and Recent species.

Figures

FIG. 20. — Diameza Deshayes,1865 shells in normal light:A-E, Diameza (s.s.) fragilis (Defrance,1825),MNHN A28784 (Faullummel coll.), Villiers-Saint-Frédéric,Yvelines,France,Lutetian;A, ventral view;B, detailed view of the apical part;C, labral view;D, detailed view of the oblique grooves; E, dorsal view;F-J, Diameza (Miniseraphs) eratoides (Cossmann,1889);F-H, MNHN A28785 (Faullummel coll.),Chaussy (Les Garennes),Val d’Oise,France,Lutetian; F, ventral view;G, labral view;H, dorsal view;I, MNHN A28934 (detailed view of the oblique grooves) (leg.Pacaud),Fontenay-en-Vexin (Beauregard),Eure,France,Lutetian; J, MNHN B63254 (dorsal view) (Lhomme coll.),Hervelon, Marne, France, Lutetian; K-O, Diameza (Miniseraphs) Isabella (Bernay in Deshayes, 1865); K, L, MNHN A28782 (leg.Pacaud), Parnes, Oise, France, Lutetian; K, ventral view; L, dorsal view; M-O, MNHN A28783 (leg. Pacaud), Cauvigny, Oise, France, Lutetian; M, ventral view; N, labral view; O, dorsal view. Scale bars: A, C, E-H, J-O, 5 mm; B, D, 1 mm; I, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 6. — Seraphs Montfort, 1810 shells in normal light: A-E, S. volutatus (Solander in Brander, 1766); A-C, MNHN A28776 (ex Galerie de Zoologie coll.), Grignon, Yvelines, France, Lutetian; A, ventral view; B, labral view; C, dorsal view; D, E, lectotype of Terebellum convolutum Lamarck, 1802,MNHN B70325 (Lamarck coll.), Grignon,Lutetian; D, ventral view; E, dorsal view; F, G, S. sopitus (Solan- der in Brander,1766),MNHN A28778 (Faullummel coll.), Le Limon, Seine-et-Marne, France, Bartonian;F, ventral view; G, labral view; H-J, S. olivaceus (Cossmann,1889);H, I, MNHN A28577 (Ledon coll.),Chaussy (Les Garennes),Val d’Oise,France,Lutetian;H, ventral view; I, dorsal view; J, MNHN A29225, labral view (Ledon coll.), Chaussy (Les Garennes), Lutetian. Scale bars: 10 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 11.— Seraphs Montfort,1810 shells in normal light:A-C, Seraphs sp.1, MNHN A25011 (Faullummel coll.),Chaussy (Les Garennes), Val d’Oise, France, Lutetian; A, ventral view; B, labral view; C, dorsal view; D, E, Seraphs sp. 2, MNHN A28887 (de Morgan coll.), Fresville (Coteau de Vauville), Manche, France, Lutetian; D, labral view; E, dorsal view; F-I, S. leukoleptus Jung, 1974; F, H, I, neotype, MNHN A28781 (Ledon leg.), Chaussy (Les Garennes), Lutetian; F, ventral view; H, dorsal view; I, labral view; G, MNHN A28968 (Houdas coll.), Chaussy, Lutetian, detailed view of the oblique grooves. Scale bars: A-F, H, I, 10 mm; G, 5 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 15. — Seraphs Montfort, 1810 shells in normal light; A-I, S. chilophorus (Cossmann, 1889); A-E, MNHN A28779 (Ledon coll.), Chaussy (Les Garennes), Val d’Oise, France, Lutetian; A, ventral view; B, labral view; C, detailed view of the apical part; D, dorsal view;E, detailed view of the apical part; F-H, MNHN A28780 (Ledon coll.), Chaussy (Les Garennes), Lutetian;F, ventral view;G, dorsal view; H, detailed view of the apical part; I, MNHN A27783, detailed view the oblique grooves (leg. Pacaud), Saint-Lubin-de-la-Haye, Eure-et-Loir, France, Lutetian; J-N, S. peterjungi n. sp., holotype MNHN A28578 (Pacaud leg.), Chaussy (Les Garennes), Lutetian; J, ventral view; K, labral view; L, detailed view of the apical part; M, detailed view the oblique grooves; N, dorsal view. Scale bars: A-B, D, F-G, J-K, N, 10 mm; C, I, 5 mm; E, H, L, M, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 21. — Diameza (s.s.) fragilis (Defrance, 1825) under UV light: A-F, neotype, MNHN A28939 (leg. Pacaud), Villiers-Saint-Frédéric, Yvelines,France,Lutetian;A, dorsal view;B, detailed view of the chessboard pattern;C, labral view;D, abapertural view;E, detailed view of the chessboard pattern;F, detailed view of the lines;G-I, MNHN A28940 (Faullummel coll.),Villiers-Saint-Frédéric,Lutetian;G, dorsal view; H, detailed view of the zigzagging lines; I, labral view; J, K, MNHN A28784 (Faullummel coll.), Villiers-Saint-Frédéric, Lutetian; J, dorsal view; K, labral view; L-N, MNHN A28942, Villiers-Saint-Frédéric,Lutetian; L, dorsal view; M, detailed view of the zigzagging lines; N, labral view. Scale bars: A, C-D, G, I-L, N, 5 mm; B, E, F, 1 mm; H, M, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 22. — Diameza (Miniseraphs) eratoides (Cossmann,1889) under UV light:A-D, neotype,MNHN A28932,Chaussy (Les Garennes), Val d’Oise, France, Lutetian; A, ventral view; B, labral view; C, dorsal view; D, abapertural view; E-G, MNHN A28934, Fontenay-en- Vexin,Eure,France,Lutetian;E, dorsal view;F, labral view;G, detailed view of the chessboard pattern;H-J, MNHN A28933,Fontenayen-Vexin, Lutetian; H, dorsal view; I, labral view; J, detailed view of the chessboard pattern. Scale bars: A-F, H-I, 10 mm; G, J, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 23. — Diameza (Miniseraphs) isabella (Bernay, 1889) under UV light: A-D, neotype, MNHN A28935 (leg. Pacaud), Chaussy (Les Garennes), Val d’Oise, France, Lutetian; A, ventral view; B, labral view; C, dorsal view; D, abapertural view; E, MNHN A28938 (labral view) (leg. Pacaud), Chaussy (Les Garennes), Lutetian; F-J, MNHN A28937 (Faullummel coll.), Chaussy (Les Garennes), Lutetian; F, detailed view of the axial and zigzaging lines; G, ventral view; H, detailed view of the axial lines; I, abapertural view; J, dorsal view; K-P, MNHN A28936, Chaussy (Les Garennes), Lutetian; K, ventral view; L, labral view; M, dorsal view; N, detailed view of the zigzaging axial lines; O, dorsal view in negative; P, abapertural view. Scale bars: A-E, G, I-M, O-P, 10 mm; F, H, N, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 7. — Seraphs volutatus (Solander in Brander, 1766) under UV light: A, B, G, MNHN A28873, Grignon, Yvelines, France, Lutetian; A, ventral view; B, dorsal view; G, detailed view of the dots; C, D, MNHN A28876, Grignon, Lutetian; C, ventral view; D, dorsal view; E, F, MNHN A28875 (Valenciennes coll.), Fontenay-en-Vexin, Eure, France, Lutetian; E, ventral view; F, dorsal view; H, I, MNHN A28874, Grignon, Lutetian; H, ventral view; I, dorsal view. Scale bars: A-F, H, I, 10 mm; G, 5 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 8. — Oldest known specimens of Seraphs volutatus (Solander in Brander, 1766) under UV light: A-D, MNHN A30419, Sapicourt, Marne, France, Ypresian (Cuisian); A, dorsal view; B, C, detailed view of the dots; D, labral view; E, F, MNHN A30420, Sapicourt, Ypresian (Cuisian); E, dorsal view; F, labral view. Scale bars: A, D, E, F, 5 mm; B, C, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 9. — Seraphs sopitus (Solander in Brander,1766) under UV light:A-D, MNHN A28884,Saint-Witz (Le Guépelle),Val d’Oise,France, Bartonian; A, dorsal view; B, labral view; C, D, detailed views of the dots; E-H, MNHN A27526, Saint-Witz (Le Guépelle), Bartonian; E, dorsal view; F, abapertural view; G, H, detailed views of the dots; I-K, MNHN A28778, Le Limon, Seine-et-Marne, France, Bartonian; I, dorsal view; J, detailed view of the dots; K, abapertural view. Scale bars: A, B, E, F, I, K, 10 mm; C, D, J, 2 mm; G, H, 5 mm. Photographs by C. Lemzaouda and P. Loubry (MNHN).

FIG. 10. — Seraphs olivaceus (Cossmann, 1889) under UV light: A-C, MNHN A28560 (leg. Pacaud), Chaussy (Les Garennes), Val d’Oise,France,Lutetian; A, dorsal view; B, abapertural view; C, detailed view of the dots;D, E, MNHN A29057 (Houdas coll.),Chaussy (Les Garennes), Lutetian; D, dorsal view; E, abapertural view; F-H, neotype, MNHN A28885 (leg. Pacaud), Chaussy (Les Garennes), Lutetian; F, dorsal view; G, labral view; H, detailed view of the dots. Scale bars: A, B, D-G, 10 mm; C, 5 mm; H, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 12.— Seraphs Montfort,1810 shells under UV light:A-C, Seraphs sp.1, MNHN A25011 (Faullummel coll.),Chaussy (Les Garennes), Val d‘Oise, France, Lutetian; A, ventral view; B, abapertural view; C, dorsal view; D-F, Seraphs sp. 2, MNHN A28887 (de Morgan coll.), Fresville (Coteau de Vauville), Manche, France, Lutetian;D, ventral view; E, labral view; F, abapertural view. Scale bars: 10 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 13. — Seraphs leukoleptus Jung, 1974, under UV light: A-C, neotype, MNHN A28781 (Ledon leg.), Chaussy (Les Garennes), Val d’Oise,France,Lutetian;A, dorsal view;B, detailed view of the dots;C, abapertural view; D-H, MNHN A28968 (Houdas coll.),Chaussy (Les Garennes), Lutetian; D, ventral view; E, F, abapertural views (E negative view); G, dorsal view; H, detailed view of the dots. Scale bars: A, C-G, 10 mm; B, H, 2 mm. Photographs by C. Lemzaouda and P. Loubry (MNHN).

FIG. 16. — Seraphs chilophorus (Cossmann, 1889) under UV light: A, B, MNHN A28927 (Roissy coll.), Parnes, Oise, France, Lutetian; A, ventral view; B, dorsal view; C-E, neotype MNHN A25009, Fontenay-en-Vexin, Eure, France, Lutetian; C, ventral view; D, dorsal view; E, detailed view of the dots; F-H, MNHN A28924 (leg. Pacaud), Fercourt, Oise, France, Lutetian; F, dorsal view; G, H, detailed views of the dots; I-K, MNHN A28928 (leg. Pacaud), Parnes, Oise, France, Lutetian; I, ventral view; J, K, dorsal views (K negative view). Scale bars: A-D, F, I-K, 10 mm; E, G, H, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 18.– Distribution of the pattern types with their intermediaries (Inter.) in Seraphs chilophorus (Cossmann, 1889).

FIG. 26. — Variability of Paraseraphs tetanus Jung, 1974 in dorsal view and under UV light:A, MNHN A28948, Cuise-Lamotte (Butte-des- Usages), Oise, France, Ypresian (Cuisian); B, MNHN A28943, Cuise-Lamotte (Butte-des-Usages), Ypresian (Cuisian); C, MNHN A28944, Cuise-Lamotte (Butte-des-Usages),Ypresian (Cuisian);D, E, MNHN A28952,Cuise-Lamotte (Butte-des-Usages),Ypresian (Cuisian);E, detailed view of the dots;F, G, MNHN A28946,Cuise-Lamotte (Butte-des-Usages),Ypresian (Cuisian);G, detailed view of the dots;H, MNHN A28949,Cuise-Lamotte (Butte-des-Usages),Ypresian (Cuisian);I, MNHN A28579 (Faullummel coll.),Saint-Gobain,Aisne,France,Ypresian (Cuisian); J, MNHN A28953, Cuise-Lamotte (Butte-des-Usages), Ypresian (Cuisian); K, MNHN A28956 (Faullummel coll.), Saint-Gobain, Ypresian (Cuisian); L, MNHN A28954, Cuise-Lamotte (Butte-des-Usages), Ypresian (Cuisian); M, MNHN A28955, Cuise-Lamotte (Buttedes-Usages),Ypresian (Cuisian);N, MNHN A28958 (Faullummel coll.),Saint-Gobain,Ypresian (Cuisian);O, MNHN A28951,Cuise-Lamotte (Butte-des-Usages), Ypresian (Cuisian); P, MNHN A28950, Cuise-Lamotte (Butte-des-Usages), Ypresian (Cuisian); Q, MNHN A28957, Cuise-Lamotte (Butte-des-Usage),Ypresian (Cuisian);R, MNHN A28959 (Faullummel coll.),Saint-Gobain,Ypresian (Cuisian);A-G, Type 1; H-N, intermediaries 1-2; O-R, Type 2. Scale bars:A-D,F, H-R, 10 mm; E, G, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 28. — Paraseraphs placitus Jung, 1974 under UV light: A-G, MNHN A28961 (leg. Pacaud), Fercourt, Oise, France, Lutetian; A, ventral view; B, labral view; C, detailed view of the outer lip; D, detailed view of the adapical part of the outer lip; E, detailed view of the dots; F, dorsal view; G, detailed view of the subsutural part; H, I, MNHN A28960 (leg. Pacaud), Parnes, Oise, France, Lutetian; H, dorsal view; I, abapertural view; J-L, MNHN A28963 (Ballot coll.), Grignon, Yvelines, France, Lutetian; J, ventral view; K, dorsal view;L, detailed view of the dots; M, N, MNHN A28966 (Boule coll.), Chaussy (Les Garennes),Val d’Oise,France, Lutetian;M, detailed view of the apical part; N, dorsal view; O, P, MNHN A28964 (Ballot coll.), Grignon, Lutetian; O, dorsal view; P, labral view. Scale bars: A, B, F, H-K, N-P, 10 mm; C-E, G, L, M, 2 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 30. — Paraseraphs armoricus (Vasseur, 1882) under UV light: A-F, MNHN A28788, Saffré (Bois Gouët), Loire-Atlantique, France, Lutetian; A, ventral view; B, C, detailed views of the dots (C in negative view); D, labral view; E, detailed view of the dots; F, dorsal view). Scale bars: A, D, F, 10 mm; B, C, E, 5 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 1. — Variability of the extant species Terebellum terebellum (Linnaeus, 1758) in dorsal view and normal light:A, T. terebellum form delicatum Kuroda & Kawamoto, 1961, MNHN IM, Segond Channel, Santo, Vanuatu; B, H, I, T. terebellum form punctulorum (RÖding, 1798);C-G, T.terebellum form lineatum (RÖding,1798);B, MNHN IM,Grand Récif Sud,New Caledonia;C, MNHN IM,Lagon Nord,New Caledonia; D, MNHN IM, unknown locality; E, MNHN IM, New Caledonia; F, MNHN IM, Grand Récif Sud, New Caledonia; G, MNHN IM, Atoll de Surprise,New Caledonia;H, MNHN IM, Grand Récif Sud,New Caledonia;I, MNHN IM, Grand Récif Sud, New Caledonia. Scale bars: 10 mm. Photographs by C. Lemzaouda (MNHN).

FIG. 2. — Variability of the extant species Terebellum terebellum (Linnaeus, 1758) in dorsal view and normal light: A-D, T. terebellum form punctulorum (RÖding, 1798); E, T. terebellum form delicatum Kuroda & Kawamoto, 1961, MNHN IM, Segond Channel, Santo, Vanuatu; F-J, T. terebellum form nebulosum (RÖding, 1798); A, MNHN IM, Grand Récif Sud, New Caledonia; B, MNHN IM, Grand Récif Sud, New Caledonia; C, MNHN IM, Secteur de Balabio, New Caledonia; D, MNHN IM, Grand Récif Sud, New Caledonia; F, MNHN IM, Plateau des Chesterfield; G, MNHN IM, Plateau des Chesterfield); H, MNHN IM, Aésé Island, Santo, Vanuatu; I, MNHN IM, Baie des Citrons, Nouméa, New Caledonia; J, MNHN IM, Quatre Bancs de l’Ouest, lagoon of Nouméa, New Caledonia; K, T. terebellum, MNHN IM, Plateau des Chesterfield. Scale bars: 10 mm. Photographs by C. Lemzaouda (MNHN).