Mauryna de Gregorio, 1880

Maxwell, Stephen J., Rymer, Tasmin L. & Congdon, Bradley C., 2021, Resolving phylogenetic and classical nomenclature: A revision of Seraphsidae Jung, 1974 (Gastropoda: Neostromboidae), Zootaxa 4990 (3), pp. 401-453 : 423

Mauryna de Gregorio, 1880 [Maxwell, this paper] nomen cladi conversum

( Seraphsidae )

Figure 6D

1880 Mauryna de Gregorio , p. 24. Tryon 1885, p. 103. Zittel 1885, p. 259. Savazzi 1988a, p. 256. Bandel 2007, p. 138.

Type. Terebellum plicatum d’Archiac & Haime, 1853 by original designation (Cossman 1904, p. 46).

RegNum Registration Number. 680.

Reference Phylogeny. Figure 3 .

Definition. The maximum clade consisting of Mauryna plicata ( d’Archiac & Haime, 1853) and all species that share a more recent common ancestor with it than with Seraphs sopitus ( Brander, 1766) , Diameza fragilis ( Defrance, 1825) , Paraseraphs tetanus Jung, 1974 or Terebellum terebellum ( Linnaeus, 1758) .

Diagnosis. The shell is moderately slender, and has an evolute growth pattern. The teleoconch has three whorls and an indistinct suture. The whorls are sculptured with axial costae. The labrum is thickened. The narrow posterior canal extends from the adapical end of the aperture to the apex, and is reflected down the dorsal side of the body whorl. The columella is straight.

Composition. Mauryna contains two species detailed herein, and belongs to the Seraphsidae outside of Seraphsinae and Pseudoterebellinae .

Remarks. Arising in the Thanetian, the clade Mauryna is restricted to the Late Paleocene and the Eocene of Southeastern Asia. However, there is a significant gap in the fossil record (Table 5). Mauryna was originally erected to hold the axially costate members of Seraphsidae , particularly Mauryna plicata ( d’Archiac & Haime, 1853) and the two synonyms Mauryna protoelegans ( de Gregorio, 1880) (= Seraphs pliciferum Bayan, 1870 ) and Seraphs pliciferum . Seraphs pliciferum lacks the distinctive posterior canal, and has involute coiling usually associated with members of the Mauryna complex ( de Gregorio 1880; Jung 1974).

There are currently two recognised members of Mauryna , namely Mauryna plicatum and Mauryna costatum Martin, 1931 , which are separated by geological time and morphology, although the morphology of Mauryna costatum is problematic due to the quality of material. Consequently, its position within the Mauryna complex is tenuous.

The Mauryna complex demonstrates a close structural affinity to Terebellopsis , but Terebellopsis lacks the heavy plications and is structurally similar to Semiterebellum Cossmann, 1889 (Rostellariidae) , and particularly to the Rimellidae .

Figures

FIGURE 3. The clade Seraphsidae Jung, 1974 derived from character analysis and contextualised with the fossil record showing the ancestral Seraphsinae and crown clade Pseudoterebellinae both new subfamilies.

FIGURE 6. Dimeza Deshayes, 1865, Miniseraphs Jung 1974 and Mauryna de Gregorio 1880. A. Diameza fragilis (Defrance, 1825), MNHN A28784, Collection de Paleontologie, Paris, length 6.9 mm (Caze et al. 2010, figs. 20A, C & E). B. Miniseraphs eratoides (Cossmann, 1889), MNHN A28785, Collection de Paleontologie, Paris, length 8.3 mm (Caze et al. 2010, figs. 20F–H). C. Miniseraphs isabella (Deshayes, 1865), MNHN A28783, Collection de Paleontologie, Paris, length 7.5 mm (Caze et al. 2010, figs. 20M–O). D. Mauryna plicata (d’Archiac & Haime, 1853), NMB H15324, length 51 mm.