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Species / Rostellariella Delicatula

Rostellariella Delicatula

Stromboidea


Original description of Rostellaria delicatula by Nevill, 1881, p. 262:

  • "Distinguished at once from all the other living species of the genus by its thin, delicate, and translucent substance, in these respects showing a highly important approach to some fossil forms. Colour a pale ochraceous brown, lineated on the last whorl with four narrow white bands, each of which terminates in one of the four projecting digitate processes of the outer lip, one only of these bands appearing in the middle of the preceding four whorls; spire not quite half the entire length, apex moderately acute; whorls 10½, moderately convex, the last conspicuously tumid and like the preceding one, marked with a slight sutural depression, produced at the base into a short canaliculation, relatively less developed than in any of the other known species, this "canal" is slightly tortuously deflected, more conspicuously so than in R. magnus (Chemnitz); the first three or four whorls are sculptureless, the next three or four inconspicuously but regularly spirally striated, striae about ten in number, filiform and slightly punctured, becoming obsolete on the last two whorls, except at the base of the last of all, where they reappear more coarsely developed than before; there are also five varices, somewhat inconspicuous, at intervals on the last four whorls, which also show, under a lens, minute longitudinal striation, the striae close set, fine and flexuous; aperture oval, rather large, with the peristome thickened and denticulated with four equidistant, relatively somewhat small, digitate processes."

Locus typicus: Cheduba Island, Arrakan Coast, Bay of Bengal, Myanmar (Burma)


History and Synonymy

Rostellariella delicatula (G.Nevill, 1881:262) (Rostellaria)

  • Syn.: Tibia (Rostellariella) delicatula nana Romagna Manoja, 1977: 11 [unavailable; although Romagna Manoja provided a description and figured specimens (p. 12, bottom figs) no specimens were indicated as types, nor repositories of these specimens were provided]
  • ? Syn.: Rostellaria (s.str.) delicatula perlonga Koperberg, 1931: 126 (†)
  • Syn.: Tibia delicatula var. quatuordenticulata Melvill & Standen 1905: 103
  • Syn.: Tibia delicatula var. quinquedenticulata Melvill & Standen 1905: 103
  • Syn.: Tibia delicatula var. tridenticulata Melvill & Standen 1905: 103

1905

Rostellaria delicatula in Melvill and Standen, 1905

1931

Description of Rostellaria delicatula subsp. perlonga by Koperberg, 1931:

  • "Schon Kuenen erkannte die Identität der vorliegenden Stücke mit der R. delicatula NEVILL von Tesch (95, II), die nachher meinerseits in Delft bestätigt wurde. Nur scheinen die Jonkerschen Exemplare alle schlanker als die rezenten zu sein (R.M.N.H.: Meerbusen von Bengalen) und ist der Hinterrand des Mundes stärker aufwärts gebogen, die Kolumella aber weniger gekrümmt; auch weicht die Form des Protokonchs ab. Unter Hinweis auf die Beschreibung von Tesch wäre noch zu bemerken: ein polygyrer, haubenförmig angesetzter Protokonch mit·sehr winzigem Nukleus und gewölbten, glatten Anfangswindungen, gefolgt von konoiden, deren letzte nahe an der Vordersutur eine ziemlich deutliche Karina aufweist. Die Mittelwindungen glatt, die Sutur untief. Erst von dem vierten oder fünften Umgange an treten an der Hintersutur 1- 3 Spiralfalten auf, zu denen sich nachher noch schwächere vordere gesellen ohne die ersteren jemals zu überherrschen. Sonst sind die Schalen fast glatt, und auch nicht mit älteren Mundsäumen verziert wie Tesch für seine Stücke angibt. Doch zeigen einige, wie dieser Autor schon bemerkte, eine mehr auffällige Spiralskulptur (95, II)."
  • Locus typicus: Timor, Indonesia
  • Stratum typicum: Pliocene

Rostellaria delicatula perlonga Koperberg, 1931; Pliocene; Timor Island, Indonesia; 61 mm; Coll. Naturalis; Copyright Naturalis

Rostellaria delicatula perlonga Koperberg, 1931; Pliocene; Timor Island, Indonesia; Coll. Naturalis; Copyright Naturalis

Rostellaria delicatula perlonga Koperberg, 1931; Pliocene; Timor Island, Indonesia; Coll. Naturalis no. 17783; Copyright Naturalis

Rostellaria delicatula perlonga Koperberg, 1931; Pliocene; Niki-Niki, Timor Island, Indonesia; Coll. Naturalis no. 13824; Copyright Naturalis


Specimens from private collections

Rostellariella delicatula (Nevill, 1881); Coll. Gijs Kronenberg

  • top row:
    • left: off Madras, India; 1988; Dredged; no. 1538
    • middle: off Madras, India; Dredged; no. 0395
    • right: Andaman Sea; no. 5710
  • bottom row:
    • left: Bay of Bengal, Bangladesh; Trawled; no. 5709
    • Thailand; no. 0084
    • Andaman Sea; no. 5711
    • right: Andaman Sea; no. 5711

Rostellariella delicatula (Nevill, 1881); Arabian Sea; 77 mm; Coll. Paul Merril

Rostellariella delicatula (Nevill, 1881); Coll. René Vanwalleghem


References

  • James Cosmo Melvill and Robert Standen, 1904; Rostellaria delicatula Nevill: Notes upon its distribution and limits of variation. Journal of conchology 11:6, 161-163.
  • Nevill, 1881
  • P.G. Oliver, 2001. Functional morphology and description of a new species of Amygdalum (Mytiloidea) from the oxygen minimum zone of the Arabian Sea; J. Moll. Stud., 67 (2001), pp. 225–241
  • E. Ramirez-Llodra & C. Olabarria, 2005. Aspects of the distribution, population structure and reproduction of the gastropod Tibia delicatula (Nevill, 1881) inhabiting the oxygen minimum zone of the Oman and Pakistan continental margins; Journal of Sea Research 54 (2005) 299–306.
  • N.V. Subba Rao, 1977. On the collection of Strombidae (Mollusca: Gastropoda) from the Bay of Bengal, Arabian Sea and Western Indian Ocean, 2. Genera Lambis, Terebellum, Tibia and Rimella; J. Mar. Biol. Assoc. UK, 19 (1977), pp. 21–34.
  • J. Woodmason & A. Alcock, 1891. On Rostellaria delicatula; Ann. Mag. Nat. Hist. Lond., 7 (1891), pp. 16–17.

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