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Species / Aporrhais Firma

Aporrhais Firma

Stromboidea


Original Description of Aporrhais firma by Gardner, 1884:

  • "This comes next in point of size to the larger Oldhaven species, measuring 40 mm. in length, by at least 32 across the wing. The spire is very blunt, the whorls much wider than high and tumid. The ribs are curved, oblique, strongly marked, fine, but becoming coarser towards the last whorl, and breaking into three rows of nodes on the body-whorl, the upper being far more prominent and rounded than the rest; the striae are inconspicuous, The body-whorl is more angulated than usual. The wing is short, and is produced into two digits more equal than than in the previous species, and is continued to the apex of the spire. The canal is long.

Locus typicus: Brockenhurst, Hampshire, Great Britain

Stratum typicum: Headon Hill Formation (?), Priabonian, Eocene

Aporrhais firma Gardner, 1884; pl. XVII, fig. 1, 2

Aporrhais firma Gardner, 1884; Syntype; Headon Beds, upper Eocene; Brockenhurst, Hampshire, Great Britain; Coll. BMNH no. G.62925

Aporrhais firma Gardner, 1884; Syntype; Headon Beds, upper Eocene; Brockenhurst, Hampshire, Great Britain; Coll. BMNH no. G.62925

Aporrhais firma Gardner, 1884; Syntype; Headon Beds, upper Eocene; Brockenhurst, Hampshire, Great Britain; Coll. BMNH no. G.61996


History and Synonymy

1938

Wrigley, 1938, p. 82 about Aporrhais speciosa (Schlotheim)

  • Strombites speciosus Schlotheim, 1820, p. 155.
  • Rostellaria margerini de Koninck, 1837, p. 28, pl. 2, fig. 6 and pl. 3, fig. 3
  • Aporrhais firma Starkie Gardner, 1884, p. 533, pl. 17, figs. 1, 2. Gardner used margerini for another species of the Oldhaven beds and needlessly created firma for the true margerini (=speciosa) of the Brockenhurst horizon.
  • Aporrhais speciosa von Koenen, 1891, p. 695, pl. 50, figs. 11a, b, 12a, b. The restoration of the broken lip in these figures is fantastic.
  • Distribution. - Bracklesham beds, Selsey (fig. 47), where the complete shell is unique. The flattened distortion of this specimen, its colour, etc., suggest that it came from the Brooh-bed and this is confirmed by the recent discovery by Mr. Venables, at that horizon at Selsey, of a portion of an outer lip which may well belong to this species. With these exceptions, Aporrhais is unknown from the Lutetian and Auversian Bracklesham beds or from the Barton beds. Several large examples occur in the basal Middle Headon beds at Brockenhurst (fig. 50) and at Whitecliff Bay. Throughout the Oligocene of N. Germany and especially known by large examples in the Rupelian Middle Oligocene of that country and of Belgium.
  • The general description of a typical A. sowerbii is largely applicable to this "species": speciosa is generally broader with the carinal nodes very bold and distant; frequently it has a fourth ridge in front of the usual three and the rear of the outer lip is continued as a flange across all the whorls to the apex.
  • The foregoing series of Aporrhais from the lower London Clay to the Oligocene, commences with a form (fig. 42) which belongs to Gabb's genus Arrhoges and by a gradual development of carinae and tubercules, and by the gradual extension of the rear lip-flange across the whorls towards the apex ends in a form (fig. 50) which is really comparable with Aporrhais pespelecani. For this reason I think that Arrhoges is superfluous.

Aporrhais speciosa in Wrigley, 1938, pl. 6, fig. 47. Bracklesham beds, Bracklesham bay, B.M., G. 8935. Ogle collection.

Aporrhais speciosa (von Schlotheim, 1820); Bracklesham Group (formerly Bracklesham Beds), middle Eocene; Bracklesham Bay, West Sussex, Great Britain; Coll. BM(NH) no. G.8935; Copyright BM(NH)

Aporrhais speciosa in Wrigley, 1938, pl. 6, fig. 50. Base of the Middle Headon beds, Brockenhurst. B.M., G. 61996.

1958

Aporrhais speciosa in Klyushnikov, 1958, pl. 34, fig. 8

  • Loc.: Mandrykovka, Ukraine

Aporrhais cf. firma Gardner, 1884; middle Headon Beds, Priabonian, Eocene; Whitecliff, Isle of Wight, Great Britain; 34 mm; Coll. J.F. Jackson [Museum of Isle of Wight Geology MIWG1928]; Photo & Copyright Alan Morton

Aporrhais cf. firma Gardner, 1884; middle Headon Beds, Priabonian, Eocene; Whitecliff, Isle of Wight, Great Britain; 14 mm; Photo & Copyright Alan Morton

Aporrhais speciosa (von Schlotheim, 1820); upper Eocene, Priabonian; Brockenhurst, Hampshire, Great Britain; Coll. BM(NH) no. 71377; Copyright BM(NH)

Aporrhais aff. firma Gardner, 1884; Rybalsk Quarry, Dnepropetrovsk, Ukraine; Priabonian, Eocene; Coll. Stichting Schepsel Schelp, no. SSS 61225

Aporrhais cf. firma Gardner, 1884; Sands of Grimmertingen, Lattorfian, Oligocene; Grimmertingen, Limburg, Belgium; Coll. Stichting Schepsel Schelp no. SSS 14549


References

  • Gardner, J.S. 1884. British Eocene Aporrhaidae; The Geological Magazine N.S., dec. 3, vol. 1, No. 12, p. 529-534, pl. 17.
  • Klyushnikov,M.N., 1958. Stratigraphy and fauna of the lower Tertiary deposits of Ukraine. Transactions of the Institute of Geological Sciences of the Ukrainian Academy of Sciences, Kiev, pp. 1-455.
  • Wrigley, 1938

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