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Species / Aporrhais Scaldensis

Aporrhais Scaldensis

Stromboidea


Original Description by van Regteren Altena, 1954, p. 48:

  • "A small species of Aporrhais. Whorls, at least 7 (the protoconch is missing in all my specimens). Sculpture consisting of fine spirals, and, on the second, third, and fourth digitations of the outer lip. The first of these spiral ridges is the continuation of the shoulder of the whorls of the spire. The knobs show a tendency to vanish on the second half of the last whorl. Outer lip with four fingerlike processes: the first adhering to the penultimate and ultimate whorls of the spire, and separated from the second by a deep sinus. The second is separated from the third by a shallow sinus (in the specimen figured by Harmer it is exceptionally deep). The fourth is no more than a small knob hardly protruding from the margin of the outer lip. Siphonal canal closed, recurved, rather long. Altitude 19 mm, maximum diameter 15 mm, minimum diameter 7 mm (holotype). The altitude of the paratypes varies from 18 to 26 mm, the mean being about 20,5 mm."

Locus typicus: Reek (boring, depth between 14 and 31,80 m), Noord-Brabant, The Netherlands

Stratum typicum: Scaldisian, Pliocene

Types: "Haarlem, Geologische Stichting, afdeling Geologische Dienst: Holotype, from a depth of between 14 and 31,80 m in a boring at Reek, province of Noord-Brabant. Paratypes, 18 specimens recorded by BEETS under the above mentioned name from the following localities: Oss (6), Reek 24 (5), Dorst 84 (1), Dorst 85 (1), Vlissingen 67-73 (4), Kouderke (1). Other specimens labelled by BEETS appear to be either too badly preserved for their identity to be certain, or they belong to A. pespelicani (L.). Haarlem, Teyler Museum: Paratypes, 4 specimens from Kruisschans near Antwerp. Leiden, Rijksmuseum van Natuurlijke Historie: Paratypes, Domburg, beach, 1 specimen; Ritthem, beach, 6 specimens; Westerschelde, 19 paratypes."

Van Regteren Altena, 1954, p. 48:

  • "Discussion. - This [Aporrhais scaldensis] is the common Aporrhais from the Scaldisien-Poederlien of Antwerp. In the Institut Royal des Sciences Naturelles at Brussels I found that it occurs with a form of Aporrhais pespelicani (L.) which is at least very similar to the subspecies quadrifidus Da Costa. The new species has often been considered a small variety of A. pespelicani. In Brussels I could compare it with a series of A. pespelicani (L.) var. minor B.D.D. in the Dautzenberg collection. There appears to be hardly any difference in size, but scaldensis is a much more delicate shell, in which the knobs on the shoulder of the whorls of the spire are less coarse, closer together, and prolonged in an axial direction. In A. pespelicani these knobs do not tend to vanish on the second half of the last whorl. Harmer identified the present species with A. serresianus macandreae Jeffreys. That form has, however, a larger and more solid shell, with longer digitations of the outer lip of the aperture, and more pronounced knobs on the second half of the last whorl. Chenopus anglicus D'Orbigny, 1852, was based on an English specimen figured by J. Sowerby and a Belgian one figured by Nyst. The latter specimen seems to have belonged to the present form, and the former to A. pespelicani quadrifidus Da Costa. As far as I know no lectotype has ever been selected for Chenopus anglicus. In view of the specific name the specimen figured bij Sowerby is here selected as such."

Van Regteren Altena, 1954, p. 48 cited:

  • "1878 Chenopus pespelicani var. anglica Nyst, Ann. Mus. R. Hist. Nat. Belg., vol. 3 (planches), pl. 6 figs. 11a, b."
  • "1918 Aporrhais Serresianus var. Macandreae Harmer, Plioc. Moll., vol. 1, pl. 41, fig. 34 (non Jeffreys)."
  • "1946 Aporrhais (Aporrhais) pespelicani (partim) Beets, Meded. Geol. Stichting, (C-IV-I) no. 6, p. 57 (non Linnaeus)."

Specimens from private collections

Aporrhais scaldensis van Regteren Altena, 1954; Pliocene; Kallo near Antwerp, Belgium; Coll. Ger Cremers


References


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