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Species / Rostellaria Bispinosa

Rostellaria Bispinosa

  • Rostellaria bispinosa Phillips, 1829

Rostellaria bispinosa (?) Phillips, 1829, pl. IV, fig. 32

  • from Scarborough, Lower Calcareous grit.

Rostellaria bispinosa Phillips, 1829, pl. VI, fig. 13

  • from Scarborough, Wilts, &c.; Kelloways Rock

History and Synonynmy


Comment by Hudleston, 1884, p. 151:

  • "This must be regarded as a group rather than as a species. In his earlier edition Phillips referred the fossil from the Lower Calcareous Grit (pl. iv. fig. 13) and the fossil from the Kelloway Eock (pl. vi. fig. 13) both to Rostellaria bispinosa, though with a query; but in the edition of 1875, although Al. bispinosa is quoted from the L. C. G. and K. R., the fossil, depicted in pl. vi. fig. 13, is referred to Al. myurus, Desl., and as coming from the Cornbrash. It is perfectly true that there are representatives of Al. myurus in the Yorkshire Cornbrash, but none of them are like Phillips's figure (vi. 13), which represents a wide-angled variety of the bispinosa group. Both Phillips's types were provided by Williamson. I have not been able to trace them. The question whether the fossils of the L. C. G. and K. R. should be placed under the same specific designation was partly discussed in the Corallian Gasteropoda1 (Geol. Mag. 1880, p. 532), and allusions were made to the possible foreign equivalents. It would be a hopeless task to attempt to follow the synonymy or to correlate with accuracy the various modifications of this wide-spread group, which has been further complicated by its having been confounded with Alaria trifida, a still more widely extended species. Although there are, doubtless, important differences between some specimens which I have referred to Al. bispinosa, yet such differences are chiefly those of size; the general character of the spire, body-whorl and ornaments in all being very similar. For Yorkshire this species culminates in the Kelloway Rock, and here it is that the robust wide-angled variety is most conspicuous, though the narrower forms are not deficient."
  • 1 "In describing a specimen from the L. C. G. it was suggested that it might have a two-fingered wing. This I now believe to be a mistake. The chief characteristic of the bispinosa group is the one lateral digitation, which together with the canal sheath or tail constitute two long processes almost at right angles to each other."

Alaria bispinosa var. in Hudleston, 1884, pl. VI, fig. 7, 7a

Alaria bispinosa var. elegans Hudleston, 1884 pl. VI, fig. 8, 8a

Alaria bispinosa var. pinguis Hudleston, 1884, pl. VI, fig. 9, 9a

Alaria bispinosa var. pinguis Hudleston, 1884, pl. VI, fig. 10, 10a

Alaria bispinosa var. pinguis Hudleston, 1884; Syntypes; Kellaways Rock (Kelloway Rock), Callovian, Jurassic; Scarborough, Yorkshire, England; Copyright Sedgwick Museum of Earth Sciences


Barbara J. Pyrah, 1977. CATALOGUE OF TYPE AND FIGURED FOSSILS IN THE YORKSHIRE MUSEUM: PART 3, Proceedings of the Yorkshire Geological Society, 41, 437-460.

Alaria bispinosa (Phillips)

  • YM 249. Jurassic, Kelloway Rock; near Scarborough.
  • Hudleston 1884, p. 151, pl. VI, fig. 7.

Specimens from private collections

Rostellaria bispinosa Phillips, 1829; Callovian, middle Jurassic; Ashton Keynes, Wiltshire County, South West Region, England; Coll. Ulrich Wieneke

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