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Species / Xenophora Onustus

Xenophora Onustus

Stromboidea


Original Description of Trochus onustus by Nilsson, 1827, p. 12:

  • "Tr. testa depresso-conica, anfractibus depresso-planulatis, superioribus transversim undato-plicatis, inferioribus angulatis, conchyliis eorumque impressionibus onustis."

Stratum typicum: Maastrichtian ?(Ponder, 1983), upper Cretaceous

Locus typicus: Sweden

Trochus onustus Nilsson, 1827, pl. III, fig. 4a, b

Comment Nilsson, 1827:

  • "Obs. Hujus speciei nucleum tantum inveni, cujus altitudo 10, latitude vero ad basin 15m.m. Hic vero nucleus mihi notatu dignior visus est, quam qui silentio praeteriretur. Clarum scil. est illum ad genus Phori Montf. pertinuisse, sive formam Trochi conchyliophori Lin. constituisse. Jam igitur illo prisco tempore Animalia testacea vixerunt, qua ab impetu naturae ducta, ut hostibus celarentur, conchyliis aliisque alienis rebus se circumdederunt."

Comment: Trochus onustus Nilsson, 1827 is a junior homonym of Trochus onustus Lightfoot, 1786.


History and Synonymy

1844

Trochus onustus in Goldfuss, 1844, pl. 181, fig. 10

  • "Findet sich bei Aachen und Quedlinburg"

Specimens from private collections

Xenophora sp.; Campanian, upper Cretaceous; Dielingen, Stemweder Berg, Germany; 1981; Coll. Röper & Horstmann

  1. 24 mm
  2. 30 mm
  3. 29 mm
  4. diameter 64 mm
    • Comment Wieneke: No. 1, 2, 3 are similar to Trochus onustus sensu Goldfuss, seem to belong to Acanthoxenophora because of spine. No. 4 is larger and not highspired and is similar to Trochus onustus sensu Nilsson.

Xenophora sp.; lower Campanian, upper Cretaceous; Coesfeld, Germany; 22 mm; Coll. Elmar Mai

Xenophora onusta (Nilsson, 1827); Nekum-member IVe-1, Maastricht-Formation, Maastrichtian, Cretaceous; ENCI quarry near Maastricht, Netherlands; Coll. Ger Cremers


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