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Taxon profile

species

Tornus jullieni Adam & Knudsen, 1969

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Tornidae »  genus Tornus

Images

Tornus jullieni

Author: Rolan & Rubio

Tornus jullieni

Author: Cossignani, T. & Ardovini, R.

Taxon in country check-lists*

Africa: Tunisia, Europe: Mediterranean Sea

* List of countries might not be complete

Description

Shell nearly spherical, relatively solid, whitish and with a reticulated surface. Protoconch hyperstrophic, of about 1,75 smooth whorls, of about 330 µm diameter, and a thick rib at the start of the teleoconch. Teleoconch of about 2,25whorls, increasing slowly; the sculpture is formed by prominent spiral cords (only 2 at the beginning and 7 on the last whorl), which are crossed by numerous narrow prosocline axial ribs, about 50 in number on the last whorl; the adapical cord is the most elevated, appearing close to the suture, and the lowest one borders the umbilical infundibulum; the spiral cords on the base are also elevated. Under magnification, it can be seen that the entire surface is covered by numerous fine spiral threads of microtubercles. Umbilicus wide and deep. Aperture rounded with the outer lip with seven prominences caused by ends of the spiral cords. Dimensions: Holotype is 2.0 mm maximum dimension (diameter).
Rolan, E & Rubio, F., 2002. The family Tornidae in the East Atlantic.

Interchangeable taxa

The present species has some similarity with T africanus, but can be differentiated because in the latter, the spire is less elevated, the axial ribs are less numerous and the spiral cords less prominent in the ventral part, with more distance between them. The differences from other previously mentioned similar species are: T erici spec. nov. has a less prominent sculpture, the spiral cords are narrower and scarcely prominent, and the protoconch has 2 whorls; T aemilii spec. nov. has a more depressed shell with more prominent spiral cords, and lacks any microsculpture.
Rolan, E & Rubio, F., 2002. The family Tornidae in the East Atlantic.

Distribution

In the original description it is mentioned only from Liberia. We have found this species from Senegal to Angola. GIANNUZZI-SAVELLI EX AL. (1997, fig. 556, reproduced from ADAM & KNUDSEN, 1969) recorded this species for the Mediterranean, but the specimen that was found in this area is probably Tornus africanus and not T jullieni. So, this species has not been collected in the Mediterranean yet.
Rolan, E & Rubio, F., 2002. The family Tornidae in the East Atlantic.
Author: Jan Delsing

Similar species

Tornus africanus Adam & Knudsen, 1969
Tornus erici Rolán & Rubio, 2002

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Tornus jullieni Adam & Knudsen, 1969]
Data retrieved on: 23 November 2013
IT Repetto G., Orlando F. & Arduino G. (2005): Conchiglie del Mediterraneo, Amici del Museo "Federico Eusebio", Alba, Italy [as Tornus jullieni Adam & Knudsen, 1969]

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