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P. Micali, I. Nofroni
- the costae are slightly shouldered at the adapical suture;
- the costae are orthocline, less numerous (20-22 on the last whorl)
and extend over the base;
- the spiral ridges are more distant and the interspaces do not have
spiral striae.
Another species to compare with C. rinaldii is C. multicostata (Jef-
freys, 1884). Type material of C. multicostata has not been found in
Jeffreys’s collection (Warén 1980: 38). Aartsen et al. (2000: 29,
30; fig. 34) designated as neotype a shell from Ria de Arousa (N
of Vigo, Spain). This locality is not very far from Cabo de Sagres
(West of Lagos, Portugal), which is the original type locality.
We report the presence of this species in the Alboran Sea for the
first time, based on 1 sh. (1.5 mm) collected between Estepona
(Spain) and Tetuan (Maroc), -25/35 m (INC) and 1 sh. (1.9 mm)
from Calaburras (Malaga, Spain) at undetermined depth (INC). A
shell from West Sahara, - 35 m depth (3.6 mm length) is here fig-
ured for comparison.
According to the previous and the new records this species seems to
be distributed from Mauritania to northern Spain, with the Mediter-
ranean presence limited to the Alboran Sea.
Chrysallida multicostata differs from C. interstincta due to its larger size
(up to 3 mm), more broadly conical form and higher number (30/40)
of ribs, which are opisthocline and flexuous (reversed-S shaped). In
very fresh specimens the shell surface is slightly iridescent. All these
characteristics also differentiate C. multicostata from C. rinaldii.
ACKNOWLEDGEMENTS
We are grateful to Virginie Heros (MNHN) and Vincenzo
Vomero (ZMR) for the study of type material of Chrysallida
penchynati, to Marco Oliverio for the SEM photographs, and to
all our friends who made available their material.
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Lavoro accettato il 12 dicembre 2002