Page 3 - Mical_Nofroni_2004

On the specific validy of Chrysallida penchynati (B.D.D., 1883) and description of Chrysallida rinaldii n. sp.

conch (375 µm against 300 µm), a truncated apex, flexu-

ous costae which are fewer in number (18-20 against 22-

32), flat whorls and has an umbilical chink.

Chrysallida intermixta (Monterosato, 1884) has larger

interstices, about double of the costae, less costae (16-

22 against 22-32), a more truncated profile and a

smaller protoconch (250 µm against 300 µm).

We consider Chrysallida limitum (Brusina, 1876) as a

possible form of C. interstincta endemic to the eastern

Mediterranean Sea. However, C. limitum has more

robust costae, fewer in number, a flat-concave whorl

profile and is turriculated.

Chrysallida monterosatii (Clessin, 1900) has a conical-

truncated profile with superficial sutures, the initial

teleoconch whorls (one or two) are smooth or with

obsolete costae. The protoconch is less prominent and

the columellar fold is stronger.

Chrysallida moolenbeeki (Amati, 1987) has a very charac-

teristic protoconch with four spiral ridges.

Chrysallida suturalis (Philippi, 1844) is conical in shape

with a blunt apex, the sutures are less marked, the

whorls flat or only slightly convex. H/D ratio ranges

between 2.8 and 3.5. The protoconch is smaller (250

µm against 300 µm) and the apex is more truncated.

Chrysallida interstincta (J. Adams, 1797) is a polymor-

phic species with wide geographical and ecological

Figs 1-3 Chrysallida penchynati (B.D.D., 1883), Giannutri Island (Gr), - 47 m depth. Figs 4-6 ranges (from tide pools to bathyal mud) and many phe-
Chrysallida rinaldi n. sp., holotype, type locality. Fig. 7 Chrysallida multicostata (Jeffreys, 1884), notypes. A form similar to C. rinaldii lives in relatively
West Sahara, - 35 m depth. Scale bars: 1 mm (1, 4, 7) and 100 µm (2, 3, 5, 6). deep waters (100/200 m); about fifty shells have been
Figg. 1-3 Chrysallida penchynati (B.D.D., 1883), Giannutri Island (Gr), 47 m di profondità. examined from the Bonifacio Strait (between Sardinia

Figg. 4-6 Chrysallida rinaldi n. sp., olotipo dalla località tipo. Fig. 7 Chrysallida multicostata and Corsica), the Adriatic Sea and the Eastern Sicily.

(Jeffreys, 1884), Sahara Occidentale, 35 m di profondità. Scala di riferimento: 1 mm (1, 4, 7) e As is normally the case when many individuals are
100 µm (2, 3, 5, 6).
examined there are shells with intermediate character-

curved and forms a right angle with the columellar lip. The parietal istics between this and the littoral form. Shells from the Central

wall is covered by a thin callus. The columellar lip is arched with a Adriatic Sea are the most similar to C. rinaldii, therefore the

slight thickening deep inside the throat, difficult to observe. comparison has been made with specimens of C. interstincta

Dimensions: height 1.2 to 1.4 mm, width 0.55 to 0.65 mm, found together with C. rinaldii in the Central Adriatic Sea

h/D about 2.15. Holotype: height 1.27 mm, width 0.59 mm. (from a depth of around -90 m). Chrysallida interstincta differs

from C. rinaldii in the following characteristics:

Remarks - the shell is conical with a blunt apex, more angulated base and

The species morphologically closest to C. rinaldii is C. penchy- h/D ratio of 1.75 vs. 2.15 for C. rinaldii;

nati. However, the sculpture of C. rinaldii (one spiral ridge on - the protoconch is of the same diameter (300 µm) but wide and

the upper whorls and two on the last whorl) is common to many blunt, forming an angle of about 160° with the teleoconch axis,

other Mediterranean Chrysallida. while for C. rinaldii the protoconch is more elevated and more

Chrysallida clathrata (Jeffreys, 1848) has one spiral ridge located in tightly twisted, giving a pointed appearance to the shell;

the middle of the whorl, while in C. rinaldii the ridge is located - the costae end at the periphery while in C. rinaldii they extend

just above the abapical suture; rinaldii is furthermore of lesser size. over the base;

Chrysallida dollfusi (Kobelt, 1903) is a larger species: a specimen - the columellar lip is prominent, covering the umbilical

with three teleoconch whorls is approx. 1.9 mm high and 1 mm groove, while in C. rinaldii there is no umbilical groove;

wide, while C. rinaldii is only 1.37 mm high and 0.6 mm wide. - there is a columellar tooth instead of plica.

In addition protoconch is larger: 350 µm against 300 µm and Chrysallida penchynati differs from C. rinaldii due to the follow-

profile is conical instead of pupoid. ing characteristics:

Chrysallida emaciata (Brusina, 1866) has larger interspaces, about - the protoconch is smaller (260 µm against 300 µm) with only

twice the costae, less numerous costae (approx. 20-22), deeper one whorl instead of 1,25 whorls;

sutures, more convex whorls and a flatter protoconch. - the whorls are flat or slightly convex, while in C. rinaldii the

Chrysallida flexuosa (Monterosato, 1874) has a much larger proto- whorls are well convex;

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