A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea
Author
Harzhauser, Mathias
Author
Landau, Bernard
text
Zootaxa
2016
4210
1
1
178
journal article
37280
10.11646/zootaxa.4210.1.1
e782e07d-76b7-4e9b-ba34-ed3286254ec6
1175-5326
252966
D39416B8-CF85-440B-84C2-D4380BECC4E3
Genus
Lautoconus
Monterosato, 1923
Type species (by original designation):
Conus mediterraneus
Hwass in
Bruguière, 1792
. Recent, Mediterranean Sea.
Note.
Tucker & Tenorio (2009)
gave few shell features by which to distinguish members of the genus
Lautoconus
Monterosato, 1923
. The shells are turgid in shape with convex sides. The protoconch is paucispiral. The whorl tops are ornamented with cords that reach the middle spire whorls and often persist. The subsutural flexure is shallow to moderate in depth.
Puillandre
et al
. (2014a
,
b
) synonymized
Varioconus
da
Motta, 1991
with
Lautoconus
Monterosato, 1923
based on molecular data. According to
Tucker & Tenorio (2009)
the genus
Varioconus
da
Motta, 1991
is characterised by shells with smooth spire whorls, a rounded, indistinct shoulder, a shallow subsutural sinus and a paucispiral protoconch. For their molecular phylogeny
Puillandre
et al
. (2014a
,
b
) analysed numerous species, traditionally placed in
Lautoconus
but only two species, which are listed as
Varioconus
by
Tucker & Tenorio (2009)
(
Conus xicoi
Röckel, 1987
and
C. franciscoi
Rolán & Röckel, 2000
). Unfortunately,
Conus variegatus
Kiener, 1845
, the
type
species of
Varioconus
, is missing from their analysis. Therefore, the synonymization remains debateable.
The main difference in shell characters listed by
Tucker & Tenorio (2009)
is the presence of cords on
Lautoconus
and their absence in
Varioconus
. The characteristic pyriform outline of most species placed in
Varioconus
is not a distinguishing feature but may also be developed by
Lautoconus
species such as
Lautoconus mercator
(Linnaeus, 1758)
. The radula morphologies as described by
Tucker & Tenorio (2009)
do not require a separation and their West African geographic distribution is identical. Consequently, we follow
Puillandre
et al
. (2014a
,
b
) and treat
Varioconus
as subjective junior synonym of
Lautoconus
.
The genus
Lautoconus
is represented in the middle Miocene Paratethys Sea by several species, which comprise moderately small to moderately large and medium-wide to wide shells with low to medium high spires; spiral cords on the sutural ramp may be present or replaced by faint spiral threads. The subsutural flexures are variable in depth, ranging from very shallow to deep, are usually moderately curved and moderately asymmetrical.
To our knowledge, none of the extant
Lautoconus
(and
Varioconus
) species has a tuberculate early spire or develops nodes. Therefore, we exclude tuberculate species from
Lautoconus
.