New Orthalicidae (Mollusca, Gastropoda) from Venezuelan Guayana: unravelling secrets from the Lost World
Author
Breure, Abraham S. H.
text
Zootaxa
2009
2065
25
50
journal article
10.5281/zenodo.186920
695e995e-3a9a-41b8-bafa-ed8366b37ef4
1175-5326
186920
Plekocheilus (Eurytus) mundiperditi
Haas, 1955
(
Figs 6
A─C, 9E)
Plecocheilus (Eurytus)
mundi-perditi
Haas, 1955
: 378
, fig. 80.
Type
locality:
Venezuela
, State of Bolívar, Chimantá massif near Río Tirica,
2100 m
;
holotype
FMNH 52436.
Material.
Venezuela
, Estado Bolívar, Chimantá massif,
2100 m
, J.A. Steyermark leg.,
4.ii.1955
(
FMNH
52436/
holotype
, 52437/1
paratype
); Ibidem, central part of Chimantá massif, slopes bordering tributary of east branch of headwaters of Río Tirica,
2450 m
, J.A. Steyermark & J.J. Wurdack leg.,
27.iii.1955
, in
Bonnetia
forest (
FMNH
52440/1
paratype
); Ibidem, Aparamán-tepui above Río Tirica,
2120 m
, J.A. Steyermark & J.J. Wurdack leg.,
26.ii.1955
(
FMNH
52438/1
paratype
); Ibidem, Toronó-tepui, bordering valley of Caño Mojado,
2250 m
, J.A. Steyermark leg.,
21.ii.1955
(
FMNH
52439/1
paratype
); Ibidem, along trail between Río Tirica and lower summit camp,
1800 m
, J.A. Steyermark & J.J. Wurdack leg.,
26.ii.1955
(
FMNH
52441/1
paratype
); Ibidem, Eruado-tepui [= Murey-tepui],
2300 m
, R.W. McDiarmid leg.,
24.ii.1978
(UF 22945/1 +
5 juv.
, 22946/2); Ibidem, summit of Apacará-tepui, ca.
2150 m
,
5° 19’ N
62° 12’ W
, S. Gorzula &
O
. Huber leg., 11─
14.iii.1986
, in herbaceous vegetation (
RMNH
112030
/1).
Shell dimensions are given
Table 1
.
Remarks.
This species is widespread on the Chimantá massif and is characterized by its dark brown colour and its sculpture of puckered spiral bands (Fig. 9E).
TABLE 1.
Dimensions in selected species of
Plekocheilus
and
Drymaeus
in mm. Abbreviations: D, shell diameter; H, shell height; HA, height of aperture; LW, height of last whorl; M, mean; max, maximum; min, minimum; n, number of specimens measured; s, standard deviation; W, number of whorls; WA, width of aperture. For depositories of material, see section on material and methods.
| H |
D |
HA |
WA |
LW |
W |
|
Plekocheilus (Eurytus) mundiperditi
(Haas. 1955)
(n=5)
|
| M s |
47.3 3.3 |
26.1 1.6 |
26.2 1.5 |
15.2 1.1 |
40.7 2.3 |
4.4 0.1 |
| max |
52.3 |
28.4 |
28.4 |
16.9 |
43.9 |
4.6 |
| min |
44.0 |
24.5 |
24.9 |
14.3 |
38.3 |
4.3 |
Plekocheilus (Eurytus) fusitorsus
(
Oberwimmer., 1931
)
(n=2)