The family Plectopylidae (Gastropoda, Pulmonata) in Laos with the description of two new genera and a new species
Author
Pall-Gergely, Barna
Author
Muratov, Igor V.
Author
Asami, Takahiro
text
ZooKeys
2016
592
1
26
http://dx.doi.org/10.3897/zookeys.592.8118
journal article
http://dx.doi.org/10.3897/zookeys.592.8118
1313-2970-592-1
08A7D4E2B2C84D88822930ECE9793CB2
Taxon classification Animalia Pulmonata Plectopylidae
Gudeodiscus (Gudeodiscus) messageri raheemi
Pall-Gergely
& Hunyadi, 2015
Figures 1C, 2B, 5
G-H
, 6, 9
D-G
Gudeodiscus (Gudeodiscus) messageri raheemi
2015a
Gudeodiscus (Gudeodiscus) messageri raheemi
, -
Pall-Gergely
et al., ZooKeys 473: 38-40, Figures 5D, 5E, 10A, 12
R-V
, 20, 28E, 29
F-G
, 31B, 35
D-F
.
Material examined.
11L06 Laos, Luang Prabang Province, ca. 18 km SE of Muang Xiang Ngeun, on the left side of Nam Khan, limestone, black soil in limestone pockets, clay, under rocks and logs in old forest, 455 m a.s.l.,
19°40.931'N
,
102°19.743'E
, leg. A. Abdou & I.V. Muratov, 30.10.2006, MNHN 2012-27054/38 shells (some of them are broken/juvenile) + anatomically examined specimen (Figs 1C, 2B, 5
G-H
, 6, 9
D-G
); 12L06 Laos, Luang Prabang Province, ca. 17 km SE of Muang Xiang Ngeun, on the left side of Nam Khan, limestone, black soil in limestone pockets, clay, under rocks and logs in old forest, 385 m a.s.l.,
19°41.201'N
,
102°19.197'E
, leg. A. Abdou & I.V. Muratov, 30.10.2006, MNHN 2012-27055/21 shells (some of them are broken/juvenile); 34L06 Laos, Luang Prabang Province, ca. 6 km N of Phou Khoun, limestone, clay,
under
rocks in dry secondary forest under and above cliff, 1244 m a.s.l.,
19°29.653'N
,
102°24.470'E
, leg. A. Abdou & I.V. Muratov, 16.11.2006, MNHN 2012-27056/11 shells (some of them are broken/juvenile); Laos, Vientiane Province, Tam Chang, Vang Vieng, leg. Pongrat Dumrongrojwattana, 11.06.2009., PGB/1, WM/1.
Figure 1. Shells of
Plectopylidae
species. A
Naggsia laomontana
(L. Pfeiffer, 1862) (syntype, NHMUK 20130004) B
Naggsia laomontana
(Laos, Luang Prabang Province, Ban Pak Ou, Nam Wu (opposite side of Ban Pak Ou), 364 m
20°03.48276'N
,
102°12.79912'E
, leg. Ohara, K. 13.10.2006., coll. PGB) C
Gudeodiscus (Gudeodiscus) messageri raheemi
Pall-Gergely
& Hunyadi, 2015, locality code: 11L06. Photos: T. Deli (B), B.
Pall-Gergely
(C) and H. Taylor (A). Scale represents 20 mm.
Figure 2. Living animals of Laotian
Plectopylidae
(anatomically examined specimens). A:
Naggsia laomontana
(L. Pfeiffer, 1862) B
Gudeodiscus (Gudeodiscus) messageri raheemi
Pall-Gergely
& Hunyadi, 2015. Photos: Igor Muratov.
Reproductive anatomy.
A single living specimen collected in Laos, was killed by drowning and was stored in 70 % ethanol. A part of the body was extracted from the shell and was examined anatomically. The inner parts of the genitalia, such as the gametolytic sac, the diverticulum and the spermoviduct could not be extracted.
The reproductive anatomy of
Gudeodiscus messageri raheemi
was figured in the original description (
Pall-Gergely
et al. 2015a
). The two anatomically examined Vietnamese specimens differed from each other mainly in the length of the penial
caecum
. The Laotian specimen possesses a short caecum, similar to one of the Vietnamese specimens. The length of the caecum probably has minor taxonomic value because it varies considerably within species (see also
Gudeodiscus phlyarius
in
Pall-Gergely
et al. 2015a
). The inner wall of the epiphallus of the Vietnamese specimens had three, rather low, longitudinal folds. In contrast, the Laotian specimen had a single thickened fold internally.
Remarks.
Gudeodiscus (Gudeodiscus) messageri raheemi
was described from Vietnam, where it inhabits the provinces Ninh
Binh
, Thanh
Hoa
,
Sơn
La,
Hoa
Binh
and Nghệ An. The Laotian specimens agreed in shell morphology with the Vietnamese specimens. The new Laotian localities of
Gudeodiscus messageri raheemi
represent the westernmost record of the genus (Figure 14).
Ecology.
This taxon inhabits primary or old secondary broad-leaved forests, in the humid microenvironments under leaves, logs, limestone rocks and in black soil accumulated inside limestone pockets. The live collected specimen co-occured with
Garnieria mouhoti
(L. Pfeiffer, 1862), a well-known species that is also associated with the moderate humidity of broad-leaved forests (Figure 12).