Discartemon nummus

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Siriboon T, Sutcharit C, Naggs F, Rowson B, Panha S (2014) Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae). ZooKeys 401 : 45–107, doi. Versioned wiki page: 2014-04-14, version 44204, https://species-id.net/w/index.php?title=Discartemon_nummus&oldid=44204 , contributors (alphabetical order): Pensoft Publishers.

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BibTeX:

@article{Siriboon2014ZooKeys401,
author = {Siriboon, Thanit, Sutcharit, Chirasak, Naggs, Fred, Rowson, Ben AND Panha, Somsak},
journal = {ZooKeys},
publisher = {Pensoft Publishers},
title = {Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae)},
year = {2014},
volume = {401},
issue = {},
pages = {45--107},
doi = {10.3897/zookeys.401.7075},
url = {http://www.pensoft.net/journals/zookeys/article/7075/abstract},
note = {Versioned wiki page: 2014-04-14, version 44204, https://species-id.net/w/index.php?title=Discartemon_nummus&oldid=44204 , contributors (alphabetical order): Pensoft Publishers.}

}

RIS/ Endnote:

TY - JOUR
T1 - Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae)
A1 - Siriboon T, Sutcharit C, Naggs F, Rowson B
A1 - Panha S
Y1 - 2014
JF - ZooKeys
JA -
VL - 401
IS -
UR - http://dx.doi.org/10.3897/zookeys.401.7075
SP - 45
EP - 107
PB - Pensoft Publishers
M1 - Versioned wiki page: 2014-04-14, version 44204, https://species-id.net/w/index.php?title=Discartemon_nummus&oldid=44204 , contributors (alphabetical order): Pensoft Publishers.

M3 - doi:10.3897/zookeys.401.7075

Wikipedia/ Citizendium:

<ref name="Siriboon2014ZooKeys401">{{Citation
| author = Siriboon T, Sutcharit C, Naggs F, Rowson B, Panha S
| title = Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae)
| journal = ZooKeys
| year = 2014
| volume = 401
| issue =
| pages = 45--107
| pmid =
| publisher = Pensoft Publishers
| doi = 10.3897/zookeys.401.7075
| url = http://www.pensoft.net/journals/zookeys/article/7075/abstract
| pmc =
| accessdate = 2020-10-31

}} Versioned wiki page: 2014-04-14, version 44204, https://species-id.net/w/index.php?title=Discartemon_nummus&oldid=44204 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Ordo: Pulmonata
Familia: Streptaxidae
Genus: Discartemon

Name

Discartemon nummus (Laidlaw, 1929)Wikispecies linkPensoft Profile

  • Odontartemon (Discartemon) nummus Laidlaw, 1929: 259, 260, fig. 1. Type locality: Tale Sap, Singgora. Laidlaw 1933[1]: 234.
  • Discartemon nummus – Benthem Jutting 1954[2]: 87, 88. Benthem Jutting 1959[3]: 168. Richardson 1988[4]: 183.

Material examined

Khao Ok Thalu, Phatthalung, Thailand (7°37'39.1"N, 100°5'19.1"E): CUMZ 3594 (24 shells; Fig. 4G) and 6208 (12 specimens in ethanol; Figs 2A, 11D, E, 17A–E, 22B).

Description

Shell. Shell flattened, white and semi-transparent; whorls 5½, spire flattened with distinct suture. Shell surface glossy with thin transverse ridges near suture and varices present. Embryonic shell about 2½ whorls; following whorls regularly coiled. Last whorl angular with strong peripheral keel, regularly expanded; umbilicus very wide and showing all preceding whorls. Aperture triangular with sinulus; peristome continuous, thickened, expanded and reflected. Apertural dentition with a Y-shaped parietal lamella adjoining at sinulus (Fig. 4G).
Radula. Each row consists of 39–41 teeth with formula (19-20)-1-(19-20). Central tooth very small and triangular with pointed cusp. Lateral and marginal teeth undifferentiated, unicuspid and lanceolate. Latero-marginal teeth gradually reduce in size, with outermost teeth smaller and shorter than inner teeth (Fig. 22B).
Genital organs. Atrium (at) long. Proximal penis (p) long, slender; distal penis globularly enlarged. Penial sheath (ps) thin, extending about two-thirds of penis length; penial sheath retractor muscle very thin (psr), originating at genital orifice wall and inserting distally on penial sheath (Fig. 11D). Vas deferens (vd) passes through about one-fifth of penial sheath length before entering into penis distally (Fig. 11E). Penial retractor muscle (pr) thin and very long, inserting at penis and vas deferens junction.
Internal wall of atrium generally smooth (Fig. 17A); penial wall with scattered, short and transparent penial hooks, about 5 hooks/200 µm2 (Fig. 17B); hooks located on round-ovate penial papilla. Penial hooks of small size (<0.04 mm in length), slightly expanded at base, tip obtuse and directed towards genital orifice (Fig. 17C, D).
Vagina (v) short and stout, about half of penis length. Gametolytic duct (gd) a long tube extending as far as albumin gland; gametolytic sac (gs) ovate. Free oviduct (fo) long and thick; oviduct (ov) enlarged and folded; prostate gland inconspicuous and bound to oviduct. Talon (ta) small, very short and club shaped. Hermaphroditic duct (hd) bearing long seminal vesicle (sv) about one and half times longer than the length from talon to branching point of seminal vesicle (Fig. 11D).
Vaginal wall generally with smooth surface of longitudinal vaginal folds (Fig. 17E).

Remarks

Discartemon nummus was described from Tale Sap (= Lake or Lagoon), Singgora (= Songkhla). In this study, living snails were found at an isolated limestone hill near the lake in Phatthalung, about 60 km north of the type locality.
Having the smallest shell size clearly discriminates Discartemon nummus from all congeners. It is similar to Discartemon discus, which has a larger shell and a peripheral keel, lacks a sinulus, and has a semi-ovate aperture with a straight parietal lamella. Discartemon nummus can be distinguished from Discartemon khaosokensis in having a flattened spire, the last whorl regularly expanded, a triangular aperture, and a Y-shaped parietal lamella.

Taxon Treatment

  • Siriboon, T; Sutcharit, C; Naggs, F; Rowson, B; Panha, S; 2014: Revision of the carnivorous snail genus Discartemon Pfeiffer, 1856, with description of twelve new species (Pulmonata, Streptaxidae) ZooKeys, 401: 45-107. doi

Other References

  1. Laidlaw F (1933) A list of the land and fresh-water Mollusca of the Malay Peninsula. Journal Malayan Branch Royal Asiatic Society 11: 211-234.
  2. Benthem Jutting W (1954) The Malayan Streptaxidae of the genera Discartemon and Oophana. Bulletin of the Raffles Museum 25: 71-106.
  3. Benthem Jutting W (1959) Catalogue of the non-marine Mollusca of Sumatra and of its satellite islands. Beaufortia 7: 41-191.
  4. Richardson L (1988) Streptaxacea: Catalog of species, Part I, Streptaxidae. Tryonia 16: 1-326.

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