Discartemon discus

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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 44251, https://species-id.net/w/index.php?title=Discartemon_discus&oldid=44251 , 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 44251, https://species-id.net/w/index.php?title=Discartemon_discus&oldid=44251 , 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 44251, https://species-id.net/w/index.php?title=Discartemon_discus&oldid=44251 , 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 = 2020-11-30

}} Versioned wiki page: 2014-04-14, version 44251, https://species-id.net/w/index.php?title=Discartemon_discus&oldid=44251 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Ordo: Pulmonata
Familia: Streptaxidae
Genus: Discartemon

Name

Discartemon discus (Pfeiffer, 1853) [“1851”]Wikispecies linkPensoft Profile

Material examined

This species was described from specimens from the H. Cuming collection. The number of specimens was not indicated, but only one set of measurements was given in the original description. Only one specimen from the H. Cuming collection at NHMUK has Pfeiffer’s handwriting on the species name label. It is identical to the illustration and measurements in Pfeiffer (1854[2]: 394, 395, pl. 145, figs 15–17) and is designated here as the lectotype to stabilize the name: NHMUK 20130684 (Fig. 4A).
Lectotype of Streptaxis paradiscus Möllendorff, 1900 SMF 108534 (Fig. 4B) and paralectotypes SMF 108535 (5 shells). Marble Mountain, Da Nang, Vietnam (16°0'13.4"N, 108°15'49.1"E): CUMZ 6001 (39 shells; Fig. 4C), 6257 (6 specimens in ethanol; Figs 11A, B, 22A). Annam: MNHN Jousseaume Coll. (1 shells), MNHN Denis Coll. (2 shells), MNHN Letellier Coll. (3 shells), NHMW 40858 (2 shells), NHMUK 1901.12.23.13–14 (2 shells), NHMUK Trechmann coll. Acc. 2176 (2 shells), NHMUK Connolly Coll. Acc. 2154 (1 shell), RMNH Fruhstorfer Coll. 45a (1 shell), RMNH Saverbgen Coll. (2 shells). Tourane [=Da Nang], Central Annam: NHMUK McAndrew coll. Acc. 1563 (2 shells). Touraine, Annam: NHMW Rusnov Coll. R 283 (2 shells), NMW 1955.158.25251 (1 shell), RMNH Verdcourt Coll. (2 shells), ZMB 6619 (3 shells), ZMB 52300 (3 shells). Phuc-Son, Annam: NHMW 31140 (1 shell).

Description

Shell. Shell flattened, white and translucent; whorls 6–6½; spire flattened with distinct suture. Shell surface glossy, smooth with growth lines and varices present. Embryonic shell large, about 2½ whorls, with a smooth surface; following whorls regularly coiled. Last whorl angular, regularly expanded; umbilicus very wide, shallow and showing all preceding whorls. Aperture semi-ovate; peristome discontinuous, thickened, expanded and reflected; apertural dentition with only one parietal lamella (Fig. 4A–C).
Radula. Each row consists of 61–67 teeth with formula (30-33)-1-(30-33). 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. 22A).
Genital organs. Atrium (at) short; penis (p) long and slender. Penial sheath (ps) thin, extending about half to third-fourths of penis length; penial sheath retractor muscle (psr) very thin, originating at atrium and inserting at distal end of penial sheath (Fig. 11A). Vas deferens (vd) passes through a very short part of penial sheath before entering into penis distally (Fig. 11B). Penial retractor muscle (pr) thin and very long, inserting at penis and vas deferens junction.
Vagina (v) long, cylindrical, about two thirds of penis length. Gametolytic duct (gd) a long tube extending as far as albumin gland; gametolytic sac (gs) ovate. Free oviduct (fo) short; oviduct (ov) enlarged and folded. Prostate gland inconspicuous and bound to oviduct. Talon (ta) small. 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. 11A).
Pallial system. Excretory system typically sigmurethran and without mantle gland. Heart (h, auricles and ventricle) located left of kidney (on right in Fig. 11C). Pulmonary cavity approximately three times longer than broad. Pulmonary vein (puv) and venation on lung roof distinct and well developed. Kidney (k) very short, located at posterior of pulmonary cavity. Ureter (ur) sigmoid, closed tube arising from apex of kidney, extending along right side of kidney, recurving adjacent to rectum (rt). Anus (a) adjacent to pneumostome (pn) on mantle collar.

Table 1. Shell measurements of Discartemon spp (Discartemon discus-group). Specimen collections and catalogue numbers indicated in parentheses.
Species and locality and CUMZ nos No. of specimens Ranges, mean ± S.D. in mm of: Number of whorls
Shell height Shell width H/W ratio
Discartemon discus (Pfeiffer, 1853)
Da Nang, Vietnam: (6001, 6257) 45 4.2–6.7 5.0±0.43 11.78–14.26 12.9±0.59 0.3–0.5 0.4±0.03 6–6½
Discartemon nummus (Laidlaw, 1929)
Khao Ok Thalu, Phatthalung: (3594) 24 2.4–3.3 2.8±0.21 6.1–7.2 6.5±0.27 0.4–0.5 0.4±0.03
Discartemon khaosokensis Panha & Burch, 1998
Khao Sok N. P., Suratthani: (6242, 6243) 5 3.4–4.0 3.6±0.26 11.2–12.4 11.8±0.47 0.3–0.3 0.3±0.02 5½–5¾
Discartemon discadentus sp. n.
Wat Tam Yai, Suratthani: (6209, 6244, 6258) 16 3.9–5.8 5.0±0.49 10.1–15.4 11.9±0.32 0.4–0.5 0.4±0.04 6
Wat Tam Wararam, Suratthani: (3571) 15 5.5–7.0 6.3±0.33 12.4–13.6 13.1±0.32 0.4–0.5 0.4±0.02 6
Discartemon discamaximus sp. n.
Tam Namphud, Phangnga: (6005, 6245) 5 4.7–5.0 4.9±0.10 12.4–13.6 14.3±0.49 0.3–0.4 0.3±0.02 7
Tam Kobe, Phangnga: (3669, 6197) 17 4.4–5.6 4.9±0.38 10.8–13.7 12.3±0.76 0.4–0.4 0.4±0.02 7
Discartemon circulus sp. n.
Tam Phannara, Nakhon Si Thammarat: (3665, 6246, 6262) 23 3.0–4.5 3.7±0.32 7.7–9.5 8.6±0.45 0.4–0.5 0.4±0.03 5½–6
Discartemon deprima sp. n.
Khao Hup Ta Hae, Prathiew, Chumphon: (3573, 6247) 7 2.5–3.4 2.9±0.30 8.2–10.3 9.1±0.72 0.3–0.3 0.3±0.02 5–5½
Ban Tam Thong, Prathiew, Chumphon: (6259) 5 3.1–3.8 3.5±0.27 9.5–11.2 10.1±0.68 0.3–0.3 0.3±0.01 5–5½
Discartemon expandus sp. n.
Klong Hoy, Suratthani: (3664, 6248) 16 3.6–4.3 4.0±0.30 8.2–10.9 9.9±0.84 0.4–0.5 0.4±0.03 5½–6

Remarks

The type specimen discovered in the H. Cuming collection at NHMUK elucidates two issues. Firstly, Streptaxis paradiscus Möllendorff, 1900 has been recognized as a separate species in many works (Möllendorff 1900[15], Gude 1903[5], Kobelt 1906[10], Benthem Jutting 1954[11], Zilch 1960[12], 1961[13], Schileyko 2011[14]). However, based on the type specimens, Discartemon discus and Streptaxis paradiscus are identical in all shell characters. Therefore, we officially place Streptaxis paradiscus as a junior subjective synonym of Discartemon discus. Second, Discartemon discus had an unknown type locality and range (Pfeiffer 1851[16]: 252). From the new material and the type locality of Streptaxis paradiscus, the distribution of this species is demarcated to several localities in the area of Da Nang, Vietnam (Schileyko 2011[14]).
The record of Streptaxis discus from Brazil, mentioned in Bourguignat (1899)[6] is almost certainly an error, since it is far beyond the distribution range of the genus. The specimen figured in Simone (2006[17]: 191, fig. 708, reg. NHMUK Trechmann Acc. 2176) has the locality Annam [= central Vietnam].

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. Pfeiffer L (1853) Monographia Heliceorum Viventium. Volume 3. Brckhaus FA, Lipsiae, 711 pp.
  2. 2.0 2.1 Pfeiffer L (1854) Die Schnirkelschnecken nebst deb zunäehst verwandten Gattungen. Systematisches Conchylien- Cabinet von Martini und Chemnitz 1 (12) (3): 291–524, pl. 145, figs 15–17.
  3. Ancey C (1884) Sur les divisions proposées dans le genre Streptaxis. Le Naturaliste 50: 399.
  4. Tryon G (1885) Manual of Conchology, Structure and Systematic, with Illustrations of the Species. Volume 1. The Academy of Natural Science of Philadelphia, 364 pp. doi: 10.5962/bhl.title.6534
  5. 5.0 5.1 5.2 Gude G (1903) A synopsis of the genus Streptaxis and its allies. Proceedings of the Malacological Society of London 5: 201-244.
  6. 6.0 6.1 Bourguignat J (1899) Mollusques de Ľafrique Équatoriale de Moguedouchou a Bagamoyo et de Bagamoyo au Tanganika. Imprimerie D. Dumoulin, Paris, 229 pp.
  7. Richardson L (1988) Streptaxacea: Catalog of species, Part I, Streptaxidae. Tryonia 16: 1-326.
  8. Schileyko A (2000) Treatise on recent terrestrial pulmonate molluscs: Rhytididae, Chlamydephoridae, Systrophiidae, Haplotrematidae, Streptaxidae, Spiraxidae, Oleacinidae and Testacellidae. Ruthenica Supplement 2 Part 6: 731–880.
  9. Ancey C (1904) Notes critiques et synonymiques. Journal de Conchyliologie 52: 288-316.
  10. 10.0 10.1 10.2 Kobelt W (1905–1906) Die Raublungenschnecken (Agnatha). Zweite Abtheilung: Streptaxidae und Daudebardiidae. Systematisches Conchylien- Cabinet von Martini und Chemnitz. 1 (12b) (2): 1–96, pls 42–59 [1905]; 97–211, pls 60–71 [1906].
  11. 11.0 11.1 Benthem Jutting W (1954) The Malayan Streptaxidae of the genera Discartemon and Oophana. Bulletin of the Raffles Museum 25: 71-106.
  12. 12.0 12.1 Zilch A (1960) Gastropoda, Euthyneura. In: Schinderwolf O (Ed) Handbuch der Paläozoologie. Gebrüder Borntraeger, Berlin 6: 401–834.
  13. 13.0 13.1 Zilch A (1961) Die Typen und Typoide des Natur-Museums Senckenberg 24: Mollusca, Streptaxidae. Archiv für Molluskenkunde 90: 79-120.
  14. 14.0 14.1 14.2 Schileyko A (2011) Check-list of land pulmonate molluscs of Vietnam (Gastropoda: Stylommatophora). Ruthenica 21: 1-68.
  15. Möllendorff O (1900) Zur binnenmollusken-fauna Annans III. Nachrichtsblatt der Deutchen Malakozoologischen Gesellschaft 32: 117-121.
  16. Pfeiffer L (1851) Description of fifty-four new species of Helicea, from the collection of Hugh Cuming, Esq. Proceedings of the Zoological Society of London 1851: 252-263. doi: 10.1111/j.1096-3642.1851.tb01174.x
  17. Simone L (2006) Land and freshwater molluscs of Brazil. Museum de Zoologia Universidade de São Paulo, Brazil, 390 pp.

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