Zospeum tholussum

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Weigand A (2013) New Zospeum species (Gastropoda, Ellobioidea, Carychiidae) from 980 m depth in the Lukina Jama – Trojama cave system (Velebit Mts., Croatia). Subterranean Biology 11 : 45–53, doi. Versioned wiki page: 2013-08-30, version 36549, https://species-id.net/w/index.php?title=Zospeum_tholussum&oldid=36549 , contributors (alphabetical order): Pensoft Publishers.

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BibTeX:

@article{Weigand2013SubterraneanBiology11,
author = {Weigand, Alexander M.},
journal = {Subterranean Biology},
publisher = {Pensoft Publishers},
title = {New Zospeum species (Gastropoda, Ellobioidea, Carychiidae) from 980 m depth in the Lukina Jama – Trojama cave system (Velebit Mts., Croatia)},
year = {2013},
volume = {11},
issue = {},
pages = {45--53},
doi = {10.3897/subtbiol.11.5966},
url = {http://www.pensoft.net/journals/subtbiol/article/5966/abstract},
note = {Versioned wiki page: 2013-08-30, version 36549, https://species-id.net/w/index.php?title=Zospeum_tholussum&oldid=36549 , contributors (alphabetical order): Pensoft Publishers.}

}

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TY - JOUR
T1 - New Zospeum species (Gastropoda, Ellobioidea, Carychiidae) from 980 m depth in the Lukina Jama – Trojama cave system (Velebit Mts., Croatia)
A1 - Weigand A
Y1 - 2013
JF - Subterranean Biology
JA -
VL - 11
IS -
UR - http://dx.doi.org/10.3897/subtbiol.11.5966
SP - 45
EP - 53
PB - Pensoft Publishers
M1 - Versioned wiki page: 2013-08-30, version 36549, https://species-id.net/w/index.php?title=Zospeum_tholussum&oldid=36549 , contributors (alphabetical order): Pensoft Publishers.

M3 - doi:10.3897/subtbiol.11.5966

Wikipedia/ Citizendium:

<ref name="Weigand2013Subterranean Biology11">{{Citation
| author = Weigand A
| title = New Zospeum species (Gastropoda, Ellobioidea, Carychiidae) from 980 m depth in the Lukina Jama – Trojama cave system (Velebit Mts., Croatia)
| journal = Subterranean Biology
| year = 2013
| volume = 11
| issue =
| pages = 45--53
| pmid =
| publisher = Pensoft Publishers
| doi = 10.3897/subtbiol.11.5966
| url = http://www.pensoft.net/journals/subtbiol/article/5966/abstract
| pmc =
| accessdate = 2021-07-08

}} Versioned wiki page: 2013-08-30, version 36549, https://species-id.net/w/index.php?title=Zospeum_tholussum&oldid=36549 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Familia: Ellobiidae
Genus: Zospeum

Name

Zospeum tholussum Weigand sp. n.Wikispecies linkZooBank linkPensoft Profile

Material examined

A single living specimen was collected on 31.07.2010 (leg. Jana Bedek), which is designated as the holotype specimen (BOLD-ID BARCA210-13) (Fig. 1, life image; Fig. 2, upper row). Eight shells comprise paratype specimens, of which one was partially broken and used to investigate the form of the columellar fold. Shells were collected on several days during the caving expedition from 29.07. - 03.08.2010 (Fig. 2). All investigated specimens are deposited in the Forschungsinstitut und Naturmuseum Senckenberg, Frankfurt am Main, Germany (museum voucher SMF 341633).

Diagnosis

The general shape of Zospeum tholussum sp. n. resembles larger specimens of Zospeum amoenum (Frauenfeld, 1856) from which it can be best delineated by the dome-like structured 2nd whorl (Fig. 2), the weak but present columellar fold (Fig. 3) and by means of their DNA barcodes (11.7 %–12.1 % genetic p-distance between both species).

Description

The eight conchologically investigated specimens (the holotype and seven paratypes) demonstrate moderate shell variability (Table 1). Shells are generally smooth, very thin and fragile. Fresh shells or those of living specimens are translucent, older ones adopt a milky white color. The number of whorls are 5–6, SH ranges from 1.41–1.81 mm, SW from 0.93–1.12 mm, AH from 0.44–0.54 mm and AW from 0.38–0.46 mm. The ratio of SH/SW is between 1.34–1.62 and AH/AW between 1.05–1.30. The 2nd whorl is remarkably enlarged possessing a height of 2/3–5/6 the height of the 3rd + 4th whorl. The columellar is only weakly developed (Fig. 3) and no teeth (i.e. parietalis, palatalis or columellaris) are present. The DNA barcode of the holotype, when compared with other DNA barcodes of Zospeum species deposited in BOLD, shows its lowest interspecific genetic distance to Zospeum pretneri Bole, 1960 (5.6 %; BOLD-ID: BARCA120-10). This result is well above the barcoding gap of 3.2 % for Carychiidae, which is suitable to separate between-species (> 3.2 %, interspecific) and within-species genetic diversity (< 3.2 %, intraspecific) in Zospeum (Weigand et al. 2011[1], 2013[2]).

Table 1. Conchological measurements for Zospeum tholussum. Seven paratypes (Ind. 1–7) and the holotype specimen (Ind. 8) were measured. All measurements are given in millimeter. Additionally, ratios of shell height / shell width (sh/sw) and aperture height / aperture width (ah/aw) were calculated. The range of variability is given for all parameters.
Ind. sh/sw ah/aw shell height shell width aperture height aperture width
1 1.60 1.16 1.49 0.93 0.44 0.38
2 1.42 1.30 1.54 1.08 0.52 0.40
3 1.46 1.16 1.41 0.97 0.46 0.39
4 1.34 1.05 1.44 1.07 0.47 0.44
5 1.50 1.31 1.63 1.09 0.54 0.41
6 1.53 1.23 1.61 1.05 0.51 0.41
7 1.62 1.15 1.81 1.12 0.53 0.46
8 (holotype) 1.48 1.12 1.47 0.99 0.44 0.39
range 1.34–1.62 1.05–1.30 1.41–1.81 0.93–1.12 0.44–0.54 0.38–0.46

Habitat

The single living specimen was found in an unnamed large chamber at 980 m depth (85 m long, 70 m wide) with lots of stones, rocks and sand (Fig. 1, right site). A temporal small stream of running water was present close to the collecting site. Air temperature was between 3.3–3.5 °C (depending on the measurement device), water temperature 5.1 °C and air humidity 100 %. Shells were observed beginning from 800 m depth till the bottom of the cave. Shells were generally found on layers of mud (Fig. 1, left site). The first 200 m of the entrance passage of Lukina Jama are permanently covered by varying levels of snow and ice.

Etymology

The Latin word tholus means dome or cupola and refers to the remarkable dome-like shape of the 2nd whorl.

Remarks

In addition to the newly described Zospeum tholussum, a second Zospeum species is present in the Lukina Jama–Trojama cave system (Fig. 4C). This species can be differentiated from Zospeum tholussum by the presence of a tooth, its general shell shape, more prominent columellar fold and absence of the characteristic dome-like structured 2nd whorl. Because only shells were found, no DNA barcodes are available for this species. So far, Zospeum tholussum is only known from the Lukina Jama–Trojama cave system. However, this cave system is situated in the distribution range of the morphologically related species Zospeum amoenum (Frauenfeld, 1856), which inhabits caves of the West Balkan of North Slovenia, West Croatia, Bosnia and Herzegovina and South to Montenegro (Bole 1974[3]). Absolon (1916)[4] named but did not describe another morphologically related species - Zospeum troglobalcanicum. Since Weigand et al. (2013)[2] revealed that Zospeum spp. with an inferred large distribution range are particularly prone to host additional, morphologically unrecognized species, some of the distribution records for Zospeum amoenum may very well refer to Zospeum tholussum. Moreover, the intraspecific genetic and conchological variability of the new species should be investigated in greater detail, thus to judge about the taxonomic information content of the diagnostic characters applied within this description.
The preliminary information on the habitat of Zospeum tholussum is in congruence with previous findings for Zospeum. Interestingly, the grazing-labyrinth-like structure, in which most of the shells were embedded (Fig. 1, left site), has been already observed during caving expeditions in Northern Spain (Jochum et al. 2012[5]). Finally, the presence of a temporal stream at the collecting site of the living specimen further supports a passive dispersal scenario as suggested by Weigand et al. (2013)[2].

Original Description

  • Weigand, A; 2013: New Zospeum species (Gastropoda, Ellobioidea, Carychiidae) from 980 m depth in the Lukina Jama – Trojama cave system (Velebit Mts., Croatia) Subterranean Biology, 11: 45-53. doi

Other References

  1. Weigand A, Jochum A, Pfenninger M, Steinke D, Klussmann-Kolb A (2011) A new approach to an old conundrum - DNA barcoding sheds new light on phenotypic plasticity and morphological stasis in microsnails (Gastropoda, Pulmonata, Carychiidae). Molecular Ecology Resources 11(2): 255-265. doi: 10.1111/j.1755-0998.2010.02937.x
  2. 2.0 2.1 2.2 Weigand A, Jochum A, Slapnik R, Schnitzler J, Zarza E, Klussmann-Kolb A (2013) Evolution of microgastropods (Ellobioidea, Carychiidae): integrating taxonomic, phylogenetic and evolutionary hypotheses. BMC Evolutionary Biology 13(1): 18. doi: 10.1186/1471-2148-13-18
  3. Bole J (1974) Rod Zospeum Bourguignat 1856 (Gastropoda, Ellobiidae) v Jugoslaviji. Slovenska Akademija Znanosti in Umetnosti. Razprave 17(5): 1-43.
  4. Absolon K (1916) Z výzkumnýh cest po kraseh balkánu. Zlatá Praha 33.
  5. Jochum A, Weigand A, Slapnik R, Valentinčič J, Prieto C (2012) The microscopic ellobioid, Zospeum Bourguignat, 1856 (Pulmonata, Ellobioidea, Carychiidae) makes a big debut in Basque Country and the province of Burgos (Spain). MalaCo 8: 400-403.

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