Angustopila psammion Pall-Gergely, Anker & Vermeulen 2022, n. sp.
Creators
- 1. Plant Protection Institute, Centre for Agricultural Research, ELKH, Herman Ottó út 15, 1022 Budapest, Hungary pall-gergely. barna @ atk. hu, pallgergely 2 @ gmail. com
- 2. Naturhistorisches Museum der Burgergemeinde Bern, 3005 Bern, Switzerland Institute of Ecology and Evolution, University of Bern, 3012 Bern, Switzerland Senckenberg Forschungsinstitut und Naturmuseum, 60325 Frankfurt am Main, Germany
- 3. JK Art and Science, Lauwerbes 8, 2318 AT Leiden, The Netherlands jk. artandscience @ gmail. com
- 4. Adria sétány 10 G 2 / 5, 1148 Budapest, Hungary hunand @ freemail. hu
- 5. Section of Mollusks, Carnegie Museum of Natural History, Pittsburgh, PA 15213, USA anothersnail @ hotmail. com
- 6. Lithosphere Fluid Research Laboratory, Institute of Geography and Earth Sciences, Eötvös University, Pázmány p. sétány 1 / C, 1117 Budapest, Hungary abel. szabo @ ttk. elte. hu
- 7. Institute for Soil Sciences and Agricultural Chemistry, Centre for Agricultural Research, ELKH, Herman Ottó út 15, 1022 Budapest, Hungary
- 8. Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands & Institute for Biology Leiden, Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands & Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
Description
Angustopila psammion Páll-Gergely, Anker & Vermeulen, n. sp.
urn:lsid:zoobank.org:act:EAD52AC1-985A-48E7-8AF9-4C2629C416BF
Type material: Vietnam, Quang Ninh Province, Ha Long Bay, Cap La Cave, 20°51.793’N, 107°13.541’E, soil deposit fallen through roof in pristine cave, vegetation outside cave tall and woody, leg. J.J. Vermeulen & K. Anker, 07 March 2018, holotype (HNHM 104886); CUMZ 7436 / 2 paratypes; SMF 365052 / 2 paratypes; VNMN / 2 paratypes; ZRC. MOL.23218/ 2 paratypes, jjV 17633/ 409 paratypes.
Diagnosis: An Angustopila species with a depressed-globular shell with dome-shaped spire, thick spiral striae, kidney-shaped aperture with single parietal denticle not reaching parietal callus.
Description: Shell tiny, off-white, depressed-globular form with domed spire; body whorl widest in standard apertural view; protoconch with 1.5 whorls and a minute and very uneven pattern of polygonal, rather sharp-crested ridges locally forming minute, conical peaks where ridges split (the structure also reminiscent of cross-sectional trabecular bone), no spiral striation discernible; teleoconch ornamented by some weak radial growth lines and much stronger, ropelike, equidistantly-arranged spiral striae (ca. 14–15 on body whorl from standard apertural view); the 3.25–3.5 whorls are separated by a deep suture; whorls slightly shouldered; aperture oblique to shell axis in lateral view; umbilicus relatively wide, less than one third of shell width; aperture kidney-shaped with strongly concave parietal side; sinulus wide, weakly separated due to weak parietal tooth; peristome expanded, not reflected; parietal callus strongly protruding, but in line with curvature of penultimate whorl and beyond aperture edge (profile) in lateral view (fig. 3C), detached from penultimate whorl; parietal tooth weak, low, short, rounded, does not reach peristome.
Soft anatomy unknown.
Measurements (in mm): SW = 0.6–0.68, SH = 0.46–0.57 (n = 24).
Differential diagnosis: Angustopila pallgergelyi Dumrongrojwattana, Chuenit & Wongkamhaeng, 2021 is similar in shell and aperture shape, but is larger, has a prominent palatal tooth (absent in Angustopila psammion n. sp.)and a stronger parietal tooth. Angustopila coprologos n. sp. is slightly larger, has a rough shell surface, and has an additional subcolumellar tooth and two palatal teeth.
Etymology: The specific epithet (ΨαμμϯΟν) means a grain of sand in Greek and is used as a noun in apposition.
Distribution: This new species is known only from the type locality, Cap La Cave, Ha Long Bay, Quang Ninh Province, Vietnam.
Habitat: Angustopila psammion n. sp. was found in large numbers in small sediment deposits along the walls of a dry cave (Cap La Cave), in complete darkness. We assume that the sediment had fallen in through crevices in the rock, because it contains a species-rich assemblage of bleached, opaque shells of surface-dwelling terrestrial gastropods. Shells of Angustopila psammion n. sp., however, look fresh and are probably autochthonous.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- CUMZ , HNHM , SMF , VNMN , ZRC, MOL
- Event date
- 2018-03-07
- Family
- Gastrocoptidae
- Genus
- Angustopila
- Kingdom
- Animalia
- Material sample ID
- CUMZ 7436 , HNHM 104886 , SMF 365052
- Order
- Stylommatophora
- Phylum
- Mollusca
- Scientific name authorship
- Pall-Gergely, Anker & Vermeulen
- Species
- psammion
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Type status
- holotype , paratype
- Verbatim event date
- 2018-03-07
- Taxonomic concept label
- Angustopila psammion Páll-Gergely, Vermeulen & Anker, 2022
References
- Dumrongrojwattana, P., Chuenit, S. & Wongkamhaeng, K. (2021) A new species of the world's smallest cave snail of the genus Angustopila Jochum, Slapnik & Pall- Gergely in Jochum, et al., 2014 (Gastropoda: Hypselostomatidae) from eastern Thailand. Raffles Bulletin of Zoology, 69, 102 - 108.