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Reassignment of Three Species and One Subspecies of Philippine Land Snails to the Genus Acmella Blanford, 1869 (Gastropoda: Assimineidae)

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Reassignment of Three Species and One Subspecies of Philippine Land Snails to the Genus Acmella Blanford, 1869 (Gastropoda: Assimineidae) Tropical Natural History 20(3): 223–227, December 2020 2020 by Chulalongkorn University Reassignment of Three Species and One Subspecies of Philippine Land Snails to the Genus Acmella Blanford, 1869 (Gastropoda: Assimineidae) KURT AUFFENBERG1 AND BARNA PÁLL-GERGELY2* 1Florida Museum of Natural History, University of Florida, Gainesville, 32611, USA 2Plant Protection Institute, Centre for Agricultural Research, Herman Ottó Street 15, Budapest, H-1022, HUNGARY * Corresponding author. Barna Páll-Gergely ([email protected]) Received: 30 May 2020; Accepted: 22 June 2020 ABSTRACT.– Three species of non-marine snails (Georissa subglabrata Möllendorff, 1887, G. regularis Quadras & Möllendorff, 1895, and G. turritella Möllendorff, 1893) and one subspecies (G. subglabrata cebuensis Möllendorff, 1887) from the Philippines are reassigned from Georissa Blanford 1864 (Hydrocenidae Troschel, 1857) to Acmella Blanford, 1869 (Assimineidae H. Adams & A. Adams, 1856) based on shell characters. KEY WORDS: Philippines, Hydrocenidae, Assimineidae, Georissa, Acmella INTRODUCTION despite that their shell characters were very unlike those of Georissa (see Discussion). The land snail fauna of the Republic of the Möllendorff (1898: 208) assigned these Philippines is immense with approximately species to “Formenkreis der Georissa 2,000 species and subspecies described subglabrata Mldff.” without definition. (unpublished information, based on species Georissa subglabrata cebuensis was omitted recorded in the literature). Very few have without discussion. Zilch (1973) retained been reviewed in recent times. Eleven these species in Georissa with no mention species of Georissa W.T. Blanford 1864 of Möllendorff’s Formenkreis. (type species: Hydrocena pyxis Benson, The first author conducted a cursory 1856, by original designation, Hydrocenidae review of Philippine Georissa during Troschel, 1857) have been recorded from research resulting in the description of G. the Philippines, described by Möllendorff cavini Auffenberg, 1998. It was determined (1887a, 1893, 1898), Quadras and Möllendorff by the presence of shell characters not found (1895, 1896), and Auffenberg (1998). All in Georissa that the species discussed below are considered obligatory calciphiles with were improperly assigned to the genus limited geographic distributions, except for (Auffenberg, 1998: 111). We here formally G. denselirata Möllendorff, 1894 and G. transfer these three species and one subglabrata Möllendorff, 1887a, both being subspecies to the genus Acmella Blanford, reported from several Philippine islands 1869 (Assimineidae H. Adams & A. (Möllendorff 1898). Adams, 1856), thereby removing them from Georissa regularis Quadras & the subclass Neritimorpha and assigning Möllendorff, 1895, G. subglabrata, G. them to the subclass Caenogastropoda subglabrata cebuensis Möllendorff, 1887 (Bouchet et al. 2017), and reducing the (1887b), and G. turritella Möllendorff, 1893 number of Georissa species known to occur were described in the Philippine Hydrocenidae in the Philippines to eight. 224 TROPICAL NATURAL HISTORY 20(3), DECEMBER 2020 MATERIAL AND METHODS questionable. A diagnosis of Acmella was recently published by Vermeulen et al. Determination of the number of shell (2015), although referring only to species whorls (precision to 0.25 whorl) follows inhabiting Sabah (Malaysia, Borneo): "Land Kerney & Cameron (1979: 13). Approximately snails. Spire without constriction. Umbilicus 10 photographs of each view were taken often with a slight periomphalic thread with a Nikon camera in the Senckenberg starting on the columellar side of the Museum, and merged into a single image peristome, close to the columellar corner, with Photoshop. and spiralling (steeply) upwards. Peristome Locality data presented with the specimen usually not or hardly thickened (except examined data are cited as verbatim from sometimes in gerontic shells)." the specimen labels. Acmella regularis (Quadras & Möllendorff, Abbreviations: 1895) new combination NHM – The Natural History Museum, London, Fig. 1A UK Georissa regularis Quadras & Möllendorff, SMF – Senckenberg Forschungsinstitut und 1895: 149. Naturmuseum, Frankfurt am Main, Germany Georissa regularis — Möllendorff, 1898: 208. UMCZ – University of Cambridge Museum Georissa regularis — Zilch, 1973: 266, plate of Zoology, Cambridge, UK 13, fig. 20. Georissa regularis — Lehmann, 2018: figs SYSTEMATICS 16.1, k–l. Material examined: Philippinen, Busuanga, Genus Acmella W.T. Blanford, 1869 Calamianes, coll. Möllendorff ex coll. Acicula (Acmella) W.T. Blanford, 1869: 177 Quadras, SMF 228045 (lectotype); Same – 178, fig. 2. data, SMF 228046 (23 paralectotypes). Type species. Cyclostoma tersum Benson, 1853, by original designation. Acmella subglabrata (Möllendorff, 1887) Remarks. We hoped to examine the type new combination specimen (or specimens) of Cyclostoma Fig. 1B tersum Benson, 1853, but it seems to be lost. Georissa subglabrata Möllendorff, 1887a: 96, Blanford (1869) wrote that the "original plate 4, fig. 5. specimen was probably weathered", and the Georissa subglabrata — Möllendorff, 1893: 145. specimens he examined were fresh, and Georissa subglabrata — Möllendorff, 1898: 208. were received from Godwin-Austen. Georissa subglabrata — Zilch, 1973: 266–267, Blanford (1869) identified them as Acicula plate 13, fig. 18. (Acmella) tersa "with no hesitation", and Material examined. Phil. (Luzon): Montalban published illustrations (Blanford 1869: 12: b. Manila, coll. O. Boettger ex coll. Möllendorff plate 16, fig. 2). We could use those 1887, SMF 228021 (lectotype); Same data, specimens as reference to C. tersum, but the SMF 228022 (5 paralectotypes); Same specimens examined by Blanford could not locality, coll. Möllendorff, SMF 228023 (12 be found in the NHM or the UMZC paralectotypes). (Richard Preece pers. comm., 2017 June). Therefore, the status of this genus is AUFFENBERG AND PÁLL-GERGELY — THE GENUS ACMELLA OF THE PHILIPPINES 225 FIGURE 1. A. Acmella regularis (Quadras & Möllendorff, 1895) (SMF 228045, lectotype); B. Acmella turritella (Möllendorff, 1893) (SMF 228016, lectotype); C. Acmella subglabrata (Möllendorff, 1887) (SMF 228021, lectotype); D. Acmella subglabrata cebuensis (Möllendorff, 1887) (SMF 228040, lectotype). Note that the slight greenish colouration of the apertures is due to the green plasticine clay in which the shells were fixed for photography. Scale bars = 1.0 mm. All photos: B. Páll-Gergely, courtesy R. Janssen. Acmella subglabrata cebuensis (Möllendorff, Georissa turritella — Zilch, 1973: 266–267, 1887) new combination plate 13, fig. 21. Fig. 1C Material examined. Philippinen, Monte Georissa subglabrata var. cebuensis Möllendorff, Bontoc, Leyte, coll. O. Boettger ex coll. 1887b: 257. Möllendorff, SMF 228016 (lectotype); Georissa subglabrata cebuensis — Zilch, 1973: Same data, SMF 228017 (2 paralectotypes); 267, plate 13, fig. 19. Same locality, coll. Möllendorff, SMF Material examined. Philippinen: Cebu 228018 (6 paralectotypes). (höhere Berge), coll. Möllendorff, SMF 228040 (lectotype); Same data, SMF DISCUSSION 228041 (6 paralectotypes). Möllendorff (1898: 203) lists four Acmella turritella (Möllendorff, 1893) new species and one subspecies from the combination Philippines as Omphalotropis Pfeiffer, Fig. 1D 1851, section Acmella and as indicated by Georissa turritella Möllendorff, 1893: 145, the photographs of the lectotypes given by plate 5, figs 14, 14a–b. Zilch (1967), the assignments to Acmella Georissa turritella — Möllendorff, 1898: 208. seem correct. Möllendorff (1898: 207–208) 226 TROPICAL NATURAL HISTORY 20(3), DECEMBER 2020 records seven species of Georissa from the ACKNOWLEDGEMENTS Philippines and photographs of the lectotypes (Zilch 1973) show that those assignments We are grateful to Sigrid Hof and Ronald are correct as well. Since Möllendorff had Janssen (SMF) for granting access to the adequate knowledge of the two genera, we collections under their care. We thank the do not understand why the four taxa Biodiversity Heritage Library (https://www. discussed here were originally assigned to biodiversitylibrary.org) and Jens Lehmann, Georissa. Furthermore, we do not know University of Bremen, Germany for why these taxa were not transferred from literature. This study was supported by the Acmella to Georissa by Zilch (1973). Premium Post Doctorate Research Program, The Acmella species discussed here are the Hungarian Research Fund (OTKA FK generally characterized by having a very 135262) and the Bolyai Research Scholarship small (ca. 1.5–2.0 mm), narrowly conic of the Hungarian Academy of Sciences shell, consisting of 4.5–5.0 convex whorls (PGB). The fieldwork on Panay Island, with a deep suture, a sub-ovate aperture Philippines that initiated this study was funded with a thin, simple peristome, and a narrow by the Thomas L. McGinty Foundation Fund, umbilicus. The shell is sculptured with fine University of Florida Foundation (KA). radial and spiral lines resulting in a reticulated pattern. This corresponds with LITERATURE CITED the current understanding of Acmella (family Assimineidae) (see Vermeulen et al. Auffenberg, K. 1998. A new species of land snail of 2015). In contrast, the genus Georissa the genus Georissa (Gastropoda: Hydrocenidae) (family Hydrocenidae) is characterized by a from the Philippine Islands. The Nautilus, 112(4): small turbiniform shell consisting of 3.5–4.5 109-112. https://www.biodiversitylibrary.org/page/ convex whorls, slightly thickened peristome, 8272635 Benson, W.H. 1853. Additional character
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