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Morphometry of the shell in Scaphopoda (Mollusca): a tool for the discrimination of taxa

Published online by Cambridge University Press:  29 December 2020

Leonardo Santos de Souza Open the ORCID record for Leonardo Santos de Souza [Opens in a new window]  and
Carlos Henrique Soares Caetano
Leonardo Santos de Souza*
Affiliation:
Departamento de Invertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
Carlos Henrique Soares Caetano
Affiliation:
Laboratório de Zoologia de Invertebrados Marinhos, Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
*
Author for correspondence: Leonardo Santos de Souza, E-mail: leosouza2301@gmail.com
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Abstract

The alpha taxonomy of scaphopods is based mainly on the shell morphology, as it is for most molluscs. In the last three decades, the employment of morphometric variables of the shell in combination with statistics has considerably increased to aid species discrimination, but this has not been used above species level. In this study, a traditional morphometric approach was used to distinguish congeners, genera and families within the orders Dentallida and Gadilida. We studied 28 species of scaphopods from Brazil, belonging to 12 genera and five families. Twelve morphometric variables were measured, and a correlation test was done to select a set of variables without correlation as input data to perform a discriminant analysis. In the analysis of congeners, the discrimination power was high in both orders. Among the genera studied, the robustness of the analysis was drastically reduced in Dentaliida, while Gadilida maintained a high percentage of correct classifications. At the family level, both orders presented high percentages of correct classification, but the imbalance of cases for each taxon masks an inconsistent result. Based on our results, the morphometric approach was a useful tool to discriminate congeneric species of both orders and to discriminate the genera of Gadilida.

Keywords

DentaliidaGadilidashell morphologytaxonomytraditional morphometrics
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 8 , December 2020 , pp. 1271 - 1282
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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References

Absalão, RS and de Paula, TS (2004) Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the South-western Atlantic Ocean: comparing the discrimination power of primary and secondary descriptors. Zootaxa 706, 1–12.CrossRefGoogle Scholar
Absalão, RS and Santos, FN (2004) Recent deep-sea species of Benthonellania Lozouet, 1990 (Gastropoda, Rissoidea) from the South-Western Atlantic with description of two new species utilizing a shell morphometric multivariate. Journal of Conchology 38, 329–340.Google Scholar
Absalão, RS, Silva, PHA and de Paula, TS (2005) Shell morphometrics in four species of Gadilidae (Mollusca, Scaphopoda) in southwestern Atlantic Ocean, Brazil. Revista Brasileira de Zoologia 22, 175–179.CrossRefGoogle Scholar
Benaim, NP and Absalão, RS (2011) Discriminating among similar deep-sea Yoldiella (Pelecypoda: Protobranchia) species with a morphometric approach. Journal of the Marine Biological Association of the United Kingdom 91, 1665–1672.CrossRefGoogle Scholar
Branch, GM and Marsh, AC (1978) Tenacity and shell shape in six Patella species: adaptative features. Journal of Experimental Marine Biology and Ecology 3, 111–130.CrossRefGoogle Scholar
Burridge, AK, Goetze, E, Raes, N, Huisman, J and Peijnenburg, KTCA (2015) Global biogeography and evolution of Cuvierina pteropods. BMC Evolutionary Biology 15, 39.CrossRefGoogle ScholarPubMed
Caetano, CHS and Absalão, RS (2005) A new species of the genus Polyschides Pilsbry & Sharp, 1898 (Mollusca, Scaphopoda, Gadilidae) from Brazilian waters. Zootaxa 871, 1–10.CrossRefGoogle Scholar
Caetano, CHS and Santos, FN (2010) Mollusca, Scaphopoda, Gadilidae, Striocadulus magdalensis Gracia and Ardila, 2009: first record of the genus and species from Brazil. Check List 6, 687–689.CrossRefGoogle Scholar
Caetano, CHS, Scarabino, V and Absalão, RS (2006) Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13° to 21°S) with descriptions of two new species of the genus Cadulus Philippi, 1844. Zootaxa 1267, 1–47.CrossRefGoogle Scholar
Caetano, CHS, Scarabino, V and Absalão, RS (2010) Brazilian species of Gadila (Mollusca: Scaphopoda: Gadilidae): rediscovery of Gadila elongata comb. nov. and shell morphometrics. Zoologia 27, 305–308.CrossRefGoogle Scholar
Chiu, Y, Chen, H, Lee, S and Chen, CA (2002) Morphometric analysis of shell and operculum variations in the viviparid snail, Cipangopaludina chinensis (Mollusca: Gastropoda), in Taiwan. Zoological Studies 41, 321–331.Google Scholar
Emerson, WK (1962) A classification of the scaphopod mollusk. Journal of Paleontology 36, 461–482.Google Scholar
Kilgour, BW, Lynn, DH and Mackie, GL (1990) Use of shell morphometric data to aid classification of Pisidium (Bivalvia: Sphaeridae). American Malacological Bulletin 7, 109–116.Google Scholar
Kristensen, TK and Christensen, AG (1989) Bulinus africanus-group species in West Africa differentiated by morphometric analysis (Gastropoda, Planorbidae). Journal of Molluscan Studies 55, 103–110.CrossRefGoogle Scholar
Lacerda, LEM, Miyahira, IC and Santos, SB (2011) Shell morphology of the freshwater snail Gundlachia ticaga (Gastropoda: Ancylidae) from four sites in Ilha Grande, southeastern Brazil. Zoologia (Curitiba) 28, 334–342.CrossRefGoogle Scholar
Lam, PKS and Calow, P (1988) Differences in the shell shape of Lymnaea peregra (Müller) (Gastropoda: Pulmonata) from lotic and lenthic habitats: environmental or genetic variance? Journal of Molluscan Studies 54, 197–207.CrossRefGoogle Scholar
Lamprell, KL and Healy, JM (1998) A revision of the Scaphopoda from Australian waters (Mollusca). Records of the Australian Museum Supplement 24, 1–189.CrossRefGoogle Scholar
Matos, AS, Matthews-Cascon, H and Chaparro, OR (2020) Morphometric analysis of the shell of the intertidal gastropod Echinolittorina lineolata (d'Orbigny, 1840) at different latitudes along the Brazilian coast. Journal of the Marine Biological Association of the United Kingdom 100, 725–731. https://doi.org/10.1017/S0025315420000624CrossRefGoogle Scholar
McMahon, RT and Whitehead, BE (1987) Environmental induction of shell morphometric variation in the European stream limpet, Ancylus fluviatilis (Müller) (Pulmonata: Basommatophora). American Malacological Bulletin 5, 105–124.Google Scholar
Miranda, MJ and Cuezzo, MG (2014) Taxonomic revision of the Bostryx stelzneri species complex, with description of a new species (Gastropoda: Orthalicoidea: Bulimulidae). American Malacological Bulletin 32, 74–93.CrossRefGoogle Scholar
Palmer, CP (1974) A supraspecific classification of the Scaphopoda Mollusca. The Veliger 17, 115–123.Google Scholar
Preston, SJ and Roberts, D (2007) Variation in shell morphology of Calliostoma zizyphinum (Gastropoda: Trochidae). Journal of Molluscan Studies 73, 101–104.CrossRefGoogle Scholar
Reynolds, PD (1997) The phylogeny and classification of Scaphopoda (Mollusca): an assessment of current resolution and cladistics reanalysis. Zoologica Scripta 26, 13–21.CrossRefGoogle Scholar
Reynolds, PD and Okusu, A (1999) Phylogenetic relationships among families of the Scaphopoda (Mollusca). Zoological Journal of the Linnean Society 126, 131–154.CrossRefGoogle Scholar
Reynolds, PD and Steiner, G (2008) Scaphopoda. In Ponder, W and Lindberg, DL (eds), Phylogeny and Evolution of the Mollusca. Berkeley, CA: University of California Press, pp. 143–159.Google Scholar
Rolán, E (1991) El género Amphitalamus Carpenter, 1864 em Cuba (Mollusca, Gastropoda, Rissoidae), com la descripción de tres nuevas espécies. Iberus 10, 131–141.Google Scholar
Romesburg, HC (1984) Cluster Analysis for Researchers. Belmont, CA: Lifetime Learning Publications.Google Scholar
Scarabino, V (1995) Scaphopoda of the tropical pacific and Indian waters, with descriptions of 3 new genera and 42 new species. In Bouchet, P (ed.), Résultats des Campagnes Musorstom, v. 14. Paris: Mémoires du Muséum National d'Histoire Naturelle 167, pp. 189–379.Google Scholar
Scarabino, V and Caetano, CHS (2008) On the genus Heteroschismoides Ludbrook, 1960 (Scaphopoda: Gadilida, Heteroschismoidinae), with description of two new species. The Nautilus 121, 171–177.Google Scholar
Scarabino, V, Caetano, CHS and Carranza, A (2011) Three new species of the deep-water genus Bathycadulus (Mollusca, Scaphopoda, Gadilidae). Zootaxa 3096, 59–63.CrossRefGoogle Scholar
Shimek, RL (1989) Shells morphometrics and systematics: a review of the slender, shallow-water Cadulus of the Northeastern Pacific (Scaphopoda: Gadilida). The Veliger 32, 233–246.Google Scholar
Shimek, RL (1997) A new species of eastern Pacific Fissidentalium (Mollusca: Scaphopoda) with a symbiotic sea anemone. The Veliger 40, 178–191.Google Scholar
Shimek, RL and Moreno, G (1996) A new species of Eastern Pacific Fissidentalium (Mollusca: Scaphopoda). The Veliger 39, 71–82.Google Scholar
Souza, LS and Caetano, CHS (2013) A commented list of Scaphopoda (Mollusca) found along the Brazilian coast, with two new synonymies in the genus Gadila Gray, 1847. Biota Neotropica 13, 227–235.CrossRefGoogle Scholar
Steiner, G (1992) Phylogeny and classification of Scaphopoda. Journal of Molluscan Studies 58, 385–400.CrossRefGoogle Scholar
Steiner, G (1998 a) Phylogeny of Scaphopoda (Mollusca) in the light of new anatomical data on the Gadilinidae and some Problematica, and a reply to Reynolds. Zoologica Scripta 27, 73–82.CrossRefGoogle Scholar
Steiner, G (1998 b) Order Gadilida. In Beesley, PL, Ross, GJB and Wells, A (eds), Mollusca: The Southern Synthesis. Fauna of Australia, v. 5, Part. A. Melbourne: CSIRO Publishing, pp. 443–450.Google Scholar
Steiner, G and Dreyer, H (2003) Molecular phylogeny of Scaphopoda (Mollusca) inferred from 18S rDNA sequences: support for a Scaphopoda–Cephalopoda clade. Zoologica Scripta 32, 343–356.CrossRefGoogle Scholar
Viegas, DCP, Benaim, NP and Absalão, RS (2014) Description of four new species of Ledella Verrill and Bush, 1897 (Pelecypoda: Nuculanidae) off the coast of Brazil, using a morphometric approach. American Malacological Bulletin 32, 183–197.CrossRefGoogle Scholar
Vilela, PMS, Souza, LS and Caetano, CHS (2019) Larval and early post-larval shell of three deep-sea Scaphopoda (Mollusca) from the southwest Atlantic. Molluscan Research 39, 35–43.CrossRefGoogle Scholar
Ward, PI, Goater, CP and Mikos, M (1997) Shell variation in sympatric freshwater Lymnaea peregra and L. ovata (Gastropoda: Lymnaeidae). Biological Journal of the Linnean Society 61, 139–149.Google Scholar
Zelditch, ML, Swiderski, DL, Sheets, HD and Fink, WL (2004) Geometric Morphometrics for Biologists. San Diego, CA: Elsevier Academic Press.Google Scholar
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