Uncovering the shell game with barcodes: diversity of meiofaunal Caecidae snails (Truncatelloidea, Caenogastropoda) from Central America Author Egger, Christina SNSB-Zoologische Staatssammlung Muenchen, Muenchhausenstr. 21, 81247 Munich, Germany & CCMAR, Campus de Gambelas, Universidade do Algarve, 8005 - 139 Faro, Portugal https://orcid.org/0000-0002-6678-2549 christinaegger@gmx.de Author Neusser, Timea P. LMU Munich, Biocenter, Dept. II, Grosshaderner Str. 2, 82152 Planegg-Martinsried, Germany Author Norenburg, Jon Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA Author Leasi, Francesca Department of Biology, Geology and Environmental Science. University of Tennessee at Chattanooga. 615 McCallie Ave. Chattanooga, TN 37403, USA Author Buge, Barbara Museum national d'Histoire naturelle, 55 Rue Buffon, 75231 Paris, France Author Vannozzi, Angelo Independent researcher, Via M. L. Longo 8, Rome, Italy Author Cunha, Regina L. CCMAR, Campus de Gambelas, Universidade do Algarve, 8005 - 139 Faro, Portugal Author Cox, Cymon J. CCMAR, Campus de Gambelas, Universidade do Algarve, 8005 - 139 Faro, Portugal Author Joerger, Katharina M. SNSB-Zoologische Staatssammlung Muenchen, Muenchhausenstr. 21, 81247 Munich, Germany text ZooKeys 2020 968 1 42 http://dx.doi.org/10.3897/zookeys.968.52986 journal article http://dx.doi.org/10.3897/zookeys.968.52986 1313-2970-968-1 4296306E51B94873AB6F4B475194CA98 0ABFD46F13B65EEE97867BC2166A59E3 Caecum donmoorei Mitchell-Tapping, 1979 Caecum donmoorei Mitchell-Tapping, 1979: 104, 105, figs 21, 22, 31, 32 Type locality: In 5 m of water in Sprat Baz, Water Island, USVI. Material examined. Panama • 1, juv.; Bocas del Toro; 9.2141 , -81.9318 ; depth 8.5 m; 5 Jun 2010; USNM BRS 2010 exped.; Stat. BRS108; DNA voucher; GenBank: MT704265, MT731691; USNM 1618857. • 1; same collection data as for preceding; DNA voucher; GenBank: MT704266, MT731692; USNM 1618858. Belize • 1 (Fig. 7G ); Carrie Bow Cay; 16.8015 , -88.0790 ; depth 10 m; 14 Jan 2010; USNM Belize2010 exped.; Stat. CBC1b; DNA voucher; GenBank: MT704274, MT731703; USNM 1618844. Shell morphology. Shell opaque white and solid. Size large> 2.0 mm. Tube moderately curved and curvature stronger towards aperture (Fig. 7G ). Septum blistered with pointed, sharp mucro (Fig. 7G ). Aperture surrounded by three narrow thick rings. Sculpture consists of 25 distinct squarish ribs with wide, deep interspaces. No microsculpture available. Remarks. The collected specimen USNM 1618844 closely resembles the description of C. donmoorei from the Virgin Islands ( Mitchell-Tapping 1979 ), however microsculptural data for comparison is missing. Our molecular data suggests the species identity among specimens with less separated, strongly flattened rings and almost vanishing interspaces (e.g., in juvenile USNM 1618857). The same has been observed for the confusingly similar species C. quadratum , Carpenter (1855-1857 : 322, pl. 34, fig. 370). It can also exhibit a considerable variety of shell morphologies ( Lightfoot 1993a ), however it origins from the Eastern Pacific. And a second highly similar species, C. regulare (see above) is clearly distinguished herein based on molecular data.