Meioceras nitidum
Creators
Description
MEIOCERAS NITIDUM (STIMPSON, 1851)
FIG. 7A–C
Caecum nitidum Stimpson, 1851: 112, (original type material destroyed), Florida.
Caecum (Meioceras) nitidum — Dall, 1892: 302; Morse, 1919: 76, pl. V, fig. 6; Moore, 1972: 892, fig. 11; Abbott, 1974: 94, fig. 895; Keller, 1981: 71, fig. 22; Vokes & Vokes, 1983: 16; Mello & Maestrati, 1986: 161, fig. 16; Lightfoot, 1992: 29, fig. 33; Rios, 1994: 58, pl. 19, fig. 217; Bandel, 1996: 63, pl. 5, fig. 1–6; Gomes & Absalão, 1996: 524, fig. 14; Oliveira & Almeida, 1999: 3, fig. 13; Daccarett and Bossio 2011: 73, fig. 244.
Meioceras nitidum (Stimpson, 1851) — Gomes, 1999: 27; Redfern, 2013: 71, fig. 211A–E; Lester, 2017: 27, fig 9; Lamy & Pointier, 2017: 203, fig. 12, Egger et al. 2020: 14, fig. 5A–D; Costa et al. 2021: 84, fig. 2I.
Caecum rotundum de Folin, 1868: 49, pl. 5, fig. 2 — Lester, 2017: 27.
Meioceras bitumidum de Folin, 1869a: 25, fig. 4 — Kisch, 1959: 39; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 19, fig. 14; Lester, 2017: 27.
Meioceras carpenteri de Folin, 1869a: 24, fig. 3 — Kisch, 1959: 39; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 20, fig. 15; Lester, 2017: 27.
Meioceras coxi de Folin, 1869a: 29, fig.9 — Kisch, 1959: 39; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 20, fig. 16; Lester, 2017: 28.
Meioceras crossei de Folin, 1869a: 27, fig. 7 — Kisch, 1959: 39; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 21, fig. 17.
Meioceras deshayesi de Folin, 1869a: 27, fig. 6 — Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 19, fig. 13; Lester, 2017: 27.
Meioceras moreleti de Folin, 1869a: 26, fig. 5 — Kisch, 1959: 40; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 21, fig. 18–19; Lester, 2017: 27.
Meioceras subinflexum de Folin, 1869b: 165, pl. 23, fig. 8 — Abbott, 1974: 94; Gomes, 1999: 22, fig. 20; Lester, 2017: 27.
Meioceras undulosum de Folin, 1869a: 28, fig. 8 — Kisch, 1959: 40; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 22, fig. 21–22; Lester, 2017: 27.
Meioceras fischeri de Folin, 1870: 188, pl. 26, fig. 3–4 — Kisch, 1959: 40; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 24, fig. 26; Lester, 2017: 28.
Meioceras imiklis de Folin, 1870: 189, pl. 26, fig. 5–6 — Kisch, 1959: 40; Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 24, fig. 27; Lester, 2017: 28.
Meioceras contractum de Folin, 1874: 213, pl. 9, fig. 7 — Lester, 2017: 28.
Meioceras leoni Bérillon in de Folin, 1874: 251, pl. 10, fig. 4 — Moore, 1972: 892; Abbott, 1974: 94; Gomes, 1999: 25, fig. 28–29.
Meioceras elongatum de Folin, 1881: 17, fig. 9 — Vannozzi, 2019: 35, fig. 1–4.
Meioceras cingulatum Dall, 1892: 302, pl. 16, fig. 6–7 — Moore, 1972: 892; Lester, 2017: 28.
Caecum (Meioceras) lermondi Dall, 1924: 7 — Lester, 2017: 28; Moore, 1972: 892; Gomes, 1999: 26, fig. 31.
Meioceras apanium Woodring, 1928: 351, pl. 26, fig. 11–12 — Moore, 1972: 892.
Meioceras amblyoceras Woodring, 1959: 163, pl. 31, fig. 1 — Moore, 1972: 892.
Original diagnosis — "Shell arcuated, thin, pellucid; surface white, shining, glabrous, with indistinct striae of growth; aperture very oblique, in diameter about two thirds that of the shell at its broadest part, which is at the middle. The shell is contracted at its posterior extremity. Thus, the inner outline is much shorter and less curved than the outer one." Stimpson (1851: 112).
Referred Specimens —LACMIP 43085.15 (1 specimen), LACMIP 43085.16 (5 specimens), LACMIP 43085.17 (6 specimens), LACMIP 43085.18 (94 specimens).
Occurrence — Known only from immediately above and below the Thylacodes beds near the base of section SC 3 in Super Creek, Riverside County, California.
Description —Protoconch and subadult stages not observed. Teleoconch average size for genus [Tol: 1.74–2.40 mm], tubular, strongly arched dorsal profile, mildly arched or bulbous ventral profile [Larc: 0.52–0.80 mm; Arc: 0.08–0.22 mm], narrow posterior end, inflated middle region and contracted apertural end, creamy white. Surface smooth except for occasional growth lines. Posterior [Dpe: 0.30–0.39 mm] with thin edge. Septum mucronate, slightly raised to recessed. Mucro with prominent rounded point, positioned along dorsal margin. Aperture [Da: 0.40–0.54 mm] simple, strongly oblique. Lip smooth, well defined.
Discussion — Meioceras nitidum is extremely variable in the degree of mid-teleoconch swelling. Slender forms can be difficult to distinguish from M. cornucopiae Carpenter, 1859. However, the sides of M. cornucopiae are more parallel regardless of how pronounced the dorsal arch.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Caecidae
- Genus
- Meioceras
- Kingdom
- Animalia
- Order
- Littorinimorpha
- Phylum
- Mollusca
- Scientific name authorship
- Stimpson
- Species
- nitidum
- Taxon rank
- species
- Taxonomic concept label
- Meioceras nitidum (Stimpson, 1851) sec. Raines, 2023
References
- Stimpson, W. 1851. Monograph of the genus Caecum in the United States. Proceedings of the Boston Society of Natural History 4: 112 - 113.
- Dall, W. H. 1892. Contributions to the Tertiary fauna of Florida, with special reference to the Miocene silex-beds of Tampa and the Pliocene beds of the Caloosahatchie River. Part II. Streptodont and other gastropods, concluded. Transactions of the Wagner Free Institute of Science of Philadelphia, Philadelphia 3: 201 - 473.
- Morse, E. 1919. New forms of Caecum in New England. The Nautilus, 32 (3): 73 - 77.
- Moore, D. R. 1972. Ecological and Systematic notes on Caecidae from St. Croix and Virgin Islands. Bulletin of Marine Science, Coral Gables 22 (4): 881 - 899.
- Abbott, R. T. 1974. American Seashells. Van Nostrand Reinhold, New York. 663 pp.
- Vokes, H. E., and E. H. Vokes. 1983. Distribution of shallow-water marine Mollusca, Yucatan Peninsula, Mexico. Middle American Research Institute Publication, New Orleans, 54: 1 - 183.
- Mello, R. de L. S. & P. Maestrati. 1986. A Familia Caecidae Gray, 1850 no nordeste do Brasil. Cadernos Omega da Universidade Federal Rural de Pernambuco, Serie Ciencias Aquaticas. Recife. 2: 145 - 166.
- Lightfoot, J. 1992. Caecidae of the Western Atlantic, Part II. Of Sea & Shore 15: 23 - 32.
- Rios, E. C. 1994. Seashells of Brazil. FundaCao Universidade do Rio Grande, Rio Grande. 368 pp.
- Bandel, K. 1996. Phylogeny of the Caecidae (Caenogastropoda). Mitteilungen aus dem Geologisch- Palaontologisches Institut der Universitat Hamburg 79: 53 - 115.
- Gomes, R. S. and R. S. Absalao. 1996. Lista comentada e ilustrada dos Caecidae (Mollusca, Prosobranchia, Mesogastropoda) da OperaCAo Oceanografica Geomar XII. Revista Brasileira de Zoologia 13 (2): 513 - 531.
- Oliveira, M. P., and M. N. Almeida. 1999. ContribuiCao ao conhecimento da familia Caecidae (Mollusca, Gastropoda) no Brasil. Strombus, Sao Paulo, 4: 1 - 12.
- Daccarett, E. Y., and V. S. Bossio. 2011. Colombian Seashells from the Caribbean Sea. L'Informatore Piceno, 384 pp.
- Gomes, R. S. 1999. As especies recentes reportadas para o Genero Meioceras Carpenter, 1858 (Mollusca: Caenogastropoda: Caecidae) no Atlantico Oeste. Universidade Federal do Rio de Janeiro, Brasil, 69 pp.
- Redfern, C. 2013. Bahamian Seashells 1161 Species from Abaco, Bahamas. Bahamian Seashells, Inc, Boca Raton. 501 pp.
- Lester, A. S. 2017. Caecidae (Mollusca: Gastropoda) in Broward County, Florida. M. S. thesis, Nova Southeastern University.
- Lamy, D., and J. P. Pointier. 2017. Marine and Freshwater Molluscs of the French Caribbean. PLB Editions. 784 pp.
- Egger, C., T. P. Neusser, J. Norenburg, F. Leasi, B. Buge, A. Vannozzi, R. L. Cunha, C. J, Cox, C. J., and K. M. Joerger. 2020. Uncovering the shell game with barcodes: diversity of meiofaunal Caecidae snails (Truncatelloidea, Caenogastropoda) from Central America. Zookeys 968: 1 - 42.
- Costa, F. M. P., A. M. S. Pires-Vanin, and S. F. B. Lima. 2021. Caecidae (Gastropoda: Truncatelloidea) associated with unconsolidated carbonate substrates of the Abrolhos coral bank (Bahia State, Brazil). American Malacological Bulletin 38 (2): 83 - 88.
- Folin, L. de. 1868. Baie de Bahia. Les Fonds de la Mer 1: 48 - 51.
- Folin, L. de. 1869 a. Le genre Meioceras. Annales de la Societe Linneenne de Maine et Loire, 11: 17 - 31.
- Kisch, B. S. 1959. La Collection de Caecidae Marquis de Folin au Museum National d'Histoire Naturelle. Journal de Conchyliologie 99: 15 - 42.
- Folin, L. de. 1869 b. Addition aux mollusques de la Nouvelle- Providence. Les Fonds de la Mer 1: 163 - 165.
- Folin, L. de. 1870. Vera-Cruz et Carmen. Les Fonds de la Mer 1: 181 - 191.
- Folin, L. de. 1874. Sur les cotes du Bresil. Les Fonds de la Mer 2: 210 - 214.
- Folin, L. de. 1881. Quelques Caecidae des mers de Chine. Pp. 16 - 17, in L. de Folin, and L. Perier, eds., Les Fonds de la Mer 4 (1 - 2).
- Vannozzi, A. 2019. The identity of Meioceras elongatum de Folin, 1881 (Gastropoda, Caenogastropoda, Caecidae). Basteria, 83 (1 - 3): 35 - 38.
- Dall, W. H. 1924. A remarkable caecid from Florida. The Nautilus 38 (1): 7 - 8.
- Woodring, W. P. 1928. Miocene Mollusks from Bowden, Jamaica. Part II. Gastropods and discussion of results. Carnegie Institute of Washington Publication, Washington 385: 564 pp.
- Woodring, W. P. 1959. Geology and paleontology of Canal Zone and adjoining parts of Panama: Description of Tertiary mollusks (Gastropods: Vermetidae to Thaididae). U. S. Geological Survey Professional Paper 306 - B: 147 - 239.