First records of coalescence and hypomerism in Tonicia atrata (Polyplacophora, Chitonidae) in the Southwestern Atlantic Ocean

Camila Guillén, Diego Gaston Urteaga

Resumen


The first cases of anomalies in the number of shell-plates in Tonicia atrata (Sowerby II, 1840) are herein reported on the basis of three specimens from Zaratiegui Bay, Tierra del Fuego, Argentina (54°50’53’’ S, 68°29’7’’ W): two cases of coalescence (one symmetrical and another one asymmetrical) and a case of hypomerism. The abnormal specimens bore less ctenidia than physiological conspecific specimens of similar size. The symmetrical coalescent specimen and the hypomeric individual were significantly wider (higher width/length ratio) than physiological specimens. Nevertheless, the reported abnormalities seem to have no effect on general growth, since the body size of the abnormal specimens were close to the largest physiological ones found in the same locality.


Palabras clave


TERATOLOGY; MORPHOLOGY, MOLLUSCA; ARGENTINA, PATAGONIA

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Referencias


Baschieri, L., B. Dell'Angelo & S. Palazzi. 1992. Recenti ritrovamenti di Polyplacophora anomali nel Mediterraneo. Bollettino Malacologico, 28: 65–68.

Castellanos, Z.J.A. de. 1988. Catálogo descriptivo de la malacofauna marina magallánica 1. Los Placóforos. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, La Plata, 41pp.

Crozier, W.J. 1919. Coalescence of the Shell-Plates in Chiton. The American Naturalist, 53(626): 278–279.

Dell'Angelo, B. 1985. Ipermeria in Acanthochitona (Mollusca: Polyplacophora) delle coste livornesi. Quaderni del Museo di Storia Naturale di Livorno, 5: 77–80.

Dell'Angelo, B. & A. Tursi. 1990. Abnormalities in chitons sell-plates. Oebalia, 14(1): 1–14.

Dell'Angelo, B., C. Lombardi & S. Ventimiglia. 1998. Due nuove segnalazioni di ipermeria in Poliplacofori. La Conchiglia, 30(287): 15–16.

Dell'Angelo, B. & S. Cianfanelli. 2002. Una nuova segnalazione di ipermeria nei molluschi poliplacofori. Atti della Società Toscana di Scienze Naturali, Memorie serie B, 109: 27–28.

Dell'Angelo, B. & E. Schwabe. 2010. Teratology in chitons (Mollusca, Polyplacophora): a brief summary. Bollettino Malacologico, 46: 9–15.

Gálvez Herrera, O. 1991. Hipomería en Plaxiphora fernandezi Thiele, 1909 (Mollusca, Polyplacophora). Noticiario Mensual del Museo Nacional de Historia Natural, 318: 3–4.

Kaas, P., R. Van Belle & H.L. Strack. 2006. Monograph of Living Chitons (Mollusca: Polyplacophora). 6. Suborder Ischnochitonina (concluded):Schizochitonidae & Ischnochitonidae. Additions to Volumes 1 - 5. E. J. Brill, Leiden - New York - Koln.

Kniprath, E. 1980. Ontogenetic plate and plate field development in two chitons, Middendorffia and Ischnochiton. Wilhelm Roux’s Archives of Developmental Biology, 189: 97–106.

Langer, P.D. 1978. Abnormality of shell plates in three chitons from New England. The Veliger, 21(2): 274–275.

Pastorino, G. 1995. Moluscos costeros recientes de Puerto Pirámide, Chubut, Argentina. Academia Nacional de Ciencias, 93: 3–30.

Pelseneer, P. 1919. La métamérie et l'hypomérie chez les chitons. Annales de la Société Royale Zoologique et Malacologique de Belgique, 50: 41–43.

Pelseneer, P. 1920. Les variations et leur hérédité chez les Mollusques. Mémoires de l’Académie Royale de Belgique, 2(5): 1–826.

Plate, L.H. 1898. Die Anatomie und Phylogenie der Chitonen. Fauna Chilensis 1(1). Zoologische Jahrbücher. Supplementheft, Suppl. 4: 1–243, figs. A-B, pls 1-12.

Roth, B. 1966. Some abnormal chitons from Washington State. The Veliger, 9(2): 249–250.

Sirenko, B.I. 2006. Report on the Present State of our Knowledge with Regard to the Chitons (Mollusca: Polyplacophora) of the Magellan Strait and Falkland Islands. Venus, 65(1-2): 81–89.

Sirenko, B.I. & S.D. Kashenko. 1990. Larval development of Ischnochiton hakodadensis Pilsbry (Polyplacophora, Ischnochitonidae) under normal conditions and at salinity changes. Biologia Morya, 1: 43–51.

Sowerby, G.B. 1840. Descriptions of some new chitons. Magazine of Natural History, Charlesworth. (ns) 4: 287–294, suppl. pl. 216.

Strohl, J. 1929. Mißbildulgen im Tier- und Pflanzenreich. Versuch einer veigleichenden Betrachtung.Verlag von Gustav Fischer, Jena.

Taki, I. 1932. On some cases of abnormality of the shellplates in chitons. Memoirs of the College of Science, Kyoto Imperial University (B), 8(1): 27–64, 22 pl.


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