Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Supernumerary molars in neotropical opossums (Didelphimorphia, Didelphidae)
Autore:
de Moraes, DA; Lemos, B; Cerqueira, R;
Indirizzi:
Univ Sao Paulo, Dept Zool, BR-05422970 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-05422970 BC05422970 Sao Paulo, Brazil Univ Fed Rio de Janeiro, Dept Ecol, Lab Vertebrados, BR-21941590 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21941590 BCeiro, Brazil
Titolo Testata:
MAMMALIAN BIOLOGY
fascicolo: 4, volume: 66, anno: 2001,
pagine: 193 - 203
SICI:
1616-5047(2001)66:4<193:SMINO(>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
DENTAL ANOMALIES; TEETH;
Keywords:
marsupials; abnormalities; dentition; neotropics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: de Moraes, DA Univ Sao Paulo, Dept Zool, CP 11461, BR-05422970 Sao Paulo, Brazil Univ Sao Paulo CP 11461 Sao Paulo Brazil BR-05422970 BCazil
Citazione:
D.A. de Moraes et al., "Supernumerary molars in neotropical opossums (Didelphimorphia, Didelphidae)", MAMM BIOL, 66(4), 2001, pp. 193-203

Abstract

Dental abnormalities, such as the occurrence of extra teeth, are recurrently found in many groups of mammals. Supernumeray molars were found in Didelphis aurita, D. albiventris, D. marsupialis, Philander andersoni, A frenota, P. opossum, Chironectes minimus, and Caluromys philander. Frequencies of occurrence of supernumerary teeth in these marsupial species remained within a range similar to that found in other species. Four hypotheses are proposed and discussed to explain the origin of these teeth: appearance of extrateeth due to excessive development in size of the skull, reappearance of an atavistic condition, retention of the third deciduous premolar at the eruption of the permanent premolar, or some sort of ontogenetic disturbance that Lead to the duplication of a tooth germ. The first hypothesis is discarded as all individuals have normal sizes for the species. No evidence in themarsupial fossil record supports the second. The morphology of the teeth observed does not support the third, as a[[ teeth are apparently permanent (except for one specimen). Finally it is hard to find evidence against or infavour of the fourth, as there is no information available of the development of the museum specimens observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 12:47:51