heterodont
Language: English
Part of speech: noun
Pronunciation: ipa: /ˈhɛtəɹəʊdɒnt/
ipa: /ˈhɛtɹəʊdɒnt/
ipa: /ˈhɛtəɹəˌdɑnt/
ipa: /ˈhɛtɹə-/
ipa: [-ɾəɹə-]
ipa: [-ɾɹə-]
Forms: form: heterodonts
Etymology: From hetero- (prefix meaning ‘different’) + -odont (suffix meaning ‘tooth; toothed’). Hetero- is derived from Ancient Greek ἕτερος (héteros, “one or the other of two; different”), ultimately from Proto-Indo-European *sem- (“together; one”); while -odont is from Ancient Greek ὀδούς (odoús, “tooth; tusk”), ultimately from Proto-Indo-European *h₃ed- (“to bite”) + *-ónts (suffix forming nouns denoting body parts). By surface analysis, hetero- + -odont.
Senses: examples: text: [A]mongst heterodonts there are several Rodents which have no deciduous teeth, e.g., the rat; […] Among Marsupials, which are true heterodonts, there is only one milk molar on each side in each jaw; […]
ref: 1876, Charles S[issmore] Tomes, “The Teeth of Mammals”, in A Manual of Dental Anatomy, Human and Comparative, London: J[ohn] & A[ugustus] Churchill, […], pages 276–277:
text: On the other hand, in the Mammalian orders with two sets of teeth, these organs are said to acquire fixed individual characters, to receive special denominations, and can be determined from species to species, being equivalent to the Heterodonts. The author [William Henry Flower] then showed that […] among the Heterodonts many were partially, and probably some completely, Monophyodonts.
ref: 1868, “Quarterly Chronicle of Microscopical Science”, in Edwin Lankester, George Busk, editors, Quarterly Journal of Microscopical Science, volume VIII (New Series; volume XVI overall), London: John Churchill and Sons, […], →OCLC, pages 277–278:
text: We have Homodonts, or animals with teeth quite homogeneous in shape, and Heterodonts, those having teeth of dissimilar shapes, the large majority of mammals being Heterodonts.
ref: 1878 June, C. N. Peirce, “Proceedings of Dental Societies. Alumni Association of the Pennsylvania College of Dental Surgery. [The Varieties of Teeth Found in Animals; Their Muco-dermal Origin, and How the Blending of Their Different Forms in the Class Mammalia Favors the Theory that They are but Modifications from Some Common Ancestral Type.]”, in James W. White, editor, The Dental Cosmos: A Monthly Record of Dental Science. […], volume XX, number 6, Philadelphia, Pa.: Samuel S. White, […], →OCLC, page 320:
text: In the aberrant Orycteropus (Aard-Vark), with ten adult teeth, [Oldfield] Thomas finds seven milk teeth behind the maxillary suture (thus taking us into the molar region of the typical heterodonts).
ref: 1894 January 4, “The Rise of the Mammalia in North America”, in Nature: A Weekly Illustrated Journal of Science, volume XLIX, number 1262, London; New York, N.Y.: Macmillan and Co., →OCLC, page 238, column 2:
text: In the past, this would have been enough to allow one to suggest a close relationship between hybodonts and heterodonts. However, Campagno (1977) has recently attempted to show that hybodonts belong to a more derived position within the euselachians, specifically being allied with the galeoid oryctoloboids and lamnoids. If this is the case, the absence of the orbital process in heterodonts might be considered a highly derived condition and the overall close similarity of the palates of the two groups a convergence due perhaps to a common pattern of fore-and-aft jaw movements.
ref: 1981 April 2, Keith Stewart Thomson, “An Early Triassic Hybodont Shark from Northern Madagascar”, in Postilla, number 186, New Haven, Conn.: Peabody Museum of Natural History, Yale University, published 15 February 1982, →ISSN, →OCLC, page 13, column 1:
topics: biology
natural-sciences
zoology
glosses: A heterodont animal.
examples: text: Ordovician actinodontoids are probably ancestral to the heterodonts, unionaceans, and trigoniaceans.
ref: 1971, Robert A[llen] Cadigan, “Moenkopi Formation and Related Strata”, in Robert A. Cadigan, J. H. Stewart, Petrology of the Triassic Moenkopi Formation and Related Strata in the Colorado Plateau Region: […] (Geological Survey Professional Paper; 692), Washington, D.C.: United States Government Printing Office, →OCLC, page 30, column 2:
text: Finally, Carditoidea is basal not only to all other sampled heterodonts but also to Anomalodesmata. This is unexpected; although they appear to be relatively primitive heterodonts, they are mophologically similar to other heterodonts exclusive of anomalodesmatans. More molecular data for other primitive heterodonts are needed to test this result, especially Crassatelloidea and Lucinoidea.
ref: 2000, D. C. Campbell, “Molecular Evidence on the Evolution of the Bivalvia”, in E[lizabeth] M. Harper, J[ohn] D[avid] Taylor, J. A. Crame, editors, The Evolutionary Biology of the Bivalvia (Geological Society Special Publication; no. 177), London: Geological Society of London, →ISBN, →ISSN, page 44, column 1:
topics: biology
malacology
natural-sciences
zoology
glosses: A heterodont animal.
A heterodont bivalve.
examples: text: The second suborder (Macrosformes) corresponds with the Heteroderms of M. André Marie Constant Duméril. These are divided into seven families: […] 4. the Heterodonts, (Dendrophis, Coronella, &c.); […]
ref: 1841, “REPTILES”, in [George Long], editor, The Penny Cyclopædia of the Society for the Diffusion of Useful Knowledge, volumes XIX (Primaticcio–Richardson), London: Charles Knight and Co., […], →OCLC, page 409, column 2:
glosses: A snake of the genus Heterodon which is native to North America.
Derived terms: palaeoheterodont