Abstract:
:Developmental studies of the Recent Australian lungfish, Neoceratodus forsteri, show that this species has two sets of functional tooth-bearing bones in the lower jaw of young hatchlings. These coincide with an early stage in the life history when the fish is strictly carnivorous. In N. forsteri, a paired tooth-bearing dentary and an unpaired symphyseal bone and tooth develop slightly later than the permanent vomerine, prearticular, and pterygopalatine tooth plates, which appear at stage 44 of development, and erupt with the permanent dentition between stages 46 and 48, when the hatchling first starts to feed on small aquatic invertebrates. At these stages of development, all of the teeth are long, sharp, and conical and help to retain prey items in the mouth. Disappearance of the transient dentition coincides with complete eruption of the permanent tooth plates and precedes the change to an omnivorous diet. Existence of a transient marginal dentition in this species of lungfish suggests that the presence of an apparently similar marginal dentition in adults of many species of Palaeozoic dipnoans should be considered in phylogenetic analyses of genera within the group, and when analysing the relationships of dipnoans with other primitive animals. © 1995 Wiley-Liss, Inc.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Kemp Adoi
10.1002/jmor.1052250306subject
Has Abstractpub_date
1995-09-01 00:00:00pages
345-355issue
3eissn
0362-2525issn
1097-4687journal_volume
225pub_type
杂志文章abstract::Whole body studies of Plotosus tandanus revealed that ampullary pores occur over the entire body of the fish, but are in higher concentrations in the head region. These pores give rise to a short canal (50-60 microm) produced by columnar epithelial cells bound together by tight junctions and desmosomes. At the junctio...
journal_title:Journal of morphology
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更新日期:2003-02-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2007-10-01 00:00:00
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更新日期:2002-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of morphology
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更新日期:1995-07-01 00:00:00
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abstract::Bioluminescent organs have evolved many times within teleost fishes and exhibit a wide range of complexity and anatomical derivation. Although some bioluminescent organs have been studied in detail, the morphology of the bacterial light organs in glowbellies (Acropoma) is largely unknown. This study describes the anat...
journal_title:Journal of morphology
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更新日期:2018-11-01 00:00:00