TY - JOUR
T1 - Developmental constraints conserve evolutionary pattern in an osteichthyan dentition
AU - Smith, Moya Meredith
AU - Krupina, Natasha I.
AU - Joss, Jean
PY - 2002
Y1 - 2002
N2 - The lungfish dentition is different from other osteichthyan fish because it has a characteristic and unique pattern of teeth arranged as toothplates. Growth, addition of teeth, and retention as part of a statodont dentition are determined by the initiation pattern. In adult lungfish new teeth are only added laterally to each radial row in the dentition. This is in marked contrast to marginal rows of teeth with regular, alternating replacement in most osteichthyans. We analyze development from fossil hatchling forms of the Late Devonian dipnoan Andreyevichthys and compare with those of Neoceratodus, the Australian lungfish. The specific pattern of development, unique within lungfish, is also present in the transitory, marginal, anterior dentition in both, reflecting a strongly conserved developmental pattern. These marginal teeth form but are then lost in both, so that also this program of development is conserved within lungfish for 360 million years, from the earliest known form.
AB - The lungfish dentition is different from other osteichthyan fish because it has a characteristic and unique pattern of teeth arranged as toothplates. Growth, addition of teeth, and retention as part of a statodont dentition are determined by the initiation pattern. In adult lungfish new teeth are only added laterally to each radial row in the dentition. This is in marked contrast to marginal rows of teeth with regular, alternating replacement in most osteichthyans. We analyze development from fossil hatchling forms of the Late Devonian dipnoan Andreyevichthys and compare with those of Neoceratodus, the Australian lungfish. The specific pattern of development, unique within lungfish, is also present in the transitory, marginal, anterior dentition in both, reflecting a strongly conserved developmental pattern. These marginal teeth form but are then lost in both, so that also this program of development is conserved within lungfish for 360 million years, from the earliest known form.
KW - Constraints
KW - Dentition
KW - Development
KW - Evolution
KW - Lungfish
KW - Toothplates
UR - http://www.scopus.com/inward/record.url?scp=0035996433&partnerID=8YFLogxK
U2 - 10.1080/03008200290000925
DO - 10.1080/03008200290000925
M3 - Article
C2 - 12489146
AN - SCOPUS:0035996433
SN - 0300-8207
VL - 43
SP - 113
EP - 119
JO - Connective Tissue Research
JF - Connective Tissue Research
IS - 2-3
ER -