TY - JOUR
T1 - Metamorphosis of the loop in Cenozoic dallinacean brachiopods and its developmental constraint
AU - GUNJI, YUKIO
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1987/7
Y1 - 1987/7
N2 - Gunji, Yukio 1987 07 15: Metamorphosis of the loop in Cenozoic dallinacean brachiopods and its developmental constraint. The well‐known metamorphosis of loop development in select species of Dallinacea is investigated by numerical analysis. It is shown how loop transformation depends on the location of the ‘loop center’, that stage forms are determined by the position of the center, and that there may be two ‘shift directions’. The succession found in Campages, Laqueur and Dallina can be explained by a posterior shift, while the succession found in Terebratalia and Coptothyris is explained by an anterior shift. These two directions may be linked, because both are found in a single species Nipponithyris afra. Loop development in species of Dallinacea can therefore be transformed through variation of a specific constraint; this is regarded as an example of developmental constraint. Developmental constraints as common features are useful in studying comparative morphology during ontogeny and phylogeny.
AB - Gunji, Yukio 1987 07 15: Metamorphosis of the loop in Cenozoic dallinacean brachiopods and its developmental constraint. The well‐known metamorphosis of loop development in select species of Dallinacea is investigated by numerical analysis. It is shown how loop transformation depends on the location of the ‘loop center’, that stage forms are determined by the position of the center, and that there may be two ‘shift directions’. The succession found in Campages, Laqueur and Dallina can be explained by a posterior shift, while the succession found in Terebratalia and Coptothyris is explained by an anterior shift. These two directions may be linked, because both are found in a single species Nipponithyris afra. Loop development in species of Dallinacea can therefore be transformed through variation of a specific constraint; this is regarded as an example of developmental constraint. Developmental constraints as common features are useful in studying comparative morphology during ontogeny and phylogeny.
KW - Dallinacea
KW - Developmental constraint
KW - loop metamorphosis
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U2 - 10.1111/j.1502-3931.1987.tb00784.x
DO - 10.1111/j.1502-3931.1987.tb00784.x
M3 - Article
AN - SCOPUS:85047692585
VL - 20
SP - 239
EP - 255
JO - Lethaia
JF - Lethaia
SN - 0024-1164
IS - 3
ER -