TY - JOUR
AU - WALKER, MURIEL, H.
AB - Abstract During embryonic development the process of segment formation in both families of the Onychophora, the Peripatidae and the Peripatopsidae, follows an essentially similar pattern with the exception of the South African peripatopsid, Opisthopatus cinctipes Purcell. In all other species in which development has been described, paired lateral halves of the embryo, separated by extra-embryonic ectoderm, develop as thickened bands on the surface of the blastoderm coincident with the appearance of the mouth and anus. The bands quickly differentiate paired segmental swellings with intersegmental grooves. The body elongates by proliferation from a posterior growth zone. During this process, presumptive mesoderm, located posteriorly in the early embryo, proliferates and moves anteriorly to form two lateral bands of mesodermal cells which segment during their forward growth into an anterior-posterior sequence of paired somites. 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TI - Relatively recent evolution of an unusual pattern of early embryonic development (long germ band?) in a South African onychophoran, Opisthopatus cinctipes Purcell (Onychophora: Peripatopsidae)
JF - Zoological Journal of the Linnean Society
DO - 10.1111/j.1096-3642.1995.tb00112.x
DA - 1995-05-01
UR - https://www.deepdyve.com/lp/oxford-university-press/relatively-recent-evolution-of-an-unusual-pattern-of-early-embryonic-fkCcm7FS0O
SP - 61
EP - 75
VL - 114
IS - 1
DP - DeepDyve
ER -