The tubes provide a key missing link that connects the two main hemichordate
Although the two phyla appear quite different today, chordates are often linked with the hemichordates
and another dissimilar phylum, the echinoderms, which include starfish.
Reproductive periodicity, spawning induction, and larval metamorphosis of the hemichordate
acorn worm Ptychodera flava.
Identical genomic organization of two hemichordate
Here we present a molecular phylogeny of Hemichordata that includes novel sequence data from 35 taxa representing all hemichordate
families, at least 12 of which are distinct genetic lineages not attributable to known species.
Coleodesmium karaensis is the first enteropneust species (and indeed the first hemichordate
) ever found to brood embryos externally on the maternal surface.
Deuterostome evolution: early development of the enteropneust hemichordate
. Prychodera flava.
This inquiry was not an effort to illuminate phylogeny but merely to determine which of the well-studied animals have sequences most similar to those of this hemichordate
. Using BLASTx, we compared the S.
Isolation of Hox and Parahox genes in the hemichordate
Ptychodera flava and the evolution of deuterostome Hox genes.
In relation to HcAs, our data corroborate previous findings of HcAs in hemichordates
, sponges, and ctenophores (Martin-Duran et al., 2013).
Until now, the earliest deuterostomes scientists have discovered were between 510 and 520 million years old, when they had already begun to diversify into vertebrates, sea squirts, echinoderms such as starfish and sea urchins, and hemichordates
Thus, the objectives of this study were to make accessible data on the abundances of sipunculans, brachiopods and hemichordates
(1984-1987, 2013) at a sand-mud flat; and on trace metals (1996, 2000) and abundances (2015) of sipunculans and brachiopods at a sand flat in the upper Gulf of Nicoya estuary.