- a coenecium. The
discovery of the stem
group hemichordate Gyaltsenglossus shows that
early hemichordates combined aspects of the two
morphologically disparate...
-
hemichordates also have a
tubular nerve cord. In the
early embryonic stage, it
looks like the
hollow nerve cord of chordates. Both the
hemichordates and...
-
pterobranch hemichordate.
Opinions differ about whether the
Chengjiang fauna fossil Yunnanozoon, from the
earlier Cambrian, was a
hemichordate or chordate...
-
repeated segments are
controlled by
similar developmental mechanisms. Some
hemichordate species can have as many as 200 gill slits.
Pharyngeal clefts resembling...
- to be
related to the hydrozoans; now they are
widely recognized as
hemichordates. The name "graptolite"
originates from the
genus Graptolithus ("writing...
- or
Enteropneusta are a
hemichordate class of
invertebrates consisting of one
order of the same name. The
closest non-
hemichordate relatives of the Enteropneusta...
-
echinoderms and
hemichordates; a
member of this
group is
called an ambulacrarian.
Phylogenetic analysis suggests the
echinoderms and
hemichordates separated...
- Echinoderms,
hemichordates, cephalochordates,
urochordates Vertebrates...
- taxa
reported from this ****emblage (purported sponges, algae, a worm, a
hemichordate tube and a lobopod) are
actually trace fossils (mostly
burrows containing...
-
annelids and nematodes; and the deuterostomes,
which include echinoderms,
hemichordates and chordates, the
latter of
which contains the vertebrates. The much...
