Jason Hodin

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The moss animal (phylum Bryozoa), Bugula
eggs
lophophore
Jason Hodin
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(No Transcript)
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http//faculty.washington.edu/bjswalla/
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Figure 1. Harrimania planktophilus. Total length
of a relaxed and uncoiled animal is
approximately 32 mm. c, collar gp, gill pores
m, mouth p, proboscis t, trunk.
from Cameron, CB (2002) The Anatomy, Life
Habits, and Later Development of a New Species
of Enteropneust, Harrimania planktophilus
(Hemichordata Harrimaniidae) From Barkley Sound
Biol. Bull. 202 182191.
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Figure 5. Diagram of Harrimania planktophilus in
situ with a cylindrical mass of embryos. A
tentatively undescribed species of enteropneust,
Saccoglossus (a surface deposit feeder), is
sympatric with H. planktophilus at Cape Beale.
c, collar p, proboscis t, trunk.
from Cameron, CB (2002) The Anatomy, Life
Habits, and Later Development of a New Species
of Enteropneust, Harrimania planktophilus
(Hemichordata Harrimaniidae) From Barkley Sound
Biol. Bull. 202 182191.
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Figure 1. Scanning electron microscope images of
sectioned material of H. planktophilus. (A) The
dorsal branchial pharynx, showing the primary
bars, tongue bars, and gill slits. (C) Cilia and
mucus on a gill bar. (C inset) High-magnification
image of cilia on a tongue bar. ebr,
epibranchial region eo, esophageal organ gb,
primary or gill bar tb, secondary or tongue
bar gs,gill slit.
from Cameron, CB (2002) Particle Retention and
Flow in the Pharynx of theEnteropneust Worm
Harrimania planktophilus The Filter-Feeding
Pharynx May HaveEvolved Before the Chordates
Biol. Bull. 202 192-200.
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Figure 2. Organization of the filter-feeding
morphology of Harrimania planktophilus. bs,
branchial sac c, collar cl, collar lip dp,
digestive pharynx ebr, epibranchial region eo,
esophagus organ gb, gill bar gp, gill pore gs,
gill slit m, mouth p, proboscis poco,
pre-oral ciliary organ pr, parabranchial ridge
tb, tongue bar.
from Cameron, CB (2002) Particle Retention and
Flow in the Pharynx of theEnteropneust Worm
Harrimania planktophilus The Filter-Feeding
Pharynx May HaveEvolved Before the Chordates
Biol. Bull. 202 192-200.
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Phylum (?) Urochordata
like other chordates dorsal hollow nerve chord,
notochord, pharyngeal gill slits,
endostyle unique features tadpole larva (in
most), notochord resorbed at metamorphosis (in
most), DNA evidence classes Ascidiacea (sea
squirts solitary, colonial, compound) Thaliacea
(doliolids, salps...) Larvacea (larvaceans
appendicularians)
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http//www.ucmp.berkeley.edu/chordata/urochordata.
html
Rhopalia ?
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incurrent ("buccal") siphon
cerebral ganglion
excurrent ("atrial") siphon
body wall muscles (?)
atrium
branchial basket
anus
endostyle ("thyroid gland")
gonoduct
gonoduct
tunic
body wall
gonad
heart
stomach
http//cas.bellarmine.edu/tietjen/images/urocho2.j
pg
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(common) excurrent siphon
(individual) incurrent siphons
Botryllus planus
Thomas Stach
Indian River Lagoon, FL approx. size of rosette
3-5mm
http//www.ascidians.com/
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the compound ascidian, Polyclinum
from Kozloffs Invertebrates after Van Name
http//www.ulstermuseum.org.uk/marinelife/tunicata
/polaur.htm
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the solitary sea squirt Ciona, showing muscle
bands
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embryo (A), larva (B) and metamorphosis (C-G) of
the solitary sea squirt Ciona intestnalis
Arjan Gittenberger
http//www.ascidians.com/
from Kozloffs Invertebrates after Berrill
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larva of the compound sea squirt, Distaplia
Arjan Gittenberger
http//home.hetnet.nl/ascidians/ localities/swsul
awesi.htm
from Kozloffs Invertebrates figures by Richard
Cloney
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colonial species
http//faculty.washington.edu/bjswalla/Urochordata
/urochordata.htm
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Oikopleura diodica - a larvacean
("appendicularian") - without and with its
house inset close up of a mature, O. diodica
head, filled with eggs
http//www.miljolare.no/virtue/newsletter/01_06/sc
i-sars/more-info/background/od.php
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larvacean (Oikopleura) head structures
Jean-Marie Cavanihac
http//www.microscopy- uk.org.uk/mag/artdec00/ tun
icc3.html
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Jean-Marie Cavanihac
A doliolid
http//www.microscopy-uk.org.uk/mag/artdec00/tunic
c2.html
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larvacean animation http//www.at-sea.org/mission
s/append/append.html
video clips (larvaceans, doliolids, sea
squirts) http//www.microscopy-uk.org.uk/mag/artd
ec00/video1.html http//www.microscopy-uk.org.uk/
mag/artdec00/video2.html