Hemichordate Larva (Tornaria)

Cross references:  Hemichordates     Hemichordate Hormones     
Hemichordate Nerves   Hemichordate Neurotransmitters     Hemichordate Genomics    


tornaria - PubMed 
Result of searching PubMed for "tornaria".       

Results: 1 to 30 of 30   

Only the first 17 were relevant. 
1.

Development of the nervous system in the acorn worm Balanoglossus simodensis: insights into nervous system evolution.

Miyamoto N, Nakajima Y, Wada H, Saito Y.

Evol Dev. 2010 Jul-Aug;12(4):416-24.

PMID:
20618437
[PubMed - indexed for MEDLINE]

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2.

Molecular phylogeny of hemichordata, with updated status of deep-sea enteropneusts.

Cannon JT, Rychel AL, Eccleston H, Halanych KM, Swalla BJ.

Mol Phylogenet Evol. 2009 Jul;52(1):17-24. Epub 2009 Apr 5.

PMID:
19348951
[PubMed - indexed for MEDLINE]

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3.

The Spawning and Early Development of the Hawaiian Acorn Worm (Hemichordate), Ptychodera flava.

Tagawa K, Nishino A, Humphreys T, Satoh N.

Zoolog Sci. 1998 Jan 1;15(1):85-91.

PMID:
18429670
[PubMed - in process]

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4.

Morphology and development of a new species of Balanoglossus (Hemichordata: Enteropneusta: Ptychoderidae) from Shimoda, Japan.

Miyamoto N, Saito Y.

Zoolog Sci. 2007 Dec;24(12):1278-85.

PMID:
18271645
[PubMed - indexed for MEDLINE]

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5.

Light scattering by selected zooplankton from the Gulf of Aqaba.

Gagnon YL, Shashar N, Warrant EJ, Johnsen SJ.

J Exp Biol. 2007 Nov;210(Pt 21):3728-35.

PMID:
17951413
[PubMed - indexed for MEDLINE]
Free Article

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6.

Apical organs in echinoderm larvae: insights into larval evolution in the Ambulacraria.

Byrne M, Nakajima Y, Chee FC, Burke RD.

Evol Dev. 2007 Sep-Oct;9(5):432-45.

PMID:
17845515
[PubMed - indexed for MEDLINE]

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7.

Development of the enteropneust Ptychodera flava: ciliary bands and nervous system.

Nielsen C, Hay-Schmidt A.

J Morphol. 2007 Jul;268(7):551-70.

PMID:
17469131
[PubMed - indexed for MEDLINE]

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Only abstract available online. 
    "
Ripe specimens of Ptychodera flava were collected at Paiko Peninsula, Oahu, Hawaii, USA, and the development from egg to tornaria larva was followed in the laboratory. To complete the series, large tornaria larvae were collected from the plankton off the nearby Ala Moana Beach, and followed through metamorphosis to a juvenile stage with four pairs of gill slits. Ciliary band development was examined by scanning electron microscopy, and the development of the serotonergic nervous system was followed by means of immunostaining. The development of the apical tuft and neotroch (circumoral/perioral ciliary band) and their subsequent degeneration accorded fully with previous descriptions. A perianal ciliary ring of separate cilia develops just after hatching. This later develops a midventral extension, the neurotroch, extending to the neotroch posterior to the mouth. The cilia of this ring apparently beat diaplectically, with the effective stroke in the clockwise direction when seen from behind. An additional ring of cilia develops several days later anterior to the perianal ring. This opisthotroch (called telotroch by previous authors) consists at first of separate cilia, but later they became organized as large compound cilia. The apical tuft disappears after about a week, the neotroch degenerates at the transition to the Agassiz stage, and the opisthotroch degenerates just after metamorphosis. The serotonergic nervous system of the fully grown tornaria consists of an apical ganglion with many perikarya, a paired lateral group of perikarya on the postoral ciliary band, and scattered perikarya along the opisthotroch. Serotonergic processes are found along the ciliary bands except for the ventral and perianal ciliary bands and are scattered along the epidermis. At the Spengel stage and at metamorphosis (Agassiz stage), the processes along the ciliary bands are concentrated in the three ciliated food grooves so as to form three separate nerves, and are retained on the proboscis at least until 2-3 gill slit stage. No serotonergic processes were found to extend from the proboscis to the collar region, and no serotonergic neurons were observed in the collar cord or in the ventral nerve cord. Our results therefore do not provide any clues as to the origin of the chordate neural tube relative to the dorsal-ventral orientation of the enteropneusts.
"  



8.

The development of the enteropneust hemichordate Balanoglossus misakiensis KUWANO.

Urata M, Yamaguchi M.

Zoolog Sci. 2004 May;21(5):533-40.

PMID:
15170057
[PubMed - indexed for MEDLINE]

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9.

Development and neural organization of the tornaria larva of the Hawaiian hemichordate, Ptychodera flava.

Nakajima Y, Humphreys T, Kaneko H, Tagawa K.

Zoolog Sci. 2004 Jan;21(1):69-78.

PMID:
14745106
[PubMed - indexed for MEDLINE]

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10.

Conserved expression pattern of BMP-2/4 in hemichordate acorn worm and echinoderm sea cucumber embryos.

Harada Y, Shoguchi E, Taguchi S, Okai N, Humphreys T, Tagawa K, Satoh N.

Zoolog Sci. 2002 Oct;19(10):1113-21.

PMID:
12426473
[PubMed - indexed for MEDLINE]

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11.

Group B sox genes that contribute to specification of the vertebrate brain are expressed in the apical organ and ciliary bands of hemichordate larvae.

Taguchi S, Tagawa K, Humphreys T, Satoh N.

Zoolog Sci. 2002 Jan;19(1):57-66.

PMID:
12025405
[PubMed - indexed for MEDLINE]

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13.

Deuterostome evolution: early development in the enteropneust hemichordate, Ptychodera flava.

Henry JQ, Tagawa K, Martindale MQ.

Evol Dev. 2001 Nov-Dec;3(6):375-90.

PMID:
11806633
[PubMed - indexed for MEDLINE]

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14.

T-Brain expression in the apical organ of hemichordate tornaria larvae suggests its evolutionary link to the vertebrate forebrain.

Tagawa K, Humphreys T, Satoh N.

J Exp Zool. 2000 Apr 15;288(1):23-31.

PMID:
10750050
[PubMed - indexed for MEDLINE]

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15.

Developmental expression of the hemichordate otx ortholog.

Harada Y, Okai N, Taguchi S, Tagawa K, Humphreys T, Satoh N.

Mech Dev. 2000 Mar 1;91(1-2):337-9.

PMID:
10704860
[PubMed - indexed for MEDLINE]

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16.

Characterization of a hemichordate fork head/HNF-3 gene expression.

Taguchi S, Tagawa K, Humphreys T, Nishino A, Satoh N, Harada Y.

Dev Genes Evol. 2000 Jan;210(1):11-7.

PMID:
10603081
[PubMed - indexed for MEDLINE]

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17.

Novel pattern of Brachyury gene expression in hemichordate embryos.

Tagawa K, Humphreys T, Satoh N.

Mech Dev. 1998 Jul;75(1-2):139-43.

PMID:
9739128
[PubMed - indexed for MEDLINE]

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