Spontaneous hatching of Fallacohospes inchoatus,an umagillid flatworm from the northeastern Pacific crinoid Florometra serratissima

Member of
HBOI Faculty Contributions
Contributors
Shinn, G. L.
Publisher
NRC Research Press.
Date Issued
1986
Note

Egg capsules of Fallacophospes inchoatus are roughly tetrahedral in shape, have a hydratable adhesive covering, and typically
contain two zygotes and 40-50 yolk cells. Embryos complete development in 40-42 days and hatch spontaneously when kept in
seawater at 8-10° C. This observation suggests that the suspension-feeding crinoid hosts are infected by eating free-swimming
larvae rather than by eating egg capsules that contain embryos, which is the case for deposit-feeding echinoderms that harbour
umagillids. The possibility is raised that umagillids originally evolved as parasites of suspension-feeding echinoderms and that
the mode of reproduction of crinoid-inhabiting umagillids is primitive for the family.

Language
English
Type
Text
Genre
article
Form
pdf
Extent
5 p.
Subject (Topical)
Flatworms
Turbellaria
Crinoidea
Endosymbiosis
Egg capsules
Hatching of eggs
Identifier
FA00007176
Additional Information
Egg capsules of Fallacophospes inchoatus are roughly tetrahedral in shape, have a hydratable adhesive covering, and typically
contain two zygotes and 40-50 yolk cells. Embryos complete development in 40-42 days and hatch spontaneously when kept in
seawater at 8-10° C. This observation suggests that the suspension-feeding crinoid hosts are infected by eating free-swimming
larvae rather than by eating egg capsules that contain embryos, which is the case for deposit-feeding echinoderms that harbour
umagillids. The possibility is raised that umagillids originally evolved as parasites of suspension-feeding echinoderms and that
the mode of reproduction of crinoid-inhabiting umagillids is primitive for the family.
Florida Atlantic University. Harbor Branch Oceanographic Institute contribution 496
This manuscript is an author version with the final publication
available and may be cited as: Shinn, G. L. (1986). Spontaneous hatching of Fallacohospes inchoatus,
an umagillid flatworm from the northeastern Pacific crinoid Florometra serratissima. Canadian
Journal of Zoology, 64(9), 2068-2071. doi: 10.1139/z86-314
Date Backup
1986
Date Text
1986
DOI
10.1139/z86-314
Date Issued (EDTF)
1986
Extension


FAU

IID
FA00007176
Organizations
Attributed name: Harbor Branch Oceanographic Institute
Person Preferred Name

Shinn, G. L.
Physical Description

pdf
5 p.
PURL
http://purl.flvc.org/fau/fd/FA00007176
Title Plain
Spontaneous hatching of Fallacohospes inchoatus,an umagillid flatworm from the northeastern Pacific crinoid Florometra serratissima
URL
http://dx.doi.org/10.1139/z86-314
Origin Information

1986
NRC Research Press.

Ottawa

Place

Ottawa
Title
Spontaneous hatching of Fallacohospes inchoatus,an umagillid flatworm from the northeastern Pacific crinoid Florometra serratissima
Other Title Info

Spontaneous hatching of Fallacohospes inchoatus,an umagillid flatworm from the northeastern Pacific crinoid Florometra serratissima