Results 181 to 190 of about 2,793 (216)
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Digestive Systems: Holothuroidea*
2020This chapter describes the structure of the holothuroid gut and the associated hemal system since the work of Bohadsch on Holothuria tubulosa. Most of the 19th century works were reported in Ludwig. To facilitate the description we will consider no more than three types of 'digestive' coelomocytes: small coelomocytes, 'phagocytes' and granulocytes ...
Jean-Pierre Feral, Claude Massin
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Notes for a Short Course: Studies in Geology, 1980
Among the living echinoderms, holothurians are generally regarded as “poor relations” of the other groups. The color and symmetry of sea-stars and the complexity of echinoids usually elicit expressions of admiration from casual observers; the reactions to holothurians usually involves a considerable degree of revulsion.
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Among the living echinoderms, holothurians are generally regarded as “poor relations” of the other groups. The color and symmetry of sea-stars and the complexity of echinoids usually elicit expressions of admiration from casual observers; the reactions to holothurians usually involves a considerable degree of revulsion.
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Holothurians (Echinodermata: Holothuroidea)
2021A total of 213 holothurians, representing 16 species, was collected during Project Hourglass, a28-month systematic survey of ten stations along two transects (6-73 m) off central western Florida.This material, supplemented with 8 1 additional Gulf of Mexico specimens supplied by the FloridaDepartment of Natural Resources, brings the total number of ...
Miller, John E., Pawson, David L.
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2018
The holothurian paraspecies Achistrum brevis Mostler, 1971 from the Norian of Hernstein (Lower Austria), is a junior homonym of Achistrum brevis Gutschick, 1959. A. brevis Gutschick, 1959 is a significant element in the Lower Mississippian of northern Indiana, USA (Gutschick, 1959, 132).
Mostler, H., Reich, M.
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The holothurian paraspecies Achistrum brevis Mostler, 1971 from the Norian of Hernstein (Lower Austria), is a junior homonym of Achistrum brevis Gutschick, 1959. A. brevis Gutschick, 1959 is a significant element in the Lower Mississippian of northern Indiana, USA (Gutschick, 1959, 132).
Mostler, H., Reich, M.
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The buccal tentacles of Holothuria forskali D.Chiaje (Echinodermata: Holothuroidea)
2020info:eu-repo/semantics ...
Bouland, Catherine +2 more
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Sea cucumbers symmetry (Echinodermata: Holothuroidea)
Paleontological Journal, 2014The types of symmetry that are characteristic for the class Holothuroidea and reflect different stages in the evolution of this group of echinoderms and the role of paedomorphosis in its origin are analyzed. A hypothesis is proposed to explain the distinctive structure of the water vessel (ambulacral) system of sea cucumbers and the origin of the class
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Paedomorphosis and heterochrony in the origin and evolution of the class holothuroidea
Paleontological Journal, 2015The role of paedomorphosis as a particular case of heterochrony in the origin and evolution of the class Holothuroidea is analyzed. It is shown that holothurians are characterized by the presence of some paedomorphic characters (reduced skeleton, absence of an axial complex in the shape of a morphologically integrated structure, single gonad with one ...
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