Functional Morphology of Digestion in the Stomachless, Piscivorous Needlefishes Tylosurus gavialoides and Strongylura leiura ferox (Teleostei: Beloniformes)

Manjakasy, JM, Day, RD, Kemp, A and Tibbetts, IR (2009) Functional Morphology of Digestion in the Stomachless, Piscivorous Needlefishes Tylosurus gavialoides and Strongylura leiura ferox (Teleostei: Beloniformes). Journal of Morphology, 270 10: 1155-1165. doi:10.1002/jmor.10745


Author Manjakasy, JM
Day, RD
Kemp, A
Tibbetts, IR
Title Functional Morphology of Digestion in the Stomachless, Piscivorous Needlefishes Tylosurus gavialoides and Strongylura leiura ferox (Teleostei: Beloniformes)
Formatted title
Functional Morphology of Digestion in the Stomachless, Piscivorous Needlefishes Tylosurus gavialoides and Strongylura leiura ferox (Teleostei: Beloniformes)
Journal name Journal of Morphology   Check publisher's open access policy
ISSN 0362-2525
Publication date 2009-04-01
Year available 2009
Sub-type Article (original research)
DOI 10.1002/jmor.10745
Volume 270
Issue 10
Start page 1155
End page 1165
Total pages 11
Editor J Matthias Starck
Place of publication USA
Publisher John Wiley & Sons, Inc.
Language eng
Subject C1
970106 Expanding Knowledge in the Biological Sciences
060807 Animal Structure and Function
Formatted abstract
Belonidae are unusual in that they are
carnivorous but lack a stomach and have a straight,
short gut. To develop a functional morphological model
for this unusual system the gut contents and alimentary
tract morphology of Tylosurus gavialoides and Strongylura
leiura ferox
were investigated. The posterior orientation
of the majority of the pharyngeal teeth supports
the swallowing of whole large prey, but not their mastication.
Mucogenic cells are abundant in the mucosa lining,
particularly the esophagus, and their secretions are
likely to protect the gut lining from damage while lubricating
passage of the prey. Esophagus, anterior intestine,
posterior intestine, and rectum all have highly reticulate
mucosae. The anterior three gut sections are
distensible to accommodate the passage of prey. However,
following ingestion large prey are passed to the
highly distensible posterior intestine where they rest
head first against the ileorectal valve. Alimentary pH
ranges from neutral to weakly acidic. Fish prey is
digested head first with the head being largely digested
while the remainder of the body is still intact. The nondistensibility
of the rectum and the small aperture provided
by the ileorectal valve suggest the products of intestinal
digestion are either small particulates or fluids that
pass into rectum where they are absorbed.
Keyword stomach
carnivory
digestion
gut morphology
pharyngeal jaw apparatus
ARRHAMPHUS-SCLEROLEPIS-KREFFTII
PHARYNGEAL JAW APPARATUS
MUCOUS GLYCOPROTEINS
CHEMICAL REACTORS
COMMON CARP
FISH
GUT
ATHERINOPSIDAE
VERTEBRATES
ABSORPTION
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Thu, 12 Nov 2009, 22:01:56 EST by Mr Andrew Martlew on behalf of Centre for Marine Studies