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Description of the glochidia of Alathyria pertexta pertexta Iredale, 1934 (Bivalvia:Hyriidae) from south-eastern Queensland

Description of the glochidia of Alathyria pertexta pertexta Iredale, 1934 (Bivalvia:Hyriidae)... Most freshwater mussels (Bivalvia: Unionida) have larvae (glochidia in Margaritiferidae, Hyriidae and Unionidae) that are parasitic on fishes. Mechanisms of glochidia release and morphological features (size, shape, larval teeth, etc.) vary across taxa and geography. Among the Australasian Hyriidae, glochidia have been described from 12 of the 28 putative species. Alathyria pertexta Iredale, 1934 is a widespread species from subtropical/semitemperate south-eastern Queensland and northern New South Wales to the northern wet tropics of Queensland and southern New Guinea. Little information is available on its biology and its glochidia have not been described in detail. The aim of this study was to describe the glochidia of A. pertexta pertexta and the method of their release. Gravid females collected from Mary River, near Kenilworth, and Isaac River, north-west of Rockhampton, Queensland, released glochidia in amorphous mucus conglutinates, in which glochidia are released from exhalent siphons of females in a loose mucus matrix that dissociates in water, during the austral spring (AugustOctober) they then hatched from vitelline membranes but remained tethered by a larval thread and began characteristically winking. Shells (n = 80) are subtriangular and scalene in shape, 268.1 m long (1.21, s.e.), 242.9 m high (1.22, s.e.) and have a hinge length of 191 m (0.63, s.e.). Larval teeth are spineless, S-shaped hooks with singular interlocking cusps on opposing valves. The surface of the apex and valve margins are crenulated, and valves are smooth and porous, held together by a hinge and a singular internal adductor muscle. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Journal of Zoology CSIRO Publishing

Description of the glochidia of Alathyria pertexta pertexta Iredale, 1934 (Bivalvia:Hyriidae) from south-eastern Queensland

Australian Journal of Zoology , Volume 67 (1): 8 – Jan 15, 2020

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Publisher
CSIRO Publishing
Copyright
Copyright © American Meteorological Society
ISSN
0004-959X
eISSN
1446-5698
DOI
10.1071/ZO19056
Publisher site
See Article on Publisher Site

Abstract

Most freshwater mussels (Bivalvia: Unionida) have larvae (glochidia in Margaritiferidae, Hyriidae and Unionidae) that are parasitic on fishes. Mechanisms of glochidia release and morphological features (size, shape, larval teeth, etc.) vary across taxa and geography. Among the Australasian Hyriidae, glochidia have been described from 12 of the 28 putative species. Alathyria pertexta Iredale, 1934 is a widespread species from subtropical/semitemperate south-eastern Queensland and northern New South Wales to the northern wet tropics of Queensland and southern New Guinea. Little information is available on its biology and its glochidia have not been described in detail. The aim of this study was to describe the glochidia of A. pertexta pertexta and the method of their release. Gravid females collected from Mary River, near Kenilworth, and Isaac River, north-west of Rockhampton, Queensland, released glochidia in amorphous mucus conglutinates, in which glochidia are released from exhalent siphons of females in a loose mucus matrix that dissociates in water, during the austral spring (AugustOctober) they then hatched from vitelline membranes but remained tethered by a larval thread and began characteristically winking. Shells (n = 80) are subtriangular and scalene in shape, 268.1 m long (1.21, s.e.), 242.9 m high (1.22, s.e.) and have a hinge length of 191 m (0.63, s.e.). Larval teeth are spineless, S-shaped hooks with singular interlocking cusps on opposing valves. The surface of the apex and valve margins are crenulated, and valves are smooth and porous, held together by a hinge and a singular internal adductor muscle.

Journal

Australian Journal of ZoologyCSIRO Publishing

Published: Jan 15, 2020

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