scholarly journals Predator-induced plasticity in egg capsule deposition in the mud snail Tritia obsoleta

2018 ◽  
Vol 586 ◽  
pp. 113-125
Author(s):  
EA Harmon ◽  
JD Allen
Keyword(s):  
Mud Snail ◽  
Egg Capsule

A new species of the genus Parapachymorpha Brunner von Wattenwyl, 1893 (Phasmida, Phasmatidae, Clitumninae) from Laos

Zootaxa ◽  
2020 ◽  
Vol 4732 (1) ◽  
pp. 196-200
Author(s):  
CHANG-MOON JANG ◽  
YANG˗SEOP BAE
Keyword(s):  
New Species ◽  
Body Surface ◽  
Type Species ◽  
Lateral View ◽  
Lower Margin ◽  
Additional Species ◽  
The World ◽  
A New Species ◽  
Egg Capsule

Parapachymorpha is one of eight genera within the tribe Medaurini of subfamily Clitumninae (Phasmatidae). It was established by Brunner von Wattenwyl (1893), with the type species Parapachymorpha nigra by subsequent designation of Kirby (1904), from Myanmar. Species of this genus are widely distributed in oriental tropics (Laos, China, Thailand, Myanmar, Vietnam and Cambodia), with only 11 known species in the world (Brock et al. 2018, Ho 2017). Species of the genus Parapachymorpha can be recognized by following characters (Brunner von Wattenwyl 1893;1907, Henmemann & Conle 2008, Ho 2017): 1) body robust in female and slender in male with long leg in relation to the length; 2) body surface of female granulose or spinose; 3) mesonotum of female more and less expanded posteriorly; 4) abdominal tergites lacking expanded prostero–lateral angles in both sexes; 5) laminal supraanalis undeveloped in female; 6) semi–tergite of male irregularly rectangular, with an additional finger­–like ventro–apical appendix on the lower margin and reduced or absent; 7) egg capsule oval to oblong and covered with a raised net–like structure in lateral view; 8) micropylar plate oval; 9) operculum concave or convex. In the present study, we describe additional species, Parapachymorpha minuta sp. nov. from Laos, with photographs of both sexes of adults and egg. 

Predation of the shelduck Tadorna tadorna on the mud snail Hydrobia ulvae

2008 ◽  
Vol 43 (4) ◽  
pp. 1193-1199 ◽  
Author(s):  
N. R. Anders ◽  
T. Churchyard ◽  
J. G. Hiddink
Keyword(s):  
Hydrobia Ulvae ◽  
Mud Snail

Three sulphated polysaccharides isolated from the mucilage of mud snail, Bullacta exarata philippi: Characterization and antitumour activity

2013 ◽  
Vol 138 (1) ◽  
pp. 306-314 ◽  
Author(s):  
Daihui Zhang ◽  
Chong Wang ◽  
Hongxi Wu ◽  
Jingli Xie ◽  
Lei Du ◽  
...  
Keyword(s):  
Antitumour Activity ◽  
Sulphated Polysaccharides ◽  
Mud Snail ◽  
Bullacta Exarata

Developmental stages in the Digenea

Parasitology ◽  
1964 ◽  
Vol 54 (2) ◽  
pp. 295-312 ◽  
Author(s):  
Elon E. Byrd ◽  
William P. Maples
Keyword(s):  
Body Wall ◽  
Developmental Stages ◽  
Snail Host ◽  
The Body ◽  
Body Movements ◽  
Hatching Enzyme ◽  
Apical Papilla ◽  
Short Time ◽  
Membranous Body ◽  
Egg Capsule

The naturally oviposited egg of Dasymetra conferta is fully embryonated and it hatches only after it is ingested by the snail host, Physa spp.Hatching appears to be in response to some stimulus supplied by the living snail. The stimulus causes the larva to exercise a characteristic series of body movements and to liberate a granular sustance (hatching enzyme) from the larger pair of its cephalic glands. This enzyme reacts with the vitelline fluid to create pressure within the egg capsule, and with the cementum of the operculum, so that it may be lifted away. The larva's escape from the shell, therefore, is due to a combination of pressure and body movements.The hatched larva has a membranous body wall, supporting six epidermal plates, an apical papilla, two penetration glands and a central matrix (the presumptive brood mass).It lives for about an hour within the snail and during this time there is a reorganization of the central matrix which terminates in the formation of an 8-nucleated syncytial brood mass.The miracidial ‘case’, consisting of the body wall and the epidermal plates, ultimately ruptures to liberate the brood mass. Once the brood mass is free it penetrates through the gut wall in an incredibly short time.

scholarly journals Egg-capsule deposition of the marine gastropodOlivella minuta: the importance of an interspecific relationship with the soft-bottom bivalveTivela mactroides

2018 ◽  
Vol 85 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Guilherme N Corte ◽  
Leonardo Q Yokoyama ◽  
Márcia R Denadai ◽  
Eduardo Bessa ◽  
Maria Claudia Z Salles ◽  
...  
Keyword(s):  
Interspecific Relationship ◽  
Soft Bottom ◽  
Egg Capsule

Measurement of ingestion rate of Hydrobia ulvae (Pennant) on intertidal epipelic microalgae: the effect of mud snail density

2000 ◽  
Vol 255 (2) ◽  
pp. 247-260 ◽  
Author(s):  
Gérard F Blanchard ◽  
Jean-Marc Guarini ◽  
Laurent Provot ◽  
Pierre Richard ◽  
Pierre-Guy Sauriau
Keyword(s):  
Ingestion Rate ◽  
Snail Density ◽  
Hydrobia Ulvae ◽  
Mud Snail

scholarly journals Egg capsule architecture and siting in a leaf-curling sac spider, Clubiona riparia (Araneae: Clubionidae)

2011 ◽  
Vol 39 (1) ◽  
pp. 76-83
Author(s):  
Robert B. Suter ◽  
Patricia R. Miller ◽  
Gail E. Stratton
Keyword(s):  
Leaf Curling ◽  
Egg Capsule
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