Shell Color Allelic Lines of Rapana venos (VALENCIENNES, 1846)

2012 ◽  
Author(s):  
Igor P. Bondarev
Keyword(s):  
Shell Color

scholarly journals The draft genome sequence of the grove snail Cepaea nemoralis

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Suzanne V Saenko ◽  
Dick S J Groenenberg ◽  
Angus Davison ◽  
Menno Schilthuizen
Keyword(s):  
Genome Sequence ◽  
Draft Genome ◽  
Agricultural Pests ◽  
Shell Color ◽  
Protein Coding ◽  
Cepaea Nemoralis ◽  
Edible Species ◽  
Wide Range ◽  
In Captivity ◽  
Long Read

Abstract Studies on the shell color and banding polymorphism of the grove snail Cepaea nemoralis and the sister taxon Cepaea hortensis have provided compelling evidence for the fundamental role of natural selection in promoting and maintaining intraspecific variation. More recently, Cepaea has been the focus of citizen science projects on shell color evolution in relation to climate change and urbanization. C. nemoralis is particularly useful for studies on the genetics of shell polymorphism and the evolution of “supergenes,” as well as evo-devo studies of shell biomineralization, because it is relatively easily maintained in captivity. However, an absence of genomic resources for C. nemoralis has generally hindered detailed genetic and molecular investigations. We therefore generated ∼23× coverage long-read data for the ∼3.5 Gb genome, and produced a draft assembly composed of 28,537 contigs with the N50 length of 333 kb. Genome completeness, estimated by BUSCO using the metazoa dataset, was 91%. Repetitive regions cover over 77% of the genome. A total of 43,519 protein-coding genes were predicted in the assembled genome, and 97.3% of these were functionally annotated from either sequence homology or protein signature searches. This first assembled and annotated genome sequence for a helicoid snail, a large group that includes edible species, agricultural pests, and parasite hosts, will be a core resource for identifying the loci that determine the shell polymorphism, as well as in a wide range of analyses in evolutionary and developmental biology, and snail biology in general.

scholarly journals A new species of Arene (Vetigastropoda, Areneidae) from Canopus Bank, off NE Brazil

2018 ◽  
Vol 58 ◽  
pp. 23
Author(s):  
Daniel Caracanhas Cavallari ◽  
Luiz Ricardo Lopes de Simone
Keyword(s):  
New Species ◽  
Large Scale ◽  
Shell Morphology ◽  
Shell Color ◽  
A New Species ◽  
Axial Growth

Arene lychee sp. nov. is described from Canopus Bank, a seamount located ~190 km off Fortaleza, Ceará, NE Brazil (02°14’25”S, 38°22’50”W), based on shell morphology. The species is characterized by a large, trochiform shell; color ranging from intense reddish to white (darker on spiral cords, lighter at base) with a yellow apex; sculpture of 3‑8 wide spiral cords with large scale-like spines; cords separated by deep interspaces with similar width, and interspaces sculptured by closely-packed, thin axial growth lines.

scholarly journals Mate Choice Contributes to the Maintenance of Shell Color Polymorphism in a Marine Snail via Frequency-Dependent Sexual Selection

2020 ◽  
Vol 7 ◽  
Author(s):  
Daniel Estévez ◽  
Eugene Kozminsky ◽  
Antonio Carvajal-Rodríguez ◽  
Armando Caballero ◽  
Rui Faria ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Mate Choice ◽  
Color Polymorphism ◽  
Snail Species ◽  
Effective Population ◽  
Evolutionary Mechanisms ◽  
Shell Color ◽  
Frequency Dependent ◽  
Ideal System ◽  
Frequency Changes

Natural color polymorphisms are widespread across animal species and usually have a simple genetic basis. This makes them an ideal system to study the evolutionary mechanisms responsible for maintaining biodiversity. In some populations of the intertidal snail Littorina fabalis, variation in shell color has remained stable for years, but the mechanisms responsible are unknown. Previous studies suggest that this stability could be caused by frequency-dependent sexual selection, but this hypothesis has not been tested. We analyzed shell color polymorphism in mating pairs and surrounding unmated individuals in two different populations of L. fabalis to estimate sexual fitness for color, as well as assortative mating. The estimated effective population size from neutral markers allowed us to disregard genetic drift as the main source of color frequency changes across generations. Shell color frequency was significantly correlated with sexual fitness showing a pattern of negative frequency dependent selection with high disassortative mating for color. The results suggested a contribution of male mate choice to maintain the polymorphism. Finally, the implementation of a multi-model inference approach based on information theory allowed us to test for the relative contribution of mate choice and mate competition to explain the maintenance of color polymorphism in this snail species.

scholarly journals The Influence of Rate of Production and Temperature on Egg Shell Color

1951 ◽  
Vol 30 (6) ◽  
pp. 815-817
Author(s):  
T.G. Culton ◽  
D.W. MacLaury ◽  
W.M. Insko
Keyword(s):  
Shell Color ◽  
Egg Shell

How to Make a Mimic? Brood Parasitic Striped Cuckoo Eggs Match Host Shell Color but Not Pigment Concentrations

2018 ◽  
Vol 44 (10) ◽  
pp. 940-946 ◽  
Author(s):  
Miri Dainson ◽  
Melissa Mark ◽  
Marouf Hossain ◽  
Barney Yoo ◽  
Mande Holford ◽  
...  
Keyword(s):  
Shell Color ◽  
Pigment Concentrations

QTL mapping for orange shell color and sex in the Pacific oyster (Crassostrea gigas)

Aquaculture ◽  
2021 ◽  
Vol 530 ◽  
pp. 735781
Author(s):  
Ziqiang Han ◽  
Qi Li ◽  
Chengxun Xu ◽  
Shikai Liu ◽  
Hong Yu ◽  
...  
Keyword(s):  
Qtl Mapping ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Shell Color ◽  
The Pacific

scholarly journals Transcriptome analysis reveals the pigmentation related genes in four different shell color strains of the Manila clam Ruditapes philippinarum

Genomics ◽  
2020 ◽  
Vol 112 (2) ◽  
pp. 2011-2020 ◽  
Author(s):  
Hongtao Nie ◽  
Kunyin Jiang ◽  
Liwen Jiang ◽  
Zhongming Huo ◽  
Jianfeng Ding ◽  
...  
Keyword(s):  
Transcriptome Analysis ◽  
Ruditapes Philippinarum ◽  
Manila Clam ◽  
Shell Color ◽  
Color Strains
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