| Title |
Relative Warp and Correlation Analysis based on Distances of the Morphological shell shape patterns among freshwater gastropods (Thiaridae: Cerithimorpha) |
|
Authors |
Carlo Stephen O. Moneva, Mark Anthony J. Torres, Cesar G. Demayo |
|
Publication date |
2012/6/19 |
|
Journal |
Aquaculture, Aquarium, Conservation & Legislation BIOFLUX |
| Volume |
5 |
| Issue |
3 |
| Pages |
124-135 |
| Publisher |
International Journal of the Bioflux Society |
| Abstract |
Shell morphology has various details in their architecture that contributes effectively to
gastropod identification and classification. A conventional approach has been made to study shell
morphology using descriptions of biological shapes. However, descriptions can be strengthened by
applying additional quantitative tools. Relative Warp Analysis and Correlation Analysis based on
Distances (CORIANDIS) were used to determine shell shape divergence and ascertain factors
associated with the shell shape variation in three species of the genus Melanoides of the family
Thiaridae namely, Melanoides granifera, Melanoides maculata, and unknown Melanoides species
belonging to the family Thiaridae. Relative warp summarizes the vectors of shape variation within
samples. CORIANDIS on the other hand, examines similarities among samples and interpreted in
terms of congruence among traits. Results of the relative warp analysis showed significant shell
shape variation among the Thiaridae species in the height of the spire, aperture, and apical shapes.
Distance matrices were also constructed for the three data sets of shell characters: ventral/aperture,
dorsal, and top/whorl shell. Results of the comparison via correlation analyses of distances among the
species showed that an unknown Melanoides species is closely related to M. maculata than M.
granifera. The results of the present study clearly show the importance of geometric morphometric
analysis determination of systematic relationship in Thiarid snails. |
| Index terms / Keywords |
Relative Warp Analysis, CORIANDIS, shell shape, Thiaridae, shell characters. |
| URL |
|
Mindanao State
University - Iligan Institute of Technology