+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Trends in clade-level morphology A geometric morphometric study of the Naticidae

Trends in clade-level morphology A geometric morphometric study of the Naticidae

American Zoologist 41(6): 1382

Naticidae is a taxonomically diverse clade of marine caenogastropods that is notoriously conservative in shell morphology. Ten taxa from four clades were examined using geometric morphometrics. Thirteen landmarks were identified in apertural view, with the coiling axis used as a baseline. All taxa were found to be significantly different from each other in pairwise comparisions of Bookstein coordinates using Hotelling's T2 test. Within-species variance was higher in taxa with wider, more inflated apertures. These taxa also partially internalize their shells and some have completely lost the ability to retract into the shell. Shell internalization, therefore, may put greater soft-tissue pressure on the growing edge of the shell, leading to erratic deformation. Principle components analysis deformation vectors mapped onto a well-supported phylogenetic hypothesis revealed repeated trends in the more speciose clades examined. A clade including species of the genus Natica and a Polinices-dominated clade both contain basal taxa with laterally-contracted apertures and high-spired shells. Crownward progression in each clade leads to a lateral expansion of the aperture and a general widening and shortening of the shell. However, this shell shortening is accomplished through different growth mechanisms. The repetition of this general trend suggests the possibility of an underlying functional cause. Increased mobility associated with a wider aperture is one good candidate for future experimental testing.

(PDF emailed within 1 workday: $29.90)

Accession: 035985269

Download citation: RISBibTeXText

Related references

Morphological effect of terrestriality in the clade Testudinoidea A geometric morphometric approach. Journal of Morphology 248(3): 218, 2001

How plastic is vendobionta morphology? A geometric morphometric study of two groups of Pteridinium from the latest Neoproterozoic. Geological Society of America 41.7, 2009

Morphometric study of two species of wood mice Apodemus sylvaticus and A. flavicollis (Rodentia: Muridae): traditional and geometric morphometric approach. Acta Theriologica uary; 51(1): 15-27, 2006

Mandibular morphology as an indicator of human subadult age: geometric morphometric approaches. Forensic Science, Medicine, and Pathology 4(2): 91-99, 2009

Geometric morphometric analysis of palatal morphology in extant and fossil hominoids. American Journal of Physical Anthropology Supplement (36): 150, 2003

Functional morphology and integration of corvid skulls - a 3D geometric morphometric approach. Frontiers in Zoology 6: 2, 2009

Hominin lower second premolar morphology: evolutionary inferences through geometric morphometric analysis. Journal of Human Evolution 50(5): 523-533, 2006

A new Middle Miocene tarsier from Thailand and the reconstruction of its orbital morphology using a geometric-morphometric method. Proceedings. Biological Sciences 278(1714): 1956-1963, 2011

Geometric morphometric analysis of the palatal morphology in children with impacted incisors: A three-dimensional evaluation. Angle Orthodontist 87(3): 404-408, 2016

A proposed method for the identification of race in sub-adult skeletons: a geometric morphometric analysis of mandibular morphology. Journal of Forensic Sciences 49(6): 1159-1164, 2004

Bat Species Comparisons Based on External Morphology: A Test of Traditional versus Geometric Morphometric Approaches. Plos One 10(5): E0127043, 2016

Three-dimensional geometric morphometric analysis of talar morphology in extant gorilla taxa from highland and lowland habitats. Anatomical Record 298(1): 277-290, 2015

Significance of hind wing morphology in distinguishing genera and species of cantharid beetles with a geometric morphometric analysis. Zookeys 2015(502): 11-25, 2015

Geometric morphometric analysis of the crown morphology of the lower first premolar of hominins, with special attention to Pleistocene Homo. Journal of Human Evolution 55(4): 627-638, 2008

Geometric morphometric analysis of allometric variation in the mandibular morphology of the hominids of Atapuerca, Sima de los Huesos site. Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology 278(2): 551-560, 2004