A morphological comparison of Holospira Monclovana and Holospira Picta (Gastropoda: Urocoptidae) using x-ray computed tomography

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Title: A morphological comparison of Holospira Monclovana and Holospira Picta (Gastropoda: Urocoptidae) using x-ray computed tomography
Author: Rilling, Rigel
Abstract: This study was undertaken to re -evaluate the taxonomic placement of two species of xeric -adapted holospirids from near Monclova , Coahuila , Mexico using techniques unavailable to researchers at the time of the original descriptions of these species . X -ray computed tomography was used to scan the complete series of Holospira monclovana (n=24 , including holotype ) and of Holospira picta (n=27 , including holotype ) , as well as 26 of another series of specimens (assigned to Holospira picta by the original author ) from approximately 35 km southeast of Monclova . The program ImageJ was used to analyze Xray CT scans of all specimens . Analyses of Similarities (ANOSIM ) were conducted using the statistical suite R to compare the three populations , both pairwise and all together (Null hypothesis : R≈0 ; dissimilarities within groups ≥ dissimilarities between groups ) . Analysis shows all three populations to be statistically distinct (R=0 .398 , p <0 .001 ) , supports the retention of H . monclovana within subgenus Holospira , and supports reassignment of both populations of H . picta to the subgenus Bostrichocentrum .
URI: http : / /hdl .handle .net /2346 .1 /30007
Date: 2012-05-12

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Rilling, Rigel A morphological comparison of Holospira Monclovana and Holospira Picta (Gastropoda: Urocoptidae) using x-ray computed tomography. Master's thesis, Angelo State University. Available electronically from http : / /hdl .handle .net /2346 .1 /30007 .

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