<p><em><span style=\"font-family: \'Times New Roman\',\'serif\'; font-size: 10pt; mso-ansi-language: EN-PH; mso-fareast-font-family: \'Times New Roman\';\" lang=\"EN-PH\">A study on sexual dimorphism of Sundathelphusa philippina was conducted using geometric morphometric methods. Sundathelphusa philippina, locally known as &lsquo;kagang&rsquo;, is a crab species found in the freshwaters of Lake Sebu specifically in the Seven Falls, which is the outlet of the lake&rsquo;s water. It is a rarely-studied species with only a few, and close to none, literature available, which pushed the researchers to pursue the study on this species. 73 (male=39, female=34) samples which were acquired from Seven Falls, Lake Sebu were subjected to geometric morphometric analysis. The pattern of the crab&rsquo;s dorsal carapace was quantified and analysed using Relative Warp Analysis (Rohlf, 2008) which revealed differences in the anterolateral teeth, and posterolateral regions. Statistical analyses of scores were done using Canonical Variance Analysis (CVA), Principal Component Analysis (PCA), and Discriminant Function Analysis (DFA) of the PAST software (Hammer et al., 2009) revealing concurrent significant results. MANOVA unveiled that the crabs are sexually dimorphic with a Wilk&rsquo;s lambda of 0.07613, a Pillai trace of 0.2387, and a P-Value of 0.002284. Thus, the male and female S. philippina are significantly sexually dimorphic due to sexual roles during reproduction: the females being the carrier of the eggs, and the males being the defenders against predators or other male crabs. </span></em></p>
<p><span style=\"font-family: \'Times New Roman\',\'serif\'; font-size: 10pt; mso-ansi-language: EN-PH; mso-fareast-font-family: \'Times New Roman\';\" lang=\"EN-PH\">Keywords: <em>Sundathelphusa philippina,</em> Geometric Morphometrics, Sexual Dimorphism, CVA, PCA, DFA</span></p>
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