The use of pelvic fins for benthic locomotion during foraging behavior in Potamotrygon motoro (Chondrichthyes: Potamotrygonidae)

Morphological abnormalities in the Chilean Eagle ray Myliobatis chilensis (Myliobatiformes: Myliobatidae) off the Peruvian coast, Southeast Pacific

“…The limited opening of the 昀椀fth-gill slits could follow from the adjacent 昀椀n malformation. The 昀椀n lobes may have independent movement because of the apparent fusion of the pectoral radials near the edges of the 昀椀ns called "crurae" (Figure 2c), which move independently of the striped pelvic and pectoral 昀椀ns (Shibuya et al, 2015). Of the three anomalies, the second one (PESY-010201) -lack of fusion between head and 昀椀nsis the most frequent (Table 3).…”

Notes on the occurrence and gender-based morphological aspects of Potamotrygon motoro (Elasmobranchii: Potamotrygonidae) in the complex of the Viana lake system- Maranhão, Brazil

“…The hydrodynamic contribution of the pelvic fin should also be considered, as it plays an important mechanical function (Raff 2012). Briefly, the pelvic fins compensate for the rippling of the pectoral fins by propelling the body against the substrate, performing synchronized ambipedal maneuvers and prey capture movements (Shibuya et al 2015). Thus, it is possible that the increase in pelvic fin width in females may occur due to the need to optimize swimming movements as a way to compensate for the larger dimensions of its disc (Macesic et al 2013).…”

Morphology and phylogenetic significance of the pelvic articular region in elasmobranchs (Chondrichthyes)

“…In the last three decades morphological phylogenetic studies addressing the elasmobranchs mostly lack detailed descriptions and proposition of characters focusing on the skeletal structures of the paired fins (Nishida, 1990; Shirai, 1992a, b; Carvalho, 1996; Lovejoy, 1996; McEachran et al., 1996; Goto, 2001; McEachran and Aschliman, 2004; Aschliman et al., 2012a; Claeson, 2014; Stone and Shimada, 2019). The pelvic girdle is clearly an underexplored morphological complex in a phylogenetic context, especially the pelvic articular region and the arrangement and number of foramina present, even though multiple studies involving its morphological and functional aspects (Daniel, 1934; Gilbert and Heath, 1972; Compagno, 1988, 1999; Shirai and Okamura, 1992; Goto et al., 1999; Lucifora and Vassalo, 2002; Macesic and Kajiura, 2010; Macesic and Summers, 2012; Maia et al., 2012; Macesic et al., 2013; Ekstrom and Kajiura, 2014; Shibuya et al., 2015; Trinajstic et al., 2015; Silva and Casas, 2020; Silva and Vaz, 2021) or its origin (Thatcher, 1877; Gegenbaur, 1878; Mivart, 1879; Balfour, 1881; Freitas et al., 2006; Cole and Currie, 2007; Dahn et al., 2007; Johanson, 2010; Nakamura et al., 2015; Onimaru et al., 2015; Gillis and Hall, 2016; Tulenko et al., 2016, 2017; Sleight and Gillis, 2020) are available across literature. Detailed descriptions of the pelvic girdle, when present, are often in conjunction with taxonomic works that do not propose morphological characters in a broader phylogenetic context (McEachran and Compagno, 1979; Dingerkus and Defino, 1983; Stehmann and Séret, 1983; Miyake, 1988; Séret, 1989; Compagno and Heemstra, 2007; Silva and Carvalho, 2011<...…”