1978
DOI: 10.2307/1443685
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Interrelationships and Subgeneric Classification of Raja erinacea and R. ocellata Based on Claspers, Neurocrania and Pelvic Girdles (Pisces: Rajidae)

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Cited by 8 publications
(7 citation statements)
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“…In the case of L. erinacea, the apparent abundance increase since 1970 could be artifactual due to misidentification issues, a hypothesis supported by both (1) the marked increase in mean number of L. erinacea per tow in the late 1970s (mature) and late 1980s (immature) coincident with improved identification techniques (McEachran & Musick, 1973) and (2) the great variability in L. erinacea adult abundance from year to year. Although identification issues are usually most applicable to immature skates <300 mm L T (McEachran & Musick, 1973;Alvarado Bremer et al, 2005), there are also many morphometric similarities between L. ocellata and L. erinacea of larger sizes (McEachran & Martin, 1978), making classification of the smaller L. erinacea potentially difficult for inexperienced observers. Alternately, an increase in L. erinacea abundance on the ESS could be partly due to competitive release, a theory used previously to explain increases in smaller skate species such as R. radiata Donovan in the North Sea (Walker & Heesen, 1996) following the removal of larger skates .…”
Section: Discussionmentioning
confidence: 99%
“…In the case of L. erinacea, the apparent abundance increase since 1970 could be artifactual due to misidentification issues, a hypothesis supported by both (1) the marked increase in mean number of L. erinacea per tow in the late 1970s (mature) and late 1980s (immature) coincident with improved identification techniques (McEachran & Musick, 1973) and (2) the great variability in L. erinacea adult abundance from year to year. Although identification issues are usually most applicable to immature skates <300 mm L T (McEachran & Musick, 1973;Alvarado Bremer et al, 2005), there are also many morphometric similarities between L. ocellata and L. erinacea of larger sizes (McEachran & Martin, 1978), making classification of the smaller L. erinacea potentially difficult for inexperienced observers. Alternately, an increase in L. erinacea abundance on the ESS could be partly due to competitive release, a theory used previously to explain increases in smaller skate species such as R. radiata Donovan in the North Sea (Walker & Heesen, 1996) following the removal of larger skates .…”
Section: Discussionmentioning
confidence: 99%
“…A component promontory is absent in most taxa examined (68, 0) with the exception of the guitarfishes P. horkelii and Z. brevirostris , and the skates B. nigriventralis , D. clarkii and L. garmani (68, 1; Hulley, 1972; McEachran & Martin, 1978, figures 1–4; McEachran & Compagno, 1982, figures 1–21).…”
Section: Resultsmentioning
confidence: 98%
“…A component roll is present in B. nigriventralis , L. garmani and D. clarkii (67, 1; McEachran & Martin, 1978, figures 1–4; McEachran & Compagno, 1982, figures 1–21). This structure is absent in all other taxa examined (67, 0).…”
Section: Resultsmentioning
confidence: 99%
“…Nevertheless, the interpretation of these features is often difficult, even for the experienced taxonomist. Classical pencil drawings have been considered the gold standard for more than 100 years in elasmobranch taxonomy, clearly outperforming photographs or radiographs, e.g., [ 7 , 27 , 30 , 31 , 38 , 41 , 50 , 51 , 55 , 58 , 59 , 60 , 61 , 62 ]. Recently, digital taxonomic drawings have emerged as an alternative, which has been employed to further simplify the features and, thereby, enable easier interpretation of the drawings, e.g., [ 9 , 53 , 54 ].…”
Section: Discussionmentioning
confidence: 99%