| two new species of echinobothrium (cestoidea: diphyllidea) from myliobatiform elasmobranchs in the gulf of california, méxico. | two new species of diphyllidean cestodes, echinobothrium mexicanum n. sp., and echinobothrium fautleyae n. sp., are described, the former from the spiral intestines of the bat rays myliobatis californicus and myliobatis longirostris and the latter from the spiral intestine of the cownose ray rhinoptera steindachneri, all caught in the gulf of california, méxico. echinobothrium mexicanum is most easily distinguished from the majority of the species of the genus by the number of large apical hooks ... | 1999 | 10219317 |
| mercury and arsenic in muscle and liver of the golden cownose ray, rhinoptera steindachneri, evermann and jenkins, 1891, from the upper gulf of california, méxico. | mercury and arsenic levels in muscle and liver of rhinoptera steindachneri were determined in organisms collected in 2006. element concentrations in both tissues were directly related to size. maxima mean concentrations of hg and as (0.41 and 59.9 microg g(-1) dry wt, respectively) were found in adults muscle. mercury concentrations were significantly different between juveniles and adults in muscle and liver. for as concentrations, differences between juveniles and adults were found only in mus ... | 2009 | 19434357 |
| serendip deborahae n. gen. and n. sp. (eucestoda: tetraphyllidea: serendipidae n. fam.) in rhinoptera steindachneri evermann and jenkins, 1891 (chondrichthyes: myliobatiformes: myliobatidae) from southeastern ecuador. | cestodes collected in spiral valves of rhinoptera steindachneri from the southern coast of ecuador represent an undescribed species of tetraphyllidea. the new species has bothridia possessing septa but lacking apical suckers. it is diagnosably distinct from all other tetraphyllidean genera by possessing a scolex comprising 4 triangular bothridia that are fused together forming a platelike structure, each of which is subdivided by 2 simple and 1 bifurcating septa radiating from its base and ringe ... | 1995 | 7876984 |
| two new species of duplicibothrium williams & campbell, 1978 (tetraphyllidea: serendipidae) from the pacific cownose ray rhinoptera steindachneri. | two new tetraphyllidean species, duplicihothrium caircae n. sp. and d. paulum n. sp., are described from pacific cownose rays rhinoptera steindachneri collected from the gulf of california. d. cairae n. sp. differs from the only other known species in this genus, d. minutum, in its possession of two posteriorly bifurcating longitudinal septa on each bothridium and having a greater number of loculi per bothridium, wider bothridia and a greater number of segments per worm. d. paulum n. sp. differs ... | 2000 | 10966221 |
| anatomical comparison of the cephalic musculature of some members of the superfamily myliobatoidea (chondrichthyes): implications for evolutionary understanding. | this article describes the anatomy of the dorsal and ventral cephalic musculature of gymnura marmorata, g. micrura, aetobatus narinari, myliobatis californica, m. longirostris, rhinoptera steindachneri, mobula munkiana, and m. thurstoni. it was observed that muscles of the dorsal cephalic region showed little variation among species, with the exception of the dorsal longitudinal bundles and the cucullaris muscle. the ventral cephalic musculature showed wider differences, mainly in the depressor ... | 2003 | 12552642 |
| nutritional value of various ray fish liver oils to the pacific white shrimp litopenaeus vannamei. | a 32-day comparative feeding trial was performed to evaluate the nutritional value of four different ray fish liver oils to the pacific white shrimp litopenaeus vannamei. four feeds were prepared with liver oil extracted from dasyatis brevis, rhinoptera steindachneri, aetobatus narinari, and r. bonasus. a control feed was prepared with menhaden fish oil. ray fish liver oils were mainly composed of poly- and highly unsaturated fatty acids and contained levels of 20:5n-3 and 22:6n-3 comparable in ... | 2008 | 18807083 |
| diphyllidean cestodes of the gulf of california, méxico with descriptions of two new species of echinobothrium (cestoda: diphyllidea). | as part of a survey of parasites of elasmobranchs in the gulf of california, a second and final report of the diphyllidean cestodes resulting from the survey is presented. of 43 species of elasmobranchs examined for parasites, 7 (rhinobatos productus, rhinobatos leucorhynchus, myliobatis californicus, myliobatis longirostris, urobatis halleri, urobatis maculatus, and rhinoptera steindachneri) were found to host diphyllidean cestodes, all belonging to echinobothrium. no species of either of the o ... | 2001 | 11227887 |