Observation of spawn in Melanopsis praemorsa (Prosobranchia: Melanopsidae)
نویسندگان
چکیده
منابع مشابه
Larval stages of digenetic trematodes in Melanopsis praemorsa snails from freshwater bodies in Palestine.
OBJECTIVE To detect the species of larval trematodes (cercariae) in Melanopsis praemorsa snails from 5 different fresh water bodies in Palestine. METHODS A total of 1 880 Melanopsis praemorsa snails were collected from different fresh water bodies in Palestine from October, 2008 to November, 2010. Cercariae in Melanopsis praemorsa snails were obtained by lighting and crushing methods. The beh...
متن کاملبررسی هیستو- آناتومی نموغدد جنسی در حلزون (Melanopsis praemorsa L.(Gastropoda)) درمنطقه مزدوران خراسان
در این بررسی بیولوژی تولید مثل حلزون "ملانوپسیس پره مورسا" که در مزدوران ‘ در 100 کیلومتری شمال شرقی مشهد یافت می شود مورد مطالعه قرارگرفت .نمونه برداری هر ماه درطی مدت یکسال از ناحیه مذکور بعمل آمد. مطالعات نشان داد که این حلزون درسرتاسر در محل زندگی خود تخمگذری می نماید. در بین جمعیت بزرگی از این حیوان که از ناحیه ذکر شده جمع آوری گردید‘ مطالعات بافت شناسی به عمل آمده نشان داد که این حلزون از...
متن کاملA new melanopsid (Gastropoda) species from the middle Miocene Kupres Basin (Bosnia and Herzegovina)
Melanopsis fateljensis (Caenogastropoda: Cerithiimorpha: Melanopsidae) is described as a new species from the early Middle Miocene lacustrine deposits of the Kupres Basin. Similarities to other co-occurring melanopsids are discussed. Its unique morphology, in particular the elongate, stepped spire with prominent spiral bulges, clearly distinguishes the new species from all other Melanopsidae kn...
متن کاملThe development of isolated blastomeres in Bithynia tentaculata (Prosobranchia, Gastropoda).
The development of isolated blastomeres, separated at the first and second cleavage has been studied. After separation at the first cleavage, one half-embryo (CD) becomes swollen and balloon-like and develops adult organs such as eyes, tentacles, shell, operculum, etc. The other half (AB) is much more compact and never develops these adult structures. After separation on the alternate axis at t...
متن کاملPollen limitation and cleistogamy in subalpine Viola praemorsa
Early-flowering species may be especially susceptible to occasional pollen limitation and, therefore, may benefit from a mixed-mating strategy that provides reproductive assurance. We studied cleistogamous (CL) and chasmogamous (CH) fruit set of spring-flowering Viola praemorsa Dougl. ex Lindl. along an elevational gradient in the Rocky Mountains, testing whether pollen limitation or allocation...
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ژورنال
عنوان ژورنال: Journal of Molluscan Studies
سال: 1996
ISSN: 0260-1230,1464-3766
DOI: 10.1093/mollus/62.3.398