pomphorhynchus laevis is a common fish parasite in europe which   has been reported from acipenser stellatus, barbus capito, barbus lacerta, barbus mursa and onchorhynchus mykiss in iran. in a survey on the aquaculture potential of gamasiab river in hamedan province, endemic fish parasites were investigated in summer and autumn 2008. after recording biometric characteristics, common necropsy an...

worldwide including iran, fasciola species are the causes of human and animal fasciolosis which have comparatively identical morphologies. the present study is aimed to identify different fasciola forms by using morphologic and morphometric variations from domestic ruminants of northwestern iran. a total of 130, 67 and 140 livers of cattle, water buffaloes and sheep respectively were collected ...

The fern Blechnum sprucei grows in Mesoamerica (Costa Rica) and South America, from Colombia to Bolivia, SE and centre of Brazil, Paraguay and Argentina. It is a distinctive, somewhat vulnerable, mostly orophilous species. Fresh and dry herbarium material was used for this study. Herbarium material for anatomical studies comes from CTES, BA, LP, MA, SI and UC (Holmgren et al. 1990). Selected re...

N 1.50-CHROMOSOME is a chromosome having two identical arms A (DARLINGTON 1939). Such chromosomes have been studied recently by RHOADES (1940) in Zea and by DARLINGTON (1940) in Fritillaria. It is also very probable that the extra chromosomes in secondary trisomics, such as the numerous types which have been found in Datura (BLAKESLEE and AVERY 1938) are true iso-chromosomes. The manner in whic...

BACKGROUND Somatic embryogenesis in conifer species has great potential for the forestry industry. Hence, a number of methods have been developed for their efficient and rapid propagation through somatic embryogenesis. Although information is available regarding the previous process-mediated generation of embryogenic cells to form somatic embryos, there is a dearth of information in the literat...

The chromosome number of 2n = 20 II reported here is the first determination for Hibiscadelphus giffardianus Rock and H. distans Bishop & Herbst. An earlier report of the same number for H. hualalaiensis Rock is substantiated. Cytogenetic analysis of H. x puakuahiwi Baker & Allen, a hybrid cross between H. giffardianus and H. hualalaiensis suggests that chromosome pairing and microsporogenesis ...

BOURRELLY, P. 1956. Initiation pratique a la systematique des algues d'eau douce. Bull. Micr. Appliq, ser. 2, 6: 122-141. CAVE, MARION S. AND MARY A. POCOCK. 1951a. The acetocarmine technique applied to the colonial Volvocales. Stain Tech. 26: 173-174. --AND ---. 1951b. Karyological studies in the Volvocales. Amer. Jour. Bot. 38: 800-811. -AND ---. 1956. The variable chromosome number in Astrep...

Lecithochirium musculus (Looss, 1907) is a hemiurid trematode common in Anguilla anguilla (Linnaeus, 1758) in the Mediterranean and Black Seas and the north-east Atlantic Ocean. This worm is also a parasite of a wide range of fish predators of gobiids. However, the presence of this fluke in species of the genus Conger (Cuvier, in Oken, 1817 ) is uncertain. Although there are reports of immature...

A heterochromatic block (HB) from N. otophora occasionally undergoes great enlargement to form a “megachromosome” in hybrids and hybrid derivatives with N . tabacum. This paper shows that the two large HB’s of closely related N . tomentosiformis, and perhaps a smaller one, also have the same capability. The evidence that both large HB’s form megachromosomes is twofold. In a segregating backcros...

Original meiotic chromosome counts are presented for 39 species in 15 genera of Acanthaceae from Belize, Costa Rica, Ecuador, Mexico, Panama, the United States, and Venezuela. These reports include the first counts for 20 species representing 10 genera of the family, including the first chromosome number documented for the genus Poikilacanthus. Counts for 15 species confirm numbers previously r...