The detection of asymmetry can be difficult because the signals indicating right–left differences are frequently weak. When bilaterally symmetric organisms can be further inspected for positional asymmetry (differences between body sides in the placement of meristic traits) anterior–posterior allocation may provide additional evidence for fluctuating asymmetry. Statistical power comparisons wer...

Hoplocercidae is a small (10 species, 3 genera), poorly known but pivotal family of Central and South American iguanian lizards that has never been the subject of a focused phylogenetic study or systematic revision. We undertake the first rigorous phylogenetic analysis of hoplocercid lizards. We also use our analysis to demonstrate how meristic, morphometric, and polymorphic morphological chara...

this study was conducted to examine morphometric and meristic characteristics alongside pigmentation patterns of bream larvae, abramis brama orientalis, in four stages of larval development. morphological characters including total length (tl), standard length (sl), notochord length (nl), head length (hl), head depth (hd), eye diameter (ed) and mouth width (mw) were examined from hatching time ...

study of fishes on aquatic ecosystems in many respects, including ecology, behavior, biology, conservation and management of water resources, exploitation of resources and training are important. so in the autumn 2011, the population structure of barilius mesopotamicus was studied. in this order, 69 samples of the mentioned fish from seimareh (34 samples), changoleh (20 samples) and siahgave (1...

Two stocks of grass carp Ctenopharyngodon idella Val were collected from North, Mazandran and South, Khuzestan to compare some morphometric and meristic characters. The Khuzestan stocks were significantly greater in body length, intestine length and number of vertebrae than the Mazandran stocks (p<0.05). The body width, depth of Mazandran were higher but gill raker lower than another stock. The...

We examined geographic variation within the Ashy Darter, Etheostoma cinereum, of the mitochondrially enconded cytochrome b gene (cyt b) and nuclear recombination activation gene 1 (RAG1) as well as pigmentation, 6 meristic variables, and 20 morphometric variables for patterns indicative of speciation within the complex. Four geographically disjunct entities were identified by at least one of th...

Serially homologous systems with high internal differentiation frequently exhibit meristic constraints, although the developmental basis for constraint is unknown. Constraints in the counts of the cervical and lumbosacral vertebral series are unique to mammals, and appeared in the Triassic, early in their history. Concurrent adaptive modifications of the mammalian respiratory and locomotor syst...

in this study, by examining the character of the morphometric and meristic characters of garra variabilis samples which is obtained from different locality in tigris river, morphometric characters which are transformed, subjected to discriminant analysis and depending on grouping model, number of discriminant functions and according to importance of these in terms of explaining total variance, ...