Abstract
A new species of Oecanthus is described from Mexico. Oecanthus mhatreaesp. nov. occurs in central Mexico in the understory of tropical deciduous forest. Oecanthus mhatreaesp. nov. is currently known only from the Corregidora area of the Mexican state of Querétaro. The widened tegmina and chirp-like brief trills song are consistent with some members of the rileyi species group; however, this new species of tree cricket is different in several aspects. The chirp-like brief trills are generally irregularly spaced, it does not have the expected grouping of the chirp pulses, and the colors of buff, light olive green, or light brown are vastly different than the four known pale green species in the rileyi species group of the Western Hemisphere. Morphology, habitat, and song details of this new species, with the common name of Otomi tree cricket, are provided in this paper. Video can be viewed at www.oecanthinae.com.
Highlights
Materials and methodsThe study of the introduced plants resistance to new conditions cannot be limited to observations of external morphological changes occuring in the process of growth and development
The vital potential of pollen grains of one or several closely related species can be indirectly estimated by their size: the larger they are, the more vigorous the Arctic Environmental Research 19(2): 75–80 germination is
The morphological characteristics of pollen grains were assessed according to the following morphometric characteristics: diameter, pollen grain length, polar axis, height of a pollen grain with air bags, pollen grain projection area, perimeter, form factor, and eccentricity (Tikhov et al 1990)
Summary
The study of the introduced plants resistance to new conditions cannot be limited to observations of external morphological changes occuring in the process of growth and development. A systematic annual analysis of pollen viability usually accompanies traditional phenological observations of the introduced species. When studying this indicator one can determine morphological heterogeneity of the subject of research. The comparative study of pollen grains viability and morphology of two introduced species and a local species of Picea abies was carried out with the aim of determining the reproductive potential of the introduced species. The calculation of fertile and sterile grains and the study of the growth characteristics of pollen tubes were carried out on the 5th day by a light microscope. The significance level is 0.95, the sample size for each indicator is 100
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