Plesiomorphous

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Related to Plesiomorphic: cladistics, Cladistic analysis, Plesiomorphy

Ple`si`o`mor´phous


a.1.Nearly alike in form.
References in periodicals archive ?
Compared with similar congeners, the new species presents more plesiomorphic conditions in several characters: e3 and i2 sensilla on Ant.
Are they plesiomorphic, positioned at the base of the mollusc tree, or are they derived?
This clade is diagnosed on presence of an ejaculatory bulb and pump of the male genital tract, and lack of an embryonic egg-burster, but females are also characterized by a well-developed ovipositor, even though this is probably a plesiomorphic state and has been achieved independently in the gerrid subfamily Rhagadotarsinae (Damgaard, 2008b).
Both features can certainly be interpreted as plesiomorphic and would place Paracalynda as the adelphotaxon ofthe remaining Eusermyleformia except Litosermyle Hebard, 1919 [rather than Megaphasma as suggested by Bradler (2009)].
This gap should be filled because, as Raven (1980) pointed out, mygalomorphs have many features that are plesiomorphic for spiders and this suggests that research on these spiders will provide important perspectives on evolutionary hypotheses.
xanthochrum possessing the most plesiomorphic condition in the genus), the application of Sanzo's (1911) nomenclature of rows a and c for the longitudinal papillae rows below the eye is incorrect since these papillae represent the remnants of the vertical rows 1-5 (see also Hoese et al.
The latter four genera belong to the Zodariinae, while the first four are considered plesiomorphic.
SUMMARY: The cephalic and pectoral girdle structures of the heptapterin Hepapterus mustelinus ('Nemuroglanis clade') are described and compared to those of two representatives of the other, more plesiomorphic, main heptapterin group, namely Goeldiella eques and Rhamdia guatemalensis ('basal clade'), as well as of several other catfishes, as the foundation for a discussion on the synapomorphies and phylogenetic relationships of the Heptapterinae.
Under these hypotheses, and according to the available cytogenetic data of Nepomorpha, we suggest that the presence of XY sex chromosome system and a pair of m chromosomes could be considered plesiomorphic characters for this infraorder (Fig.
As Bolton (1987) points out, the clypeal configuration in Allomerus can be a plesiomorphic condition or a secondary broadening.
2005) suggested that this can be a plesiomorphic character or may have arisen independently in Bibimys and Scapteromys.