plesiomorphic


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Related to plesiomorphic: cladistics, Cladistic analysis, Plesiomorphy

ple·si·o·mor·phic

(plē'sē-ō-mōr'fik),
Similar in form.
Synonym(s): plesiomorphous

plesiomorphic

(of characters) primitive or ancestral.
References in periodicals archive ?
Another plesiomorphic species, Psammoduon deserticola (Simon 1910), from the Namib Desert, attacked tenebrionid larvae on the sand's surface.
In this section, I will describe in detail the myological and osteological structures of both the cephalic region and the pectoral girdle of the heptapterin Heptapterus mustelinus ('Nemuroglanis clade'), and compare these structures with those of two representatives of the other main, more plesiomorphic, heptapterin group, Goeldiella eques and Rhamdia guatemalensis ('basal clade').
Changes in stamen and carpel merosity within Aristolochia are all derived traits, with respect to the plesiomorphic hexamerous condition.
In contrast, we found high UV reflectance to be plesiomorphic for the Orbiculariae and flat and low UV reflectance to occur equivocally at the base of the Araneoidea [ILLUSTRATION FOR FIGURE 4B OMITTED].
The likely homoplastic occurrence of epidermal silica bodies across commelinids indicates that bundle-sheath silica is the plesiomorphic condition.
However, they named the next level of song complexity (straight up and stepwise downstroke) as a plesiomorphic pattern.
The claim that having eight segments is the plesiomorphic condition and nine segments the apomorphic condition is also questionable, because the presence of nine antennal segments is characteristic of most basalclade Thysanoptera (Mound et al.
scolodiscus) are placed in a plesiomorphic subgroup whereas the other eight species of the group are placed in the diastema subgroup (including three species described as new, two from the northern part of the biogeographic Choco and one from the eastern slopes of the Cordillera Central).
The preserved material shows characteristic plesiomorphic features for the genus, but lacks apomorphies.
Gold and Li (1991) hypothesized that a NOR located on a large acro-/subtelocentric chromosome may be plesiomorphic or primitive for the "Notropis"-like shiners, and hence for the subgenus Notropis as well.
It is not sense 3 because Frost refers not to unusual or apomorphic characteristics but to features that are plesiomorphic in the Baileyan scheme.
The Laurasian genera all have short, plesiomorphic proboscides without the specialised morphological adaptations for extracting nectar from deeply recessed floral nectaries apparent in most of the Afrotropical genera, a fact Brian thought 'remarkable' (Stuckenberg 2000b: 199).