1) Biological concept 
• (n.) See Homogeny.
(from the article `Australopithecus`) ...The rarity of skeletons makes the reconstruction of body size and shape dependent on many assumptions, which can be subject to interpretation. ...
Homoplasy is the similarity of characters found in different species that are NOT from common descent. Examples include the wings of insects and the wings of pterosaurs . These characters derive from convergent evolution, parallel evolution, or character reversal. 
Organs or other bodily structures within different species which resemble each other and have the same functions, but which did not have a common ancestral origin and development. Instead, the parts arose via convergent evolution and are thus analogies. ... (09 Oct 1997) ... 
Ho·mop'la·sy noun [ Homo- + Greek ... to form, mold.] (Biol.) See Homogeny . 
homoplasy, homoplasia Structural resemblance due to parallelism or convergent evolution rather than to common ancestry.
correspondence in form or structure, owing to a similar environment.