Encore pseudoobscura

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+[[!meta title="Morphological differences between two sibling species; Drosophila pseudoobscura and Drosophila persimilis"]]
+[[!tag Drosophila]]
+
+Rizki MT
+
+Proc Natl Acad Sci U S A. 1951 Mar;37(3):156-9. doi:10.1073/pnas.37.3.156
+
+Morphological differences between two sibling species; _Drosophila pseudoobscura_ and _Drosophila persimilis_.
+
+[[!pmid 14808171 desc="The first morphological difference that distinguishes _D. persimilis_ from _D. pseudoobscura_: penis size."]]

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 **  Work in progress **
 
+### _pseudoobscura_
+
 Analysis of Cox2 sequences of _Drosophila_ species by [[Beckenbach, Wei and Liu
 (1993)|biblio/8393127]] are most compatible with a speciation of _D.
 melanogaster_ and _D. pseudoobscura_ ~35 My ago.  Sequence divergence between
@@ -18,6 +20,12 @@ describe them as a network of successive large-scale inversions.  They also
 showed that the gene order of the X2 chromosome of _D. miranda_ is homologoues
 to the one of the hypothetical ancestor of chromosome 3 in _D. Pseudoobscura_.
 
+"Race B" of _D. pseudoobscura_ is now called "D. persimilis".  For some time
+it was thought that there are no morphological differences, but it was
+later found that the size of their penis differs ([[Rizki MT, 1951|biblio/14808171]]).
+
+### Other
+
 The ITS2 sequence of Drosophila species diverged at the speed of 1.2 % per million
 year ([[Schlötterer and coll., 1994|biblio/8015444]]).