Evolution__3rd_Edition

Plate 3
Here in the lower row are six of the many forms of Papilio memnon, beneath the model
species that they may mimic. (a–f) Six suspected models: (a, b) two forms of the female
Losaria coon; (c) L. aristolochiae; (d) Triodes helena; (e) T. amphrysus; (f) Atrophaneura
sycorax. (g–l) Six forms of Papilio memnon. Three of the forms (g–i) mimic species (a–c)
that have tails, and three (j–l) mimic species (d–f) that lack tails. (m) Another form of
P. memnon, the rare probable recombinant form anura, from Java. It is like the normal
mimetic form called achates (illustrated in g–i), but it lacks achates’ tail. It may be a
recombinant between achates and a tailless form such as in (d–f) (Section 8.1, p. 195).
From Clarke et al. (1968) and Clarke & Sheppard (1969).
Plate 2
Large-beaked (left) and small-beaked (right) forms of the African
finch formally named Pyrenestes ostrinus and informally known as
the black-bellied seedcracker. The polymorphism is an example of
disruptive selection (Section 4.4, p. 80). (Courtesy of T.B. Smith.)