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Donald W. Linzey. Figure 8.38. Basic feather types: (a) contour feather; (b)
semiplume; (a) flight feather; (d) down feather; (e) bristle feather; (f) filoplume.
Secondaries (b) Ventral view Figure 8.39. Feather tracts (pterylae) in. Anterior
barbules ...
2
Inner Bird: Anatomy and Evolution, The
Are the down and body feathers restricted to specific tracts (pterylae) or are they
scattered over the body? Do the feathers have an aftershaft? Is there a tuft of
down on the oil gland? How many feathers are there in the tail or the wing, and
how ...
3
Modern Text Book of Zoology: Vertebrates
But in Carinatae, feathers are arranged in distinct patches or tracts, called
pterylae, which remain separated by featherless interspaces, called apteria. The
arrangement of pterylae varies in different orders, families and even species of
birds.
4
Ornithology in Laboratory and Field
The same condition would superficially appear to be true of all flying birds, such
as the Common Pigeon and House Sparrow, but close inspection reveals that
their contour feathers arise from tracts or pterylae (singular pteryla) on the skin
and ...
Olin Sewall Pettingill, Jr., 1985
5
Natural Gardening for Birds: The Bird-friendly Backyard : ...
s Pterylae ' , Birdbatk Bonanza TALES from a BIRDER • ^. run their feathers
through their beaks to realign the hooks (also called barbs) that give the feathers
the structural integrity needed for successful flight. Contrary to what some might
think, ...
Its anterior limit cannot be determined with accuracy as it merges indistinctly with
the head tracts (pterylae capitales). For experimental purposes it is convenient to
fix its anterior limit arbitrarily at the level of the front edge of the atlas (Mauger ...
7
The Puerto Rican honeycreeper (Reinita): Coereba flaveola ...
The spinal pterylae are beginning to show, especially from the base of the neck
to the hip. The pelvis tract of the spinal pterylae is beginning to show. The ventral
pterylae are beginning to show. The eyes are still closed. These birds were ...
Virgilio Biaggi, University of Puerto Rico (Río Piedras Campus). Agricultural Experiment Station, 1955
8
The Integument: A Textbook of Skin Biology
FEATHER AREAS (PTERYLAE) Feather follicles are confined to well-defined
areas known as pterylae. Between these regions the skin is devoid of follicles but
is nevertheless covered by plumage from adjacent sites. Feather growth usually ...
Richard Ian Campbell Spearman, 1973
9
Blue Grouse: Their Biology and Natural History
8.1 1).7 It includes the sternal apterium, and after loss of feathers, skin of the
abdominal pterylae. It also likely includes posterior regions of the sternal pterylae
, and upper and inner parts of the crural pterylae. It develops as a result of the
loss of ...
F. C. Zwickel, James F. Bendell, 2004
10
Hyman's Comparative Vertebrate Anatomy
All the small feathers of the body are called contour feathers, and they are
arranged in clearly defined tracts, the pterylae (sing., pteryla) ; the spaces
between them are called apteria (sing., apterium) . These details can be seen on
the plucked ...
