An introduction to the study of mammals living and extinctLydekker, Richard
Science
An introduction to the study of mammals living and extinct
Lydekker, Richard
Mammals
Subfamily =Dasypodinæ=.—Fore feet usually with all five digits developed
and with nails, though the first and fifth may be suppressed. The
first and second long and slender, with the normal number and relative
length of phalanges. The others stout, with short broad metacarpals,
and the phalanges greatly reduced in length and generally in number
by coalescence. The ungual phalanx of the third very large, that of
the others gradually diminishing to the fifth. _Dasypus_, as now
restricted, has the most normal form of manus, but the modifications so
markedly developed in all the others (and culminating in _Tolypeutes_)
are foreshadowed, as it were, in it. Ears wide apart. Mammæ one pair,
pectoral.
_Dasypus._[104]—Teeth ⁹⁄₁₀ or ⁸⁄₉, of which the anterior in the upper
jaw is usually implanted in the premaxillary bone. The series of teeth
extends posteriorly some distance behind the anterior root of the
zygoma, almost level with the hinder edge of the palate. They are large,
subcylindrical, slightly compressed, diminishing in size towards each
end of the series; the anterior two in the mandible much smaller, and
more compressed than the others. Cranial portion of the skull broad and
depressed. Facial portion triangular, broad in front and much depressed.
Auditory bulla completely ossified, perforated on the inner side by the
carotid canal, and continued externally into an elongated bony meatus
auditorius, with its aperture directed upwards and backwards. (In all the
remaining genera of _Dasypodinæ_ the tympanic bone is a mere half ring,
loosely attached to the cranium.) Mandible with a high ascending ramus,
broad transversely-placed condyle, and high slender coronoid process.
Vertebræ: C 7, D 11-12, L 3, S 8, C 17-19. Head broad and flat above.
Muzzle obtusely pointed. Ears of moderate size or rather small, placed
laterally, far apart. Body broad and depressed. Carapace with six or
seven movable bands between the scapular and pelvic shields, each plate,
or scute, being marked by a regular ellipse formed of widely separated
punctures. Tail shorter than the body, tapering, covered with plates
forming distinct rings near the base. Fore feet with five toes; the first
much more slender than the others, and with a smaller ungual phalanx and
nail; the second, though the longest, also slender. The third, fourth,
and fifth gradually diminishing in length, all armed with very strong,
slightly curved, compressed claws, sloping away from an elevated rounded
inner border to a sharp, outer, and inferior edge. The hind foot rather
short, with all five toes armed with stout, compressed, slightly curved,
obtusely pointed claws—the third the longest, the second nearly equal to
it, the fourth the next, the first and fifth shorter, and nearly equal.
Public-domain text, read in full here on John Shaqi.
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