A scute or scutum (Latin
''scutum'', plural: ''scuta'' "shield
") is a bony external plate or scale overlaid with horn, as on the shell of a turtle
, the skin of crocodilia
ns, and the feet of birds
. The term is also used to describe the anterior portion of the mesonotum
s as well as some arachnids (e.g., the family Ixodidae
, the scale ticks).
Scutes are similar to scales
and serve the same function. Unlike the scales of lizards and snakes, which are formed from the epidermis
, scutes are formed in the lower vascular layer of the skin and the epidermal element is only the top surface . Forming in the living dermis
, the scutes produce a horny
outer layer that is superficially similar to that of scales. Scutes will usually not overlap as snake scales
(but see the pangolin
). The outer keratin
layer is shed piecemeal, and not in one continuous layer of skin as seen in snakes or lizards. The dermal base may contain bone
and produce dermal armour
. Scutes with a bony base are properly called ''osteoderm
s''. Dermal scutes are also found in the feet of birds
and tails of some mammals
, and are believed to be the primitive form of dermal armour in reptiles.
The term is also used to describe the heavy armour of the armadillo
and the extinct ''Glyptodon
'', and is occasionally used as an alternative to scales in describing snakes
or certain fishes, such as sturgeon
s, shad, herring, and menhaden.
The turtle's shell
is covered by scutes formed mostly of keratin
. They are built similarly to horn, beak, or nail in other species.
have five rows of scutes instead of scales.
and toes of most birds are covered in two types of scales. Large scutes run along the dorsal side of the tarsometatarsus and toes, whereas smaller scutellae run along the sides. Both structures share histochemical homology with reptilian scales, however work on their evolutionary development has revealed that the scales in bird feet have secondarily evolved via suppression of the feather-building genetic program.
[Sawyer, R.H., Knapp, L.W. 2003. Avian Skin Development and the Evolutionary Origin of Feathers. J. Exp. Zool (Mol Dev Evol) 298B:57–72.]
Unblocking the feather suppression program results in feathers growing in place of scales along the tarsometatarsus and toes.
Dinosaur species very close to the origin of birds have been shown to have had "hind wings" made of feathers growing from these areas, suggesting that the acquisition of feathers in dinosaurs was a whole-body event.
The bottoms of bird feet are covered in small, keeled scale-like structures known as reticulae. Evolutionary developmental studies on these scale-like structures have revealed that they are composed entirely of alpha keratin (true epidermal scales are composed of a mix of alpha and beta keratin).
These data have led some researchers to suggest that reticulae are in fact highly truncated feathers.
Insects and other arthropods
The term "scutum" is also used in insect
anatomy, as an alternative name for the anterior portion of the mesonotum
(and, technically, the metanotum
, though rarely applied in that context).
The same scutum is relatively less conspicuous after the tick has fed, because it has not changed in size, whereas the tick has swollen as it engorged
In the hard tick
s, the Ixodidae
, the scutum is a rigid, sclerotised
plate on the anterior dorsal
surface, just posterior
to the head. In species with eyes, the eyes are on the surface of the scutum. The flexible exoskeleton
posterior to the rigid scutum of the female tick, is called the alloscutum, the region that stretches to accommodate the blood with which the mature female tick becomes engorge
d. Males do not engorge nearly as drastically as females, so they do not need a flexible alloscutum; instead the rigid scutum covers practically the entire dorsal surface posterior to the head, and may be referred to specifically as the conscutum.
In some species of Opiliones
, fused abdominal segments are referred to as a scutum.
* Fish scutes
* Scale (zoology)
* Snake scales