Hinder margin of sternum with two deep incisions on each side; furcula free, not attached to the keel of the sternum, imperfect in some genera; a small unforked manubrium (spina externa) is present. Skull broad. Basal and second joints of third (middle) toe subequal in length.
The Asionidae may be divided into 3 subfamilies, thus distinguished :—
a. Facial disk and ruff well-marked.
a1. Ear-orifice smaller than eye; no operculum ; middle claw pectinate…………………………..Photodilinae, p. 268.
b1. Ear-orifice larger than eye and fur¬nished with an operculum; middle claw simple …………………………..Asioninae, p. 270.
b. Facial disk and ruff ill-marked or obsolete; ear-orifice smaller than eye; middle
claw simple…………………………..Buboninae, p. 280.
BookTitle:
The Fauna Of British India including Ceylon and Burma
Reference:
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol.3 1895.
Title in Book:
Family ASIONIDAE
Year:
1895
Page No:
267
M_ID:
6246
M_SN:
Tytonidae
Volume:
Vol. 3
Term name:
id:
1617
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