(Dobson, 1871)
Thick-eared bat
External characters (Table 82)
According to Dobson, 1876, forearm length is approximately 40.3 mm (= 1.6 inches) in an adult male. The ears are triangular with rounded tips; the lower portion of each ear (from below the level of the tip of the tragus to the posterior border of the pinna near the angle of the mouth) is very thick and fleshy; and appears as if "it were excavated out of the thick integument of the neck". The tragus is short, broadly rounded-off above and curved inwards as in Nyctalus (Fig. 224). The head is flat, the muzzle very short and broad and with the glandular areas much developed. The wings are attached to the base of the toes. The pelage is dark brown above, paler below.
Cranial characters
The following brief description is based on the single individual from Thailand illustrated in Lekagul and McNeely, 1977. The greatest length of skull is 21.2 mm. The dorsal profile rises smoothly to the prominent lambda. The lambdoid crests and mastoid region appear well developed. The zygomata are robust and the jugal bone has a small dorsal projection. The tympanic bullae are not enlarged, they are subequal in width to that of the basioccipital between them.
Dentition
- The first incisor I2) is bifid and much larger and longer than the second (I3) (Dobson, 1876). The canine is well developed; it has a cingulum but no accessory cusps. There is no small upper premolar (PM2) but PM4 is robust and about two-thirds the height of the canine. M3 is less than half the crown area of M2.
- There are three lower incisors. The first lower premolar (pm2) is small and compressed between the canine and the second lower premolar (pm4).
Variation
All specimens are referred to the nominate form E. p. pachyotis .