Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 86. (Budapest 1994)

Csorba, G. ; Topál, Gy.: First record and taxonomic status of Megaderma lyra from Vietnam (Mammalia, Chiroptera)

rostral width between canines (see Fig. 5), mandible length v. interorbital width (see Fig. 6), mandible length v. palatal bridge length. In all these cases the two samples are more or less well separated and, of course, the Vietnamese specimens are clearly the greater. In scatterplots analyzed and listed below, there is no overlap of values in condylobasal length (v. rostral width at the outer margins of molars, upper C-P4 length and upper C-M3 length), basal length (v. braincase width and lacrymal width). In these latter two (the South Indian No 93.11.1. and the North Indian No 93.10.2.) specimens approach the Vietnamese sample, and also in the scatterplots of interorbital width (v. upper Ml-M

3 length, bulla length and processus coronoideus height). The lower M1-M3 length is different without overlap in the two forms in many scatterdiagrams (e.g. versus lower C-P4 length (see Fig. 7), lower canine width, lower Ml length, lower M3 length, upper M3 width, etc.), however, two North Indian specimens (Nos 92.77.3. and 93.10.2.) seem to approach the values of the Vietnamese animals. Finally, according to some other scatterdiagrams analyzed, the palatal bridge length (v. upper M1-M3 length and processus coronoideus height), and braincase height (v. upper M1-M3 length) are different without overlap. Other diagrams (numerous diagrams have been analyzed) clearly show that in the lower C-M3 length but the single (No 93.10.2.) specimen overlaps the values of the Vietnamese sample, otherwise, the two samples are divided by a narrow strip. The upper C-M3 length (v. lower Ml length and processus coronoideus height), again the North Indian No 93.10.2. and the South Indian No 93.11.1. overlap the Vietnamese sample. The mastoid width overlapped by only one Indian specimen. There are more overlaps (three Indian animals) in the upper M1-M3 length and symphysis length. There are no practical differences in upper and lower C-P4 lengths (both show the slightest differences when we regard the dental-row measurements). In other scatterplots analyzed, in the values of single teeth (both length and width), because of the more pronounced overlaps, slight differences appear between the two forms. The external measurements analyzed (forearm length, tibia length and ear length) show extensive overlaps between the Vietnamese and Indian samples (see Fig. 8), though, amongst the Vietnamese Megaderma relatively more specimens have longer tibia and shorter ear than those of the majority of the Indian animals. RESULTS According to the analyses there is no sexual dimorphism in the present Indian and Vietnamese material. The external measurements also do not differ in the two forms. It is clearly seen that the skull-length values (condylobasal length and basal length) differ in the two samples. The interorbital constriction clearly differs in the two forms, that is narrower in the Indian animals and wider in the Vietnamese specimens. The lower M1-M3 length is apparently the only dental-row character which distinctly diverges in the specimens studied. Based on the above-mentioned morphological characteristics, larger size in some principle skull measurements, the Vietnamese Megaderma lyra population clearly belongs to the M. lyra sinensis subspecies. # * * Acknowledgements -We wish to express our gratitude to the staff of the National Center for Scientific Research of Vietnam, especially to Dr. TRUONG VAN LA, for making possible the field reserach, and PIÎTLR Un ILLY I for drawing the skulls.