Systematics and evolution of bats of the genus Glossophaga / [book]

William David. Webster
1993 unpublished
In any systematic investigation it is imperative to partition the total variation for each taxon into components that represent recognizable subunits such as variation due to age, secondary sexual variation, individual variation irrespective of age and sex, and an error variation associated with the investigator (Straney, 1978) . Nongeographic variation classically has been quantified as the coefficient of variation (CV); however, in some past systematic studies no effort was made to take
more » ... made to take account of other sources of variation and the CV thus becomes spurious. In this investigation every attempt has been made to partition variation into categories that best explain the total variation within each taxon. Ontogenetic variation was not examined because only adults were measured. Secondary sexual variation was examined prior to the assessment of individual variation to minimize the interaction between the two. Error on my part was estimated at 1.23 percent by measuring a series of specimens on two separate occasions (11 months apart) . Secondary Sexual Variation From selected localities, adult males were tested against adult females for each species using single classification ANOVA to determine if the sexes were significantly different in size. Weight was not included in these analyses. The results of these tests are discussed 14 22 zygomatic breadth, breadth of braincase, depth of braincase, length of maxillary and mandibular toothrows, and mandibular length), whereas males averaged larger than females in two (interorbital breadth and width across molars). Glossophaga mexicana.-Females were significantly larger than males only in length of maxillary toothrow, but averaged larger than males in eight other of the 16 measurements (length of forearm, length of fourth metacarpal, length of fifth metacarpal, condylobasal length, length of rostrum, depth of braincase, length of mandibular toothrow, and mandibular length) . Males were found to be significantly larger than females in two measurements (zygomatic breadth and breadth of braincase) and averaged larger than females in five (length of third metacarpal, greatest length of skull, mastoid breadth, interorbital breadth, and width across molars). Glossophaga soricina.-Females were found to be significantly larger than males in seven (length of forearm, greatest length of skull, condylobasal length, length of rostrxim, length of maxillary toothrow, length of mandibular toothrow, and mandibular length) of the 16 measurements tested, and averaged larger than males in another four (length of third, fourth, and fifth metacarpals, and breadth of braincase). Males were significantly larger than females in width across molars and averaged larger than females in zygomatic breadth, mastoid breadth, interorbital breadth, and depth of braincase. Conclusions.-Females were found to be significantly larger than males in 22.50 percent of the measurements tested and averaged larger 32 uropatagium, and Ml and M2 taper posteriorlabially because a hypocone is absent. These genera presently are known to be sympatric only on Jamaica (M. r. redmani and G. soricina antillarum) and St. Vincent (M^ plethodon luciae and G. longirostris rostrata).
doi:10.5962/bhl.title.156491 fatcat:cxctvdsz6zfglol55isxbtmse4