A NEW SPECIES OF HYLOMYS 
FR 
MX 

CORF 
SPALF 
al 
PR 
SQ 
OPTF 
FOV 
SOPF 
Fig.3 Lateral view of left orbital region of Hylomys megalotis BMNH 1999.44. Scale = 1 mm. Abbreviations: AL — alisphenoid, ALIC — alisphenoid 
canal, CORF — cranio-orbital foramen, EF — ethmoid foramen, FOV — foramen ovale, FR — frontal, MX — maxilla, OPTF — optic foramen, OS — 
orbitosphenoid, PL — palatal, PR — parietal, PT — pterygoid, SOPF — suboptic foramen, SPALF — sphenopalatine foramen, SPORF — sphenorbital 
foramen, SQ — squamosal. 
palatine suture and the palatine artery grooves are small or indis- 
tinct. The anterior opening of infraorbital canal is dorsal to P3/P4 in 
most species of Hy/lomys but dorsal to P4/M1 in H. megalotis, H. 
parvus and Echinosorex, and yet more posteriorly positioned in 
Podogymnura. 
The dentition of H. megalotis is considerably more robust than 
that of any of the other species of Hylomys. The dental formula is the 
same as in H. suillus and H. parvus and these species are distin- 
guished from H. hainanensis, which lacks p1 and H. sinensis, which 
lacks P1 and pl. In H. megalotis and H. parvus, P2 has two roots, 
unlike the other species which have either one or two well fused 
roots. Unlike all other species which lack a lingual cusp, P3 of H. 
megalotis has a well developed lingual cusp as in Echinosorex, and 
this tooth is large with three roots as in Podogymnura and 
Echinosorex, p3 is larger than p2 with two roots as in H. parvus, 
Podogymnura and Echinosorex, while p3 is slightly smaller than p2 
with one root in A. suillus, H. sinensis and H. hainanensis. 
RESULTS OF THE PHYLOGENETIC 
ANALYSIS 
Forty equally most parsimonious trees were retained in the branch 
and bound analysis, 141 steps in length, with a Consistency Index of 
0.72, Retention Index of 0.93 and Rescaled Consistency Index of 
0.66. In all most parsimonious trees the two subfamilies, Galericinae 
and Erinaceinae, readily segregated and the Galericinae further 
separated into two distinct groups: a clade comprising Echinosorex 
and Podogymnura, the other clade confined to Hylomys. Most of the 
variation found among all trees occurred within the Erinaceinae, 
since for the Galericinae twenty of the trees showed the configura- 
tion seen in Fig. 4a, while the remaining trees all showed the 
alternative arrangement for this subfamily (Fig. 4b). That part of the 
tree obtained by Frost ef al. (1991: Fig.9) for the Galericinae is 
illustrated as part of Fig. 4a. The strict consensus tree (see Fig. 5) 
revealed strong bootstrap support (97%) for the Galericinae and for 
aclade of H. suillus, H. sinensis and H. hainanensis, and this tritomy 
also had a high Bremer support index. There was moderate bootstrap 
support (83%) for a clade of H. suillus, H. sinensis, H. hainanensis 
and H. parvus, and a clade comprising all species in the genus 
Hylomys occurred in 77% of the replicates. The bootstrap support 
value for a clade of Echinosorex and Podogymnura was low at only 
64%. Within the genus Hylomys, H. megalotis was basal to all other 
species. Clades with bootstrap support values less than 50%, respec- 
tively of H. sinensis and H. hainanensis (42%), and H. suillus and H. 
hainanensis (43%) were considered to be unresolved. 
The shared derived character transformations (synapomorphies) 
which were revealed by the analysis are recorded below, using the 
format of character number quoted from Frost er al. (1991) followed 
by character transformation state, where (0) equals the ancestral and 
(1) the derived character state. 
SYNAPOMORPHIES OF GALERICINAE: 
[8.1] Antorbital or pre-lacrimal flange: (0) not developed, lacrimal 
canal visible in lateral view; (1) developed so that the lacrimal canal 
is obscured in lateral view. CI 1.000. 
[10.2] Jugal size; (0) large, reaches lacrimal; (1) small, does not 
reach lacrimal; (2) vestigial, confined to lateral rim of zygoma; (3) 
absent. In ACCTRAN the transformation was from | — 2, in 
DELTRAN the change was from 3 — 2. CI 1.000. 
[62.1] P4 lingual roots: (0) one; (1) two unfused; (2) two fused. CI 
1.000. This state occurs in all Galericinae but was shown only in 
DELTRAN. 
