motionlessness, static flaring of operculum
, nonresponsiveness to touch stimuli, rigor mortis).
large, reaching past apical edge of coxa, with indent at apex halving it into two small same-sized mounds.
ellipsoidal, not or slightly passing posterior margin of sternite II.
The membrane supporting the operculum
is greatly elongated, so that externally Xenobalanus resembles a pedunculate barnacle.
At settlement, the shell was dark brown/black and the operculum
had grown to the same size as the opercular opening and had dark brown/black edges with a light brown center.
Anterior genital operculum
with 26 small and slender setae; grouped in a triangle; posterior operculum
with 9 basal setae.
with 3 oblique stripes extending from eye to dorsal part of the head; branchiostegal membrane whitish.
concolorous except narrow fuscous area on about middle of lateral margin.
The foot is composed of muscular tissue and nerve bundles, and it is partially covered by an operculum
03002), 6: (2)2(2): (2)6(2): 11: 12: 12: 12: 11: 11: 9: 2; holotype [female], 6: (2)3(2): (2)4(2): 10: 9: 11: 11: 11: 12: 8: 2; setae of anterior genital operculum
(sternite II) of Y very small.
Life colours: Male: body mostly reddish dorsally, each scale with yellow spot and red margin; head dull orange laterally, more reddish pink dorsally, operculum
golden; lower part of head and body pale pink, with mid-ventral scarlet streak on isthmus; anal and pelvic fins pale bluish grey, with irregular yellow spots; caudal fin dark red with rear margin yellow or pale bluish grey.
This new species is closely allied to Platylomia meyeri from northern Sulawesi in having long operculum
, wide abdomen, and the infuscation only at the bases of the apical cells 2 and 3 on the fore wing but is distinguished by blackish coloration of the dorsal and ventral parts of the body and the uncal lobe in a different shape.
In the experiments with snails lying on their backs on the wet surface and after 4 hours remaining unattached to the surface we had to sprinkle a few drops of seawater on the operculum
to prevent dehydration of the animals.
First four tergal somites of the opisthosoma not demarcated externally except by patterns of tubercles and coloration, tergite 5 distinguished anteriorly by incomplete transverse groove, tergites 6, 7, 8 + 9 and anal operculum
demarcated by transverse grooves.
Heads were removed and measured from tip of the mouth to firm edge of the operculum
(ram), and weighed with gills intact ([+ or -] 0.