Description of a new osphromenoid fish from the Congo

Publication Type:Journal Article
Year of Publication:1899
Authors:G. A. Boulenger
Journal:Annals and Magazine of Natural History
Volume:3
Pagination:242–243
URL:http://biostor.org/reference/66443
Full Text

242 On a new Osphronienoid Fish from the Congo.
XXXVIII. — Description of a new Osphromenoid Fish front
the Congo. By G. A. Boulenger, F.R.S.
Anahas {Ctenopoma) fasciolata.
No palatine teeth. Depth of body 2^ to 2J in total length,
length of head 3^ to 3^ times. Snout obtuse, a little shorter
than the diameter of the eye, which is 4 times in length of
head ; interorbital space a little broader than diameter of eye ;
maxillary extending hardly to below anterior border of eye ;
3 or 4 spines above and 1 or 2 below opercular notch ; sub-
opercle entire or indistinctly serrated ; four series of ctenoid
scales between the orbit and the angle of the prjBopercle.
Dorsal XVI 8-9 ; last spine longest, half length of head ;
middle soft ray produced in a filament. Anal X 9-11. Dorsal
and anal fins very narrowly separated from the caudal, which
is rounded. Pectoral as long as head. Ventral produced into
a filament, reaching fifth or sixth anal spine. Scales very
finely striated, 27-28 ? ; lat. 1. ~^. Pale brown, with 6 or 7
wavy darker vertical bars broader than the spaces between
them ; dorsal and anal fins edged with blackish ; ventrals
blackish.
Total length 70 niillim.
Three specimens from Monsembe, Upper Congo.
Presented to the British Museum by the Rev. J. H. Weeks.
The discovery of this new species, together with that of
A. nigropannosa at the same locality, raises to four the
number of species known from the Congo. Ctenopoma nigro-
pannosum was described by Reichenow in 1875 (Sitzb, Ges.
nat. ¥r. Berl. p. 147) from specimens from the Loango Coast
and the Gaboon ; Gunthcr, in 1896 (Ann. & Mag. Nat.
Hist. [6] xvii. p. 269), overlooking Reichenow's description,
renamed it C gabonense. The four Congo species may be
easily recognized by means of the following key : —
I. Caudal peduncle short but very distinct, tlie space
between tlie anal and caudal tins equalling at
least the diameter of tlie eye ; subopercle
strongly serrated.
Dorsal with 19 or 20 spines ; ventral not reaching
anal ; maxillary extending to below centre of eye . . A. tiiffrojumnosa,
Dorsal with 17 spines; ventral extending far be- [Reichen.
yond origin of anal ; maxillary extending to below
anterior fourth of eye A, com/ica, Blgr.
On Two new Butterflies from Equatorial Africa. 243
II. No distinct caudal peduncle, the dorsal and anal
fins nearly reaching the caudal ; subopercle
entire or indistinctly serrated ; dorsal with 1(5
or 17 spines.
Ventral reachinp: far beyond origrin of anal ; length
of head much less than depth of body, 3;^ to S-g- in
total length ; maxillary hardly extending to below
anterior border of eye A.faseiolaia, Blgr.
Ventral extending to origin of anal ; length of
head equal to depth of body, 2^ to 2f in total
length ; maxillary extending to below anterior fifth
or anterior third of eye A. Wceksii, Blgr.
Anahas [Ctenopoma] Petherici^GtiXw., does not occur in the
rivers flowing into the Atlantic. Specimens from the Gaboon
have recently been referred to it by Giinther; but I And on
careful examination that they really belong to A. ((7.) Kings-
leyce, Gthr., which differs from the White Nile species in the
absence of spines on the scales behind the eye. The depth
of the body is 2^ to 2^ in the total length (2| to 3 in
A. Petherici), and the anal spines number more frequently
9 than 10.
Ct. microlepidotum, Gthr., is identical with Sandelia
Bainsii, Casteln. I have not yet been able to ascertain
which specific name has priority.
The genera Ctenopoma^ Spirobranchus^ and Sandeh'a
cannot be upheld. The types of all three have the air-
bladder bifid behind and prolonged into the caudal region, as
in Anahasj and the palatine teeth may be absent in specimens
otherwise referable to Ctenopoma.
XXXIX. — Description of Two new Butterflies collected hy
Major E. M. Woodward in Nandi, Equatorial Africa.
By Emily Mary Sharpe,
Family Nymphalidae.
Nej^tts Woodwardi, sp. n.
Allied to N. incongrua, Butler (P. Z. S. 1896, p. 112,
pi. vi. fig. 2), from Nyasaland.
This species differs from the allied form in the absence of
light spots on the inner margin of the primaries, and no
spots are visible at the end of the discoidal cell, so that the

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