Morphology Data of Aapticheilichthys websteri
Identification keys
Main Ref. Huber, J.H., 2007
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Sexual dimorphism is marked in adults, not in subadults that besides are less deep-bodied: in male, the length of unpaired fins is longer and with a posterior disruption and the length of ventral fins is much longer and pointed terminally in male (Ref. 78622).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth superior

Diagnosis: It is distinguished from all other lampeyes by the superimposed insertion of dorsal and anal fins vs. dorsal fin insertion always posterior to anal fin insertion by at least 4 rays; besides it is separated from the similarly patterned and sympatric Aplocheilichthys spilauchen by the smaller maximum size in both sexes, by the more advanced dorsal fin, by the less high peduncular depth, by the presence of red pigment markings on male sides and unpaired fins vs. silvery or gold markings, by the absence of a barred pattern on male sides vs. presence, by the absence of melanistic pigments on body vs. with many dark small spots, by the absence of extended rays in male posterior anal fin vs. presence, and by being more laterally compressed; it is separated from Procatopus, Plataplochilus and Rhexipanchax species by the more sharply pointed mouth in addition to the D/A value (Ref. 78622). It is separated from its congeners living in the same region from southern Equatorial Guinea to Cabinda by the rounded shape of the posterior margin of dorsal and anal fins in both sexes vs. cut straight along the last ray, by the vertical red bars in male vs. never such a pattern, by the more conspicious reticulated gray 'net along scale edges vs. faint or absent, and by the absence of an upper acumen or extension in caudal fin of dominant male vs. presence (Ref. 78622).

Description: A small, deep-bodied lampeye killifish with a pointed mouth and snout, with advanced superimposed vertical fins, with an orange spot on upper eye margin of both sexes, with red curved bars on unpaired fins of male, with a gray reticulation on sides (Ref. 78622). Eye large, about 10% of standard length, and like all lampeyes, interorbital narrow, about 15% of standard length. Dorsal fin rays 7-9; anal fin rays 11-13; dorsal/anal insertion derivation -1 to +1; caudal fin longer than deep, 28.5-35.5% of its width; pectoral fin rays 9-10 with a relatively lower median insertion, tip of ventral fins reaching 5th or 6th anal fin ray in adult male, terminally branched rays in unpaired fins (Ref. 78622). Number of scales in longitudinal line 25-28; transversal scales obliquely from dorsal fin insertion towards ventral fins 7.5-8.5; circumpeduncular scales 13-15; two or three series of scales on caudal peduncle (Ref. 78622). Predorsal length short 61.3-65.8% of standard length; preanal length 61.5-65.9% of standard length; preventral length 45.9-50.7% of standard length; and rounded body, very deep with a strong allometry in growth, 20.3-28.5% of standard length, head short 23.5-28.0% of standard length (Ref. 78622). Teeth unicuspid, conical, like all lampeyes, very rare ctenoidy on scales, no branchiostegal appendages in male, no enlarged postopercular scales, four preopercular pores, supraorbital neuromast cephalic pattern variable and intermediate, G-type frontal squamation, with minute scales covering sensitive supraorbital organs (Ref. 78622).

Colouration: In life similar in both sexes, notably for the body gray reticulation and the upper orange spot on eye, except the unpaired fins, red-barred in male with five to six curved bars in caudal fin and posteriorly in vertical fins, hyaline in female (Ref. 78622). In some dominant males, a few red spots are seen on sides near peduncle and the ventral fins (Ref. 78622). Colouration after preservation: the red markings become fainter than in life and the orange spot on eye vanishes; the thin dark line on mid sides, characteristic of lampeyes, is present but only conspicuous on juveniles, from after the opercle to the peduncle, and only seen posteriorly in subadults and hardly seen in fully adult specimens; the other typical thin dark line along lower body base is also conspicuous in juveniles, but less so in subadults and not seen in adults; in both sexes, a faint slightly oblique dark short band on preopercular region, just above the level of insertion of pectoral fins, a dark spot just behind the lower part of eye, and a minute gray dot at base of each anal fin ray, not seen in other lampeyes, are present; the pectoral fins of adult dominant male are somewhat dusky gray with a thin lower dark edge (Ref. 78622).

Ease of Identification

Meristic characteristics of Aapticheilichthys websteri

Lateral Lines Interrupted: No
Scales on lateral line 25 - 28
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 13 - 15
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 7 - 9
Adipose fin absent

Caudal fin

Attributes more or less truncate; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 11 - 13

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   9 - 10
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
Modified by Boden, Gert
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