Morphology Data of Chiloglanis longibarbis
Identification keys
Abnormalities
Main Ref. Schmidt, R.C., H.L. Bart, F. Pezold and J.P. Friel, 2017
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth sub-terminal/inferior
Type of scales
Diagnosis

Diagnosis: Chiloglanis longibarbis is distinguished from all other West African congeners, with the exception of C. waterloti, in having eight or fewer mandibular teeth in the functional row; it is distinguished from C. waterloti in having longer maxillary and mandibular barbels (Ref. 116018).

Description: A moderate-sized Chiloglanis; 41.4 mm maximum standard length observed; body dorsally depressed anteriorly; laterally compressed posteriorly; pre-dorsal convex; sloping ventrally towards orbit; pre-orbital convex; post-dorsal body sloping ventrally towards caudal fin; pre-anal profile convex; post-anal horizontal towards caudal fin (Ref. 116018). Small unculiferous tubercles scattered across body; higher concentrations on head and dorsum; lateral line complete; arising from level of orbit and sloping ventrally to midlateral along the side of body; urogenital papillae reduced and separated from anus by shallow invagination in females (Ref. 116018). Head depressed; gill membranes broadly united; gill openings restricted; opening slightly dorsal of pectoral-fin origin to lower margin of orbit; occipital-nuchal shield covered and visible through skin; eyes moderate; horizontal axis longest; without free margins; anterior and posterior nares positioned mid-snout length; posterior nares set slightly farther apart than anterior nares; nares with raised rims; posterior nares with elongated anterior flaps (Ref. 116018). Mouth inferior, upper and lower lips united to form oral disc; oral disc moderate in size, its width 18.7-21.2% of standard length; slightly longer than wide and covered in papillae (Ref. 116018). Barbels in three pairs; maxillary barbels originating from posterolateral region of the disc; unbranched and long, 38.2-44.4% of head length; lateral and medial mandibular barbels long; positioned on both sides of prominent midline cleft on posterior margin of disc; lateral barbels, 20.6-28.1% of head length, usually less than twice the length of median barbels (Ref. 116018). Primary premaxillary teeth "S"-shaped; exposed brown tips; 32-64 in three scattered rows on two ovoid tooth pads; secondary premaxillary teeth scattered on posterior surface of premaxillae; tertiary premaxillary teeth small and needle-like; in a row near midline on dorsal edge of toothplate; mandibular teeth in 1-2 rows; "S"-shaped and crowded near midline; functional, anterior, row usually contains eight brown-tipped teeth (Ref. 116018). Dorsal-fin origin just posterior to anterior third of body; dorsal fin with small spinelet, spine, and five rays; dorsal spine relatively long, 17.0-20.7% of standard length; anterior margin mostly smotth; posterior margin of spine with three small notches distally; adipose fin moderate in length, 19.2-27.0% of standard length; origin anterior to anal-fin origin; margin convex with small notch at terminus; caudal fin forked with rounded lobes; lower lobe longer than upper lobe; count i,7,8,i; anal-fin origin posterior to origin of adipose fin; margin convex; count iii,6; pelvic-fin origin at vertical between dorsal and adipose fin; margins convex; reaching anal-fin origin; count i,6; pectoral fin with slightly curved smooth spine; relatively long, 20.8-23.6% of standard length; count I,8-9 (Ref. 116018). Postcleithral process short and bluntly pointed in females (Ref. 116018).

Colouration: In dorsal view, body medium brown; mottling of yellow-buff to light brown along dorsum and side; head medium brown; areas of light brown at origin of dorsal fin and origin and terminus of adipose fin, melanophores scattered throughout; in lateral view, body yellow-buff with overlying medium browns; some light areas observed dorsally extend beyond the midline, dark areas below the midline, extending to near pelvic and anal-fin origins, and around the caudal peduncle; small dark brown melanophores scattered across sides; easily observed below the midline; ventral surface cream-buff with scattered melanophores; more numerous near pelvic and pectoral-fin origins; oral disc and barbels cream (Ref. 116018). Pectoral and dorsal spines and rays translucent to cream; melanophores at origin of dorsal and pectoral fins; scattered melanophores create a broad bar at mid-length; pelvic fins cream; bar of melanophores at mid-length; adipose fin translucent to cream; small area of brown near base at midlength; anal fin translucent to cream; melanophores at base and mid-length; caudal fin translucent to cream; brown areas near base and mid-length of upper and lower lobes (Ref. 116018).

Ease of Identification

Meristic characteristics of Chiloglanis longibarbis

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels 6
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 2 - 2
Soft-rays total 5 - 5
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 9 - 9

Paired fins

Pectoral Attributes  more or less normal
Spines     1
Soft-rays   8 - 9
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Spines     0
Soft-rays   7 - 7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Boden, Gert
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