Morphology Data of Lethenteron camtschaticum
Identification keys
Abnormalities
Main Ref. Morrow, J.E., 1980
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 eel-like
Cross section
Dorsal head profile
Type of eyes more or less normal
Type of mouth/snout sucker-like
Position of mouth
Type of scales
Diagnosis

Characterized by 2 large teeth on the supraoral bars, the presence of only 2 points on the central pair of lateral tooth plates, and the presence of a row of posterial teeth (Ref. 27547). Dorsal fins arise far back on body, the anterior dorsal lower than the posterior, the fins higher in males; lower lobe of caudal fin is somewhat larger than upper, the fin joined to both dorsal and anal fins; anal fin small, in males represented only by a low ridge (Ref. 27547). Color ranges from brown to olive to grayish above, paler below (Ref. 27547). The non-anadromous form rarely grows larger than 18 cm (Ref. 27547). Other adult diagnostic features: 11.0-62.5 cm TL. Wet weight of individuals 14.5-35.0 cm TL, 3.2-87.7 g. Body proportions, as percentage of TL (based on 63 specimens measuring 13-46 cm TL): prebranchial length, 7.3-21.3; branchial length, 7.8-20.8; trunk length, 21.9-56.3; tail length, 24.6-30.8; eye length, 0.7-3.7; disc length, 4.5-7.7. Intestinal diameter up to 13 mm. Urogenital papilla length, as a percentage of branchial length, in 6 spawning males measuring 33.9-40.1 cm TL, 14.6-19.5. Trunk myomeres, 65-77 [Kucheryavyi et al. (2007) reported counts of 63-85 for 19 downstream migrants and 55-79 for 87 anadromous individuals from Utkholok River Basin, Kamchatka]. Dentition: supraoral lamina, 2 unicuspid, rarely bicuspid, teeth; infraoral lamina, 6-10 teeth, usually 8 (as few as 5), the lateralmost tooth on either end usually bicuspid, the internal ones unicuspid; usually 3, rarely 4 endolaterals on each side; endolateral formula typically 2-2-2 with variant formulae, 2-2-1, 2-2-2-2, 2-2-2-1; 3 rows of anterials; first row of anterials, 3 unicuspid teeth; total number of anterials, 20-33 teeth [5-43 according to Kucheryavyi et al. (2007) and as low as 11 according to Iwata et al. (1985), which may be due to regional effects, but this requires further investigation]; exolaterals absent; single row of posterials, 12-28 teeth; transverse lingual lamina, 13-18 teeth, the median one greatly enlarged; longitudinal lingual laminae each with 10-14 teeth. Velar tentacles, 5-7, with tubercles and with the single median tentacle shorter than the lateral tentacles immediately next to it, and with dorsal velar wings on either side, each consisting of a single tentacle. Body coloration (live) of recently transformed adults brown on dorsal and lateral aspects and silvery on ventral aspect, while upstream spawning migrants have a yellowish olive dorsal aspect, becoming lighter on the lateral aspects, and dull yellowish on the ventral aspect. Lateral line neuromasts unpigmented. Gular region unpigmented. Second dorsal fin with a dark blotch near the apex. Extent of caudal fin pigmentation, 1% to <25% (29% of specimens), 25% to <75% (57%) or, 75% or more (14%). Caudal fin shape, spade-like. Oral fimbriae, 87-112. Oral papillae, 12-22 (Ref. 89241).

Ease of Identification

Meristic characteristics of Lethenteron camtschaticum

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
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number 2
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total
Adipose fin

Caudal fin

Attributes confluent

Anal fin(s)

Fins number 1
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   
Pelvics Attributes  
Position    
Spines     
Soft-rays   
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