Morfologische gegevens van Lampetra fluviatilis
Determinatiesleutels
Abnormalities
Hoofdreferentie Allardi, J. and P. Keith, 1991
Uiterlijke beschrijving verwijst naar
Bones in OsteoBase

Geslachtskenmerken

Gespecialiseerde organen no special organs
Verschillende uiterlijke vorm males alike females
Verschillende kleuren males alike females
Opmerkingen

Beschrijvende kenmerken van juveniel en adult

Opvallende kenmerken striking type of mouth
Laterale lichaamsvorm eel-like
Dwarsdoorsnede circular
Dorsaal kopprofiel clearly convex
Type ogen more or less normal
Type muil/snuit sucker-like
Positie van de muil sub-terminal/inferior
Type of scales scales embedded or partly/completely absent
Diagnose

It is jawless with a round sucker-like mouth and has an outer circle of small teeth and an inner circle of large teeth (Ref. 88171). It has a typical eel-like shape with 2 dorsal fins and 7 gill openings behind the eye. It lacks paired fins. Young adults are uniformly greyish in colour. As it ages, the river lamprey becomes greenish-brown dorsally, golden yellow along the sides and white ventrally (Ref. 58137). In coastal waters of Germany, it can be confused with the sea lamprey (Petromyzon marinus), which is distinguished by having its teeth arranged in many consecutive circular rows (Ref. 88171). Other diagnostic features: Adults 8.6-49.2 cm TL. Body wet weight in individuals 18.0-49.2 cm TL, 30-150 g. Body proportions, as percentage of TL (based on 48 specimens measuring 10.8-38.6 cm TL): prebranchial length, 10.0-12.9; branchial length, 7.9-11.3; trunk length, 46.2-54.3; tail length, 24.1-30.3; eye length, 1.4-3.1; disc length, 4.6-7.0. Urogenital papilla length, as a percentage of branchial length, in 19 spawning males measuring 19.7-28.3 cm TL, 15.9-37.5. Trunk myomeres, 58-66. Dentition: marginals, 70-95; supraoral lamina, 2 unicuspid teeth; infraoral lamina, 5-9 either all unicuspid teeth or, more frequently, the lateralmost are bicuspid and the internal ones unicuspid; 3 endolaterals on each side; endolateral formula, typically 2-3-2, rarely 1-3-2 or 2-3-1; 1-2 rows of anterials; first row of anterials, 4-7 unicuspid teeth; exolaterals absent; posterials absent; transverse lingual lamina, 8-18, usually 12-14, unicuspid laminae straight or parentheses-shaped and each with 9-13 unicuspid teeth. Marginal membrane present. Velar tentacles, 4-10, with tubercles; no velar wings. Body coloration in recently metamorphosed individuals silvery; in preserved upstream migrants, bluish brown or lead gray on the dorsal aspect tending towards silvery on the lateral aspects and whitish or yellowish on ventral aspect. Early upstream spawning migrants returning from the sea have a bronze sheen. Dorsal fins of maturing individuals may have a purplish tint. Iris is golden yellow. Body coloration in the landlocked population in Lake Ladoga is completely black. Lateral line neuromasts unpigmented or darkly pigmented. Extent of caudal fin pigmentation, absent or trace in young adults and 75% or more in spawning individuals. Caudal fin shape, spade-like. Oral fimbriae, 84-112. Oral papillae, 11-20 (Ref. 89241).

Gemak van identificatie likely to be confused with closely related species.

Meristieke kenmerken van Lampetra fluviatilis

Laterale lijnen Onderbroken: No
Aantal schubben op laterale lijn 0 - 0
Aantal geperforeerde schubben op laterale lijn 0 - 0
Aantal schubben in lateral serie 0 - 0
Aantal rijen schubben boven laterale lijn 0 - 0
Aantal rijen schubben onder laterale lijn 0 - 0
Aantal schubben rond staartsteel 0 - 0
Baarddraden 0
Kieuwspleten (enkel bij haaien en roggen) 7
Kieuwdoornen
op onderste gedeelte
op bovenste gedeelte
totaal
Wervels
preanaal
totaal

Vinnen

Dorsale vin(nen)

Eigenschappen no striking attributes
Aantal vinnen 2
Aantal bijvinnen Dorsal   0 - 0
Ventral  0 - 0
Totaal aantal stekels 0 - 0
Totaal aantal zachte vinstralen
Vetvin absent

Staartvin

Eigenschappen pointed; confluent

Anale vin(nen)

Aantal vinnen
Totaal aantal stekels 0 - 0
Totaal aantal zachte vinstralen 0 - 0

Pare vinnen

Pectorale vinnen Eigenschappen  absent
stekels     0
Zachte vinstralen   0 - 0
Pelvische vinnen Eigenschappen  suppressed/absent
Positie    absent
stekels     0
Zachte vinstralen   0 - 0
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