Morfologiska data för Rhabdalestes septentrionalis
Bestämningsnycklar
Abnormalities
Main Ref. Paugy, D. and S.A. Schaefer, 2007
Utseende refererar till
Bones in OsteoBase

Könskaraktärer

specialiserade organ no special organs
annat utseende always different morphology between mature adults
andra färger
Anmärkningar Very pronounced sexual dimorphism affecting anal-fin shape in adult males (Ref. 2880, 81279).

Karaktäristiska egenskaper hos juveniler och adulter

Särskilt slående egenskaper none
Lateral kroppsform fusiform / normal
Tvärsnitt
Dorsal profil av huvudet more or less straight
Ögontyp more or less normal
Typ av mun/snyte more or less normal
Munnens placering terminal
Type of scales cycloid scales
Diagnos

Diagnosis: lateral line complete (Ref. 80290, 81279) or incomplete (Ref. 2880, 81279). 9-30 pored scales on lateral line (Ref. 81279). 4.5 scales above lateral line; 13-17 anal fin branched rays (Ref. 80290, 81279). 24-30 (Ref. 81279) or 24-27 (Ref. 80290) scales in longitudinal series. 13-17 (Ref. 2880, 81279) or 14-17 (Ref. 80290) gill rakers on lower limb of first gill arch.

Description: big eyes (Ref. 2880). Body slender; body depth 24-29% and head length 24-27% of SL; mouth terminal, lower jaw prominent, its depth about 2x that of upper jaw; premaxilla with 2 teeth in outer row each bearing 3-5 cusps, 4 teeth in inner row each bearing 6 cusps; dentary with 4 teeth in outer row each bearing 3-5 cusps, inner dentary teeth absent; lateral line complete, 23-27 tubes, ultimate canal-bearing scale not terminal, separated from caudal fin rays by 1-2 non canal-bearing scales (Ref. 80290). Anal fin with 3 unbranched and 13-17 branched rays (Ref. 80290, 81279). Very pronounced sexual dimorphism affecting anal-fin shape in adult males (Ref. 2880, 81279).

Coloration: silvery body with brilliant, glossy lateral band along sides, which becomes black after preservation in formalin (Ref. 2880, 81279). Band extends from posterior opercular margin through caudal fin base to margin of median rays; posterior flank immediately above anal fin base with horizontal band reaching to vertical through anus and extending caudad to proximal portion of median anal fin rays (Ref. 80290). Melanophores at anal-fin base much more distinct than visible in Micralestes species (Ref. 2880, 81279). Dorsal midline with dark pigment from head through dorsal and adipose fins to procurrent caudal fin rays; dorsal fin dusky, occasionally with pigment at apical tip (Ref. 80290).

Ease of Identification

Meristiska karaktäristika för Rhabdalestes septentrionalis

Sidolinjer 1 avbruten: No
Fjäll längs sidolinje 24 - 30
Porbärande fjäll längs sidolinje 9 - 30
Fjäll i lateralserie
Antal rader fjäll ovan sidolinje 4.5 - 4.5
Antal rader fjäll under sidolinje 3.5 - 3.5
Fjäll runt stjärtfensspole
Skäggtömmar 0
Gälspringor (endast hos hajar/rockor)
Gälräfständer
på undre del av gälbåge 13 - 17
på övre del av gälbåge
totalt
Ryggkotor
preanal
totalt

Fenor

Ryggfena/fenor

Egenskaper no striking attributes
Antal fenor 1
Antal småfenor Dorsal   
Ventral  
Totalt antal hårda fenstrålar
Totalt antal mjuka fenstrålar
Fettfena present

Stjärtfena

Egenskaper forked; more or less normal

Analfena/fenor

Antal fenor 1
Totalt antal hårda fenstrålar 0 - 0
Totalt antal mjuka fenstrålar 16 - 20

Pariga fenor

Bröstfena Egenskaper  more or less normal
Fenstrålar hårda     
Fenstrålar mjuka   
Bukfenor Egenskaper  more or less normal
Position    abdominal  beneath origin of D1
Fenstrålar hårda     
Fenstrålar mjuka   
Tillbaka till Sök
Comments & Corrections
cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  senast uppdaterad av sortiz, 06.27.17