Caracteres;"O. johnsoni - California";"O. Collaris – California";"Ubatuba – Brazil";"O. caissara – Paranaguá Bay – Brazil";"O. caissara – Babitonga Bay – Brazil";"O. borealis - Iceland";"O. polaris – Norwegian Sea";Portugal;"Seine Bay";"O. fusiformis – Banyuls Bay";"O. persica – Persian Gulf";"Madagascar Tulear";"O. gomsoni – Yellow Sea";"Japan Sea";"West of Australia";"O. mirrawa - Australia";"O. bassensis - Australia";"O. australis - Australia";"O. dichotoma - Australia";"O. picta - Australia";"O. petersenae – New Zealand"
Size;"Branchial lenth (1)";L;M;S;M;M;S;S;M;M;M;L;M;M;S;M;;;;S;M;L
"Thorax length (2)";L;M;M;M;M;M;M;L;M;M;L;M;M;M;M;S;S;S;;;M
"Body width (3)";M;M;L;M;M;M;M;M;M;M;S;L;L;M;S;;;;;;M
"Number of segments (range)";"19 – 20";20;;"13 – 21";"16 – 21";22;"18 – 22";;"19 – 24";"21 – 30";"8 – 23";;"22 – 24";;;14;17;19;;22;
Tentacles;"Number of trunks";4;4;4;5;5;4;4;;4;4;4;4;5;4;4;4;3;4;4;4;4
"Dorsal and Ventral length";≠;≠;=;≠;≠;≠;=;≠;≠;≠;=;≠;≠;=;≠;;≠;=;;=;≠
Collar;Curved;;;;;;;;;*;;;*;*;;*;;;;;;*
Straight;*;*;*;*;*;;;*;;*;;;;*;;*;*;*;*;*;
"With angle";;;;;;*;*;;;;*;;;;;;;;;;
"Slit length: Short, Middle or long";S;M;M;;;M;M;S;S;M;M;S;M;M;M;;;;;;L
Thorax;"Line of 3 thoracic bundles: / or _/";/;_/;/;_/;_/;/;_/;/;_/;_/;_/;/;_/;_/;/;;;;;;_/
"Direction (°) of hooks on abdominal segment 1 (range)";0;"30 – 45";"0 – 45";"0 -90";"0 -90";45;"0 -10";45;"0 -90";"0 – 5";45;"70 -90";"0 -30";"10 -90";45;;;;;;"30 -90"
Hooks;"Length of tooth (X) (4)";M;L;M;M;M;S;M;M;M;M;S;L;M;M;S;;;;;;M
"Length of opening (Y) (5)";M;M;M;M;M;M;M;S;M;M;L;M;M;M;M;;;;;;S
"Ratio X/Z (6)";M;M;M;M;M;S;M;M;M;M;M;M;M;M;M;;;;;;M
"Angle of tooth (7)";S;B;M;S;S;B;B;M;M;M;M;M;S;M;B;;;;;;S
"Dorsal shift present (pr), or absent (ab)";pr;pr;ab;pr;pr;pr;pr;ab;pr;ab;pr;pr;ab;ab;pr;;;;;;pr
"Ventral shift present (pr), absent (ab)";pr+;pr+;pr+;pr;pr;pr;ab;pr;pr;pr;pr;ab;pr;pr;pr;;;;;;pr
"Scales on chaetae";"Length (a + b)/d (8)";M;M;L;L;L;S;M;L;M;M;M;S;M;M;M;;;;;;L
"Sharpness (a/d) (9)";A;A;S;M;M;A;M;S;S;M;M;A;S;M;S;;;;;;S
"Length of free part (c) (10)";L;M;L;M;M;S;M;L;M;M;L;S;S;M;M;;;;;;L
"Transition area: < > or ()";"< >";"< >";();();();"< >";"< >";();"< >";"< >";();();();"< >";();();();();;;()
"Methyl Green Staining";Tentacles;;;–;–;–;+;;;;*;–;;*;–;;;;;;;*
"Dorsal collar";;;*;+;+;+;;;*;;+;;+;;;;;;;;*
"2 ventral lines of thorax";;;–;–;–;–;;;–;–;–;;+;–;;;;;;;–
"V-shaped area from mouth to setiger 2";;;;;;;;;;;;;;;;;;;;;