FAMILY MALDANIDAE 

 Key to genera and species 



1 Head with a prominent cephalic keel but not surrounded by a 



flattened plate with a raised margin 



1' Head with an inclined dorsal plate surrounded by a raised 

 margin 



2 Pygidium petaloid with a central anus {P( taloproctus). [Body 



including 21 setigers and 2 achaetous preanal segments] . . . 

 2' Pygidium funnel-shaped with margin encircled by cirri (Nico- 

 mache). [A deep pocket above anus] 



3 Neuropodial spines or hooks present in setiger 1. Pygidium 



encircled by anal cirri 



3' No neurosetae in setiger 1. No anal cirri. Pygidium as a flat 

 or concave plate with a dorsal anus above 



4 Anal cone protruding beyond ring of long anal cirri and pro- 



vided with a stout ventral valve (PraxiUella). [Setiger 1 with 

 2 neuropodial spines. Five achaetous preanal segments] . . . . 

 4' Anus sunk in a pygidial funnel rimmed with anal cirri 



5 Setiger 4 with an anterior membranous collar (Clymcm'Ua). 



[Eighteen setigers ])lus 2 achaetous preanal segments. Seti- 

 ger 1 with about 5 neurosetae] 



5' Setiger 4 without a membranous collar 



6 Twenty-five or more setigers. No achaetous preanal segments 



(MdO'och/iiuiie). [Eye spots on prostomium. Setigers 1-3 



with 1-3 neuropodial spines] 



6' Twenty-one or fewer setigers. Achaetous preanal segments 

 present 



7 Setiger 1 with 4 or more neuropodial hooks similar to those 



in setiger 4 {A.riotliilld). 1 18 setigers and 2 achaetous pre- 

 anal segments] 



7' Setigers 1-3 with 1-3 neuropodial spines bearing vestigial 

 denticles or none and ([uite unlike hooks of setiger 4 

 (Eiichjitiinic) 



8 Segments 7-11 dorsally covered with numerous short gill 



filaments {BivHcliioasi/rliis). [19 setigers] 



8' Segments 7-11 without gill filaments. [Cephalic ridge low. 

 cephalic i)late deejily inci.sed laterally (Asi/chis). Margin of 

 cephalic plate smooth. Pygidium with a ventral pocket] 



9 Body of 1!) setigers with numerous blisters or pustules from 



6th onwards. Cephalic rim low laterally and foiming a 



shallow ()ocket posteriorly (.4. clotKjuto) 



9' Body of 18 setigers without blisters or pustules. Cephalic rim 

 high latei-ally and forming a very (Uh']) pocket jxisteriorly 



2 

 3 



P. social is 

 N. trispiiiata 



4 

 8 



Pra.viUclla sp. 

 5 



C. tiirqiuitd 

 6 



M. zonal is 

 7 



.4. mucosa 



No N.C. record 

 B. anicricaiia 



No N.C. record 



A. cnroli)iae 



102 



