REVISION OF SIMOCEPHALUS DAPHNIIDAE 
Fig. 57 Key to S. (Aquipiculus). Numbers correspond with couplets in the key. 
10. 
Wile 

iS: 

S. lusaticus 



S. latirostris 
Fig. 57. 2 & Oo’: No lateral prominences on valves (B) .........::.:00000: 2) 
Fig. 57. 2: Rostrum very long, its lateral margin elevated above central 
part (C). Dorso-posterior valve prominence pointed (D). Occurs in 
BU OULUENPANIME LCA a2. .vscecssssicansteasterceiseaseetetece S. latirostris Stingelin, 1906 
Fig. 57. 2: Rostrum of moderate size, its lateral margin below central 
part (E). Dorso-posterior valve prominence rounded (F). Occurs in 
Australia, Malay Archipelago, Asia and Africa. ..........ccceceeseeeneeeees 
SR ceraiarssccvacssneataesterscusasoatecassute S. heilongjiangensis Shi, Shi, 1994 
Fig. 58. 9: Frons rounded (A). One supra-anal angle (B)............... 1] 
Fig. 58.2: Frons pointed (C). Two supra-anal angles (D) 
BM (CLGULLT OST ALES) SPECIES, SLOP) .cecascesscaecscefaeseccce 2-e-es-nseneeteteeooecace 14 
Fig. 58. 2: Ventral head margin very convex (E). Spines of basal pecten 
of postabdominal claw well-spaced (F). Occurs in New-Zealand 
PRR cn nso astaa cer evasaakesv eevee S. obtusatus (Thomson, 1878) 
Fig. 58.9: Ventral head margin almost straight (G). Spines of basal 
pecten of postabdominal claw close-set (H) .........:eccceseeeseeseeeeeee 12 
Fig. 58. 9 : Dorso-posterior valve angle with large pointed prominence 
(Occurs stay AmmertGai ects ose secede cere S. daphnoides Herrick, 1883 
Fig. 58. 9: Dorso-posterior valve angle with rounded prominence or 
VPMELTOLULE TORO OAMIT EINES: (()) le scncceccessaconece ho aecoccedoaseceeccuproes oo SbauRoeNeAocEEeRCE 13 
Fig. 58.9: Basal pecten of postabdominal claw of 8-12 spines of 
MOIETIES SIVA. (O59) rncccacoocscencopenntenarenseen S. exspinosus (De Geer, 1778) 
Fig. 58. 9: Basal pecten of postabdominal claw of 20-25 small spines 
(L). Occur in Europe and Asia .................- S. congener(Koch, 1841) 

Si 


S. heilongjiangensis 

Fig. 58. 9 : Dorso-posterior valve angle smooth, rounded, without promi- 
nence (M). Occurs in Australia .............. S.victoriensis Dumont, 1983 
Fig. 58. 2 : Dorso-posterior valve angle with distinct prominence covered 
watinidemtiel esi (IN) ie sececesce ccoqecxssuay eeate sc ovevonteecase cuca beesvasesvanot moseseoeeses 15 
Fig. 58.2: Dorso-posterior valve prominence separated above and 
below by deep, wide depressions. Diameter of circle inscribed in it 
moderate (O). Occurs in Africa ..............00- S. brehmi Gauthier, 1939 
Fig. 58.9: Dorso-posterior valve prominence separated above and 
below by shallow, wide depressions. Diameter of circle inscribed in it 
larcer (2) aOccurs inrAustraliavandiAstatee scorer eeece ee ceeeree eee 
Fig. 58.9: Dorso-posterior valve prominence separated above and 
below by deep, narrow depressions. Diameter of circle inscribed in it 
small (Q). Occurs in North America .......... S. rostratus Herrick, 1884 
Fig. 59.2: Ocellus elongate. Frons without denticles (A). Occurs in 
SINCE CAVERN a oat ees cee ans ci veanceceeeep ie gaan ate cues S. mirabilis sp. nov. 
Fig. 59. 2: Ocellus short. Frons with denticles (B) .........:..:::cc00 17 
Fig. 59. 9 : Dorso-posterior valve prominence large, separated from rest 
of valves by deep embayments (C). Its length exceeds diameter of circle 
inscribed in its contour (D). Denticles cover ventral, posterior and more 
than 1/3 of dorsal margin. 0.0.2.0. S. serrulatus (Koch, 1841) 
Fig. 59. 2 : Dorso-posterior valve prominence small, separated from rest 
of valves by shallow embayments (E). Its length less than diameter of 
circle inscribed in its contour (F). No denticles on ventral margin. 
Denticles cover less than ¥2 of posterior and less than 1/3 of dorsal 
margin. Occurs in South America ............. S. semiserratus Sars, 1901 
