March, 2000 
SCAMIT Newsletter 
Vol. 18, No. 11 
Table B. The following characters may be used to differentiate between Ampelisca brevisimulata 
and Ampelisca cf brevisimulata. (Characteristics of the first coxa and third uropod were later 
found to be unreliable.) 
Characters 
Ampelisca. brevisimulata 
Ampelisca cf brevisimulata 
coxae 1 
postero-ventral tooth strong 
(see below) 
postero-ventral tooth short 
Pereopod 5 
posterior margin of basis 
with 4—6 short, stout spines 
posterior margin of basis 
with few setae (spines 
absent) 
PI eon 2 
postero-ventral margin 
with acute tooth 
postero-ventral margin 
rounded 
Uropod 3** 
long setae, equally dense 
along dorsal and ventral 
margins 
long setae dense dorsally, 
but sparse or absent 
ventral 1 y 
Table C. Characters which may be used to differentiate between Byblis veleronis and B. millsi. 
Characters 
Coxae 1-3 ventral margin 
Uropod 1 outer ramus 
Uropod 2 length 
Overall size 
Depth distribution 
Byblis veleronis 
strongly oblique 
w/ many lateral setae 
subequal to uropod 1 
larger species 
(10- 14 mm) 
deeper 100+ m 
Byblis millsi 
obliquely rounded 
w/ few, small lateral spines 
shorter than uropod 1 
smaller species 
(8 - 10 mm) 
shallower 40 - 100 m 
