Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Lateral spine
(ls)
very prominent
Lateral spine
(ls)
not large and conspicuous
Taxonomy
Phylum
Arthropoda
Subphylum
Crustacea
Class
Maxillopoda
Subclass
Copepoda
Order
Calanoida
Family
Diaptomidae