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A Sternaspis sp. ventral view with some morphological features B Ventro-caudal shields of some Sternaspis species C Shield parts as herein proposed to distinguish different species (AD: anterior depression, FPP: fan posterior projection) (A modif. after Uschakov 1955, reproduced with permission; B–C modified after von Marenzeller 1890).
Variation of the ventro-caudal shield in Sternaspis affinis Stimpson, 1864, station 996 A Four specimens showing size differences B Specimen 1, ventro-caudal shield C Specimen 3, ventro-caudal shield D Specimen 4, ventro-caudal shield E Specimen 2, ventro-caudal shield F Same, ventro-caudal shield showing integument papillae. Bars: A 2 mm, B–F 1 mm.
Sternaspis africana Augener, 1918 n. status, neotype (NHM 1930.10.8.2582-90) A Anterior end, ventral view B Posterior end, oblique lateral view C Posterior region, dorsal view D–F Ventro-caudal shields of three other specimens (IRFA-STE 001). Bars: A 2.2 mm B 1.7 mm C 2.1 mm D–E 0.7 mm F 0.9 mm.
Sternaspis fossor Stimpson, 1853 A Juvenile (HMCS 9953670), anterior end exposed, ventral view B Another specimen (HMCS 9953671), ventro-caudal shield, frontal view C Neotype (USNM 15543), anterior end exposed, ventral view D Same, ventro-caudal shield, frontal view E–F Ventro-caudal shields of three other specimens (USNM 7872). Bars: A, F 1 mm B 0.6 mm C, E 0.8 mm D 0.7 mm G 1.2 mm.
Sternaspis islandica Malmgren, 1867, syntypes (SMNH 5135) A Complete syntype, ventral view B Same, anterior end, frontal view C Same, ventro-caudal shield D Same, posterior region, dorsal view E Non-type specimen (ZMUC), with darker, blackish shield F–H Ventro-caudal shield of other non-type specimens (MNHN). Bars: A 1.2 mm B 1.4 mm C, D 1.3 mm F 0.7 mm G–H 1 mm.
Sternaspis maior Chamberlin, 1919 A Neotype (UNAM 7882), ventral view B Same, lateral view C Same, anterior end, frontal view D Same, ventro-caudal shield E Paraneotype (UNAM Sta. 13), ventro-caudal shield F Paraneotype (UNAM Sta. 13, OH), ventro-caudal shield G Paraneotype (UNAM 7881), ventro-caudal shield. Sternaspis princeps Selenka, 1885, syntypes (NHM 1885.12.3.1) H Larger syntype, median region showing gonopodial lobes I Smaller syntype, ventro-caudal shield, frontal view. Bars: A 1.9 mm B 2 mm C 1 mm D 1.4 mm E 1.3 mm F 1.5 mm G 2.5 mm H, I 1.2 mm.
Sternaspis scutata (Ranzani, 1817), neotype (RBCM 005-140-001) A Anterior end, ventral view B Same, chaetae of first three chaetigers C Same, ventro-caudal shield D Paraneotype, ventro-caudal shield, oblique lateral view showing chaetal bundles E Neotype, posterior region, dorsal view F Another paraneotype, branchiae removed to show branchial plates G–I Non-type specimens (IRFA-STE 015), ventro-caudal shields. Bars: A 1.9 mm B 1.7 mm C, D, F 0.7 mm E, I 1.3 mm G 0.5 mm H 1.1 mm.
Sternaspis thorsoni sp. n. A Holotype (ZMUC 2221), ventral view B Same, anterior end, frontal view C Same, ventro-caudal shield D Mon type specimen (ZMUC Sta. 64), ventro-caudal shield E Paratype (ZMUC 2224), ventro-caudal shield F Another paratype (ZMUC 2223), ventro-caudal shield. Bars: A, F 0.8 mm B 0.6 mm C 0.5 mm D 0.3 mm E 0.4 mm.
Caulleryaspis gudmundssoni sp. n., holotype (IMNH 10280) A Ventral view (arrow points peg chaetae) B Same, ventro-caudal shield (arrow points peg chaetae) C Same, posterior region, lateral view (arrow points peg chaetae). Bars: A 1.4 mm, B 0.8 mm C 0.9 mm (Photos: Gudmundur Vidir Helgason).
Petersenaspis capillata (Nonato, 1966) comb. n., syntypes (MCEM 1333) A Complete, ventral view B Another syntype, anterior end, ventral view C Same, enlargement to show subdistally expanded chaetae D Same, ventro-caudal shield, frontal view E Another syntype, posterior region, dorsal view. Bars: A 1 mm B, D 0.6 mm C 0.4 mm E 0.9 mm.
Petersenaspis palpallatoci sp. n. A Holotype (MNHN 1551), ventral view B Same, anterior end, lateral view C Same, ventro-caudal shield, frontal view D Paratype (MNHN 1552), ventro-caudal shield, frontal view E Same, branchial plate, frontal view, branchiae and papillae removed. Bars: A 1 mm B 0.7mm C 0.3 mm D 0.5 mm E 0.4 mm.
Petersenaspis sp (ZMA 1717) A Complete specimen, ventral view B Same, anterior segments in lateral view C Same, ventro-caudal shield, frontal view, lateral plates forced dorsally D Same, posterior region, dorsal view E Incomplete specimen, lateral view F Same, enlargement of right lateral shield plate. Bars: A 1.2 mm B 0.44 mm C 0.38 mm D 1 mm E 0.9 mm F 0.42 mm.