High-resolution Plate 4

Plate 4 All SEM images and adult specimens. Scale bar represents 1 mm. 1–7 Argilloecia cf. robinwhatleyi Yasuhara, Okahashi and Cronin 2009. 1, USNM 594110, PS2200-5, 178 cm; LV, lateral view. 2, USNM 594111, PS2200-5, 178 cm; RV, lateral view. 3, USNM 594112, PS2200-5, 183 cm; RV, lateral view. 4, USNM 594113, PS1913-5, 0–2 cm; LV, internal view. 5, USNM 594114, PS1913-5, 0–2 cm; RV, internal view. 6, USNM 594115, 10/2, 24–26 cm; LV, lateral view. 7, USNM 594116, 10/2, 24–26 cm; RV, lateral view. 8–9 Argilloecia cf. conoidea Sars 1923. 8, USNM 594117, 10/2, 24–26 cm; LV, lateral view. 9, USNM 594118, 10/2, 24–26 cm; RV, lateral view. 10Australoecia posteroacuta Coles and Whatley, 1989, USNM 594119, 10/2, 24–26 cm; RV, lateral view. 11 Argilloecia sp. 1, USNM 594120, 10/2, 24–26 cm; LV, lateral view.