Siphonotretoidea Kutorga, 1848

Holmer, Lars E. & Biernat, Gertruda, 2002, Urban and Peri-urban small and medium-size Enterprise Development for sustainable Vegetable Production and Marketing Systems, Acta Palaeontologica Polonica 47 (1), pp. 141-156 : 146-147

Superfamily Siphonotretoidea Kutorga, 1848 Family Siphonotretidae Kutorga, 1848 Genus Siphonobolus Havlíček, 1982

Type species: Siphonotreta simulans Ruzička, 1927 ; Ordovician

Trenice Formation (Tremadoc?); Holoubkov, Bohemia.

Fig. 5. A–E. Acanthambonia sp. A . A, D.

Ventral valve RM Br133786, interior (A,

× 33) and oblique lateral view (D, × 48). B,

C, E. Ventral valve RM Br133787, exterior

(B, × 28), oblique lateral view (C, × 40) and detail of larval shell and pedicle opening (E,

× 170). F–M. Acanthambonia ? sp. B. F, K.

Dorsal valve RM Br133788, exterior (F,

× 30) and oblique lateral view (K, × 38).

G, H, I, J, M. Ventral valve RM Br133789,

exterior (G, × 30), posterior view (H, × 32),

oblique lateral view (I, × 32), detail of larval shell and pedicle opening (J, × 100) and posterior view of larval shell (M, × 110). L. Dorsal valve RM Br133790, exterior, × 78. All specimens from the Tremadoc chalcedonites,

Wysoczki.