Trochosodon, Canu and Bassler, 1927

Bock, Philip E. & Cook, Patricia L., 2004, A review of Australian Conescharellinidae (Bryozoa: Cheilostomata), Memoirs of Museum Victoria 61 (2), pp. 135-182 : 142

Key to Australian species of Trochosodon

1. Colonies large, diameter 3–4.7 mm ............... 2

— Colonies smaller............................. 3

2. Colonies fairly flat, domed centrally, with numerous tubular marginal peristomes............. T. ampulla

— Colonies lenticular, with prominent radial rows of peristomes with paired avicularia on the antapical surface; root pores lunate....................... T. diommatus

3. Colony diameter 2–3 mm ...................... 4

— Colony diameter <2 mm ....................... 5

4. Colonies with bilabiate marginal peristomes, orifices quincuncial with wide, shallow sinus; ovicells symmetrical, root pores lunate..................... T. fecundus

— Colonies with short, tubular peristomes, orifices radial, sinus rounded; adapical pores asymmetric, root pores circular......................... T. asymmetricus

5. Colonies conical, higher than wide; zooid peristomes prominent and curved; root pores rare, lunate T. anomalus

— Colonies as wide as high, or wider................ 6

6. Colonies very small, fairly flat, stellate; peristomes tubular, with paired lateral avicularia; root pores lunate. T. aster

— Colonies minute, with an antapical dome of mamillate calcification; peristomes tubular, with paired lateral avicularia; ovicells small, robust, symmetrical; root pores rounded............................. T. praeco x