Aglaophenia pluma var. sibogae Billard, 1913 accepted as Aglaophenia sibogae Billard, 1913 (original description)
Aglaophenia postdentata Billard, 1913 (original description)
Cladocarpus multiapertus Billard, 1911 (redescription)
Cladocarpus sibogae Billard, 1911 (redescription)
Gymnangium hians var. balei (Marktanner-Turneretscher, 1890) accepted as Gymnangium balei (Marktanner-Turneretscher, 1890) accepted as Gymnangium hians (Busk, 1852) (additional source)
Halicornaria Allmani var. sibogae Billard, 1913 accepted as Gymnangium sibogae (Billard, 1913) (original description)
Halicornaria gracilicaulis (Jäderholm, 1903) accepted as Taxella gracilicaulis (Jäderholm, 1903) (basis of record)
Halicornaria gracilicaulis var. armata Billard, 1913 accepted as Taxella gracilicaulis (Jäderholm, 1903) (original description)
Halicornaria hians (Busk, 1852) accepted as Gymnangium hians (Busk, 1852) (basis of record)
Halicornaria intermedia Billard, 1913 accepted as Taxella longicornis (Busk, 1852) (original description)
Halicornaria longicornis (Busk, 1852) accepted as Taxella longicornis (Busk, 1852) (basis of record)
Halicornaria longicornis var. sibogae Billard, 1913 accepted as Taxella longicornis (Busk, 1852) (original description)
Lytocarpia acuta Stechow, 1923 (additional source)
Lytocarpia orientalis (Billard, 1908) (redescription)
Lytocarpus sibogae Billard, 1913 accepted as Macrorhynchia sibogae (Billard, 1913) accepted as Macrorhynchia phoenicea (Busk, 1852) (original description)
Monostaechas sibogae Billard, 1913 (original description)
Plumularia bedoti Billard, 1911 accepted as Polyplumaria bedoti (Billard, 1911) (redescription)
Plumularia buskii var. peculiaris Billard, 1913 accepted as Halopteris peculiaris (Billard, 1913) (original description)
Plumularia campanuloides Billard, 1911 (redescription)
Plumularia concava Billard, 1911 accepted as Halopteris concava (Billard, 1911) (redescription)
Plumularia crassa Billard, 1911 accepted as Halopteris crassa (Billard, 1911) (redescription)
Plumularia crater Billard, 1911 (redescription)
Plumularia habereri var. attenuata Billard, 1913 accepted as Plumularia habereri Stechow, 1909 accepted as Dentitheca habereri (Stechow, 1909) (original description)
Plumularia habereri var. elongta Billard, 1913 accepted as Plumularia elongata Billard, 1913 (original description)
Plumularia habereri var. mediolineata Billard, 1913 accepted as Plumularia elongata Billard, 1913 (original description)
Plumularia habereri var. mucronata Billard, 1913 accepted as Plumularia habereri Stechow, 1909 accepted as Dentitheca habereri (Stechow, 1909) (original description)
Plumularia habereri var. subarmata Billard, 1913 accepted as Plumularia elongata Billard, 1913 (original description)
Plumularia insignis var. conjuncta Billard, 1913 accepted as Plumularia conjuncta Billard, 1913 (original description)
Plumularia insignis var. gracilis Billard, 1913 accepted as Plumularia billardi Ansín Agís, Ramil & Calder, 2016 (original description)
Plumularia jedani Billard, 1913 accepted as Halopteris jedani (Billard, 1913) (original description)
Plumularia kossowskae Billard, 1911 accepted as Polyplumaria kossowskae (Billard, 1911) (redescription)
Plumularia orientalis Billard, 1911 (redescription)
Plumularia polymorpha Billard, 1913 accepted as Halopteris polymorpha (Billard, 1913) (original description)
Plumularia polymorpha var. sibogae Billard, 1913 accepted as Halopteris longibrachia Calder & Faucci, 2021 (original description)
Plumularia strobilophora Billard, 1913 (original description)
Polyplumaria sibogae Billard, 1913 (original description)
Sibogella erecta Billard, 1911 (redescription)
Thecocarpus myriophyllum var. angulatus Billard, 1913 accepted as Lytocarpia orientalis (Billard, 1908) (original description)

Arafura Sea for Plumularia polymorpha var. sibogae Billard, 1913 
Ceram Sea for Cladocarpus sibogae Billard, 1911 
Ceram Sea for Plumularia kossowskae Billard, 1911 
Ceram Sea for Plumularia orientalis Billard, 1911 
East Timor part of the Timor Sea for Lytocarpia acuta Stechow, 1923 
Flores Sea for Plumularia crater Billard, 1911 
Sulu Sea for Plumularia habereri var. subarmata Billard, 1913 
Sulu Sea for Polyplumaria sibogae Billard, 1913 

 Status

 for Plumularia campanuloides Billard, 1911

Type specimens sterile [details]

 Taxonomic remark

 for Halopteris polymorpha var. sibogae (Billard, 1913)

Cannot be promoted to subspecies status as it is sympatric with nominal species. This is either a distinct species ... [details]

 Type locality

 for Aglaophenia sibogae Billard, 1913

Syntypes 3°27’S, 117°36’E, 59m; 1°42.5’S, 130°47.5’E, 32 m (Indonesia) [details]

 Type locality

 for Gymnangium sibogae (Billard, 1913)

Indonesia, Kei Islands, Tual, 22 m depth. [details]

 Type locality

 for Plumularia campanuloides Billard, 1911

Lirung, Salibabu Island, Indonesia; depth 36 m; substrate hard sand and mud [details]

 Type locality

 for Plumularia conjuncta Billard, 1913

Indonesia, Sulu Sea, 5.7250°N 119.6667°E, 522 m [details]