Orbinia Quatrefages 1865
Creators: name: Sun, Yue
name: Li, Xinzheng
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Orbiniida
Orbiniidae
Orbinia

description: Key to species of Orbinia Quatrefages, 1865
1 Branchiae from anterior thoracic chaetigers (usually chaetigers 5–6), thoracic neuropodial postchaetal lobes fimbriated with more than three papillae...Group A........................................................................ 2
- Branchiae from middle and posterior thoracic chaetiger (usually posterior to chaetiger 8), thoracic neuropodial postchaetal lobes only with 1–3 papillae...Group B.................................................................... 14
2 Change in structure of thoracic neuropodial uncini from anterior to posterior of thorax............................... 3
- No distinct change in structure of thoracic neuropodial uncini from anterior to posterior of thorax...................... 4
3 Thorax with 13–16 chaetigers, first 6 chaetigers with rows of uncini and subsequent thoracic chaetigers with rows of subulun- cini................................................................................... Orbinia wui sp. n.
- Thorax with 19 chaetigers, anterior thoracic chaetigers with serrated uncini while posterior chaetigers with smooth uncini............................................................................. Orbinia armandi (McIntosh, 1910)
4 Thorax with 50 chaetigers, thoracic neuropodial uncini smooth, interramal cirri present.......... Orbinia monroi Day, 1955
- Thorax with less than 50 chaetigers, thoracic neuropodial uncini smooth or serrated................................. 5
5 Furcate chaetae present in abdominal notopodia............................................................. 6
- Furcate chaetae absent in abdominal notopodia............................................................. 17
6 Thoracic neuropodial uncini bent but smooth, interramal cirri present.................... Orbinia bioreti (Fauvel, 1919)
- Thoracic neuropodial uncini serrated, with longitudinal median groove, interramal cirri absent.................................................................................................... Orbinia papillosa (Ehlers, 1897)
7 Interramal cirri present................................................................................. 8
- Interramal cirri absent.................................................................................. 9
8 Thorax with 22–24 chaetigers................................................. Orbinia sertulata (Savigny, 1822)
- Thorax with 30–33 chaetigers................................. Orbinia latreillii (Audouin & H Milne Edwards, 1833)
9 Flail chaetae present in abdominal neuropodia, thorax with 21 chaetigers................. Orbinia americana Day, 1973
- Flail chaetae absent in abdominal neuropodia.............................................................. 10
10 Thorax with more than 30 chaetigers..................................................................... 11
- Thorax with less than 30 chaetigers...................................................................... 12
11 Thorax with 35–38 chaetigers, thoracic neuropodial uncini smooth, with lateral sheath....... Orbinia cornidei (Rioja, 1934)
- Thorax with 31 chaetigers, thoracic neuropodial uncini serrated......................... Orbinia swani Pettibone, 1957
12 Without subpodial lobes...................................................... Orbinia exarmata (Fauvel, 1932)
- With subpodial lobes on several chaetigers................................................................. 13
13 Thorax neuropodia with crenulated capillaries............................... Orbinia angrapequensis (Augener, 1918)
- Thoracic neuropodia without capillaries......................................... Orbinia glebushki Averincev, 1990
14 Interramal cirri absent................................................................................. 15
- Interramal cirri present................................................................................ 17
15 Flail chaetae absent in abdominal neuropodia, neuropodial uncini blunt and serrated........ Orbinia johnsoni (Moore, 1909)
- Flail chaetae present in abdominal neuropodia, neuropodial uncini smooth....................................... 16
16 Furcate chaetae absent in abdominal notopodia, with 3–4 capillaries........... Orbinia camposiensis Leão & Santos, 2016
- Furcate chaetae present in abdominal notopodia, with one half row of capillary.............. Orbinia hartmanae Day, 1977
17 Interramal cirri only present in thoracic parapodia.................................... Orbinia orensanzi Blake, 2017
- Interramal cirri only present in abdominal parapodia......................................................... 18
- Interramal cirri present in thoracic and abdominal parapodia................................................... 19
18 Stomach papillae forming ventral fringe on chaetigers 15–17...................... Orbinia vietnamensis Gallardo, 1968
- Stomach papillae present on first 3 abdominal chaetigers, numbering only up to 8......................................................................................... Orbinia oligopapillata López, Cladera & San Martín, 2006
19 Furcate chaetae absent in abdominal notopodia........................................... Orbinia dubia Day, 1955
- Furcate chaetae present in abdominal notopodia............................................................ 20
20 Thorax with 24–27 chaetigers, branchiae from chaetiger 11–13......................... Orbinia dicrochaeta Wu, 1962
- Thorax with 19 chaetigers, branchiae from chaetiger 10.............................. Orbinia riseri (Pettibone, 1957)
description: Published as part of Sun, Yue & Li, Xinzheng, 2018, Orbinia wui, a new species from China, with redescription of O. dicrochaeta Wu, 1962 (Annelida, Orbiniidae), pp. 351-364 in Zootaxa 4403 (2) on pages 362-363, DOI: 10.11646/zootaxa.4403.2.7, http://zenodo.org/record/1212316