WoRMS taxon details
Pseudoscalibregma Ashworth, 1901
129554 (urn:lsid:marinespecies.org:taxname:129554)
accepted
Genus
Scalibregma parvum Hansen, 1879 accepted as Pseudoscalibregma parvum (Hansen, 1879) (type by subsequent designation)
Eusclerocheilus Hartman, 1967 · unaccepted (subjective synonym)
- Species Pseudoscalibregma biannulatum Blake, 2025
- Species Pseudoscalibregma bransfieldia (Hartman, 1967)
- Species Pseudoscalibregma ermindae Mendes, De Paiva & Rizzo, 2024
- Species Pseudoscalibregma glandipodium Blake, 2023
- Species Pseudoscalibregma gracile Blake, 2025
- Species Pseudoscalibregma hartmanae (Blake, 1981)
- Species Pseudoscalibregma larae Blake, 2025
- Species Pseudoscalibregma magalhaesi Mendes, De Paiva & Rizzo, 2024
- Species Pseudoscalibregma nybakkeni Blake, 2025
- Species Pseudoscalibregma orientale Imajima, 2009
- Species Pseudoscalibregma pallens Levenstein, 1962
- Species Pseudoscalibregma palmeri Blake, 2015
- Species Pseudoscalibregma papilia Schüller, 2008
- Species Pseudoscalibregma parapari Mendes, De Paiva & Rizzo, 2024
- Species Pseudoscalibregma parvum (Hansen, 1879)
- Species Pseudoscalibregma pigmentum Blake, 2025
- Species Pseudoscalibregma usarpium Blake, 1981
- Species Pseudoscalibregma aciculata Hartman, 1965 accepted as Oligobregma aciculatum (Hartman, 1965) (superseded original combination plus gender agreement correction)
- Species Pseudoscalibregma bransfieldium [auct. misspelling] accepted as Pseudoscalibregma bransfieldia (Hartman, 1967) (unaccepted > misspelling - incorrect subsequent spelling, species-group name 'bransfieldia' is a noun)
- Species Pseudoscalibregma collaris Levenstein, 1975 accepted as Oligobregma collare (Levenstein, 1975) (superseded original combination)
- Species Pseudoscalibregma gracilis Blake, 2025 accepted as Pseudoscalibregma gracile Blake, 2025 (unaccepted > incorrect grammatical agreement of specific epithet, spelling gender correction to correct neuter 'gracile')
- Species Pseudoscalibregma longisetosum (Théel, 1879) accepted as Pseudoscalibregma parvum (Hansen, 1879) (subjective synonym)
- Species Pseudoscalibregma orientalis Imajima, 2009 accepted as Pseudoscalibregma orientale Imajima, 2009 (unaccepted > misspelling - incorrect original spelling, spelling gender correction to correct neuter 'orientale')
- Species Pseudoscalibregma reticulatum (McIntosh, 1885) accepted as Hyboscolex reticulatus (McIntosh, 1885) (unaccepted > superseded combination, superseded subsequent combination)
marine, brackish, fresh, terrestrial
recent only
neuter
Ashworth, James Hartley. 1901. The anatomy of <i>Scalibregma inflatum</i> Rathke. Quarterly Journal of Microscopical Science, London, 45: 237-309., available online at https://www.biodiversitylibrary.org/page/14709616
page(s): 296 [details]
page(s): 296 [details]
Read, G.; Fauchald, K. (Ed.) (2025). World Polychaeta Database. Pseudoscalibregma Ashworth, 1901. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=129554 on 2025-11-10
Date
action
by
The webpage text is licensed under a Creative Commons
Attribution 4.0 License
Nomenclature
original description
Ashworth, James Hartley. 1901. The anatomy of <i>Scalibregma inflatum</i> Rathke. Quarterly Journal of Microscopical Science, London, 45: 237-309., available online at https://www.biodiversitylibrary.org/page/14709616
page(s): 296 [details]
original description (of Eusclerocheilus Hartman, 1967) Hartman, Olga. (1967). Polychaetous annelids collected by the USNS Eltanin and Staten Island cruises, chiefly from Antarctic Seas. <em>Allan Hancock Monographs in Marine Biology.</em> 2: 1-387.
page(s): 130 [details] Available for editors
[request]
page(s): 296 [details]
original description (of Eusclerocheilus Hartman, 1967) Hartman, Olga. (1967). Polychaetous annelids collected by the USNS Eltanin and Staten Island cruises, chiefly from Antarctic Seas. <em>Allan Hancock Monographs in Marine Biology.</em> 2: 1-387.
page(s): 130 [details] Available for editors
[request]Taxonomy
taxonomy source
Blake, James A. (2025). New species and records of Scalibregmatidae (Annelida) from the Atlantic Ocean, Indian Ocean, Pacific Ocean, Southern Ocean, and adjacent seas. <em>Megataxa.</em> 16(1): 1–232., available online at https://mapress.com/mt/article/view/megataxa.16.1.1
page(s): 116; note: Description of five new species and a table of morphological comparison of the 17 Known Species of Pseudoscalibregma Ashworth, 1901 [details]
redescription Bakken, T.; Oug, E.; Kongsrud, J. A. (2014). Occurrence and distribution of<em> Pseudoscalibregma</em> and <em>Scalibregma </em>(Annelida, Scalibregmatidae) in the deep Nordic Seas, with the description of <em>Scalibregma hanseni</em> n. sp. <em>Zootaxa.</em> 3753(2): 101-117., available online at https://doi.org/10.11646/zootaxa.3753.2.1
page(s): 102 [genus emendation] [details] Available for editors [request]
page(s): 116; note: Description of five new species and a table of morphological comparison of the 17 Known Species of Pseudoscalibregma Ashworth, 1901 [details]
redescription Bakken, T.; Oug, E.; Kongsrud, J. A. (2014). Occurrence and distribution of<em> Pseudoscalibregma</em> and <em>Scalibregma </em>(Annelida, Scalibregmatidae) in the deep Nordic Seas, with the description of <em>Scalibregma hanseni</em> n. sp. <em>Zootaxa.</em> 3753(2): 101-117., available online at https://doi.org/10.11646/zootaxa.3753.2.1
page(s): 102 [genus emendation] [details] Available for editors
[request]Identification resource
identification resource
Mendes, Samuel Lucas Da Silva Delgado; De Paiva, Paulo Cesar; Rizzo, Alexandra E. (2024). New species of Pseudoscalibregma Ashworth, 1901 (Annelida: Scalibregmatidae Malmgren, 1867) from Brazil. <em>Zootaxa.</em> 5399(1): 19-36., available online at https://www.mapress.com/zt/article/view/zootaxa.5399.1.2
page(s): 32; note: World key to Pseudoscalibregma [details] Available for editors [request]
page(s): 32; note: World key to Pseudoscalibregma [details] Available for editors
[request]Other
additional source
Fauchald, K. (1977). The polychaete worms, definitions and keys to the orders, families and genera. <em>Natural History Museum of Los Angeles County: Los Angeles, CA (USA), Science Series.</em> 28:1-188., available online at http://www.vliz.be/imisdocs/publications/123110.pdf [details]
additional source Glasby, Christopher J.; Read, Geoffrey B.; Lee, Kenneth E.; Blakemore, R.J.; Fraser, P.M.; Pinder, A.M.; Erséus, C.; Moser, W.E.; Burreson, E.M.; Govedich, F.R.; Davies, R.W.; Dawson, E.W. (2009). Phylum Annelida: bristleworms, earthworms, leeches. <em>[Book chapter].</em> Chapt 17, pp. 312-358. in: Gordon, D.P. (Ed.) (2009). New Zealand inventory of biodiversity: 1. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch. [details] Available for editors [request]
additional source Glasby, Christopher J.; Read, Geoffrey B.; Lee, Kenneth E.; Blakemore, R.J.; Fraser, P.M.; Pinder, A.M.; Erséus, C.; Moser, W.E.; Burreson, E.M.; Govedich, F.R.; Davies, R.W.; Dawson, E.W. (2009). Phylum Annelida: bristleworms, earthworms, leeches. <em>[Book chapter].</em> Chapt 17, pp. 312-358. in: Gordon, D.P. (Ed.) (2009). New Zealand inventory of biodiversity: 1. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch. [details] Available for editors
[request]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Diagnosis Body elongate, arenicoliform. Prostomium T-shaped with frontal horns. Peristomium a single ring, encompassing prostomium dorsally and ventrally forming upper lip of mouth; lower lip of mouth formed from elements of peristomium and chaetiger 1. Parapodia of posterior segments with dorsal and ventral cirri; interramal papillae present; postchaetal lamellae absent. Branchiae absent. chaetae include capillaries, furcate chaetae, and sometimes a few inconspicuous spinous chaetae among capillaries of chaetigers 1–2, blunt, pointed, or bifurcated, representing homologues of furcate chaetae found on following chaetigers; large conspicuous spines absent. Pygidium with long anal cirri. The only character that separates Pseudoscalibregma from Scalibregma is the absence of branchiae. (Blake, 2015: 74; Blake, 2025: 116). [details]Diagnosis As emended (Baaken et al 2014) "Body elongate, posterior part tapering (‘arenicoliform’). Prostomium T-shaped with distinct lateral processes. Posterior parapodia with dorsal and ventral cirri. Branchiae absent. Large acicular spines absent; small thin, pointed or bifurcate spines present in chaetiger 1." The additional character is presence of chaetiger 1 spines. [details]
Grammatical gender The genus is neuter as the last word in the compound genus name, -bregma, is neuter (see for example the derivation of type genus Scalibregma). At least four of the species-group names are appropriately with neuter suffices, including the type species Pseudoscalibregma parvum (Hansen, 1879). Ashworth (1901:296) had no comment on the genus gender, but instead clearly indicated it was neuter by using three neuter species-group names (longisetosum, parvum, reticulatum) [details]
Original description The genus was originally described in a work dated 1901, but published only in 1902. [details]
Type designation Ashworth included three species (previously described) and did not indicate a type species, so the designation must be a subsequent designation. We do not yet have the information on who chose Scalibregma parvum Hansen, 1879, the second species mentioned by Ashworth, and said by him to be perhaps a young form of P. longisetosum (Theel, 1879), the first mentioned species and today treated as a synonym of P. parvum. Blake (2025) states that Ashworth (1901) designated the type species but this is not correct. It might have arisen from the Hartman catalogue which only lists P parvum as the sole species previously placed in the genus (not true). Eumenia reticulata, currently in Hyboscolex, was the third species included by Ashworth. [details]
