Kirkegaardia nupem, Freitas & Ribeiro & Ruta, 2022

Freitas, Roberta, Ribeiro, Rannyele Passos & Ruta, Christine, 2022, Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species, PLoS ONE (e 0265336) 2016 (5), pp. 1-27 : 17-19

publication ID	https://doi.org/ 10.1371/journal.pone.0265336
DOI	https://doi.org/10.5281/zenodo.14287244
persistent identifier	https://treatment.plazi.org/id/E87587E4-9240-FFF5-FDD6-C7B8FC807B81
treatment provided by	Felipe
scientific name	Kirkegaardia nupem
status	sp. nov.

Treatment

Kirkegaardia nupem sp. nov.

urn:lsid:zoobank.org:act:61CADA34-741B-4321-B8E0-1A170BE2937C .

Fig 9 View Fig 9

Material examined. BRAZIL: Campos Basin – Holotype – -19.60158333˚S -39.17581389˚W, 1010 m, 21/04/12, ( MNRJP-003003 ); GoogleMaps Paratypes – -19.60158333˚S -39.17581389˚W, 148 m, one ind., 24/01/12, ( MNRJP-003004 ); GoogleMaps -19.95888889˚S -39.89185833˚W, 43 m, one ind., 16/12/10, ( MNRJP-003005 ); GoogleMaps -21.39441667˚S -40.26077778˚W, 88 m, one ind., 21/07/09, ( MNRJP-003006 ); GoogleMaps -21.38483333˚S -40.25302778˚W, 140 m, one ind., 21/07/09, ( MNRJP-003007 ). GoogleMaps

Diagnosis. Peristomium smooth, without rings, with peristomial crest. First pair of branchiae postero-lateral to the tentacles first setiger; branchiae present up to pre-pygidial segments. Noto and neurosetae denticulated. Pre-pygidial segments not expanded.

Description. Complete holotype with 80 setigers, 8.0 mm long, 0.10 mm wide in the thoracic region, and 0.12 mm wide in abdominal region. Prostomium short conical ( Fig 9A View Fig 9 ); eyes absent. Peristomium smooth, without rings, with peristomial crest along entire length ( Fig 9A View Fig 9 ). Dorsal tentacles medial, closely spaced on posterior border of peristomium ( Fig 9A View Fig 9 ). First pair of branchiae postero-lateral to the tentacles and dorsal to notosetae on setiger 1; second pair of branchiae in same location on following setigers ( Fig 9A View Fig 9 ); branchiae present up to pre-pygidial segments. Thoracic region narrow with 9–14 setigers, without dorsal groove ( Fig 9A View Fig 9 ). Abdominal segments wider than long ( Fig 9B View Fig 9 ) but longer than wide in some specimens. Parapodia with poorly developed lobes, difficult to see with optical microscopy. Thoracic parapodia with 4–6 noto- and neurosetae capillary per segment. Posterior abdominal parapodia with 5–7 denticulated capillary notosetae with long filamentous tips ( Fig 9C and 9D View Fig 9 ) and 14–16 heavy spinous denticulated neurosetae per segment ( Fig 9C–9E View Fig 9 ). Denticulated neurosetae first appearing between abdominal setigers 27 and 31. Abdominal neurosetae larger than those in pre-pygidial segments. Pre-pygidial segments not expanded ( Fig 9B View Fig 9 ). Pygidium with a ventral lobe ( Fig 9B View Fig 9 ).

Remarks. Kirkegaardia nupem sp. nov. is similar to K. carrikeri (Dean & Blake, 2009) [ 38] by the conical shape of the prostomium, presence of the peristomial crest, positioning of the dorsal tentacles in the posterior portion of the peristomium, by the first pair of branchiae from setiger 1, and by the presence of a shallow ventral groove in the pre-pygidial region. Kirkegaardia nupem sp. nov. differs from K. carrikeri in that it does not have annulations in the peristomium. The number of noto- and neurosetae in the abdominal region differs between species; K. carrikeri has from 2 to 4 neurosetae in the posterior abdominal region, whereas K. nupem sp. nov. has from 14 to 16 neurosetae in the posterior abdominal segments. Kirkegaardia carrikeri has only denticulated neurosetae throughout the abdominal region, while K. nupem sp. nov. has denticulated noto- and neurosetae in the abdominal region. Pre-pygidial segments of K. nupem sp. nov. resembles K. cryptica (Blake, 1996) [ 2] due to the presence of ventral groove, but K. cryptica has the first pair of branchiae present postero-lateral to the tentacles on the peristomium, while K. nupem sp. nov. has the first pair of branchiae on setiger 1. For all these characteristics, the species was considered as new to science.

Etymology. The epithet is a reference to the Institute of Biodiversity and Sustainability ( NUPEM / UFRJ) acronym, where the beginning of this taxonomic work was developed. Institution recognized for its quality in undergraduate and graduate education, and in the production of scientific knowledge.