Orbinia camposiensis, Leão, Luciana Sanches Dourado & Santos, Cinthya Simone Gomes, 2016

Leão, Luciana Sanches Dourado & Santos, Cinthya Simone Gomes, 2016, Orbinia (Polychaeta: Orbiniidae) from the Brazilian coast: two new species and two new records, Zootaxa 4105 (2), pp. 145-158 : 150-152

publication ID	https://doi.org/10.11646/zootaxa.4105.2.3
publication LSID	lsid:zoobank.org:pub:B77497BD-FF55-4097-A76B-AFD24D99E9B6
DOI	https://doi.org/10.5281/zenodo.6070987
persistent identifier	https://treatment.plazi.org/id/4D7E878A-BF78-F92E-FF2D-4B81FBCFFDFA
treatment provided by	Plazi (2016-04-20 07:00:23, last updated 2023-10-30 06:35:37)
scientific name	Orbinia camposiensis
status	sp. nov.

Treatment

Orbinia camposiensis View in CoL n. sp.

Figures 4 View FIGURE 4 A–E; 5 A–E

Type material. Total: 5 specimens. Holotype: Hab. 11; PLAT. F1; Rep. 0 3 (MNR/JP767), 22º 40′S 41º 20″W. Depth: 50 m. Paratypes: Hab. 13; FOZ 12; Rep. 2 (1spec., MNRJ /P768), 22o 40′S 40o 40″W. Depth: 25 m; Hab. 11; PLAT. E2; Rep. 0 2 (2 spec., MNRJ /P765), 22o 40′S 40o 40″W. Depth: 25 m; Hab. 13; PLAT. H1; Rep. 0 1 (1 spec., MNRJ /P766), 22º 0′S 40º 40″W. Depth: 25 m.

Diagnosis. Prostomium conical and pointed; 15–19 thoracic chaetigers. Branchiae from chaetigers 9–13. Papillae present in posterior thoracic and first two abdominal parapodia. Subpodial lobes present. Flail-tipped chaetae present. Furcate chaetae absent.

Description. All specimens incomplete, ranging from 3.7 to 13 mm in total length and with 33 to 62 chaetigers. Holotype 13 mm long, with 62 chaetigers. Prostomium conical and pointed ( Fig. 4 View FIGURE 4 A), width 0.15 mm and height 0.1 mm. Peristomium with one ring. Anterior thoracic region (chaetigers 1–3) 0.75 mm long. First abdominal chaetiger 1 mm wide.

Thorax dorsoventrally compressed, with 19 chaetigers. Branchiae from chaetiger 12 ( Fig. 4 View FIGURE 4 A), abdominal branchiae twice as long as thoracic branchiae. Single post-chaetal lobe of thoracic notopodia, elongate and present from chaetiger 1 ( Fig. 5 View FIGURE 5 B). Thoracic neuropodia with one papilliform lobe from chaetiger 12 ( Fig. 4 View FIGURE 4 B). One subpodial papilla on chaetiger 18 ( Fig. 4 View FIGURE 4 B) and two on chaetiger 19. Abdomen cylindrical. Abdominal notopodia with one postchaetal lobe ( Fig. 4 View FIGURE 4 C); abdominal neuropodia bilobate, with dorsal lobe longer than ventral one ( Figs. 4 View FIGURE 4 E; 5C); four ventral papillae only on the first two abdominal chaetigers ( Fig. 4 View FIGURE 4 C). Long subpodial lobe on the remaining parapodia.

Thoracic notochaetae with crenulated capillaries (10–15); abdominal notochaetae with crenulated capillaries (5–7). Thoracic neurochaetae with three rows of smooth uncinate spines accompanied by 3–4 crenulated capillaries; abdominal neurochaetae with crenulated capillaries (4–5) and flail-tipped chaetae (1–2) ( Fig. 4 View FIGURE 4 D).

Etymology. The specific name ″ camposiensis ″ refers to the type locality.

Occurrence. Southeast Brazil. Depths: 25 and 50 m.

Remarks. Among all the species recorded for the Brazilian coast Orbinia camposiensis n.sp. most resembles Orbinia latreiili ( Audouin & Milne Edwards 1833) , reported from La Rochelle ( France) and Gulf of Naples ( Italy), based on the presence of papillae extending from the thorax to the abdomen and subpodial lobes. However, they differ in the number of thoracic chaetigers (19 and 36 for O camposiensis n.sp. and O. latreilli , respectively), and distribution of ventral papillae, which in O. latreilli form a continuous row of papillae on the thoracic region. Orbinia camposiensis n. sp. is also similar to Orbinia hartmanae ( Day 1977) , described from the coasts of Australia, in the number of thoracic chaetigers, the position of the first pair of branchiae, the arrangement of the papillae and the presence of subpodial lobes. However, O. camposiensis n.sp. does not have abdominal furcate chaetae as found in O. hartmanae . Orbinia camposiensis n.sp. is also similar to Orbinia johnsoni ( Moore 1909) , recorded from California and Campos Basin, in the number of thoracic chaetigers (15–19) and the distribution of papillae, but O. johnsoni has furcated chaetae. The depth occurrence range for O. camposiensis n. sp. was between 25 and 50 m. Orbinia camposiensis n.sp. was recorded at greater depths than O. latreilli and O. johnsoni ( Fauvel, 1927, Hartman, 1944), but similar to records for O. hartmanae (60 m; Day, 1977).

References

Audouin, J. V. & Milne Edwards, H. (1833) Classification des Annelides et description de celles qui habitent les cotes de la France. Annales des Sciences Naturelles, Paris, Serie 1, 29, 388 - 412. http: // dx. doi. org / 10.5962 / bhl. part. 8010

Day, J. H. (1977) A review of the Australian and New Zealand Orbiniidae (Annelida: Polychaeta). In: Reish, D. J. & Fauchald, K. (Eds.), Essays on Polychaetous annelids in memory of Dr. Olga Hartman. The Allan Hancock Foundation, University of Southern California, Los Angeles, California, pp. 217 - 246.

Fauvel, P. (1927) Polychaetes Sedentaries. Addenda aux Errantes, Archiannelides, Myzostomaires. In: Faune de France. Vol. 16. Chevalier. Paris, pp. 1 - 494.

Hartman, O. (1944) Polychaetous annelids from California, including the descriptions of two new genera and nine new species. Allan Hancock Pacific Expeditions, 10 (2), 239 - 307.

Moore, J. P. (1909) Polychaetous annelids from Monterey Bay and San Diego, California. Proceedings of the Academy of Nature Sciences of Philadelphia, 61, 235 - 295.

Figures

FIGURE 4. Orbinia camposiensis n. sp: A: Anterior end, dorsal view, B: Thoracic neuropodium, chaetiger 18, with uncini and crenulated capillaries; arrows indicate post-chaetal lobe and papillae. C: Abdominal neuropodia, chaetigers 20, 21 and 22 with papillae. D: Flail-tipped neurochaeta of abdominal parapodium, chaetiger 30. E: Bilobate and subpodial lobe of abdominal neuropodium, 30 th parapodium.

FIGURE 5. Orbinia camposiensis: A: Anterior end, dorsal view; B: Thoracic parapodium, chaetiger 6; C: Abdominal parapodium, chaetiger 25; D: Abdominal neuropodial uncini, chaetiger 20; E: Camerated capillary notochaeta.