Hermundura tricuspis Müller, 1858

Ribeiro, Rannyele Passos, Barbosa, Aline Da Cruz, Freitas, Roberta, Zanol, Joana, Glasby, Christopher J. & Ruta, Christine, 2020, Pilargidae (Annelida: Phyllodocida) from coastal and deep waters of the Southwestern Atlantic, with descriptions of two new species, Zootaxa 4878 (1), pp. 56-76 : 68-71

publication ID	https://doi.org/10.11646/zootaxa.4878.1.2
publication LSID	lsid:zoobank.org:pub:29DB126D-4751-433B-89BC-EFDD421368F7
DOI	https://doi.org/10.5281/zenodo.4574137
persistent identifier	https://treatment.plazi.org/id/03D587F5-FFCA-FFAC-FF22-F91BBB6AF83A
treatment provided by	Plazi (2021-01-07 15:45:57, last updated 2024-11-24 23:38:24)
scientific name	Hermundura tricuspis Müller, 1858
status

Treatment

Hermundura tricuspis Müller, 1858 View in CoL

Figure 9 View FIGURE 9 A–D

Hermundura tricuspis Müller, 1858: 216 View in CoL , pl. 7, figs 19–20.

Parandalia tricuspis Salazar-Vallejo 1990: 512–515 View in CoL , figs 3a–e.

Material examined. BRAZIL: Campos Basin: 21º55’18.918”S, 40º55’0.625”W, 16 m, two specimens, 11.iii.2009 (MNRJP-002741); GoogleMaps 78 m, three specimens, 21.ii.2009 (MNRJP-002742); 23º1’47.127”S, 41º58’29.231”W, 80 m, two specimens, 28.ii.2009 (MNRJP-002743); GoogleMaps State of Espírito Santo: Peroá Cangoá : 19º32’00”S, 39º35’00”W, one specimen ( IBUFRJ0388 ) GoogleMaps . State of Santa Catarina: Itajaí : 26°54′30″S, 48°39′45″W, one specimen ( IBUFRJ1143 ) GoogleMaps .

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Description. Fixed specimens whitish. Largest individual measuring 30 mm long, 0.45 mm wide and 65 chaetigers (MNRJP-002741). Body sub-cylindrical, surface smooth. Prostomium trapezoidal, antennae and eyes absent ( Fig. 9A View FIGURE 9 ). Two palps fused and biarticulated, palpophores large and palpostyles reduced to small papillae. Proboscis not observed. Peristomium set off from prostomium; tentacular cirri absent. Parapodia uniramous in first chaetiger, following parapodia biramous ( Fig. 9A View FIGURE 9 ). Second chaetiger with a pair of subepidermal ocelli. Notopodium reduced to small lobes from chaetiger two ( Fig. 9B View FIGURE 9 ). Notopodial spines present from seventh chaetiger to the end of the body. Neuropodium well developed, ventral cirri present from fourth chaetiger to last. Neurochaetae comprising six capillaries finely hirsute spirally ( Fig. 9B, D View FIGURE 9 ). Segmentation of the posterior region weakly marked; chaetigers gradually longer from chaetiger 15. Pygidium rounded and concave, with three cirri ( Fig. 9C View FIGURE 9 ).

Distribution. Atlantic Ocean—Brazil ( Amaral et al. 2003; Attolini & Tararan 2001; Paiva 1993); Uruguay and Argentina ( Salazar-Vallejo & Orensanz 1991); Argentina, Mar del Plata ( Palacios et al. 2005). Pacific Ocean—Gulf of Nicoya, Costa Rica ( Dean 1998).

Remarks. Hermundura tricuspis resembles H. fauveli but differs in having eyespots and notopodial spines from seventh chaetiger, while H. fauveli has notopodial spines from the ninth chaetiger. Furthermore, H. fauveli has the first five chaetigers with segmentation very marked ( Pettibone 1966); this is absent in specimens examined from this study. All diagnostic characters observed in the specimens of this study confer to the description of the neotypes by Salazar-Vallejo (1990). Additionally, no morphological variation was observed in the material examined.

References

Amaral, A. C. Z., Denadai, M. R., Turra, A. & Rizzo, A. E. (2003) Intertidal macrofauna in Brazilian subtropical tide-dominated sandy beaches. Journal of Coastal Research, Special Issue, 35, 446 - 455.

Attolini, F. S. & Tararan, A. S. (2001) Polychaete spatial distribution in the continental shelf of the Bacia de Campos area, southeastern Brazil. Oceanides, 16 (1), 17 - 32.

Dean, H. K. (1998) The Pilargidae (Annelida: Polychaeta) of the Pacific Coast of Costa Rica. Revista de Biologia Tropical, 46, Supplement 6, 41 - 62.

Muller, F. (1858) Einiges uber die Annelidenfauna der Insel Santa Catharina an der brasilianischen Kuste. Archiv fur Naturgeschichte, 24 (1), 211 - 220.

Paiva, P. C. (1993) Anelideos poliquetas da plataforma continental norte do Estado de Sao Paulo: I-Padroes de densidade e diversidade especifica. Boletim do Instituto Oceanografico,, 41 (1 - 2), 69 - 80. https: // doi. org / 10.1590 / S 0373 - 55241993000100006

Palacios, J. R., Bremec, C. S., Rivero, M. S. & Elias, R. (2005) Primer registro de Parandalia tricuspis (Muller, 1858) y Sigambra cf. tentaculata (Treadwell, 1941) (Pilargidae: Polychaeta) en Argentina. Revista de Biologia Marina y Oceanografia, 40, 71 - 75. https: // doi. org / 10.4067 / S 0718 - 19572005000100009

Pettibone, M. H. (1966) Revision of the Pilargidae (Annelida: Polychaeta), including descriptions of a new species and descriptions of the pelagic Podarmus ploa Chamberlin (Polynoide). Proceedings of the United States National Museum, 118 (3525), 155 - 207. https: // doi. org / 10.5479 / si. 00963801.118 - 3525.155

Salazar-Vallejo, S. I. (1990) Redescription of Sigambra grubii Muller, 1858 and Hermundura tricuspis Muller, 1858 from Brazil and designation of neotypes (Polychaeta: Pilargidae). Journal of Natural History, 24, 507 - 517. https: // doi. org / 10.1080 / 00222939000770351

Salazar-Vallejo, S. I. & Orensanz, J. M. (1991) Pilargidos (Annelida: Polychaeta) de Uruguay y Argentina. Cahiers de Biologie Marine, 32, 267 - 279.

Webster, H. E. (1879) Annelida Chaetopoda of the Virginia coast. Transactions of the Albany Institute, 9, 202 - 272.

Figures

FIGURE 9. Hermundura tricuspis. A. SEM, anterior end, dorsal view. B. SEM, parapodium, dorsolateral view. C. SEM, posterior end, dorsolateral view. D. SEM, neuropodium, ventrolateral view.Abbreviations. Chaet 1: first chaetiger, Nec: neurochaeta, Noc: notochaetae, Pp: palp, Pt: prostomium, Py: pygidium, Pyc: pygidial cirrus. Scale bars: 100 µm (A, C), 200 µm (B, D).