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Two new species of Rhynchonema Cobb, 1920 from a Brazilian sandy beach
Bezerra, T.N.; Smol, N.; Vincx, M. (2014). Two new species of Rhynchonema Cobb, 1920 from a Brazilian sandy beach. Mar. Biodiv. 44(3): 343-365. hdl.handle.net/10.1007/s12526-014-0223-6
In: Marine Biodiversity. Springer: Heidelberg; Berlin. ISSN 1867-1616; e-ISSN 1867-1624, meer
Peer reviewed article  

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Trefwoorden
    Sandy beaches
    Nematoda [WoRMS]; Rhynchonema Cobb, 1920 [WoRMS]; Rhynchonema cemae Bezerra, Smol & Vincx, 2014 [WoRMS]; Rhynchonema veronicae Bezerra, Smol & Vincx, 2014 [WoRMS]
    South America [Marine Regions]
    Marien
Author keywords
    Rhynchonema sp.n; Tropical; Marine nematode; Revision

Auteurs  Top 
  • Bezerra, T.N.
  • Smol, N.
  • Vincx, M.

Abstract
    Rhynchonema Cobb, 1920 is a genus with worldwide distribution. It is found in diverse coastal environments ranging from brackish water to exposed beaches in intertidal and low subtidal zones, from clay to coarse sand and in sediments under seagrass beds. In this study we describe two new tropical species from Northeast South America: Rhynchonema cemae sp.n. and R. veronicae sp. n. from Olinda’s Isthmus, Pernambuco, Brazil. These two species are mainly characterized by the shapes of the spicules and gubernaculum, which are described here for the first time. The two species can be differentiated primarily on the basis of the spicules, which in R. cemae are symmetrical, fine and long, while in R. veronicae they are asymmetrical, more robust and shorter. We describe for the first time the presence of Rhynchonema species on the east side of South America and provide a review of the genus and a polytomous identification key. Our review of the literature and construction of a polytomous key demonstrated that most of the species descriptions are incomplete.

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