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Description of Ancorabolus hendrickxi sp. nov. (Copepoda: Harpacticoida: Ancorabolidae) from the neotropics and notes on caudal ramus development within oligoarthran harpacticoids
Gómez, S.; Conroy-Dalton, S. (2002). Description of Ancorabolus hendrickxi sp. nov. (Copepoda: Harpacticoida: Ancorabolidae) from the neotropics and notes on caudal ramus development within oligoarthran harpacticoids. Cah. Biol. Mar. 43(2): 111-129
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Peer reviewed article  

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Keywords
    New species; Phylogeny; Taxonomy; Ancorabolus hendrickxi Gómez & Conroy-Dalton, 2002 [WoRMS]; ISE, Mexico [Marine Regions]; Marine

Authors  Top 
  • Gómez, S.
  • Conroy-Dalton, S.

Abstract
    A single female specimen of Ancorabolus hendrickxi sp. nov. (Harpacticoida: Ancorabolidae) was found in meiofauna samples taken off Sinaloa (North-western Mexico) at a depth of 1985 m. Parsimony analysis of the Ancorabolus-lineage including this new species, confirmed Conroy-Dalton & Huys' (2000) conclusions on the monophyly of Ancorabolus and the validity of both Breviconia and Juxtaramia, and identified the Scandinavian Ancorabolus confusus as the closest relative of A. hendrickxi sp. nov. Both species show close similarity in the general body shape, length and pattern of integumental processes on the cephalothorax and body somites, elongate and slender caudal rami, absence of proximal recurved process on posterior margin of second antennulary segment and presence of an inner seta on the second endopodal segment of the second swimming leg. Ancorabolus hendrickxi sp. nov. can be readily differentiated from its congeners by the complete lack of a maxillulary coxal endite, the mandibular palp with five setae, and the very reduced proximal endite of the maxillary syncoxa bearing only one seta. Re-evaluation of the taxonomic status of the recently described species A. ilvae from the Magellan Straits, Chile demonstrates that it can only be regarded as species inquirenda in Ancorabolus. An updated generic diagnosis of Ancorabolus is provided. Postembryonic caudal ramus development within oligoarthran harpacticoids is analysed, based on observations of A. confusus, Macrosetella gracilis and Microarthridion sp., and additional literature data. A generalized developmental pattern of caudal rami, based on vertical tracking of the homologyof caudal setae I-VII throughout ontogeny is proposed.

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