Vensala incerta (Copepoda, Calanoida): a new genus and species from deep Atlantic waters

E.L. Markhaseva

Proceedings of the Zoological Institute RAS, 2015, 319(2): 182–195 · https://doi.org/10.31610/trudyzin/2015.319.2.182

Full text

Abstract

A new genus of a benthopelagic copepod is described from females and male taken from the abyss of the South Atlantic close to the sea bed. Vensiasa incerta gen. et sp. n. shares the presence of sensory setae on maxilla and maxilliped with all other “Bradfordian” members of the Clausocalanoidea. This new genus with a 1, 2, 3 setal pattern on the praecoxal endites of the maxilliped is attributed to the Diaixidae. Vensiasa gen. n. is distinct from all other diaixid genera in the following characters: maxillulary endopod with 5 setae; maxillary endopod setal formula as 6w+2br, worm-like setae differ in morphology between each other, same for brush-like setae; male’s P5 protopods asymmetrical, and left leg endopod is longer than the 3-segmented exopod. A differential diagnosis for the genus is given based on both sexes. Vensiasa gen. n. is now found from equator up to 36°S in the eastern and western South Atlantic.

Key words

Copepoda, new taxa, Vensiasa gen. n., calanoids, Atlantic, deep water, benthopelagic

Submitted March 5, 2015 · Accepted March 11, 2015 · Published June 25, 2015

References

Andronov V.N. 1974. Phylogenetic relations of large taxa within the suborder Calanoida (Crustacea, Copepoda). Zoologicheskii Zhurnal, 53: 1002–1012. [In Russian].

Andronov V.N. 2014. Phylogeny and revision of calanoid copepods system. Smartbooks, Kaliningrad, 206 pp. [In Russian with English summary].

Blanco-Bercial L., Bradford-Grieve J. and Bucklin A. 2011. Molecular phylogeny of the Calanoida (Crustacea: Copepoda). Molecular Phylogenetics and Evolution, 59: 103–113. https://doi.org/10.1016/j.ympev.2011.01.008

Brenke N. 2005. An epibenthic sledge for operations on marine soft bottom and bedrock. Marine Technology Society Journal, 39: 10–19. https://doi.org/10.4031/002533205787444015

Ferrari F.D. and Ivanenko V.N. 2001. Interpreting segment homologies of the maxilliped of cyclopoid copepods by comparing stage-specific changes during development. Organisms, Diversity and Evolution, 1: 113–131. https://doi.org/10.1078/1439-6092-00009

Ferrari F.D. and Ivanenko V.N. 2008. The identity of protopodal segments and the ramus of maxilla 2 of copepods (Copepoda). Crustaceana, 81: 823–835. https://doi.org/10.1163/156854008784771702

Ferrari F.D. and Markhaseva E.L. 2000a. Brachycalanus flemingeri and B. brodskyi, two new copepods (Crustacea: Calanoida: Phaennidae) from benthopelagic waters of the tropical Pacific. Proceedings of the Biological Society of Washington, 113: 1064–1078.

Ferrari F.D. and Markhaseva E.L. 2000b. Grievella shanki, a new genus and species of scolecitrichid calanoid copepod (Crustacea) from a hydrothermal vent along the southern East Pacific Rise. Proceedings of the Biological Society of Washington, 113: 1079–1088.

Ferrari F.D. and Steinberg D. 1993. Scopalatum vorax (Esterly, 1911) and Scolecithricella lobophora Park, 1970 calanoid copepods (Scolecitrichidae) associated with a pelagic tunicate in Monterey Bay. Proceedings of the Biological Society of Washington, 106: 467–489.

Huys R. and Boxshall G.A. 1991. Copepod Evolution. The Ray Society, London, 468 p.

Markhaseva E.L. 2014. New Sensiava species (Copepoda: Calanoida: Diaixidae) from the deep South Atlantic and first description of the female. Zootaxa, 3802: 217–239. https://doi.org/10.11646/zootaxa.3802.2.5

Markhaseva E.L. and Ferrari F.D. 2005. New benthopelagic bradfordian calanoids Crustacea: Copepoda) from the Pacific Ocean with comments on generic relationship. Invertebrate Zoology, 2: 111–168. https://doi.org/10.15298/invertzool.02.2.01

Markhaseva E.L., Laakmann S. and Renz J. 2014. An interim synopsis of the Bradfordian families with a description of Thoxancalanus spinatus (Copepoda: Calanoida), a new diaixid genus and species from the deep Atlantic Ocean. Marine Biodiversity, 44: 63–88. https://doi.org/10.1007/s12526-013-0185-0

Park T. 1986. Phylogeny of calanoid copepods. Syllogeus, 58: 191–196.