Journal of the Marine Biological Association of the United Kingdom

Research Article

Archeolourinia shermani, a new genus and species of Louriniidae (Copepoda: Harpacticoida) from a Caribbean mesophotic zone

P.H.C. Corgosinhoa1a2 c1 and N.V. Schizasa3

a1 Foundation Unesco/HidroEx, Avenida Professor Mário Palmério 1000, 38200-000, Frutal-MG, Brazil

a2 Department of Human Sciences, State University of Minas Gerais-UEMG/Campus Frutal, Avenida Professor Mário Palmério 1000, 38200-000, Frutal-MG, Brazil

a3 Department of Marine Sciences, University of Puerto Rico, Mayagüez, Call Box 9000, Mayagüez, PR 00681, USA

Abstract

Mesophotic coral ecosystems (MCEs) are found on the insular and continental slopes of Caribbean islands and comprise mainly scleractinian corals, sponges and macroalgae. These species provide habitat for a highly diverse and specialized crustacean fauna. A new genus and species of the family Louriniidae is described from samples taken from an MCE in south-west Puerto Rico. The new taxa can be diagnosed by: body elongate, almost cylindrical and with inconspicuous podoplean boundary between prosome and urosome; double genital somite with a discontinuous chitinized cuticular ridge; telson short with rectangular anal operculum; furca short; rostrum sinusoidal, well defined at the base; antennules 7-segmented with aesthetasc on the fourth segment; antenna with a brush-like basal seta and an abexopodal seta, exopod 1-segmented with 2 setae; endopod with 7 elements (1 geniculate seta and 1 modified inner spine); maxilliped well developed, prehensile, composed of syncoxa, basis, one segmented endopod and one claw-like apical seta; leg 1 endopod 3-segmented, first segment with a modified inner seta; legs 2, 3 and 4 with 2-segmented endopod with inner seta on the first segment; leg 5 basendopod fused, well developed with 4 setae, exopod well developed, with 5 setae; leg 6 represented by a single seta; and genital slits wide apart. The new genus and species can be confidently assigned to the family Louriniidae on the basis of the following synapomorphies: rostrum well-developed with rounded tip; antennule of female 7-segmented; mandible palp reduced; maxillule endopod and exopod absent; maxillae endopodite 2 represented by 3 setae; leg 5 basoendopod of female confluent, intercoxal sclerite absent, exopod 1-segmented; eggs retained in a single ventral egg sac; telson shorter than last urosomite; and furca short and with 6 setae.

(Received July 10 2012)

(Accepted August 01 2012)

(Online publication September 21 2012)

Keywords

  • mesophotic coral ecosystems;
  • Puerto Rico;
  • Louriniidae;
  • Harpacticoida;
  • new genus;
  • new species

Correspondence

c1 Correspondence should be addressed to: P.H.C. Corgosinho, Foundation Unesco/HidroEx, Avenida Professor Mário Palmério 1000, 38200-000, Frutal-MG, Brazil email: paulo.corgosinho@hidroex.mg.gov.br