Carraroenia, Edward, 2006

Edward, 2006, Carraroenia ruthae gen. et sp. nov. (Copepoda, Harpacticoida, Laophontidae) from maerl substrates of the Irish west coast, Zootaxa 1202, pp. 39-52 : 40

Genus Carraroenia gen. nov.

Diagnosis

Laophontidae . Body elongate, cylindrical, not dorsoventrally depressed. Posterolateral corners of cephalothorax produced into lobate extensions. Posterior margin of cephalothorax and pedigerous somites with rows of long sensillae interspersed with small setules. Genital double­somite with transverse surface ridge with row of setules and pairs of sensillae dorsally and laterally indicating original segmentation. Genital field with copulatory pore located medially with cone­shaped extension. Anal operculum well developed. Rostrum bell­shaped, defined at base. Antennule without spinous processes on segment 2; 6­segmented in Ψ, 8­segmented and subchirocer in ɗ; aesthetascs on segments 4 and 7 in Ψ, and 5 and 8 in ɗ; apical trithek consisting of small aesthetasc and 2 setae. Antennary exopod well developed with 4 setae. Mandibular palp small with exopod and endopod fused to basis, represented by 1 and 3 naked setae respectively; basal armature represented by naked seta. Maxillule with seta and spine on coxa; basis with 2 setae and 1 spine; endopod incorporated into basis, represented by 3 setae; exopod with 2 setae. Maxillary syncoxa with 2 cylindrical endites each with 3 setae; praecoxal endite absent; allobasis drawn out into strong, slightly curved distally pinnate claw; accessory armature consisting of 2 naked setae; endopod small with 3 naked setae. Maxilliped with 2 setae on syncoxa; endopodal claw long, bearing seta at base. Swimming legs P1–P4 with 3­ segmented exopods and 2­segmented endopods (except ɗ P3 endopod is 3­segmented); chaetotaxy of swimming legs described below. P5 with separate exopod and baseoendopod; exopod elongate with 6 setae in Ψ (2 proximal setae superimposed), 5 in ɗ; endopodal lobe well developed, subrectangular with 4 setae in Ψ, rudimentary with 2 setae and 1 tube pore in ɗ. P6 forming well developed opercula with small seta in Ψ; asymmetrical in ɗ represented on both sides by small plate (fused to ventral wall of supporting somite along one side; articulating at base and covering gonopore along other side), outer distal corner produced into cylindrical process bearing 2 setae. Caudal rami cylindrical, more than 5 times longer than wide. Sexual dimorphism in antennule, P3, P4, P5, P6 and genital segmentation.