Pinkertonius, Bradford-Grieve & Boxshall & Blanco-Bercial, 2014

Bradford-Grieve, Janet M., Boxshall, Geoffrey A. & Blanco-Bercial, Leocadio, 2014, Revision of basal calanoid copepod families, with a description of a new species and genus of Pseudocyclopidae, Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 171 (3), pp. 507-533 : 527-528

GENUS PINKERTONIUS GEN. NOV.

Diagnosis: As for Pseudocyclopidae , except female caudal ramus longer on right. Mandible endopod longer than exopod. Leg 1 basis without outer edge seta, mediodistal seta present and posterior surface process present; exopod segment 2 without spinous lobe; endopod segment 3 with three inner setae. Leg 3 outer distal corner of basis with one spine-like seta; exopod segment 1 with one inner seta; segment 3 with three outer spines. Leg 4 exopod segment 1 with one inner seta; segment 3 with four inner setae. Female leg 5 endopod formula: 0–1; 0–1; 2, 2, 2. Exopod segment 2 extended distolaterally. Male leg 5 formula similar to

that of female, except for exopods: I-0; I-1; I, 0, I (left) and I-0; I-0; I, 0, I (right); left and right exopod segment 2 with inner processes.

Type species: Pinkertonius ambiguus gen. et sp. nov. by original designation.

Remarks: The most distinctive shared characteristics that link this genus to the family Pseudocyclopidae are: the absence of an aesthetasc on ancestral antennular segment IV; the presence of a well-developed, elongate two-segmented mandibular endopod with ten terminal setae; the presence of nine setae on the coxal epipodite of the maxillule; the presence of a posterior surface process on the basis of leg 1; exopod segment 2 of female leg 5 is distally extended, and the articulation between segments 2 and 3 is at an oblique angle to the main axis of the limb; and the right exopod segment 2 of male leg 5 has a triangular inner process and left exopod segment 2 has a scalpel-like inner projection that is directed distally.