Arktourella, Gómez & Nazari, 2021

Gómez, Samuel & Nazari, Fatemeh, 2021, Proposal of Arktourella gen. nov., a new genus of the family Normanellidae Lang 1944 (Copepoda: Harpacticoida) from the Province of Cortez, Zootaxa 5057 (1), pp. 29-51 : 31-32

publication ID 10.11646/zootaxa.5057.1.2

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gen. nov.

Genus Arktourella gen. nov.

Type and only species. Arktourella margarethae gen. et sp. nov., by monotypy.

Differential diagnosis. Normanellidae . Habitus semi-cylindrical, without clear demarcation between prosome and urosome. Cephalothorax covered with minute denticles, with areolated surface pattern, posterior margin serrated, lateral margin plain. Rostrum well-developed, discrete, triangular. P1-bearing somite fully incorporated to cephalothorax; P2–P4-bearing somites covered with minute denticles, serrated posterior margins progressively coarser posteriad. P5-bearing somite, and abdominal somite covered with surface denticles and with serrate posterior margin. Genital somite and third urosomite separated dorsolaterally but completely fused ventrally forming genital double-somite in the female. Anal somite with surface ornamentation as in previous somites; anal operculum semicircular, well-developed, with serrated posterior margin. Caudal rami twice as long as wide, with seven setae. Antennule five-segmented in the female. Antenna with allobasis, with one abexopodal seta; exopod one-segmented with four setae. Mandible biramous; basis with two setae; endopod one-segmented with four setae; exopod onesegmented with one seta. Maxillulary basis with two endites; endopod incorporated to basis, with two setae; exopod one-segmented, with two setae. Maxilla with three syncoxal endites; allobasis with two accompanying setae; endopod incorporated to allobasis, with three setae. Maxilliped subchelate; syncoxa with two setae; basis unarmed; endopod one-segmented, with long claw and accompanying seta. P1–P4 EXP three-segmented; P1–P4 ENP twosegmented, of P1 prehensile. P5 BENP and EXP not fused, elongate; endopodal lobe with five, exopod with six setae. P6 represented by one bipinnate seta. Sexual dimorphism expressed in separated genital somite and third urosomite, antennule, P2 and P3 ENP, P5 and P6. Male antennule subchirocer, seven-segmented. Inner seta of P2 ENP1, and distal, subdistal outer, and outer setae of ENP2 comparatively shorter than in the female. P3 ENP with comparatively shorter inner seta of ENP1, and with comparatively shorter distal inner and outer seta of ENP2, the latter segment with outer apophysis. P5 BENP and EXP not fused; both baseoendopods fused medially; endopodal lobe with two, exopod with four setae. P6 asymmetrical, only one leg functional, each leg with three setae. Armature formula of P1–P4 as follows:

Etymology. The generic name derives from the Greek given name Αρκτοῦρος, Arktouros (from ἄρκτος, arktos, bear, and οὖρος, ouros, guardian, meaning the Guardian of the Great Bear or Ursa Major constellation; Arktouros derived into the Latin given name Arcturus), and the Latin diminutive suffix -ella. The species is dedicated to the senior author’s godfather Arturo Villanueva Robertson for his 74 th birthday and for his 49 th wedding anniversary with the senior author’s godmother Margarita Noguera Farfán. It is to be treated as a noun in the nominative singular, gender feminine.

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