Atlantocuma confunda, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 21-23

Atlantocuma confunda n. sp.

Figures 10–11

Type material. Holotype ovigerous female, NIWA 80728 ; Paratype ovigerous female, dissected, NIWA 80729 ; Paratype ovigerous female, NIWA 80730 ; 42.9958°S, 178.9957°E – 42.9910°S, 179.0052°E, 520–530 m, 24 April 2007.

Other material examined. 10 ovigerous females, 1 juvenile, NIWA 45997 , 42.9958°S, 178.9957°E – 42.9910°S, 179.0052°E, 520–530 m, 24 April 2007 . 1 ovigerous female, 1 juvenile, NIWA 84452 , 42.9958°S, 178.9957°E – 42.9910°S, 179.0052°E, 520–530 m, 24 April 2007 . 1 ovigerous female, 1 subadult male, NIWA 41811 , 42.9958°S, 178.9957°E – 42.9910°S, 179.0052°E, 520–530 m, 24 April 2007 . 6 ovigerous females, NIWA 45996 , 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007 .

Diagnosis. Females and subadult males. Carapace smooth, not elevated in ovigerous females; antennal notch not present, anterolateral corner not present. Antennule geniculate. Uropod peduncles 2.3 times pleonite 6 length, 2.2 times endopod length; endopod with 10 microserrate setae with single subterminal setule medially. Male. Adult unknown.

Description. Holotype ovigerous female, 3.7 mm, NIWA 80728. Paratype ovigerous female, 3.7 mm, NIWA 80729. Carapace smooth, not arched; pseudorostral lobes 0.4 times carapace length, meet in front of eyelobe for 0.14 times carapace length; eyelobe 0.02 times carapace length, without lenses; carapace 1.5 times length of pereonites together. Pleon 1.1 times length of carapace and pereonites together ( Figures 10A–B).

Antennule geniculate between peduncle article 1 and article 2; peduncle article 1 longest, with 2 pedunculate setae; article 2 0.8 times article 1 length, with 2 simple setae; article 3 1.1 times article 2 length, with 2 simple setae; main flagellum of 3 articles, with 2 aesthetascs and 2 simple setae; accessory flagellum of uniarticulate, with 3 simple setae ( Figure 10C).

Maxillule with 2 endites; outer endite broad, with 5 thin simple setae, 1 simple seta laterally; inner endite with 2 thin simple setae; palp with 2 microserrate setae ( Figure 10D).

Maxilliped 1 basis equal to length of all other articles together, produced as lobe medially with 2 hook setae, few hairlike setae on margin; ischium absent; merus 0.2 times basis length, with simple seta; carpus 3.2 times merus length, with 5 beak and 3 simple setae medially; propodus 0.4 times carpus length, with 3 simple setae; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 10E).

Maxilliped 2 basis 1.1 times length of all other articles together, with simple seta; ischium 0.07 times basis length, unarmed; merus 3.3 times ischium length, with simple seta; carpus 1.3 times merus length, with 3 simple setae; propodus 0.7 times carpus length, with 4 simple setae; dactylus 0.3 times propodus length, with simple seta terminally ( Figure 10F).

Maxilliped 3 basis 1.7 times length of all other articles together, with 5 stout pappose setae medially, 2 pappose setae at distal corner; ischium 0.07 times basis length, unarmed; merus 1.3 times ischium length, with 2 pappose setae; carpus 2.6 times merus length, with 3 pappose setae; propodus 0.8 times carpus length, with 4 simple setae; dactylus 0.4 times propodus length, with 3 simple setae terminally; exopod shorter than basis, flagellum with plumo-annulate setae ( Figure 10 G).

Pereopod 1 basis 1.3 times length of all other articles together, with simple seta; ischium 0.07 times basis length, with simple seta; merus 1.6 times ischium length, with simple seta; carpus 2.5 times merus length, with 3 simple setae; propodus 0.7 times carpus length, with 3 simple setae; dactylus 0.6 times propodus length, with 3 simple setae terminally; exopod shorter than basis, flagellum with plumo-annulate setae ( Figure 10H).

Pereopod 2 basis 0.8 times length of all other articles together, with 2 setae proximally; ischium 0.09 times basis length, unarmed; merus 3 times ischium length, with 3 simple setae; carpus 1.1 times merus length, with 2 simple setae; propodus 0.7 times carpus length, unarmed; dactylus 2.1 times propodus length, with 2 simple setae, and 3 stout microserrate and 1 long simple setae terminally ( Figure 11A).

Pereopod 3 basis 1.2 times length of all other articles together, with plumose seta; ischium 0.07 times basis length, with annulate seta; merus 2.3 times ischium length, with annulate seta; carpus 2 times merus length, with 2 annulate setae; propodus 0.6 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 11B).

Pereopod 4 basis 0.9 times length of all other articles together, with 1 simple and 1 plumose setae; ischium 0.1 times basis length, unarmed; merus 1.8 times ischium length, with annulate seta; carpus 2.6 times merus length, with 1 simple and 2 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 2 simple setae terminally ( Figure 11C).

Pereopod 5 basis 0.7 times length of all other articles together, with plumose seta; ischium 0.1 times basis length, with annulate seta; merus 1.8 times ischium length, with annulate seta; carpus 2.6 times merus length, with 2 simple and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 11D).

Uropod peduncles 2.3 times pleonite 6 length, with 0–1 microserrate with single subterminal seta. Uropod endopod 0.4 times peduncle length, with 10 microserrate with single subterminal setae medially, terminal seta with single subterminal setule. Uropod exopod of 2 articles, equal to length of endopod; article 1 0.1–0.2 times article 2 length, unarmed; article 2 with 0–3 complex pedunculate setae, 2 setae with single subterminal setule, terminal seta with single subterminal setule ( Figure 11E).

Etymology. The species is named confunda , in reference to the confusion possible with Cyclaspis in New Zealand waters.

Remarks. If only female specimens are available, superficial examination suggests Cyclaspis , in that exopods are only present on maxilliped 3-pereopod 1. However, the pseudorostral lobes meet in front of the eyelobe for a distance of more than 10% of the total carapace length, unlike the New Zealand Cyclaspis , in which the pseudorostral lobes barely meet in front of the eyelobe, if at all. There is no other species in the New Zealand nannastacid fauna that is likely to be confused with this one, the exopod pattern of the female is unique within the New Zealand fauna, nor are there any species of Atlantocuma currently reported from Australian waters.

The mouthparts of the ovigerous female described resemble the degenerate mouthparts described for Atlantocuma and Pseudopicrocuma by Akiyama (2012), with few small setae present on the maxillule, maxillliped 1 and maxilliped 2, and few setae present on maxilliped 3 but with relatively stout pappose setae medially on the basis.

Campylaspenis B ă cescu & Muradian 1974

Type species. Campylaspenis rowei Băcescu & Muradian 1974 .

Diagnosis after B ă cescu & Muradian 1974. Female. Similar in appearance to Campylaspis , with the same maxilliped 1 and maxilliped 2 morphology. Male. With a pair of large penial lobes, wider than the diameter of pereopod 5 and longer than the basis of pereopod 5.

New Zealand species. Campylaspenis tangaroae n. sp.

Remarks. It is not possible to distinguish females of this genus from Campylaspis except by comparison of species specific differences. Therefore, the key to New Zealand Campylaspis includes Campylaspenis .