Campylaspis bituberculata, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 37-41

Campylaspis bituberculata n. sp.

Figures 20–21

Type material. Holotype ovigerous female, dissected, NIWA 80651 , 43.8363°S, 176.7092°E – 43.8330°S, 176.7127°E, 478–479 m, 5 April 2007 . Paratype subadult male, dissected, NIWA 80652 , 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007 .

Other material examined. 1 subadult female, NIWA 79295 , 44.1208°S, 174.8432°E – 44.1242°S, 174.8448°E, 512–513 m, 4 April 2007 . 1 subadult male, NIWA 79294 , 43.8363°S, 176.7092°E – 43.8330°S, 176.7127°E, 478–479 m, 5 April 2007 . 1 manca, NIWA 79296 , 42.6213°S, 175.9225°E – 42.6203°S, 175.9335°E, 1194–1199 m, 26 April 2007 . 1 subadult female, 1 manca, NIWA 79297 , 43.7967°S, 175.3158°E – 43.8045°S, 175.3148°E, 418–422 m, 27 April 2007 . 2 mancae, NIWA 79298 , 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007 .

Diagnosis. Females and subadult males. Carapace textured, with sulcus not bounded by carinae, large tubercles at posterior corners of frontal lobe, no other tubercles present on carapace; pseudorostrum not dorsally directed. Carapace, pereonites and pleonites with scattered red chromatophores. Pereonites 1–2 not free dorsally. Pereopod 2 dactylus normal, terminal seta long. Uropod peduncles 1.8 times length of pleonite 6. Male. Adult unknown.

Description of female.

Holotype ovigerous female, 4.0 mm, NIWA 80651. Carapace textured, with sulcus not bounded by carinae, large tubercles at posterior corners of frontal lobe, no other tubercles present on carapace; pseudorostral lobes 0.3 times carapace length; eyelobe 0.05 times carapace length, without lenses; carapace overhanging pereonites 1–3, pereonite 1 not visible, pereonite 2 only visible laterally. Carapace, pereonites, pereopods and pleonites with scattered red chromatophores ( Figures 20A–B).

Antennule peduncle article 1 equal to article 2 length, with 4 simple and 2 pedunculate setae; article 2 equal to article 1 length, with 2 simple setae; article 3 0.8 times article 2 length, with pedunculate seta; main flagellum of 3 articles, with 2 aesthetascs and pedunculate seta; accessory flagellum of 1 article, with 3 pedunculate setae ( Figure 20D).

Maxilliped 2 basis equal to length of all other articles together, unarmed; ischium absent; merus 0.3 times basis length, with 2 plumose setae; carpus 0.5 times merus length, with 4 plumose setae; propodus 1.6 times carpus length, with large seta distally; dactylus 1.3 times propodus length, produced as 3 teeth terminally, central tooth short, outer pair equal in length ( Figure 20H).

Maxilliped 3 basis 1.2 times length of all other articles together, with plumose seta medially, 1 plumose and 1 simple setae at distal corner, medial margin serrate; ischium 0.07 times basis length, unarmed; merus 3.6 times ischium length, with 6 simple setae medially, plumose seta laterally, lateral margin distal corner produced as tooth, medial margin distal corner produced as tooth; carpus 0.7 times merus length, with 4 simple and 1 plumose setae medially, plumose seta laterally, medial margin lined with fine hair-like setae; propodus equal to carpus length, with 2 plumose setae medially and plumose seta laterally, medial margin lined with fine hair-like setae; dactylus 0.5 times propodus length, with 3 microserrate setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 20I).

Pereopod 1 basis 1.1 times length of all other articles together, with 2 simple and 1 plumose setae, distal corner produced as strong tooth; ischium 0.04 times basis length, unarmed; merus 7.3 times ischium length, with 6 simple and 1 plumose setae; carpus 0.8 times merus length, with 4 simple setae; propodus 0.8 times carpus length, with 4 simple setae; dactylus 0.7 times propodus length, with simple seta and 6 simple setae terminally; exopod equal to basis length, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 21A).

Pereopod 2 basis 0.5 times length of all other articles together, with simple seta; ischium 0.07 times basis length, unarmed; merus 5.3 times ischium length, with 2 simple and 1 plumose setae; carpus 1.9 times merus length, with 6 simple setae; propodus 0.3 times carpus length, with complex pedunculate seta; dactylus 4.1 times propodus length, with 6 simple and 3 plumose setae and 2 plumose setae terminally; exopod 1.5 times basis length, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 21B).

Pereopod 3 basis 1.4 times length of all other articles together, with 2 simple setae; ischium 0.1 times basis length, with plumose seta; merus equal to ischium length, with plumose seta; carpus 2.4 times merus length, with 1 simple, 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with 1 annulate and 1 complex pedunculate setae; dactylus 0.6 times propodus length, with 2 simple setae terminally ( Figure 21C).

Pereopod 4 basis 1.2 times length of all other articles together, with 4 simple setae; ischium 0.08 times basis length, with simple seta; merus 2.3 times ischium length, with 2 simple setae; carpus 2.0 times merus length, with 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with 1 annulate and 1 pedunculate setae; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 21D).

Pereopod 5 basis 0.6 times length of all other articles together, with 2 simple setae; ischium 0.3 times basis length, with simple seta; merus 1.3 times ischium length, with simple seta; carpus 1.9 times merus length, with 1 plumose 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 21E).

Uropod peduncles 1.8 times pleonite 6 length, with 8–9 simple setae, margins serrate. Uropod endopod uniarticulate, 0.5 times peduncle length, with 4 microserrate setae with single subterminal setules medially, 1 simple, 1–2 pedunculate and 1 microserrate with single subterminal setule setae laterally, terminal seta microserrate with single subterminal setule. Uropod exopod of 2 articles, equal to length of endopod; article 1 0.2 times article 2 length, with simple seta; article 2 with 1 simple and 1 microserrate with single subterminal setule setae laterally, terminal seta microserrate with single subterminal setule ( Figure 21F).

Description of juvenile male.

Paratype juvenile male, 2.0 mm, NIWA 80652. Carapace textured, with sulcus not bounded by carinae, large tubercles at posterior corners of frontal lobe, no other tubercles present on carapace; pseudorostral lobes 0.3 times carapace length; eyelobe 0.08 times carapace length, without lenses; carapace overhanging pereonites 1–3. Carapace, pereonites, pereopods and pleonites with scattered red chromatophores ( Figure 20C).

Mandible truncate, with 4–5 microserrate setae medially, lacinia mobilis with 4 cusps ( Figure 20E).

Maxillule with 2 endites; outer endite with 5 simple and 3 dentate setae terminally, simple seta on margin; inner endite with 3 simple, 2 microserrate and 1 dentate setae; palp with 2 microserrate setae ( Figure 20F).

Maxilla reduced to single endite with 5 simple setae terminally ( Figure 20G).

Etymology. The species is named bituberculata in reference to the pair of large tubercles found at the corners of the frontal lobe, where the pseudorostral lobes begin.

Remarks. This species is most similar to Campylaspis zealandiaensis , which also possesses one pair of large tubercles dorsally. However, in C. zealandiaensis the large tubercles are not at the corners of the frontal lobe, they are lateral to the frontal lobe/ pseudorostral suture. Also, in C. zealandiaensis the carapace is much more sculptured than in C. bituberculata , with a distinct deep sulcus and a pair of posterior carinae. In comparison, C. bituberculata has a weak sulcus, and no no posterior carinae.

The holotype was the only mature specimen of this species observed, all other specimens were much smaller juveniles.