Schizocuma delicata, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 110-116

Schizocuma delicata n. sp.

Figures 64–67

Type material. Holotype ovigerous female, NIWA 80717 , 42.6213°S, 175.9225°E – 42.6203°S, 175.9335°E, 1194–1199 m, 26 April 2007 . Paratype ovigerous female, dissected, NIWA 80718 , paratype adult male, dissected, NIWA 80719 , 44.5607°S, 178.4762°W – 44.5592°S, 178.4830°W, 1076–1103 m, 10 April 2007 .

Other material examined. 1 subadult male, NIWA 79378 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 4 subadult females, NIWA 46195 , 44.5607°S, 178.4762°W – 44.5592°S, 178.4830°W, 1076–1103 m, 10 April 2007 . 1 subadult female, 1 subadult male, NIWA 79379 , 43.0650°S, 174.9325°W – 43.0732°S, 174.9348°W, 933–940 m, 13 April 2007 . 1 subadult male, NIWA 46196 , 0705 /160. 1 subadult female, NIWA 79380 , 40.1277°S, 170.2140°E – 40.1352°S, 170.2090°E, 803–805 m, 5 June 2007 . 1 subadult female, NIWA 79381 , 40.1277°S, 170.2140°E – 40.1352°S, 170.2090°E, 803–805 m, 5 June 2007 .

Diagnosis. Females and subadult males. Carapace with 3–4 large spines and 2 setae on mid-dorsal line; pseudorostral lobes directed upward; eyelobe absent. Carapace and pereonites together 0.4 times total body length. Antennule extending past siphons. Male. Carapace without spines or setae. Antennal flagellum extending to end of pereon. Uropods slightly more setose than in female.

Description of female.

Holotype ovigerous female, 3.7 mm, NIWA 80717. Paratype ovigerous female, 4.0 mm, NIWA 80718. Carapace with 3–4 large spines on middorsal line, with 2 long setae on frontal lobe; pseudorostral lobes and siphons divided, directed upwards; eyelobe absent; carapace and pereonites together 0.4 times total body length ( Figures 64A–B).

Antennule peduncle article 1 longest, with 2 simple setae; article 2 0.5 times article 1 length, with 2 simple setae; article 3 0.7 times article 2 length, unarmed; main flagellum of 2 articles, with 3 aethetascs and 3 simple setae; accessory flagellum of 1 article, with 4 simple setae ( Figure 64C).

Mandible navicular, with 5–6 microserrate setae medially, lacinia mobilis with 2 cusps ( Figure 64D).

Maxillule with 2 endites; outer endite with double row of stout setae, margin with simple seta; inner endite with 3 simple and 1 bicuspid setae; palp with microserrate with single subterminal setule seta ( Figure 64E).

Maxilla with 3 endites; broad endite with 13 simple and 1 pappose on terminal margin, medial distal corner with 1 dentate and 1 pappose setae, medial margin lined with pedunculate setae; medial narrow endite with 4 simple setae terminally; distal narrow endite with 4 simple setae terminally; both narrow endites extend only to margin of broad endite ( Figure 64F).

Maxilliped 1 basis produced as lobe, with 4 simple, 4 pappose and 1 bicuspid setae; ischium and merus absent; carpus 0.5 times basis length, with 1 simple, 4 pappose and 6 comb-like setae; propodus 0.7 times carpus length, with 2 simple, 2 pappose and 1 tricuspid setae; dactylus 0.7 times propodus length, with 4 simple setae ( Figure 64G).

Maxilliped 2 basis 0.8 times length of all other articles together, with 0–1 simple setae; ischium 0.07 times basis length, unarmed; merus 5.0 times ischium length, with pappose seta; carpus equal to merus length, with 2 plumose setae; propodus 1.1 times carpus length, with 1 simple, 4 plumose and 1 pappose setae; dactylus 0.5 times propodus length, with 4 simple setae ( Figure 64H).

Maxilliped 3 basis equal to length of all other articles together, with 2 plumose setae medially, distal corner with 3 plumose setae; ischium 0.05 times basis length, unarmed; merus 4.0 times ischium length, with plumose seta; carpus 1.5 times merus length, with 2 plumose setae; propodus equal to carpus length, with 4 simple setae; dactylus 0.8 times propodus length, with 4 simple setae terminally; exopod times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 65A).

Pereopod 1 basis 0.7 times length of all other articles together, with 6 simple setae; ischium 0.1 times basis length, unarmed; merus 1.1 times ischium length, with 2 simple setae; carpus 2.7 times merus length, with 3 simple setae; propodus 1.2 times carpus length, with 5 simple setae; dactylus 0.4 times propodus length, with simple seta and 4 simple setae terminally; exopod 0.7 times basis length, basal article with simple seta, flagellum with plumoannulate setae ( Figure 65B).

Pereopod 3 basis 1.1 times length of all other articles together, with 8 simple setae; ischium 0.07 times basis length, unarmed; merus 2.4 times ischium length, unarmed; carpus 2.5 times merus length, with 3 simple setae; propodus 0.4 times carpus length, with simple seta; dactylus 0.5 times propodus length, with 2 simple setae terminally ( Figure 65C).

Pereopod 4 basis equal to length of all other articles together, with 6 simple setae; ischium 0.06 times basis length, with simple seta; merus 4.5 times ischium length, with simple seta; carpus 1.7 times merus length, unarmed; propodus 0.4 times carpus length, with simple seta; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 65D).

Pereopod 5 basis 1.1 times length of all other articles together, unarmed; ischium 0.06 times basis length, unarmed; merus 2.7 times ischium length, with simple seta; carpus 2.6 times merus length, with 3 simple setae; propodus 0.4 times carpus length, with simple seta; dactylus 0.4 times propodus length, with simple seta terminally ( Figure 65E).

Uropod peduncles 2.9 times pleonite 6 length. unarmed. Uropod endopod uniarticulate, 0.7 times peduncle length, with 6 simple and 2 pedunculate setae, terminal seta broken. Uropod exopod of 2 articles, 0.9 length of endopod; article 1 0.2 times article 2 length, unarmed; article 2 with 3 simple setae, terminal seta broken ( Figure 65F).

Description of male.

Paratype adult male, 4.0 mm, NIWA 80719. Carapace without spines or setae; pseudorostral lobes and siphons divided, directed upwards; eye lobe absent. Carapace and pereon together 0.4 times total body length ( Figure 66A).

Antennule peduncle article 1 longest, with simple seta; article 2 0.5 times article 1 length, with 3 simple setae; article 3 0.7 times article 2 length, with 2 simple setae; main flagellum of 2 articles, with 2 aesthetascs and 3 simple setae; accessory flagellum apparently absent ( Figure 66B).

Antenna extending to posterior border of pereon; peduncle of 5 articles, article 2 with plumose seta, articles 4–5 with ranks of setae, incompletely circling articles; flagellum with 21 articles, each with single seta ( Figures 66C–D).

Maxilliped 3 basis 1.3 times length of all other articles together, with 2 pappose setae medially, distal corner with 3 plumose setae; ischium 0.04 times basis length, unarmed; merus 3.5 times ischium length, with 1 plumose and 1 pappose setae; carpus 1.3 times merus length, with 1 simple and 2 plumose setae; propodus 1.4 times carpus length, with 1 simple and 3 plumose setae; dactylus 0.5 times propodus length, with 2 simple setae terminally; exopod 1.1 times basis length, basal article with simple seta, flagellum with plumo-annulate setae ( Figure 66E).

Pereopod 1 basis 0.6 times length of all other articles together, with 1 simple and 2 microserrate setae, lateral margin serrate; ischium 0.2 times basis length, with simple seta; merus 1.4 times ischium length, with simple seta; carpus 2.1 times merus length, with 2 simple setae; propodus 1.2 times carpus length, with 3 simple setae; dactylus 0.4 times propodus length, with 3 simple setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 66F).

Pereopod 2 basis 0.8 times length of all other articles together, with 2 simple setae; ischium 0.02 times basis length, unarmed; merus 6 times ischium length, with 3 simple setae; carpus 2.8 times merus length, with 3 simple and 2 microserrate setae; propodus 0.4 times carpus length, unarmed; dactylus 3.1 times propodus length, with 3 simple and 2 microserrate setae, terminal seta simple; exopod 1.2 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 67A).

Pereopod 3 basis 1.4 times length of all other articles together, with 1 simple and 2 pappose setae; ischium 0.07 times basis length, unarmed; merus 2.0 times ischium length, with simple seta; carpus 2.8 times merus length, unarmed; propodus 0.3 times carpus length, with simple seta; dactylus 0.4 times propodus length, with simple seta terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 67B).

Pereopod 4 basis 1.1 times length of all other articles together, with 2 pappose setae; ischium 0.08 times basis length, with simple seta; merus 2.3 times ischium length, unarmed; carpus 2.3 times merus length, with simple seta; propodus 0.3 times carpus length, with simple seta; dactylus 0.4 times propodus length, with 3 simple setae terminally; exopod 0.9 times basis length, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 67C).

Pereopod 5 basis equal to length of all other articles together, with 2 simple setae; ischium 0.09 times basis length, unarmed; merus 2.0 times ischium length, with simple seta; carpus 2.5 times merus length, with 3 simple setae; propodus 0.5 times carpus length, with 2 simple setae; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 67D).

Uropod peduncles 3.7 times pleonite 6 length, with 3 microserrate setae medially. Uropod endopod uniarticulate, 0.6 times peduncle length, 7 simple setae medially, 3 simple setae laterally, terminal seta simple with single subterminal setule. Uropod exopod 0.8 times length of endopod; article 1 0.3 times article 2 length, unarmed; article 2 with 1–2 simple setae, 1 simple with single subterminal setule, terminal seta simple with single subterminal setule ( Figure 67E).

Etymology. The species is named delicata in reference to the long, slender and delicate pleon and appendages.

Remarks. There are no other nannastacids known from New Zealand waters with a split siphon. Therefore, this species is unlikely to be confused with any other species from New Zealand waters.

Styloptocuma B ă cescu & Muradian 1974

Type species. Styloptocuma antipai Băcescu & Muradian 1974 .

Diagnosis after Petrescu 2006. Female. Eye lobe long, reaching to end of pseudorostral lobes, without lenses. Uropod peduncles at least twice as long as pleonite 6 length. Exopods present on maxilliped 3-pereopod 2. Male. With exopods on maxilliped 3-pereopod 4. Antennal flagellum long.

New Zealand species. Styloptocuma gordoni n. sp.

Remarks. Styloptocuma is distinguished among the Cumella-like genera by the long narrow eye lobe without lenses.