Procampylaspis rhypakoceros, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 96-102

Procampylaspis rhypakoceros n. sp.

Figures 55–58

Type material. Holotype subadult female, NIWA 80710 , paratype subadult female, dissected, NIWA 80711 , paratype adult male, dissected, NIWA 80712 , paratype adult male, NIWA 80713 , paratype subadult female, NIWA 80714 , 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007.

Other material examined. 1 ovigerous female, 1 subadult female, 1 adult male, 1 juvenile, NIWA 79368 , 43.8363°S, 176.7092°E – 43.8330°S, 176.7127°E, 478–479 m, 5 April 2007 . 1 subadult female, 2 juveniles, NIWA 76369 , 43.5212°S, 178.6203°W – 43.5228°S, 178.6315°W, 424–425 m, 18 April 2007 . 1 juvenile, NIWA 79370 , 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007 . 9 adult males, 81 mancae, NIWA 45134 , 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007 . 2 ovigerous females, 6 juveniles, NIWA 79371 , 43.7967°S, 175.3158°E – 43.8045°S, 175.3148°E, 418–422 m, 27 April 2007 . 4 juveniles, NIWA 79372 , 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007 . 1 ovigerous female, 2 subadult females, NIWA 79373 , 39.6373°S, 172.1532°E – 39.6457°S, 172.1522°E, 264–266 m, 7 June 2007 .

Diagnosis. Females and subadult males. Carapace with single large dorsal spine; eyelobe long. Uropod peduncle no more than twice as long as pleonite 6. Specimens coated in mucus and fine sediment. Male. Carapace less vaulted and dorsal spine shifted posteriorly relative to female; eyelobe with spine terminally. Uropod peduncle 3.4 times length of pleonite 6; uropods more setose than in female.

Description of female.

Holotype subadult female, 3.8 mm, NIWA 80710. Paratype subadult female, 4.3 mm, NIWA 80711. Carapace with single large mid-dorsal spine, otherwise unornamented; pseudorostral lobes 0.3 times carapace length; eyelobe 0.1 times carapace length, slender, without lenses. Pereonite 5 and pleonites with weak spines, few setae. Carapace, pereonites and pleonites coated in mucus and fine sediment ( Figures 55A–B).

Antennule peduncle article 1 longest, produced as single large tooth, with plumose seta; article 2 0.5 times article 1 length, with simple seta; article 3 0.8 times article 2 length, with 2 simple setae; main flagellum of 3 articles, with 2 aesthetascs and 2 simple setae; accessory flagellum of 1 article, with 1 simple and 3 pedunculate setae ( Figure 55C).

Mandible navicular, with 5 microserrate setae medially, lacinia mobilis with 2 cusps ( Figure 55D).

Maxillule with 2 endites; outer endite with 3 stout and 7 slender simple setae; inner endite with 3 simple and 1 tricuspid setae; palp with 2 microserrate setae ( Figure 55E).

Maxilla with 3 endites; broad endite with 2 pappose and 4 simple setae distally, medial margin with 2 pappose setae, medial face lined with fine hair-like setae; medial narrow endite with 3 simple setae terminally; distal narrow endite with 3 simple setae terminally; both narrow endites extending past border of broad endite ( Figure 55F).

Maxilliped 1 basis produced as lobe, with 4 plumose, 2 simple and 2 hook setae; ischium absent; merus 0.3 times basis length, unarmed; carpus 3.1 times merus length, with 10 simple and 3 plumose setae; propodus 0.4 times carpus length, with 4 simple setae; dactylus 0.4 times propodus length, with 2 simple setae terminally ( Figure 55G).

Maxilliped 2 basis broken, with plumose seta; ischium unarmed; merus 4.3 times ischium length, with 2 plumose setae; carpus 1.2 times merus length, with simple seta; propodus 1.5 times carpus length, with 3 simple setae; dactylus 0.9 times propodus length, produced as 6 medially directed teeth ( Figure 55H).

Maxilliped 3 coated in mucus ( Figure 56A).

Pereopod 1 basis 0.6 times length of all other articles together, with plumose seta; ischium 0.3 times basis length, unarmed; merus equal to ischium length, with plumose seta; carpus equal to merus length, unarmed; propodus 1.3 times carpus length, with 3 simple setae; dactylus 0.4 times propodus length, with 2 simple setae terminally; exopod equal to basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 56B).

Pereopod 2 basis equal to length of all other articles together, with 4 plumose setae; ischium 0.05 times basis length, unarmed; merus 5.0 times ischium length, with 2 plumose setae, margin produced as tooth; carpus 1.3 times merus length, with 2 simple with single subterminal setule setae; propodus 0.4 times carpus length, unarmed; dactylus 4.4 times propodus length, with 4 simple and 3 plumose setae, plumose seta terminally; exopod 1.4 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 56C).

Pereopod 3 basis 1.4 times length of all other articles together, with 3 plumose and 2 complex pedunculate setae; ischium 0.1 times basis length, with plumose seta; merus equal to ischium length, with 1 simple and 1 plumose setae; carpus 2.5 times merus length, with 2 simple, 1 plumose and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with 3 simple setae terminally ( Figure 56D).

Pereopod 4 basis 0.9 times length of all other articles together, with 2 plumose setae; ischium 0.1 times basis length, with plumose seta; merus 2.3 times ischium length, with plumose seta; carpus 1.6 times merus length, with 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.7 times propodus length, with 3 simple setae terminally ( Figure 56E).

Pereopod 5 basis 0.6 times length of all other articles together, with plumose seta; ischium 0.2 times basis length, with plumose seta; merus 2.3 times ischium length, with 1 simple and 1 plumose setae; carpus 2.1 times merus length, with 1 plumose and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 56F).

Uropod peduncles 2.0 times pleonite 6 length, with 3 simple setae laterally. Uropod endopod uniarticulate, 0.5 times peduncle length, with 3 microserrate with single subterminal setule setae medially, 1 complex pedunculate and 1 simple with single subterminal setule setae laterally, terminal seta microserrate with single subterminal setule. Uropod exopod of 2 articles, 0.9 times length of endopod; article 1 0.4 times article 2 length, with simple seta; article 2 with 2 simple and 1 plumose setae, terminal seta simple ( Figure 56G).

Description of male.

Paratype adult male, 4.7 mm, NIWA 80712. Carapace with single dorsal spine, posterior of mid-body; pseudorostral lobes 0.3 times carapace length; eyelobe 0.1 times carapace length, slender, without lenses, with small spine terminally. Pereonite 5 and pleonites with spines. Carapace, pereonites and pleonites covered in mucus and sediment ( Figures 57A–B).

Antennule peduncle article 1 longest, unarmed; article 2 0.6 times article 1 length, with 1 simple and 3 complex pedunculate setae, margin lined with fine hair-like setae; article 3 0.7 times article 2 length, with 1 complex pedunculate seta; main flagellum of 3 articles, with 2 aesthetascs and 2 simple setae; accessory flagellum of 1 article, with 1 simple and 1 complex pedunculate setae ( Figure 57C).

Antenna extending past posterior margin of uropod peduncle; peduncle of 5 articles, article 2 with simple seta, articles 4–5 with ranks of setae, incompletely circling articles; flagellum articles each with seta ( Figure 57D).

Maxilliped 3 covered in mucus and sediment ( Figure 57E).

Pereopod 1 basis 0.6 times length of all other articles together, with 3 plumose setae; ischium 0.4 times basis length, unarmed; merus 0.7 times ischium length, with 2 simple and 1 plumose setae; carpus 1.3 times merus length, with 2 simple setae; propodus 1.1 times carpus length, with 3 simple setae; dactylus 0.5 times propodus length, with 2 simple setae terminally; exopod equal to basis length, basal article unarmed, flagellum with plumoannulate setae ( Figure 58A).

Pereopod 2 basis 0.8 times length of all other articles together, with 2 plumose setae; ischium 0.05 times basis length, unarmed; merus 5.5 times ischium length, with plumose seta; carpus 1.5 times merus length, with 1 simple, 1 plumose and 1 microserrate setae; propodus 0.4 times carpus length, unarmed; dactylus 3.3 times propodus length, with 6 plumose setae and plumose seta terminally; exopod 1.1 times basis length, basal article with plumose seta, flagellum with plumo-annulate setae ( Figure 58B).

Pereopod 3 basis 1.7 times length of all other articles together, with 1 simple and 1 plumose setae; ischium 0.07 times basis length, with plumose seta; merus 1.5 times ischium length, with plumose seta; carpus 2.5 times merus length, with annulate seta; propodus 3.8 times carpus length, with annulate seta; dactylus 0.8 times propodus length, with 3 simple setae terminally; exopod 0.8 times basis length, basal article with plumose seta, flagellum with plumo-annulate setae ( Figure 58C).

Pereopod 4 basis 1.5 times length of all other articles together, with 2 complex pedunculate setae; ischium 0.07 times basis length, with plumose seta; merus 1.7 times ischium length, with plumose seta; carpus 3.2 times merus length, with 2 simple and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.8 times propodus length, with 3 simple setae terminally; exopod 0.9 times basis length, basal article with 1 plumose and 1 complex pedunculate setae, flagellum with plumo-annulate setae ( Figure 58D).

Pereopod 5 basis 0.7 times length of all other articles together, with 2 plumose and 2 complex pedunculate setae; ischium 0.2 times basis length, with plumose seta; merus equal to ischium length, with plumose seta; carpus 4.5 times merus length, with 1 simple and 1 annulate setae; propodus 0.2 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 3 simple setae terminally ( Figure 58E).

Uropod peduncles 3.4 times pleonite 6 length, with 11–12 microserrate setae medially, 3 simple setae laterally. Uropod endopod uniarticulate, 0.4 times peduncle length, with 8 microserrate with single subterminal setule setae medially, 8 complex pedunculate, 2 pedunculate and 1 microserrate with single subterminal setule setae laterally, terminal seta microserrate with single subterminal setule. Uropod exopod 0.8 times length of endopod; article 1 0.2 times article 2 length, unarmed; article 2 with 2 simple and 2 plumose setae, terminal seta simple ( Figure 58F).

Etymology. The new species is named from the Greek rhypax meaning dirty, in combination with ceros, meaning horn, meaning the dirty horned one, in reference to the single large dorsal spine on the carapace in combination with the fact that all specimens encountered were covered in mucus and fine sediment.

Remarks. The most similar species is Procampylaspis rhypakos , because both species are commonly encountered covered in a layer of mucus and fine sediment. The species can be differentiated by the large dorsal spine present on the carapace in P. rhypakoceros and the lack of any dorsal spine on the carapace in P. rhypakos .