Procampylaspis chathamensis, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 93-96

Procampylaspis chathamensis n. sp.

Figures 53–54

Type material. Holotype subadult female, NIWA 80715 , paratype subadult female, dissected, NIWA 80716 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007.

Material examined. 1 subadult female, NIWA 79374 , 44.4845°S, 177.1425°E – 44.4845°S, 177.1425°E, 1241 m, 6 April 2007 . 2 juveniles, NIWA 79375 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 9 subadult females, 11 juveniles, NIWA 79376 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 3 subadult females, 1 subadult male, 5 juveniles, NIWA 79377 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 .

Diagnosis. Females and subadult males. Carapace with single large dorsal spine; eyelobe absent. Female uropod peduncle more than twice as long pleonite 6. Specimens not coated in mucus and fine sediment. Male. Adult unknown.

Description of female.

Holotype subadult female, 4.7 mm, NIWA 80715. Paratype subadult female, 4.8 mm, NIWA 80716. Carapace smooth, untextured, shiny, with single large mid-dorsal spine; pseudorostral lobes 0.2 carapace length; eyelobe absent; carapace 3.33 times length of pereonites together ( Figures 53A–B).

Antennule peduncle article 1 equal to articles 2 and 3 together, with 2 setae; article 2 1.4 times length of article 3, with 3 simple and 2 complex pedunculate setae; article 3 unarmed; main flagellum of 2 articles, broken, setae unknown; accessory flagellum of 1 article, with 4 complex pedunculate setae ( Figure 53C).

Mandible navicular, with 5 microserrate setae medially, lacinia mobilis with 2 cusps ( Figure 53D).

Maxillule with 2 endites; outer endite with 6 dentate and 4 simple setae; inner endite with 4 setae; palp with single seta ( Figure 53E).

Maxilla with 3 endites; broad endite with few simple setae; medial narrow endite with 2 microserrate setae terminally; distal narrow endite with 3 microserrate setae terminally ( Figure 53F).

Maxilliped 1 basis produced as lobe medially, with 3 pappose, 2 hook and 2 simple setae; ischium absent; merus with few simple setae; carpus 3.0x merus length, with 4 beak setae, few simple, and 1 plumose setae; propodus 0.4x carpus length, with 4 simple and 1 plumose setae; dactylus 0.3 propodus length, with 2 simple setae terminally ( Figure 53G).

Maxilliped 2 basis broken, with 2 plumose setae; ischium without setae; merus with plumose seta; carpus 0.8x merus length, with 2 simple and 2 plumose setae; propodus 1.2x carpus length, with 2 simple and 1 plumose setae; dactylus 1.1x propodus length, with 4 medially oriented spines and terminal claw ( Figure 53H).

Maxilliped 3 basis 1.3 times length of all other articles together, with plumose seta; ischium 0.07 times basis length, unarmed; merus 2.8 times ischium length, with plumose seta; carpus 0.9 times merus length, with plumose seta; propodus 1.5 times carpus length, unarmed; dactylus 0.5 times propodus length, with 3 setae terminally; exopod 0.8 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 54A).

Pereopod 1 basis 0.7 times length of all other articles together, with 3 plumose setae; ischium 0.4 times basis length, with plumose seta; merus 1.1 times ischium length, with 4 simple and 2 plumose setae; carpus 0.7 times merus length, with 2 plumose setae, lateral margin lined with fine hair-like setae; propodus 1.3 times carpus length, with 3 simple setae, article covered in fine hair-like setae; dactylus 0.5 times propodus length, with 6 simple setae terminally, margins lined with fine hair-like setae; exopod equal to basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 54B).

Pereopod 2 basis equal to length of all other articles together, with 2 plumose setae; ischium 0.04 times basis length, unarmed; merus 4.5 times ischium length, with 4 simple and 1 plumose setae; carpus 1.9 times merus length, with 2 simple, 1 plumose and 1 pappose setae; propodus 0.4 times carpus length, with simple seta; dactylus 3.3 times propodus length, with 7 plumose setae and plumose seta terminally; exopod 1.1 times basis length, basal article with unarmed, flagellum with plumo-annulate setae ( Figure 54C).

Pereopod 3 basis 1.3 times length of all other articles together, with 2 plumose setae; ischium 0.09 times basis length, with plumose seta; merus 1.8 times ischium length, with plumose seta; carpus 2.4 times merus length, with 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 54D).

Pereopod 4 basis broken, with 4 plumose setae; ischium unarmed; merus 1.6 times ischium length, with plumose seta; carpus 3.1 times merus length, with annulate seta; propodus 0.3 times carpus length, with annulate seta; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 54E).

Pereopod 5 basis broken, with plumose seta; ischium unarmed; merus 1.3 times ischium length, with plumose seta; carpus 3.0 times merus length, with 1 plumose, 1 pedunculate and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 54F).

Uropod peduncles 2.3 times pleonite 6 length, with fine hair-like setae. Uropod endopod uniarticulate, 0.6 times peduncle length, with 3 simple setae medially, 4–5 pedunculate and 1 simple setae laterally, terminal seta simple. Uropod exopod of 2 articles, 0.8 times length of endopod; article 1 0.4 times article 2 length, unarmed; article 2 with 2 simple setae laterally, terminal seta simple, margins lined with fine hair-like setae ( Figure 54G).

Etymology. The new species is named chathamensis for the locality of collection, Chatham Rise.

Remarks. There are two other species of Procampylaspis known from the waters of New Zealand, P. rhypakos and P. rhypakoceros . Procampylaspis chathamensis can easily be differentiated from the other two species. Procampylaspis rhypakos does not have a single dorsal spine on the carapace, while P. chathamensis has a single large dorsal spine on the carapace. Procampylaspis rhypakoceros does have a single large dorsal spine on the carapace; however, the length of the female uropod peduncle is less than or equal to twice the length of pleonite 6, while in P. chathamensis the female uropod peduncle is more than twice the length of pleonite 6. In addition, P. chathamensis is shiny and less likely to be covered in a thick layer of mucus and fine sediment than the other two species, and lacks an eyelobe.