Campylaspis hatchae, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 41-47

Campylaspis hatchae n. sp.

Figures 22–25

Type material. Holotype subadult female, NIWA 80702 , paratype subadult female, dissected, NIWA 80703 , paratype adult male, dissected, NIWA 80683 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007.

Other material examined. 3 subadult females, NIWA 79343 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 1 subadult, NIWA 79344 , 44.1208°S, 174.8432°E – 44.1242°S, 174.8448°E, 512–513 m, 4 April 2007 .

Diagnosis. Females and subadult males. Carapace with sulcus, not bounded by carinae, with scattered tubercles and small spines, with medial carina dorsally on posterior part of carapace; pseudorostrum not dorsally directed. Carapace, pereonites and pleonites without red chromatophores. Pereonites 2–5 free, with spines dorsally. Pereopod 2 dactylus normal, terminal plumose seta long. Uropod peduncles 2.3 times length of pleonite 6. Male. Carapace without tubercles, less vaulted than in female, with red scattered red chromatophores on carapace, pereon and pleon. Uropod peduncles 3.6 times pleonite 6 length, more setose than in female.

Description of female.

Holotype subadult female, 4.5 mm, NIWA 80702 . Paratype subadult female, 4.0 mm, NIWA 80703 . Carapace with sulcus, not bounded by carinae, with scattered tubercles and small spines; pseudorostral lobes 0.3 times carapace length; eyelobe 0.03 times carapace length, without lenses; pereonites 2–5 free, with spines dorsally ( Figures 22A–B) .

Antennule peduncle article 1 longest, unarmed; article 2 0.7 times length of article 1, unarmed; article 3 0.9 times article 2 length, unarmed; main flagellum broken; accessory flagellum of 1 article, with 2 simple and 2 complex pedunculate setae ( Figure 22C).

Mandible truncate, with 4 microserrate setae medially, lacinia mobilis with 2 cusps ( Figure 22D).

Maxillule with 2 endites; outer endite with double row of stout simple setae; inner endite with 1 simple, 2 microserrate and 1 dentate setae; palp with 2 microserrate setae ( Figure 22E).

Maxilla reduced to single endite, with 7 simple setae ( Figure 22F).

Maxilliped 1 basis with plumose seta; merocarpus with 5 simple and 1 plumose setae, lateral margin lined with fine hair-like setae; dactylus with 2 simple setae terminally ( Figure 22G).

Maxilliped 2 basis 0.8 times length of all other articles together, medial distal corner with unusual club like sensory organ; ischium absent; merus 0.3 times basis length, with plumose seta; carpus 1.2 times merus length, with plumose seta, medial margin produced as tooth; propodus 0.9 times carpus length, with plumose seta, distal corner produced as projections; dactylus 0.9 times propodus length, produced as 3 teeth terminally, central tooth short, outer pair equal in length ( Figure 22H).

Maxilliped 3 basis 0.7 times length of all other articles together, with 2 plumose setae medially, distal corner with 2 plumose setae, medial margin produced as tooth distally and lined with fine hair-like setae; ischium 0.1 times basis length, unarmed; merus 5.8 times ischium length, with 5 plumose setae medially, plumose seta laterally, lateral margin produced as tooth distally; carpus 0.4 times merus length, with 3 simple and 2 plumose setae medially, plumose seta laterally medial margin serrate and lined with fine hair-like setae, lateral margin produced as tooth; propodus 0.9 times carpus length, with 2 plumose setae medially, plumose seta laterally; dactylus 0.9 times propodus length, with 3 simple setae terminally; exopod equal to basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 23A).

Pereopod 1 basis equal to length of all other articles together, with 3 simple and 4 plumose setae; ischium 0.09 times basis length, with plumose seta; merus 3.2 times ischium length, with 3 simple and 1 plumose setae, lateral distal corner produced as tooth; carpus 1.1 times merus length, with 2 simple setae, medial margin produced as 2 teeth proximally, lateral margin serrate; propodus 0.7 times carpus length, with 2 simple and 4 plumose setae; dactylus 0.9 times propodus length, with simple seta and 5 simple setae terminally; exopod 0.8 basis length, basal article with 3 simple setae flagellum with plumo-annulate setae ( Figure 23B).

Pereopod 2 basis 0.7 times length of all other articles together, with 2 simple and 1 plumose setae, margins serrate; ischium 0.04 times basis length, unarmed; merus 4.0 times ischium length, with 2 plumose setae; carpus 2.5 times merus length, with 5 simple and 1 plumose setae; propodus 0.4 times carpus length, unarmed; dactylus 5.0 times propodus length, with 4 simple and 3 plumose setae, 4 plumose setae terminally; exopod 1.1 times basis length, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 23C).

Pereopod 3 basis 1.5 times length of all other articles together, with 1 simple, 3 plumose and 2 complex pedunculate setae; ischium 0.08 times basis length, with plumo-annulate seta; merus 1.8t times ischium length, with plumo-annulate seta; carpus 2.0 times merus length, with 1 simple, 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 23D).

Pereopod 4 basis 1.1 times length of all other articles together, with 6 simple and 2 complex pedunculate setae; ischium 0.1 times basis length, with plumose seta; merus 1.6 times ischium length, with annulate seta; carpus 2.4 times merus length, with 1 simple, 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.9 times propodus length, with 3 simple setae terminally ( Figure 23E).

Pereopod 5 basis 0.6 times length of all other articles together, with 1 simple and 2 complex pedunculate setae; ischium 0.1 times basis length, with plumose seta; merus 3.0 times ischium length, with plumose seta; carpus 2.0 times merus length, with 1 simple, 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with 3 simple setae terminally ( Figure 23F).

Uropod peduncles 2.3 times pleonite 6 length, with 5–6 simple setae, margins strongly serrate. Uropod endopod uniarticulate, 0.5 times peduncle length, margins strongly serrate, with 3 simple setae medially, terminal seta simple. Uropod exopod of 2 articles, equal to length of endopod; article 1 0.3 times article 2 length, unarmed; article 2 with 0–1 simple seta, terminal seta with single subterminal setule ( Figure 23G).

Description of male.

Paratype adult male, 3.8 mm, NIWA 80683 . Carapace with weak sulcus, not bounded by carinae, with scattered weak tubercles and no spines; pseudorostral lobes 0.3 times carapace length; eyelobe absent. Pereonites 2–5 free, pereonite 3 with pair of spines dorsally. Carapace, pereonites and pleonites with scattered red chromatophores ( Figures 24A–B) .

Antennule peduncle article 1 longest, margin lined with fine hair-like setae; article 2 0.6 times article 1 length, with pedunculate seta; article 3 0.8 times article 2 length, with pedunculate seta; main flagellum of 2 articles, with 2 aethetascs, 3 simple and 1 pedunculate setae; accessory flagellum of 1 article, with 3 simple setae ( Figure 24C).

Antenna not extending to posterior border of carapace; peduncle of 5 articles; articles 4–5 very setose, with ranks of setae incompletely circling articles; flagellum with 15 articles, each with 3–4 setae ( Figure 24D)

Maxilliped 1 basis with 3 simple setae; merocarpus with 4 simple setae and margins lined with fine hair-like setae; dactylus with 2 simple setae terminally ( Figure 24E).

Maxilliped 2 basis with unusual club like sensory organ at distal medial corner, ischium absent; merus with plumose seta; carpus equal to merus length, with 1 simple and 1 plumose setae, medial margin produced as strong tooth; propodus 1.2 times carpus length, with 2 stout setae distally, medial margin produced as strong tooth; dactylus equal to propodus length, produced as 33 teeth terminally, central tooth short, outer pair equal in length ( Figure 24F).

Maxilliped 3 basis equal to length of all other articles together, with 2 pappose setae medially, distal corner with 2 plumose setae, medial corner produced as 3 teeth; ischium 0.04 times basis length, medial margin produced as strong tooth; merus 11.5 times ischium length, with 3 simple and 2 plumose setae medially, plumose seta laterally, medial and lateral distal corners each produced as strong tooth; carpus 0.4 times merus length, with 3 simple and 2 plumose setae medially, plumose seta laterally, lateral margin serrate; propodus 1.2 times carpus length, with 2 plumose setae; dactylus 0.5 times propodus length, with 5 simple setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 25A).

Pereopod 1 basis 0.9 times length of all other articles together, with 2 plumose setae, margin lined with fine hair-like setae; ischium 0.1 times basis length, with plumose seta, medial margin produced as 2 strong teeth; merus 2.0 times ischium length, with 4 plumose setae, distal lateral corner produced as tooth; carpus 1.1times merus length, with 4 plumose setae, margins with strong teeth; propodus 0.9 times carpus length, with 5 plumose setae; dactylus 0.7 times propodus length, with 4 simple setae terminally; exopod 0.9 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 25B).

Pereopod 2 basis shorter than all other articles together, with 2 simple and 2 plumose setae; ischium 0.05 times basis length, unarmed; merus 4.5 times ischium length, with 1 simple and 3 plumose setae; carpus 2.3 times merus length, with 2 microserrate and 2 plumose setae; propodus 0.4 times carpus length, unarmed; dactylus broken; exopod broken ( Figure 25C).

Pereopod 3 basis 1.6 times length of all other articles together, with 1 simple and 2 pappose setae; ischium 0.08 times basis length, with 1 plumose and 1 annulate setae; merus 1.5 times ischium length, with annulate seta; carpus 2.5 times merus length, with annulate seta; propodus 0.3 times carpus length, with 1 annulate and 1 complex pedunculate setae; dactylus 0.8 times propodus length, with 3 simple setae terminally; exopod broken ( Figure 25D).

Pereopod 4 basis 1.1 times length of all other articles together, with pappose seta; ischium 0.1 times basis length, with annulate seta; merus 1.2 times ischium length, with annulate seta; carpus 2.7 times merus length, with annulate seta; propodus 0.3 times carpus length, with 1 annulate and 1 complex pedunculate setae; dactylus 0.8 times propodus length, with 3 simple setae terminally; exopod 1.1 times basis length, basal article unarmed, flagellum with plumo-annulate setae ( Figure 25E).

Pereopod 5 basis 0.7 times length of all other articles together, with 1 simple and 2 complex pedunculate setae; ischium 0.1 times basis length, with plumose seta; merus 1.7 times ischium length, with plumose seta; carpus 2.8 times merus length, with 1 simple and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus equal to propodus length, 3 simple terminally ( Figure 25F).

Uropod peduncles 3.6 times pleonite 6 length, with 8 microserrate setae with single subterminal setules medially, margin serrate proximally. Uropod endopod uniarticulate, 0.5 times peduncle length; with 7 microserrate setae with single subterminal setules medially, terminal seta simple with single subterminal setule. Uropod exopod 0.7 times length of endopod; article 1 0.2 times article 2 length, unarmed; article 2 with 2 simple and 1 complex pedunculate setae, terminal seta simple ( Figure 25G).

Etymology. The species is named for Martha Hatch upon her retirement from the University of Alaska Anchorage in recognition of her tireless efforts to improve research and science teaching at the University.

Remarks. Campylaspis hatchae is most similar to C. millsae and C. sculptaspinosa , in that all three species have a sulcus and at least some spines dorsally on the carapace. However, C. hatchae has a weak sulcus, not bounded by carinae, and few spines dorsally on the carapace along with a few tubercles. Campylaspis millsae has a deep sulcus bounded by carinae, along with a pair of enlarged tubercles near the frontal lobe/ pseudorostral suture. Campylaspis sculptaspinosa also has a deep sulcus bounded by carinae and many spines all over the carapace. In addition, C. hatchae is unique among the New Zealand Campylaspis in possessing an unusual sensory organ on the basis of maxilliped 2, similar to C. selvakumarani ( Băcescu & Muradian 1974) .