Campylaspenis tangaroae, Gerken, 2012

Gerken, Sarah, 2012, 3524, Zootaxa 3524, pp. 1-124 : 23-30

Campylaspenis tangaroae n. sp.

Figures 12–15

Type material. Holotype adult male, NIWA 80656 , 42.6213°S, 175.9225°E – 42.6203°S, 175.9335°E, 1194–1199 m, 26 April 2007 . Paratype adult male, dissected, NIWA 80657 ; paratype subadult male, NIWA 80659 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . Paratype subadult female, dissected, NIWA 80658 , 0705 /160.

Other material examined. 3 subadult females, 3 subadult males, NIWA 79386 , 43.8363°S, 176.7092°E – 43.8330°S, 176.7127°E, 478–479 m, 5 April 2007 . 1 ovigerous female, 2 subadult females, NIWA 79388 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 3 subadult females, 3 juveniles, NIWA 79387 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 1 specimen, NIWA 80663 , 44.4862°S, 177.1413°E – 44.4841°S, 177.1416°E, 1235–1239 m, 6 April 2007 . 1 ovigerous female, 1 subadult female, NIWA 79389 , 0705 /160. 1 subadult male, NIWA 79390 , 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007 . 1 ovigerous female, 1 subadult female, NIWA 80664 , 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 sulcus, scattered weak tubercles and scattered red chromatophores. Male. With penial lobes without setae terminally.

Description of female.

Paratype subadult female, 3.7 mm, NIWA 80658. Carapace with sulcus, not bounded by distinct carinae, scattered weak tubercles and sparsely scattered red chromatophores, longer than pereonites and pleonites together; pseudorostral lobes 0.3 times carapace length; eyelobe present, without lenses; pereonite 1 free only dorsally, with dorsally directed lappet; pereonite 2 with dorsally directed lappet ( Figures 12A–B).

Antennule peduncle article 1 1.2 times length of articles 2 and 3 together, with simple seta; article 2 0.5 length of article 1, with 1 simple and 1 complex pedunculate setae; article 3 0.7 times length of article 2, with complex pedunculate setae distally; main flagellum of 3 articles, with 3 simple setae and 2 aesthetascs; accessory flagellum of 1 article, with complex pedunculate setae distally ( Figure 12C).

Antenna of 1 article, 0.9 times the length of article 1 of antennule, with terminal simple seta ( Figure 12D).

Mandible truncate, with 4–5 dentate setae medially, lacinia mobilis with 3 cusps, incisor slender, tip serrate, with fine hair-like setae ( Figure 12E).

Maxillule with 2 endites; outer endite with double row of stout dentate setae; inner endite with setae 5 setae; palp with 1 long microserrate seta and 1 short simple seta ( Figure 12F).

Maxilliped 1 basis 0.9 times length of merocarpus, with 2 hook and 2 plumose setae; merocarpus with small simple setae medially, lateral margin lined with fine hair-like setae, with pappose seta distally; dactylus minute, margins lined with fine hair-like setae, with simple seta terminally ( Figure 12G).

Maxilliped 2 basis 0.8 times length of all other articles together, with pappose seta medially; ischium absent; merus 0.4 times basis length, with pappose seta distally; carpus 0.6 times merus length, medial margin distal corner produced medially, with 2 simple setae; propodus 2.0 times carpus length, with hair-like setae laterally, distal margin produced as two long processes; dactylus 0.6 times propodus length, produced terminally as 3 processes, outer 2 long and inner process short ( Figure 12H).

Maxilliped 3 basis 0.7 times length of all other articles together, with 2 long plumose setae at distal corner, medial margin with 6 plumose setae; ischium 0.07 times basis length, medial margin produced as 3 teeth; merus 6.3 times ischium length, with 3 plumose and 3 simple setae, medial margin produced as several teeth distally; carpus 0.7 times merus length, with 3 plumose and 2 simple setae, lateral margin produced as strong teeth; propodus 1.2 times carpus length, with 2 pappose and 2 plumose setae; dactylus 0.7 times propodus length, with 3 setae terminally; exopod extending to midpoint of merus, basal article unarmed, flagellum with plumo-annulate setae ( Figure 13A).

Pereopod 1 basis 0.7 times length of all other articles together, with 3 plumose setae, margins produced as teeth distally; ischium 0.1 times basis length, with plumose seta, medial margin produced as tooth; merus 4.5 times ischium length, with 3 plumose and 8 simple setae, disto-lateral corner produced as tooth; carpus 0.8 times merus length, with 2 plumose and 6 simple setae, margins produced as teeth; propodus 0.9 times carpus length, with 3 plumose and 3 simple setae, margins produced as teeth; dactylus 0.5 times propodus length, with 6 setae terminally; exopod extending past ischium, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 13B).

Pereopod 2 basis 0.6 times length of all other articles together, with 1 plumose and 2 simple setae, lateral margin produced as teeth distally; ischium 0.03 times basis length, unarmed; merus 9 times ischium length, with 1 plumose and 1 simple setae; carpus 2.2 times merus length, with 5 simple setae; propodus 0.3 times carpus length, with simple seta; dactylus 5.7 times propodus length, with 8 simple setae, terminal seta broken off; exopod extending merus, basal article with 2 simple setae, flagellum with plumo-annulate setae ( Figure 13C).

Pereopod 3 basis 1.5 times length of all other articles together, with 10 simple and 2 complex pedunculate setae, produced proximally as bump; ischium 0.04 times basis length, with plumose seta; merus 3.3 times ischium length, with 2 simple setae; carpus 1.8 times merus length, with 1 plumose and 1 annulate setae; propodus 0.4 times carpus length, with annulate seta; dactylus 0.9 times propodus length, with 3 setae setae terminally; remnant exopod present as bump on basis, with 2 setae, no distinct articles ( Figure 13D).

Pereopod 4 basis 0.8 times length of all other articles together, with 5 simple setae; ischium 0.09 times basis length, with simple seta; merus 2.4 times ischium length, with 1 simple and 1 annulate setae; carpus 1.8 times merus length, with 1 simple and 1 annulate setae; propodus 0.4 times carpus length, with 1 annulate and 1 complex pedunculate setae; dactylus 0.9 times propodus length, with 3 setae terminally; exopod absent entirely, no remnant ( Figure 13E).

Pereopod 5 basis 0.5 times length of all other articles together, with 3 simple and 3 complex pedunculate setae; ischium 0.2 times basis length, with annulate seta; merus 1.8 times ischium length, with annulate seta; carpus 2.7 times merus length, with 1 plumose 2 simple and 1 annulate setae; propodus 0.3 times carpus length, with 1 annulate and 1 complex pedunculate setae; dactylus equal to propodus length, with 3 setae terminally ( Figure 13F).

Uropod peduncles 2.4 times pleonite 6 length, medial margins serrate, with 2–3 simple setae. Uropod endopod uniarticulate, 0.5 times peduncle length, medial margin serrate, with 2 simple setae, 1 seta with single subterminal setule, and 3 microserrate setae with single subterminal setule. Uropod exopod of 2 articles, 0.9 times length of endopod; article 1 0.3 times length of article 2, unarmed; article 2 with seta with single subterminal setule and simple terminal seta, terminal seta 1.2 times exopod length ( Figure 13G).

Description of male.

Holotype adult male, 3.8 mm, NIWA 80656, paratype adult male 3.9 mm, NIWA 80657. Carapace with sulcus, not bounded by distinct carinae, scattered weak tubercles and sparsely scattered red chromatophores, 0.7 times length of pereonites and pleonites together; pseudorostral lobes 0.3 times carapace length; eyelobe 0.05 times carapace length, without lenses; pereonite 1 free only dorsally, with dorsally directed lappet; pereonite 2 with dorsally directed lappet; pereonite 5 with pair of penes ventrally, penes longer and broader than basis of pereopod 5; all pleonites with lateral depression for antennal flagellum ( Figures 14A–D).

Antennule peduncle article 1 1.3 times length article 2, with 2 simple setae and fine hair-like setae proximally; article 2 0.8 times article 3 length, with complex pedunculate seta; article 3 0.8 times article 2 length, with 1 simple and 2 complex pedunculate setae distally; main flagellum of 3 articles, with 1 aesthetasc and 2 simple setae; accessory flagellum of 1 article, with 3 simple setae ( Figure 14E).

Antenna extending past uropod peduncles; peduncle of 5 articles, broken off on paratype ( Figure 14A).

Maxilla reduced to single endite, with 3 simple setae terminally ( Figure 14F).

Maxilliped 1 basis broken, with 2 simple and 2 hook setae; merocarpus with 8 simple setae and lateral margin lined with fine hair-like setae; dactylus absent ( Figure 14G).

Maxilliped 2 basis shorter than all other articles together, ischium 0.06 times basis length, unarmed; merus 5.5 times ischium length, unarmed; carpus 0.5 times merus length, produced as tooth distally on medial margin, with 3 simple setae; propodus 6 times carpus length, with 2 simple setae terminally; dactylus 0.5 times propodus length, produced as 4 stout teeth terminally ( Figure 14H).

Maxilliped 3 basis equal to length of all other articles together, with 3 plumose setae at distal corner, and 2 plumose setae medially; ischium 0.2 times basis length, with simple seta; merus 1.2 times ischium length, with 6 simple setae medially, pappose seta distally, with large tooth on distal margin; carpus 0.8 times merus length, with 3 simple and 1 plumose setae medially, 1 pappose seta laterally, lateral margin produced as 3 strong teeth; propodus 1.1 times carpus length, with 3 plumose setae medially, plumose seta laterally; dactylus 0.7 times propodus length, with 5 simple setae terminally; exopod extending to distal margin of ischium, basal article with plumose seta, flagellum with plumo-annulate setae ( Figure 15A).

Pereopod 2 basis 0.7 times length of all other articles together, with plumose seta laterally and plumose seta distally; ischium 0.04 times basis length, with plumose seta; merus 6.5 times ischium length, with plumose seta medially and 1 plumose and 1 simple setae laterally, lateral margin produced as teeth; carpus 1.2 times merus length, with 2 plumose and 2 simple setae medially and 1 plumose and 1 simple setae laterally; propodus 0.4 times carpus length, with complex pedunculate seta; dactylus 5.7 times propodus length, with 8 simple setae, terminal seta broken; exopod extending to distal margin of merus, basal article with 1 plumose and 1 simple setae, flagellum with plumo-annulate setae ( Figure 15B).

Pereopod 4 basis 1.4 times length of all other articles together, with simple seta; ischium 0.05 times basis length, with 2 simple setae; merus 3 times ischium length, with simple seta; carpus 2 times merus length, with 2 simple and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.7 times propodus length, with 2 setae terminally; exopod extending past distal margin of ischium, basal article unarmed, flagellum with plumo-annulate setae ( Figure 15C).

Pereopod 5 basis 0.8 times length of all other articles together, with 2 simple and 1 annulate setae, with penial lobe attached proximally; ischium 0.1 times basis length, with annulate seta; merus 1.6 ischium length, with 1 simple and 1 annulate setae; carpus 3 times merus length, with 1 simple and 1 annulate setae; propodus 0.3 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 3 setae terminally ( Figure 14C–D, 15D).

Uropod peduncles 2.7 times pleonite 6 length, with 4 pappose, 5 simple, and 4–5 microserrate with single subterminal setule setae medially, pappose and simple setae are in opposing pairs, margins weakly serrate. Uropod endopod uniarticulate, 0.5 times peduncle length, with 9 microserrate setae with single subterminal setules medially and 2 microserrate setae with single subterminal setules terminally. Uropod exopod 0.8 times length of endopod; article 1 0.4 times length of article 2, unarmed; article 2 with 1 plumose, 2 pedunculate and 2 microserrate with single subterminal setule setae, terminal seta microserrate with single subterminal setule ( Figure 15E).

Etymology. The species is named tangaroae , for the vessel RV Tangaroa which undertook the Oceans 20/20 voyages that collected the specimens.

Remarks. The propodus and dactylus of maxilliped 2 vary a little between the male and the female. The female has two large setae terminally on the propodus, and one of these setae is reduced in the male to a slender seta. The dactylus is produced as 3 teeth in the female, with the central tooth smaller than the outer pair, while in the male the dactylus is produced as 4 equal teeth.

This species is easily differentiated from the only other species in the genus by the morphology of the penial lobes in the male. In Campylaspenis rowei the penial lobes have setae terminally, while in C. tangaroae the penial lobes are without setae. In addition, the description of C. rowei states that there are 4 lateral carinae on the carapace, while in C. tangaroae there are no carinae on the carapace.

The most similar species of Campylaspis from New Zealand waters are C. apheles and C. rufus , which both possess a smooth carapace, unlike C. tangaroae , and C. normani , which has a weak sulcus. In C. apheles , the uropod rami are equal or subequal, while in C. tangaroae the uropod exopod is shorter than the endopod. In C. rufus , the female has many setae medially on the uropod exopod, and both males and females are entirely without a sulcus on the carapace, while in C. tangaroae the female has only 2 setae medially on the uropod endopod, and both have a distinct sulcus. Also, both sexes in C. rufus are covered in red chromatophores, giving the entire body and appendages a red appearance, while in C. tangaroae there are only scattered chromatophores in both sexes. In C. normani , the female has rudimentary exopods on pereopods 3–4, while there are no exopods on pereopods 3–4 in the female of C. tangaroae . The male of C. normani is unknown at present, but is expected not to have penial lobes, differentiating it from the male of C. tangaroae .