Cyclaspis petrescui, Gerken, Sarah, 2013

Gerken, Sarah, 2013, New Zealand Bodotriidae (Crustacea: Cumacea), Zootaxa 3630 (1), pp. 1-38 : 23-29

Cyclaspis petrescui n. sp.

Figures 11–14

Type material. Holotype preparatory female, NIWA 80738; Paratype subadult male, dissected, NIWA 80739; Paratype adult male, dissected, NIWA 80740; 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007.

Other material examined. 4 juveniles, NIWA 46237, 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007. 1 juvenile, NIWA 84498, 43.3071°S, 176.1058°W – 43.3121°S, 176.1064°W, 209 m, 14 April 2007.

Diagnosis. Female. Carapace finely reticulated; 0.7 times as high as long; eyelobe with distinct lenses; antennal notch present; anteroventral corner smooth. Pereonite 1 entirely concealed. Pereonite 2 not produced dorsally. Pleon with lateral articular pegs, dorsal keel. Uropod peduncles much shorter than pleonite 6; endopod longer than exopod; endopod with medial margin serrate, single stout simple seta; exopod with weakly serrate margins, terminal seta short, stout and simple. Male. Carapace less arched than in female. Uropod peduncles longer than pleonite 6.

Description of female. Holotype preparatory female, 6.1 mm, NIWA 80738. Carapace finely reticulated; pseudorostral lobes 0.4 times carapace length; eye lobe 0.1 times carapace length, with distinct lenses; carapace 1.5 times pereonites. Carapace, pereon and pleon with dorsal keel. Pleon with lateral articular pegs ( Figure 11 A).

Description of subadult male. Paratype subadult male, 6.1 mm, NIWA 80739. Carapace finely reticulated; pseudorostral lobes 0.4 times carapace length; eye lobe 0.1 times carapace length, with distinct lenses; carapace 1.5 times pereonites. Carapace, pereon and pleon with dorsal keel. Pleon with lateral articular pegs ( Figure 11 B).

Antennule peduncle article 1 longest, unarmed; article 2 0.6 times article 1 length, with simple seta; article 3 equal to article 2 length, with 2 simple and 1 complex pedunculate setae; main flagellum of 3 articles, with 2 aesthetascs and 4 simple setae; accessory flagellum of 1 article, with 2 simple setae ( Figure 11 C).

Mandible navicular ( Figure 11 D).

Maxillule with 2 endites; outer endite broad, with 2 rows of stout simple setae terminally, lateral pappose seta; inner endite with 2 simple, 1 microserrate and 1 tricuspid setae; palp with 2 microserrate setae ( Figure 11 E).

Maxilla with 3 endites; broad endite with simple and pappose setae distally, medial distal margin with plumose setae, medial margin with row of setae, with 2 pappose setae, central face with groups of fine hairlike setae; medial narrow endite with 6 microserrate setae terminally; distal narrow endite with 6 microserrate setae terminally; both narrow endites extending past distal margin of broad endite ( Figure 11 F).

Maxilliped 1 basis produced as broad lobe medially, with 5 pappose setae on margin, 2 hook 3 simple and 1 stout bicuspid setae distally; ischium absent; merus with pappose seta medially; carpus 1.9 times merus length, with 5 beak and 4 plumose setae medially; propodus 0.5 times carpus length, with 3 pappose setae distally; dactylus 0.4 times propodus length, with 3 simple setae terminally ( Figure 11 G).

Maxilliped 2 basis 1.7 times length of all other articles together, with 6 plumose setae laterally, thickly plumose seta medially; ischium 0.02 times basis length, unarmed; merus 0.2 times basis length, with thickly plumose seta; carpus 1.3 times merus length, with 6 plumose setae medially, plumose seta laterally; propodus 0.7 times carpus length, with 7 plumose setae distally; dactylus 0.6 times propodus length,with 4 simple setae terminally ( Figure 11 H).

Pereopod 1 basis equal to length of all other articles together, with 2 plumose setae distally; ischium 0.06 times basis length, unarmed; merus 3 times ischium length, unarmed; carpus 1.6 times merus length, unarmed; propodus 1.1 times carpus length, with simple seta; dactylus 0.6 times propodus length, with 5 simple setae terminally; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 12 A).

Pereopod 2 basis 0.9 times length of all other articles together, unarmed; ischium 0.08 times basis length, with plumose seta; merus 4 times ischium length, with plumose seta; carpus 0.8 times merus length, with 2 microserrate setae with single subterminal setule; propodus 0.5 times carpus length, unarmed; dactylus 2.6 times propodus length, with 3 microserrate setae with single subterminal setule terminally ( Figure 12 B).

Pereopod 3 basis 1.2 times length of all other articles together, with plumose seta distally; ischium 0.07 times basis length, with annulate seta; merus 3 times ischium length, with annulate seta; carpus 1.6 times merus length, with 1 simple and 3 annulate setae, margin serrate; propodus 0.4 times carpus length, with annulate seta; dactylus 0.8 times propodus length, with simple seta terminally ( Figure 12 C).

Pereopod 4 basis 0.8 times length of all other articles together, with 2 simple and 1 plumose setae; ischium 0.2 times basis length, with annulate seta; merus 2 times ischium length, with annulate seta; carpus 1.4 times merus length, with 3 annulate setae; propodus 0.6 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with 2 simple setae terminally ( Figure 12 D).

Pereopod 5 basis with annulate seta; ischium with annulate seta; merus 2 times ischium length, with annulate seta; carpus 1.3 times merus length, with 2 annulate setae; propodus 0.5 times carpus length, with 1 simple and 1 annulate setae; dactylus 0.7 times propodus length, with 3 simple setae terminally ( Figure 12 E).

Uropod peduncles 0.6 times pleonite 6 length, unarmed. Uropod endopod uniarticulate, 1.5 times peduncle length, medial margin strongly serrate with stout simple seta, lateral margin weakly serrate. Uropod exopod of 2 articles, 0.95 times length of endopod; article 1 0.2 times length of article 2, unarmed; article 2 with weakly serrate lateral margin, terminal seta short and simple ( Figure 12 F).

Description of adult male. Paratype adult male, 9.2 mm, NIWA 80740. Carapace antennal notch less deep than in female and subadult male; pseudorostral lobes 0.4 times carapace length; eye lobe 0.1 times carapace length, with large, obvious lenses; carapace 1.9 times length of pereonites together. Pereonite 1 completely concealed ( Figure 13 A–B).

Antennule broken; peduncle article 1 with fine hairlike setae on margins distally; article 2 with complex pedunculate seta; article 3 equal to length of article 2, with complex pedunculate seta and aesthetasc distally; main flagellum of 3 articles, with 3 aesthetascs; accessory flagellum of 1 article, with 3 simple setae ( Figure 13 C).

Antenna broken during dissection; peduncle article 5 with ranks of simple setae; antennal flagellum of short articles with 1–2 setae per article, extending past uropods ( Figure 13 A, 13D).

Maxilliped 3 basis 2.2 times length of all other articles together, lateral margin lined with fine hairlike setae distally, produced as lobe extending nearly to lateral corner of merus–carpus border, with 2 plumose setae, with pappose seta medially; ischium 0.1 times basis length, with 2 pappose setae medially; merus equal to ischium length, with plumose seta laterally; merus carpus border diagonal, carpus 0.8 times merus length, unarmed; propodus equal to carpus length, with 2 plumose setae medially; dactylus 0.7 times propodus length, with 3 simple setae terminally; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 13 E).

Pereopod 1 basis with 3 simple setae proximally, 2 plumose setae distally; ischium 0.06 times basis length, unarmed; merus 2.2 times ischium length, unarmed; carpus 1.8 times merus length, with simple seta; propodus 1.3 times carpus length, with simple seta; dactylus broken; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 13 F).

Pereopod 2 basis broken, unarmed; ischium with plumose seta; merus 5 times ischium length, with plumose seta; carpus 0.9 times merus length, with 3 microserrate setae with single subterminal setule; propodus 0.3 times carpus length, unarmed; dactylus 4.3 times propodus length, with 3 microserrate setae with single subterminal setule terminally ( Figure 14 A).

Pereopod 3 basis broken, with 2 plumose setae; ischium with annulate seta; merus 2.6 times ischium length, with annulate seta; carpus 1.2 times merus length, with 3 annulate seta; propodus 0.6 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with 2 simple setae terminally ( Figure 14 B).

Pereopod 4 basis 0.8 times length of all other articles together, with complex pedunculate seta; ischium 0.1 times basis length, unarmed; merus 2.2 times ischium length, with annulate seta; carpus 1.4 times merus length, with 3 annulate setae; propodus 0.5 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with 2 simple setae terminally ( Figure 14 C).

Pereopod 5 basis 0.7 times length of all other articles together, with annulate seta; ischium 0.1 times basis length, with annulate seta; merus 2.8 times ischium length, with annulate seta; carpus 1.3 times merus length, with 5 annulate setae; propodus 0.6 times carpus length, with annulate seta; dactylus 0.5 times propodus length, with 2 simple setae terminally ( Figure 14 D).

Pleopod 1 longest; peduncle with plumose setae medially; endopod uniarticulate, process weak, exopod biarticulate, both with many long plumose setae ( Figure 14 E).

Pleopod 5 shortest; peduncle with plumose setae medially; endopod uniarticulate, process weak, exopod biarticulate, both with long many long plumose setae ( Figure 14 F).

Uropod peduncles 1.1 times pleonite 6 length, medial margin lined with long plumose setae. Uropod endopod uniarticulate, medial margin with long plumose setae proximally, single stout seta with single subterminal setule distally; broken. Uropod exopods broken ( Figure 14 G).

Etymology. The species is named for Dr. Iorgu Petrescu, for his excellent and tireless efforts in cumacean systematics.

Remarks.The only other species in New Zealand waters with a smooth carapace and lenses in the eyelobe is Cyclaspis levis . However, the new species can be differentiated from C. levis by the fine ornamentation of the carapace, the carapace proportions, pleon ornamentation, uropod proportions and uropod setation. In C. levis the carapace is finely pitted, 0.5 times as long as high, the pleon has a dorsal and lateral keels, the uropod peduncles are equal to or longer than pleonite 6 in the female, and there are more setae on the uropod rami. In comparion, in C. petrescui the carapace is finely reticulated, 0.7 times as long as high, the pleon has a dorsal keel only, the uropod peduncles are shorter than pleonite 6 in the female and subadult male, and there are fewer setae on the uropod rami.

Figures

FIGURE 11. Cyclaspis petrescui n. sp. Holotype preparatory female, NIWA 80738. A, side view. Paratype subadult male, NIWA 80739. B, dorsal view; C, antennule, D, mandible; E, maxillule; F, maxilla; G, maxilliped 1; H, maxilliped 2.

FIGURE 12. Cyclaspis petrescui n. sp. Paratype subadult male, NIWA 80739. A, pereopod 1; B, pereopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, pleonite 6 and uropods.

FIGURE 13. Cyclaspis petrescui n. sp. Paratype adult male, NIWA 80740. A, dorsal view; B, side view; C, antennule; D, antenna; E, maxilliped 3; F, pereopod 1.

FIGURE 14. Cyclaspis petrescui n. sp. Paratype adult male, NIWA 80740. A, pereopod 2; B, pereopod 3; C, pereopod 4; D, pereopod 5; E, pleopod 1; F, pleopod 5; G, pleonite 6 and uropods.