Apocuma sculpta, Gerken, Sarah, 2013

Gerken, Sarah, 2013, New Zealand Bodotriidae (Crustacea: Cumacea), Zootaxa 3630 (1), pp. 1-38 : 6-10

Apocuma sculpta n. sp.

Figures 3–4

Type material. Holotype ovigerous female, NIWA 45999, 36.9202°S, 167.5302°E – 36.9120°S, 167.5325°E, 1207–1213 m, 30 May 2007; Paratype ovigerous female, dissected, NIWA 45998, 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007.

Other material examined. 2 juveniles, 1 manca, NIWA 46001, 43.2903°S, 175.5522°W – 43.2933°S, 175.5630°W, 638–644, 15 April 2007. 1 subadult male, NIWA 84454, 39.1087°S, 168.2819°E – 39.1119°S, 168.2799°E, 559 m, 2 June 2007. 1 juvenile, NIWA 84456, 40.1277°S, 170.2140°E – 40.1352°S, 170.2090°E, 803–805 m, 5 June 2007. 1 ovigerous female, 1 subadult female, 2 juveniles, NIWA 46000, 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007. 4 juveniles, 5 mancae, NIWA 84455, 43.5300°S, 178.5048°E – 43.5363°S, 178.5118°E, 346 m, 24 April 2007. 1 ovigerous female, 1 subadult male, 5 mancae, NIWA 46004, 40.8800°S, 170.8555°E – 40.8883°S, 170.8565°E, 529–534 m, 6 June 2007.

Diagnosis. Female. Carapace pitted, expanded ventrolaterally, with deep lateral depression continuous around carapace, posterior part of carapace expanded dorsally, with strong medial dorsal keel. Pereonites and pleonites with dorsal keel extending to pleonite 6. Pereopod 5 carpus 0.6 times basis length. Male. Adult unknown.

Description of ovigerous female. Holotype ovigerous female, 5.2 mm, NIWA 45999. Paratype ovigerous female, 3.9 mm, NIWA 45998. Carapace strongly sculptured with strong ridges and bumps, expanded dorsally posteriorly, expanded ventrolaterally, sulcus present, anterolateral corner strongly produced and serrate, with strong horizontal keel from anterolateral corner to posterior border of carapace, additional incomplete keel dorsal of sulcus, entire carapace covered in minute pits, very strong dorsal medial ridge continuing from carapace through pereon and pleon, narrowing on pleonite 5–6; pseudorostral lobes 0.3 times carapace length; eye lobe without lenses, broad, 0.04 times carapace length; carapace 3.0 times pereonites together; pleon shorter than carapace and pereonites together ( Figures 3 A–B).

Antennule peduncle article 1 longest, unarmed; article 2 0.4 times article 1 length, with 1 simple and 2 pedunculate setae; article 3 0.6 times article 2 length with 2 pedunculate setae; main flagellum of 2 articles, with 2 aesthetascs; accessory flagellum of one article, with 6 simple setae ( Figure 3 C).

Mandible navicular, lacinia mobilis with 4 cusps ( Figure 3 D).

Maxillule with 2 endites; outer endite broad, with 8 stout setae terminally; inner endite with 2 simple, 1 tricuspid and 1 microserrate setae; palp with 2 microserrate setae ( Figure 3 E).

Maxilla with 3 endites; broad endite with simple setae distally, 2 pappose setae at disto–medial corner, row of setae medially; medial narrow endite with 3 microserrate setae terminally; distal narrow endite with 4 microserrate setae terminally; both narrow endites extending to distal margin of broad endite ( Figure 3 F).

Maxilliped 1 basis 1.2 times length of all other articles together, produced as lobe medially, lobe with simple and hook setae; ischium absent; merus 0.1 times basis length, with 2 simple setae medially, pappose seta laterally; carpus 2.8 times merus length, with simple and 6 beak setae medially, pappose seta laterally; propodus 0.4 times carpus length, with 3 simple, 2 microserrate and 1 pappose setae; dactylus 0.8 times propodus length, with 3 simple setae terminally ( Figure 3 G).

Maxilliped 2 basis equal to all other articles together, pappose seta medially and 2 plumose setae laterally; ischium 0.1 times basis length, unarmed; merus 0.2 times basis length, with plumose seta laterally; carpus 2.5 times merus length, with 1 simple and 2 pappose setae medially, plumose seta laterally, medial margin produced as teeth; propodus 0.5 times carpus length, with 2 simple and 1 pappose setae medially, 2 simple setae laterally; dactylus 0.5 times propodus length,with 2 simple setae terminally, lateral margin with hyaline fringe ( Figure 3 H).

Maxilliped 3 basis equal to all other articles together, with 2 pappose setae medially and plumose seta laterally; ischium 0.1 times basis length, with pappose seta; merus 2.8 times ischium length, with pappose seta medially, plumose seta laterally; carpus 1.1 times merus length, with 2 simple and 4 pappose setae, plumose seta laterally, medial margin produced as teeth with hyaline fringe; propodus 0.7 times carpus length, with 1 simple and 2 pappose setae medially, 2 simple setae laterally; dactylus 0.4 times propodus length, with 3 simple setae terminally; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 4 A).

Pereopod 1 basis 0.8 times length of all other articles together, with 2 pappose setae medially, 2 plumose setae laterally, medial margin serrate; ischium 0.1 times basis length, unarmed; merus 2.3 times ischium length, with simple seta; carpus 1.7 times merus length, with 3 simple setae; propodus 0.6 times carpus length, with 4 simple setae; dactylus 0.4 times propodus length, with 4 simple setae terminally; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 4 B).

Pereopod 2 basis 1.1 times length of all other articles together, with pappose seta medially, 3 simple setae laterally, medial margin serrate, lateral margin with hyaline fringe; ischium 0.06 times basis length, with pappose seta; merus 4 times ischium length, with pappose seta; carpus 1.2 times merus length, with 4 simple setae; propodus 0.5 times carpus length, with simple seta; dactylus 2.4 times propodus length, with 3 microserrate setae with single subterminal setule terminally; exopod shorter than basis, flagellum with plumo–annulate setae ( Figure 4 C).

Pereopod 3 basis 1.6 times length of all other articles together, unarmed; ischium 0.08 times basis length, unarmed; merus 1.5 times ischium length, unarmed; carpus 2.2 times merus length, with 2 simple setae; propodus 0.5 times carpus length, with annulate seta; dactylus 0.6 times propodus length, with simple seta terminally; exopod rudimentary, 0.2 basis length, uniarticulate, with simple seta ( Figure 4 D).

Pereopod 4 basis 1.2 times length of all other articles together, with 4 simple setae; ischium 0.09 times basis length, with simple seta; merus 1.8 times ischium length, with simple seta; carpus 1.9 times merus length, with 2 simple setae; propodus 0.7 times carpus length, with annulate seta; dactylus 0.3 times propodus length, with 2 simple setae terminally ( Figure 4 E).

Pereopod 5 basis 0.7 times length of all other articles together, with simple seta; ischium 0.2 times basis length, with simple seta; merus 1.0 times ischium length, with simple seta; carpus 2.6 times merus length, with 3 simple setae; propodus 0.4 times carpus length, with 1 simple and 1 annulate setae; dactylus 0.5 times propodus length, with 2 simple setae terminally ( Figure 4 F).

Uropod peduncles 2.1 times pleonite 6 length, medial margins weakly serrate. Uropod endopod uniarticulate, 0.7 times peduncle length, with 1–2 microserrate setae medially, 4 simple setae laterally, medial margin serrate, terminal seta simple with single subterminal setule. Uropod exopod of 2 articles, equal to length of endopod; article 1 0.3 times length of article 2, with 0–1 simple setae; article 2 with 2–3 simple setae, terminal seta simple with single subterminal setule ( Figure 4 G).

Etymology. The species is named sculpta for the strong sculpturing of the carapace.

Remarks. The species is easily differentiated from the other species in New Zealand, Apocuma chathamensis , by the much more strongly sculptured carapace. The most similar species in the genus is A. poorei Petrescu 2004 , known from Australian waters. However, in A. sculpta the uropod peduncles are more than twice the length of pleonite 6, and the pereopods have few strong serrations. In comparison, in A. poorei the uropod peduncles are less than twice the length of pleonite 6, and the pereopods and uropods are strongly serrated on all or most of the article margins.

Figures

FIGURE 3. Apocuma sculpta n. sp. Holotype ovigerous female, NIWA 45994. A, side view Paratype ovigerous female, NIWA 459998. B, dorsal view; C, antennule; D, mandibles; E, maxillules; F, maxilla; G, maxilliped 1; H, maxilliped 2.

FIGURE 4. Apocuma sculpta n. sp. Paratype ovigerous female, NIWA 459998. A, maxilliped 3; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, pleonite 6 and uropods.