Leptostylis zealandiensis, Gerken, Sarah, 2015

Gerken, Sarah, 2015, New Zealand Diastylidae and Gynodiastylidae (Crustacea: Cumacea), Zootaxa 4031 (1), pp. 1-77: 59-65

publication ID

http://dx.doi.org/10.11646/zootaxa.4031.1.1

publication LSID

lsid:zoobank.org:pub:19E72EB1-B55C-40C0-AD11-23BA6E97D438

persistent identifier

http://treatment.plazi.org/id/C70EEC59-6E1F-FF82-FF24-1FFBFA9B7871

treatment provided by

Plazi

scientific name

Leptostylis zealandiensis
status

n. sp.

Leptostylis zealandiensis  n. sp.

( Figs. 33–36View FIGURE 33View FIGURE 34View FIGURE 35View FIGURE 36)

Material examined. Holotype: ovigerous female, NIWA 0 93173, TAN0705/ 41, 43.8363 °S, 176.7092 °E – 43.8330 °S, 176.7127 °E, 478–479 m, 5 April 2007. Paratypes: ovigerous female (dissected), NIWA 0 94706, TAN0705/ 285, 43.7967 °S, 175.3158 °E – 43.8045 °S, 175.3148 °E, 418–422 m, 27 April 2007; adult male (dissected), NIWA 0 93184, TAN0707/ 29, 38.6177 °S, 168.9428 °E – 38.6258 °S, 168.9490 °E, 480–482 m, 29 May 2007; adult male, NIWA 0 93203, TAN0705/ 41, 43.8363 °S, 176.7092 °E – 43.8330 °S, 176.7127 °E, 478–479 m, 5 April 2007. Non-type material: 50 specimens, NIWA 0 46225, TAN0705/ 136, 43.2903 °S, 175.5522 °W – 43.2933 °S, 175.5630 °W, 638 –644, 15 April 2007; 43 specimens, NIWA 0 46226, TAN0705/ 160, 42.7820 °S, 176.7152 °W – 42.7817 °S, 176.7042 °W, 1023–1026 m, 16 April 2007; 25 specimens, NIWA 0 46227, TAN0705/ 251, 42.9958 °S, 178.9957 °E – 42.9910 °S, 179.0052 °E, 520–530 m, 24 April 2007; 40 specimens, NIWA 0 46228, TAN0705/ 160, 42.7820 °S, 176.7152 °W – 42.7817 °S, 176.7042 °W, 1023–1026 m, 16 April 2007; 16 specimens, NIWA 0 46229, TAN0707/ 119, 40.8800°S, 170.8555 °E – 40.8883 °S, 170.8565 °E, 529–534 m, 6 June 2007; 7 specimens, NIWA 0 46234, TAN0705/ 251, 42.9958 °S, 178.9957 °E – 42.9910 °S, 179.0052 °E, 520–530 m, 24 April 2007; 8 specimens, NIWA 0 95007, TAN0705/ 285, 43.7967 °S, 175.3158 °E – 43.8045 °S, 175.3148 °E, 418–422 m, 27 April 2007; 1 specimen, NIWA 0 95008, TAN0705/ 141; 6 specimens, NIWA 0 95009, TAN0705/ 49, 44.4862 °S, 177.1413 °E – 44.4841 °S, 177.1416 °E, 1235–1239 m, 6 April 2007; 12 specimens, NIWA 0 95010, TAN0705/ 83, 43.9790 °S, 179.6298 °E – 43.9850 °S, 179.6218 °E, 529–530 m, 9 April 2007; 1 specimen, NIWA 0 95011, TAN0707/ 105, 40.1277 °S, 170.2140 °E – 40.1352 °S, 170.2090 °E, 803–805 m, 5 June 2007; 15 specimens, NIWA 0 95012, TAN0705/ 276, 42.6213 °S, 175.9225 °E – 42.6203 °S, 175.9335 °E, 1194–1199 m, 26 April 2007; 3 specimens, NIWA 0 95013, TAN0705/ 127, 43.0650 °S, 174.9325 °W – 43.0732 °S, 174.9348 °W, 933–940 m, 13 April 2007; 4 specimens, NIWA 0 95014, TAN0705/ 41, 43.8363 °S, 176.7092 °E – 43.8330 °S, 176.7127 °E, 478–479 m, 5 April 2007; 10 specimens, NIWA 0 95015, TAN0705/ 49, 44.4862 °S, 177.1413 °E – 44.4841 °S, 177.1416 °E, 1235–1239 m, 6 April 2007; 6 specimens, NIWA 0 95016, TAN0705/ 276, 42.6213 °S, 175.9225 °E – 42.6203 °S, 175.9335 °E, 1194–1199 m, 26 April 2007; 5 specimens, NIWA 0 95017, TAN0705/ 65, 44.0162 °S, 178.5210 °E – 44.0143 °S, 178.5175 °E, 769–771 m, 7 April 2007; 2 specimens, NIWA 0 95018, TAN0705/ 178, 43.5212 °S, 178.6203 °W – 43.5228 °S, 178.6315 °W, 424–425 m, 18 April 2007; 5 specimens, NIWA 0 95019, TAN0705/ 251, 42.9958 °S, 178.9957 °E – 42.9910 °S, 179.0052 °E, 520–530 m, 24 April 2007; 1 specimen, NIWA 0 95020, TAN0707/ 29, 38.6177 °S, 168.9428 °E – 38.6258 °S, 168.9490 °E, 480–482 m, 29 May 2007; 2 specimens, NIWA 0 95021, TAN0707/ 29, 38.6177 °S, 168.9428 °E – 38.6258 °S, 168.9490 °E, 480–482 m, 29 May 2007; 2 specimens, NIWA 0 95022, TAN0705/ 21, 44.1262 °S, 178.8445 °E – 44.1262 °S, 178.8445 °E, 516 m, 4 April 2007; 20 specimens, NIWA 0 95023, TAN0705/ 78, 43.9771 °S, 179.6300°E – 43.9771 °S, 179.6300°E, 529 m, 9 April 2007; 3 specimens, NIWA 0 95024, TAN0705/ 65, 44.0162 °S, 178.5210 °E – 44.0143 °S, 178.5175 °E, 769–771 m, 7 April 2007; 10 specimens, NIWA 0 95025, TAN0707/ 29, 38.6177 °S, 168.9428 °E – 38.6258 °S, 168.9490 °E, 480–482 m, 29 May 2007; 1 specimen, NIWA 0 95026, TAN0705/ 24, 44.1208 °S, 174.8432 °E – 44.1242 °S, 174.8448 °E, 512– 513 m, 4 April 2007; 12 specimens, NIWA 0 95027, TAN0705/ 49, 44.4862 °S, 177.1413 °E – 44.4841 °S, 177.1416 °E, 1235–1239 m, 6 April 2007; 1 specimen, NIWA 0 95028, TAN0705/ 127, 43.0650 °S, 174.9325 °W – 43.0732 °S, 174.9348 °W, 933–940 m, 13 April 2007.

Diagnosis. Female and subadult male. Carapace globular, unornamented. Eyelobe without lenses. Pleonite 6 subequal or slightly longer than telson  . Pereopod 1 propodus much longer than basis.

Adult male. Carapace with serrate ridge on pseudorostral lobe, originating near suture and ending at the level of the eyelobe. Eyelobe narrow, without lenses. Antennule expanded, but not greatly expanded. Antenna extending past posterior border of pleonite 3.

Etymology. The species is named zealandiensis  for the area of collection, the waters of New Zealand, both east and west of the islands.

Description. Ovigerous female holotype 5.0 mm, ovigerous female paratype 4.5 mm. Body ( Figs. 33View FIGURE 33 A –B). Carapace antennal notch present. Pleon no more than 1.5 times length of carapace and pereonites together.

Antennule ( Fig. 34View FIGURE 34 A) article 1 longest, with plumose seta and simple seta; article 2 with simple seta; article 3 shortest, with few simple setae. Main flagellum of 3 articles, 2 slender aesthetascs and small simple seta terminally; accessory flagellum of 2 articles, more than half length of main flagellum article 1, with few simple setae terminally.

Antenna not examined.

Mandibles ( Fig. 34View FIGURE 34 B) navicular, lacinia mobilis with 3 cusps, with row of 9 microserrate medially, right molar with strong teeth.

Maxillule ( Fig. 34View FIGURE 34 C) with 2 endites; palp with 2 microserrate setae.

Maxilla ( Fig. 34View FIGURE 34 D) with 3 endites; broad endite medial row of setae pedunculate; narrow endites short, with microserrate setae.

Maxilliped 1 ( Fig. 34View FIGURE 34 E) dactylus seta short.

Maxilliped 2 ( Fig. 34View FIGURE 34 F) ischium visible.

Maxilliped 3 ( Fig. 34View FIGURE 34 G) 100: 5: 12: 16: 19: 16; basis weakly expanded distolaterally with 3 plumose setae, with pappose setae medially.

Pereopod 1 ( Fig. 35View FIGURE 35 A) 100: 13: 17: 115: 148: 83; very long; all articles with simple setae; dactylus with longer simple setae.

Pereopod 2 ( Fig. 35View FIGURE 35 B) 100: 9: 31: 77: 34: 77; basis with simple and few plumose setae; merus with simple setae; carpus with simple setae, group of stout setae distally; propodus with stout seta distally; dactylus with many simple setae, terminal setae long; exopod longer than basis.

Pereopod 3 ( Fig. 35View FIGURE 35 C) 100: 7: 15: 20: 11: 7; basis, merus with few simple setae; carpus and propodus with annulate setae; dactylus terminal seta long and simple; rudimentary exopod 0.18 times basis length.

Pereopod 4 ( Fig. 35View FIGURE 35 D) 100: 7: 20: 24: 15: 7; basis, ischium, merus with many simple setae; carpus and propodus with annulate setae; dactylus terminal seta long and simple; rudimentary exopod 0.17 times basis length.

Pereopod 5 ( Fig. 35View FIGURE 35 E) 100: 16: 42: 58: 21: 11; basis, ischium, merus with simple setae; carpus and propodus with annulate setae; dactylus terminal seta long and simple.

Telson  ( Fig. 35View FIGURE 35 F) 0.9 time pleonite 6 length; with 2 setae with single setule laterally, terminal seta stout and blunt.

Uropods ( Fig. 35View FIGURE 35 F) peduncles with several setae with single setule medially; endopod triarticulate, article 1 longer than articles 2–3 together, with few setae with single setule medially, terminal seta long and simple; exopod shorter than endopod, with several simple setae, terminal seta long and simple.

Adult male paratypes 5.9 mm, 6.5 mm.

Body ( Figs. 33View FIGURE 33 C –D). Carapace with serrate ridge on pseudorostral lobes parallel to suture, ending parallel to anterior end of eyelobe. Pleon no more than 1.5 times length of carapace and pereonites together; pleonites 3–4 with stout ventral setae.

Antennule ( Fig. 36View FIGURE 36 A) stout, peduncle articles broad; article 1 longest, with plumose seta and simple seta; article 3 very short. Main flagellum of 6 articles, article 1 broad but not as wide as peduncle, with many simple setae that extend only to end of flagellum, articles 3–4 with short simple setae; accessory flagellum of 3 articles, article 2 with simple setae.

Antenna ( Figs. 36View FIGURE 36 B –C) peduncle article 2 with pappose setae, articles 3–4 unarmed, article 5 with many ranks of short setae; flagellum extending at least to posterior border of pleonite 4.

Mandibles –maxilliped 2 not examined.

Maxilliped 3 ( Fig. 36View FIGURE 36 D) 100: 5: 7: 14: 12: 14; basis weakly expanded distolaterally, with 3 short plumose setae, with pappose setae medially.

Pereopod 1 not examined, broken.

Pereopod 2 ( Fig. 36View FIGURE 36 E) 100: 7: 17: 62: 17: 50; all articles with many short setae; dactylus terminal seta simple, moderate in length.

Pereopod 3 ( Fig. 36View FIGURE 36 F) 100: 7: 17: 17: 7: 7; basis with short simple setae on margin; ischium and merus with simple setae; carpus and propodus with annulate setae; dactylus terminal seta shorter than subterminal seta.

Pereopod 4 ( Fig. 36View FIGURE 36 G) 100: 8: 19: 19: 8: 8; basis with simple seta; merus with simple setae; carpus and propodus with annulate setae; dactylus terminal seta shorter than subterminal seta.

Pereopod 5 ( Fig. 36View FIGURE 36 H) basis with simple setae and plumose seta; ischium and merus with simple setae; carpus and propodus with annulate setae; dactylus terminal seta shorter than subterminal seta.

Pleopod 1 ( Fig. 36View FIGURE 36 I) basal article slender, rami small, with plumose setae.

Pleopod 2 ( Fig. 36View FIGURE 36 J) shorter than pleopod 1, basal article without setae, rami with plumose setae.

Telson  ( Fig. 36View FIGURE 36 K) 0.9 times pleonite 6 length, dorsally produced, with 1 seta with single setule laterally, terminal setae simple and blunt.

Uropods ( Fig. 36View FIGURE 36 K) peduncles with many setae with single setule medially; endopod triarticulate, with many setae with single setule medially, terminal seta with single setule; exopod shorter than endopod, with setae with single setule, terminal seta with single setule.

Distribution. Chatham Rise, Challenger Plateau, New Zealand, 196–1239 m.

Remarks. Males of Leptostylis zealandiensis  can be distinguished from males of L. wisniewskiae  by the carapace, eyelobe and antennal length. In L. zealandiensis  , the carapace has a serrate ridge dorsally on the pseudorostral lobe, the eyelobe is narrow and without lenses, and the antennal flagellum extends at least past the posterior border of pleonite 3. In L. wisniewskiae  , the carapace is unornamented, the eyelobe is broad and has lenses, and the antennal flagellum extends just past the posterior border of pleonite 1.

Females of Leptostylis zealandiensis  can be easily distinguished from females of L. wisniewskiae  by size and pereopod 1. In L. zealandiensis  females are 4.5–5 mm, and in pereopod 1 the propodus is much longer than the basis. In L. wisniewskiae  females are 3–3.2 mm, and in pereopod 1 the propodus is shorter than the basis.

NIWA

National Institute of Water and Atmospheric Research