Diastylis neozealanica Thomson, 1892

Gerken, Sarah, 2015, New Zealand Diastylidae and Gynodiastylidae (Crustacea: Cumacea), Zootaxa 4031 (1), pp. 1-77 : 38

Diastylis neozealanica Thomson, 1892

Diastylis neo-zealanica Thomson, 1892: 268, pl. 18, Figs. 1–11 .— Calman, 1908: 239. Diastylis neoseelandiae . — Zimmer, 1908: 190.

Diastylopsis neozealanica . — Stebbing, 1913: 110.

Diastylis novae-seelandiae. — Zimmer, 1913: 478.

Diastylis neozealanica . — Calman, 1917: 146, 152–153.— Jones, 1963: 202 –209, Figs.Figs. 202–209. Diastylis neozealanicus . — Day, 1980: 265.

Material examined. None.

Diagnosis. Female and subadult male. Carapace elongate, with multiple concentric oblique lateral ridges; ventral margin smooth; antennal notch present. Eyelobe without lenses. Pseudorostrum acute, 0.15 times carapace length anterior of eyelobe. Antennule unknown. Maxilliped 3 ischium not produced. Pereopod 1 basis ischium merus together longer than carpus propodus dactylus together, carpus equal to propodus, propodus longer than dactylus. Pereopod 2 carpus 3 times propodus length. Pereopods 3–4 with rudimentary exopods in female. Telson with 7–9 lateral setae, more than 0.5 times length of uropod peduncles.

Adult male. Carapace similar to female, but with fewer ridges (3); antennal notch more pronounced. Eyelobe with lenses. Telson and uropods longer than in female.

Remarks. This species is most similar to the species of Diastylopsis that share the concentric lateral ridges on the carapace, D. thilenuisi , D. aspratilis n. sp., and D. bicarina . However, the multiple ridges, ridges on the posterior half of the carapace and the lack of spines on the carapace serve to distinguish this species. In D. thilenuisi there are only ridges on the anterior half the carapace, while in Diastylis neozealanica the ridges are on the entire carapace. In Diastylis neozealanica , even in the adult male, there are at least three concentric ridges, while in Diastylopsis aspratilis and D. bicarina there are only two concentric ridges.

Figures

FIGURE 1. Colurostylis whitireia n. sp. holotype ovigerous female (NIWA 094659). A, side view. Paratype subadult female (NIWA 094661). B, side view. Paratype adult male (NIWA 094662) C, side view; D, dorsal view.

FIGURE 2. Colurostylis whitireia n. sp. paratype subadult female (NIWA 094661). A, antennule; B, antenna; C, mandibles; D, maxillule; E, maxilla; F, maxilliped 1; G, maxilliped 2; H, maxilliped 3; I, pereopod 1; J, pereopod 2.

FIGURE 3. Colurostylis whitireia n. sp. paratype subadult female (NIWA 094661). A, pereopod 3; B, pereopod 4; C, pereopod 5; D, pleonite 6, telson and uropods.

FIGURE 4. Colurostylis whitireia n. sp. paratype adult male (NIWA 094662). A, antennule; B, antennule flagellae; C, antenna peduncle; D, antenna; E, maxilliped 3; F, pereopod 1.

FIGURE 5. Colurostylis whitireia n. sp. paratype adult male (NIWA 094662). A, pereopod 2; B, pereopod 3; C, pereopod 4; D, pereopod 5; E, pleopod 1; F, pleopod 2; G, pleonite 6, telson and uropods.

FIGURE 6. Diastylis acanthoelachys n. sp. holotype ovigerous female (NIWA 093174). A, side view. Paratype preparatory female (NIWA 093201). B, side view; C, antennule; D, mandibles; E, maxillule; F, maxilla; G, maxilliped 1; H, maxilliped 2; I, maxilliped 3.

FIGURE 7. Diastylis acanthoelachys n. sp. paratype preparatory female (NIWA 093201). A, pereopod 1; B, pereopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, pleonite 6, telson and uropods.

FIGURE 8. Diastylis adaioacanthus n. sp. holotype subadult female (NIWA 093195). A, side view. Paratype subadult female (NIWA 093182). B, dorsal view; C, antennule; D, mandible; E, maxilla; F, maxilliped 1; G, maxilliped 2.

FIGURE 9. Diastylis adaioacanthus n. sp. paratype subadult female (NIWA 093182). A, maxilliped 3; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, pleonite 6, telson and uropods.

FIGURE 11. Diastylis curtain n. sp. paratype subadult female (NIWA 093192). A, pereopod 1; B, pereopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, pleonite 6, telson and uropods.