Cumella oculata, Gerken, Sarah, 2009

Gerken, Sarah, 2009, Two new Cumella (Crustacea: Cumacea: Nannastacidae) from the North Pacific, with a key to the North Pacific Cumella, Zootaxa 2149, pp. 50-61 : 51-57

publication ID	https://doi.org/ 10.5281/zenodo.188696
DOI	https://doi.org/10.5281/zenodo.6215167
persistent identifier	https://treatment.plazi.org/id/03C387F7-FFEB-A933-FBB1-F231E54BB926
treatment provided by	Plazi
scientific name	Cumella oculata
status

Treatment

Cumella G.O.Sars 1865 View in CoL

Cumella oculata n. sp.

Material examined. Holotype adult male, USNM 1125353 Knight Island, Prince William Sound, 60°17.950’N, 147°24.510’W, 1 m, 18 May 2003.

Paratype adult male, dissected, USNM 1125354 Knight Island, Prince William Sound, 60°17.950’N, 147°24.510’W, 1 m, 18 May 2003.

Paratype ovigerous female, dissected, USNM 1125355Old Harbor, Kodiak Island, 57°09.401’N, 153°23.321’W, 5 m, 13 June 2003.

Other material: 1 adult male, Port Graham, Kachemak Bay, 59°28.417’N, 151°53.650’W, 1 m, 8 May 2004; 1 adult male, 1 ovigerous female, Old Harbor, Kodiak Island, 57°09.401’N, 153°23.321’W, 10 m, 13 June 2003; 1 damaged subadult female, Woody Island, Kodiak Island, 57°46.242’N, 152°21.555’W, 10 m, 6 June 2004.

Diagnosis. Eye lobe well developed with large lenses in both sexes, dorsal crest without large spines, uropod peduncle with medial setae, pleonite 6 longer than uropod peduncle only in female.

Description. Holotype adult male, USNM 1125353

Adult male, 2.9 mm. Carapace covered with small tubercles, antennal notch weak, anteroventral margin serrated, with tooth at ventral corner, dorsal sharp fold; pseudorostral lobes 0.4 carapace length; eyelobe 0.1 carapace length with large lenses, eyelobe pigmented; carapace longer than thoracic segments together ( Figure 1 View FIGURE 1 A)

Paratype adult male, USNM 1125354

Adult male, 2.5 mm. Dorsal view ( Figure 1 View FIGURE 1 B).

Antennule extending past pseudorostral lobes; peduncle article 1 longest, with fine hairlike setae; article 2 with 2 simple and 1 complex pedunculate setae; article 3 shortest, with simple and complex pedunculate setae; main flagellum of 2 articles, with 2 aesthetasc and 2 simple setae terminally; accessory flagellum minute, of 1 article, with simple setae ( Figure 1 View FIGURE 1 C).

Antenna peduncle of 5 articles, articles 1–3 unarmed, articles 4–5 bearing ranks of slender setae; flagellum of 16 articles, extending to pleonite 5 ( Figure 1 View FIGURE 1 D, 1E).

Maxillule with 2 endites; outer endite with double row of stout setae distally; inner endite with 4 setae; palp with 2 setae ( Figure 1 View FIGURE 1 F).

Maxilla with 3 endites; broad endite distal margin with simple, pappose and microserrate setae, medial margin with row of 12 setae; medial narrow endite with 5 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extend just past distal margin of broad endite ( Figure 1 View FIGURE 1 G).

Maxilliped 1 basis produced distally as blunt lobe, distal margin with several setae, medial margin with 2 hooks, 3 microserrate setae, row of simple setae mid-article; ischium present, unarmed; merus with 2 setae; carpus longer than merus, medial face lined with simple and comb setae; propodus with simple setae distally; dactylus slender, with simple setae terminally ( Figure 1 View FIGURE 1 H).

Maxilliped 2 basis as long as next 4 articles together, with simple and plumose setae; ischium present, small, unarmed; merus equal to carpus length, with 1 plumose seta; carpus with sparsely plumose setae; propodus with distal plumose seta, sparsely plumose setae on medial face; dactylus shorter than propodus, with 2 slender and 1 stout simple setae terminally ( Figure 2 View FIGURE 2 A).

Maxilliped 3 basis longer than all other articles together, medial margin with pappose setae, distal corner with 1 plumose seta; ischium present, unarmed; merus longer than carpus, with 1 plumose seta distally and plumose and simple setae medially; carpus with 1 plumose and 2 pappose setae; propodus with 4 sparsely plumose setae; dactylus 0.5 propodus length, with 1 slender and 1 stout simple setae terminally; exopod shorter than basis, flagellum with plumo-annulate setae ( Figure 2 View FIGURE 2 B).

Pereopod 1 basis subequal to next 4 articles together, margin with simple and plumose setae, tooth at distal corner, medial margin with smaller teeth; ischium subequal to merus, with simple seta; merus with 2 simple setae; carpus twice length of merus, with simple setae; propodus 0.7 carpus length, with simple setae; dactylus 0.5 propodus length, with simple setae; exopod shorter than basis, flagellum with plumo-annulate setae ( Figure 2 View FIGURE 2 C).

Pereopod 2 basis expanded, subequal to all other articles together, with pappose and simple setae; ischium small, unarmed; merus 0.7 carpus length, with simple setae; carpus with simple setae; propodus 0.5 carpus length, with simple seta; dactylus with stout setae with single sub-terminal setule, terminal seta longest; exopod longer than basis, flagellum with plumo-annulate setae ( Figure 2 View FIGURE 2 D).

Pereopod 3 basis expanded, longer than all other articles together, unarmed; ischium with simple setae; merus subequal to carpus, unarmed; carpus with simple setae; propodus subequal to carpus, with simple setae; dactylus with 2 simple setae, terminal seta fused to dactylus; exopod shorter than basis, flagellum with plumoannulate setae ( Figure 2 View FIGURE 2 E).

Pereopod 4 basis expanded, subequal to all other articles together, with simple and plumose setae; ischium unarmed; merus 0.7 carpus length, unarmed; carpus with simple setae; propodus with simple setae; dactylus with 2 simple setae, terminal seta fused to dactylus; exopod longer than basis, flagellum with plumo-annulate setae ( Figure 2 View FIGURE 2 F).

Pereopod 5 basis longer than next 3 articles together, with simple and plumose setae; ischium with simple seta; merus 0.4 carpus length, with simple seta; carpus with simple setae; propodus with simple setae; dactylus with 2 simple setae, terminal seta fused to dactylus ( Figure 3 View FIGURE 3 A).

Uropod peduncles subequal to pleonite 6, with 4 simple setae with single sub-terminal setule medially. Uropod endopod of 1 article, 0.7 peduncle length, with 4 simple setae with single sub-terminal setule medially, 3 simple setae distally, terminal seta 0.7 endopod length, simple with single sub-terminal setule. Uropod exopod of 2 articles, 0.7 length of endopod; article 1 0.3 length of article 2, with simple seta; article 2 with simple seta and terminal seta 1.3 exopod length, simple with single sub-terminal setule ( Figure 3 View FIGURE 3 B).

Paratype ovigerous female, USNM 1125355

Ovigerous female, 2.6 mm. Carapace with fine hairs, antennal notch weak, anteroventral margin toothed; pseudorostral lobes 0.5 carapace length; eyelobe 0.1 carapace length, with large lenses; carapace longer than thoracic segments together ( Figure 4 View FIGURE 4 A).

Antennule peduncle article 1 longest, with simple seta and tooth distally; article 2 unarmed; article 3 shortest, with simple and complex pedunculate setae; main flagellum of 2 articles, with 2 aesthetasc and 3 simple setae terminally; accessory flagellum minute, of 1 article, with simple setae terminally ( Figure 4 View FIGURE 4 B).

Mandible navicular, with 4 microserrate lifting setae ( Figure 4 View FIGURE 4 C).

Maxilliped 3 basis subequal to all other articles together, medial margin with plumose setae, distal corner with 1 large plumose seta and 2 small plumose setae; ischium small, unarmed; merus 0.8 carpus length, with 4 plumose setae; carpus with 5 plumose setae; propodus 1.4 carpus length, with 3 plumose setae; dactylus 0.5 propodus length, with 3 simple setae; exopod shorter than basis, flagellum with plumo-annulate setae ( Figure 4 View FIGURE 4 D).

Pereopod 1 basis subequal to next 3 articles together, with simple and plumose setae; ischium with simple seta; merus 0.3 carpus length, with simple setae; carpus with simple setae; propodus 0.7 carpus length, with simple setae; dactylus 0.6 propodus length, with simple setae, terminal seta microserrate with single subterminal setule; exopod equal to basis, flagellum with plumo-annulate setae ( Figure 4 View FIGURE 4 E).

Pereopod 2 basis 0.8 all other articles together, with simple and plumose setae; ischium unarmed; merus 0.5 carpus length, with simple seta; carpus with simple setae; propodus 0.5 carpus length, unarmed; dactylus 2.0 propodus length, with simple setae with single sub-terminal setule, terminal seta longest; exopod longer than basis, flagellum with plumo-annulate setae ( Figure 4 View FIGURE 4 F).

Pereopod 3 basis longer than all other articles together, with simple setae; ischium with simple seta; merus, carpus and propodus subequal, merus unarmed; carpus with simple setae; propodus with simple setae; dactylus with 2 simple setae, terminal seta fused to dactylus; exopod absent ( Figure 4 View FIGURE 4 G).

Pereopod 4 basis longer than next 3 articles together, with simple setae; ischium unarmed; merus, carpus and propodus subequal, merus with simple seta; carpus with simple setae; propodus with simple setae; dactylus with 2 simple setae, terminal seta fused to dactylus; exopod absent ( Figure 3 View FIGURE 3 C).

Pereopod 5 basis longer than next 3 articles together, with simple setae; ischium with simple seta; merus 0.8 carpus length, with simple seta; carpus with simple seta; propodus subequal to carpus, unarmed; dactylus with 2 simple setae, terminal seta fused to dactylus ( Figure 3 View FIGURE 3 D).

Uropod peduncles 0.5 pleonite 6 length, with 1 simple and 1 simple with single sub-terminal setule setae medially. Uropod endopod of 1 article, equal to peduncle length, with 2 simple with single sub-terminal setule setae medially, terminal seta broken. Uropod exopod of 2 articles, 0.8 length of endopod; article 1 0.5 length of article 2, with simple seta; article 2 with simple seta, terminal seta 0.8 exopod length, simple with single sub-terminal setule ( Figure 3 View FIGURE 3 E).

Etymology. The species is named oculata , in reference to the large eyelobe with conspicuous lenses, present in both sexes although larger in the male.

Remarks. The species that are most similar to Cumella oculata are C. vulgaris , C. bruinensis , and C. alaskensis . Cumella oculata can be distinguished from the other species by the large eye lobe with large lenses in both sexes. Additionally, in the adult male C. oculata the uropod peduncle is equal in length to pleonite 6 and bears 4 setae medially, while in the adult male C. bruinensis the uropod peduncle is much longer than pleonite 6 and bears 2 setae medially. The ovigerous female of C. oculata has no spines on the dorsal crest, while the female C. alaskensis has 5 large spines in the dorsal crest. The female of C. oculata can distinguished from the females of C. bruinensis and C. vulgaris by the proportions and armature of the uropods. In C. oculata the uropod peduncle is 0.5 pleonite 6 length, the peduncle medial margin is smooth, the endopod is equal in length to the peduncle, and the endopod bears 2 setae medially. In comparison, the females of C. bruinensis and C. vulgaris both have the peduncle equal or longer than pleonite 6, the peduncle medial margin is serrate, the endopod is shorter than the peduncle, and the endopod bears 3 setae medially.