144 ROBERT J. MENZIES Figure 36. A-E: Eurycope acutitelson, n. sp. A: dorsal view male holotype; B second pleopod; C: sixth peraeopod; D: lateral view pleotelson; E: male pleopod. F-H: Eurycope nodosa, n. sp. F: first antenna; G: dorsal view female holotype; H: uropod. I-J: Eurycope ovaloides, n. sp. I: dorsal view gravid female holotype; J: uropod.
Measurements: Holotype male length 3.4 mm., width pleon 1.0 mm., allotype length 3.2 mm., width pleon 0.9 mm. Type locality: South <strong>Atlantic</strong>, L.G.O. Biotrawl No. 52, types plus six male and six female paratypes, cat. no. 1-138. Distribution: Known only from type locality. Aff<strong>in</strong>ities: This species is unique <strong>in</strong> its sharp pleonal antero-lateral borders. Eurycope nodosa, new species Figure 36 F-H Synonyms: None. Diagnosis: Eurycope with broad frontal apex bear<strong>in</strong>g a stout seta on each side and be<strong>in</strong>g around oneseventh <strong>the</strong> width <strong>of</strong> cephalon. Pleon shield-shaped, apex evenly rounded, lack<strong>in</strong>g sp<strong>in</strong>es or <strong>in</strong>cisions. Peraeonal somites 5-6 completely separated. Uropodal exopod about one-half <strong>the</strong> length <strong>of</strong> endopod. Measurements: Female holotype length 4.6 mm., width pleon 1.4 mm. Type locality: South <strong>Atlantic</strong>, L.G.O. Biotrawl No. 53, type and one female paratype, cat. no. 1-137. Distribution: Known only from type locality. Aff<strong>in</strong>ities: This species is allied to gaussi Wolff from <strong>the</strong> Antarctic, from which it differs <strong>in</strong> hav<strong>in</strong>g fewer setae on <strong>the</strong> frontal area. Eurycope ovaloides, new species Figure 36 I-J Synonyms: None. Diagnosis: Eurycope with broad frontal area bear<strong>in</strong>g three sp<strong>in</strong>es on each side and be<strong>in</strong>g around one-half <strong>the</strong> width <strong>of</strong> cephalon. Pleon without sp<strong>in</strong>es or projections, apex rounded. Peraeonal somites 5-6 fused on midl<strong>in</strong>e. Uropodal exopod about one-third <strong>the</strong> length <strong>of</strong> endopod. Measurements: Gravid female holotype length 4.3 mm., width pleon 1.9 mm. Type locality: South <strong>Atlantic</strong>, L.G.O. Biotrawl No. 14, type and one female paratype, cat. no. 1-127. Distribution: Known only from type locality. Aff<strong>in</strong>ities: This species is allied to ovalis Vanh<strong>of</strong>fen, from which it differs <strong>in</strong> hav<strong>in</strong>g only three sp<strong>in</strong>es on ei<strong>the</strong>r side <strong>of</strong> <strong>the</strong> frontal area and <strong>in</strong> hav<strong>in</strong>g <strong>the</strong> frontal marg<strong>in</strong> <strong>of</strong> <strong>the</strong> frontal area nearly straight and not deeply <strong>in</strong>cised. Eurycope species <strong>in</strong>determ<strong>in</strong>able Fragments <strong>of</strong> Eurycope were common and were taken from L.G.O. Biotrawl No. 1, ten fragments; no. 9, one female fragment; no. 12, three fragments; no. 16, several fragments; no. 49, three fragments; no. 51, two fragments <strong>of</strong> two species; no. 52, fourteen ABYSSAL ATLANTIC ISOPODS 145 miscellaneous fragments; no. 53, fifty-two fragments; no. 94, two fragments; no. 101, one fragment; no. 201, four fragments; no. 218, three fragments; no. 231, four fragments; no. 233, one fragment; no. 234, six fragments; no. 237, one female fragment. Genus: STORTHYNGURA Vanh<strong>of</strong>fen Synonyms: Storthyngura Vanh<strong>of</strong>fen, 1914, p. 583; — Hansen, 1916, p. 132; — Wolff, 1956, p. 112. Diagnosis: Eurycopidae with biramous uropoda. Dorsum <strong>of</strong> body provided with sp<strong>in</strong>es. Pleon laterally with sp<strong>in</strong>e-like projections. Front <strong>of</strong> cephalon well def<strong>in</strong>ed. Last three peraeonal somites immovable but usually with <strong>in</strong>dications <strong>of</strong> separation. Coxal plates visible <strong>in</strong> dorsal view on peraeonal somites 2-4 <strong>in</strong>clusive. Pleon separated from peraeon. Type species: Storthyngura elegans Vanh<strong>of</strong>fen, 1914, p. 584, Fig. 114. Unfortunately, Vanh<strong>of</strong>fen (op. cit.) did not select a type, and not all <strong>of</strong> <strong>the</strong> species cited by him actually belong to <strong>the</strong> genus. Composition: Of <strong>the</strong> 13 species cited by Wolff (1956) one does not belong to Storthyngura but belongs <strong>in</strong>stead to Acanthocope—viz., A. atlantica (Beddard). This error was cont<strong>in</strong>ued by Birste<strong>in</strong> (1957). <strong>The</strong> 18 known species are shown <strong>in</strong> <strong>the</strong> accompany<strong>in</strong>g list. Prior to this monograph only two species, S. magnisp<strong>in</strong>a (Richardson) and S. truncata (Richardson), were known from <strong>the</strong> abyss <strong>of</strong> <strong>the</strong> <strong>Atlantic</strong>. Six new species from <strong>the</strong> <strong>Atlantic</strong> abyss are described here<strong>in</strong>. <strong>The</strong> species range <strong>in</strong> depth from 400 to 7000 meters. A LIST OF THE DESCRIBED SPECIES OF STORTHYNGURA Species 1. elegans Vanh<strong>of</strong>fen 2. pulchra Hansen 3. novaezelandiae (Beddard) 4. magnisp<strong>in</strong>is (Richardson) 5. truncata (Richardson) 6. fragilis (Beddard) 7. benti Wolff 8. furcata Wolff 9. caribbea (Benedict) 10. herculea Birste<strong>in</strong> 11. tenuisp<strong>in</strong>is tenuisp<strong>in</strong>is Birste<strong>in</strong> 12. tenuisp<strong>in</strong>is kurilica Birste<strong>in</strong> 13. brachycephala Birste<strong>in</strong> 14. chelata Birste<strong>in</strong> 15. bicornis Birste<strong>in</strong> 16. vitjazi Birste<strong>in</strong> 17. robustissima Monod, Stephensen 1947 18. <strong>in</strong>termedia (Beddard) Depth Range {Meters) Least Greatest 3423 2490 2012 2258 2788 2305 5230 5850 1256 6475 7246 7210 5670 5345 6156 7305 400 A KEY TO THE SPECIES OF STORTHYNGURA 3423 2690 2012 2702 3225 2305 7000 6770 1256 8100 7246 7230 5680 6860 6207 8430 750 5670 5670 1. Pleon with po<strong>in</strong>ted apex 2 1. Pleon with truncated, rounded, or <strong>in</strong>dented apex 9
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