The Isopods of Abyssal Depths in the Atlantic Ocean

More documents

Recommendations

Info

90 ROBERT J. MRNZIES 10. Head subcircular, mandibles small and not extending to margin of frons . . . serrata Richardson (709 meters, Albatross, N. Atlantic, south of Martha's Vineyard) 10. Head quadrate, mandibles normal tuberculata Richardson (1132 meters, Albatross, 37° 22'.30" N., 137° 47' E., off Japan) 11. Peraeopods strongly spinous, head small (much narrower than peraeon) . . stygia (G. O. Sars) (535-2391 meters, N. Atlantic) 11. Peraeopods weakly spinous, head large (nearly as wide as peraeon) 12 12. Somite 4 of peraeon with a sulcus on dorsal suface at midline caeca Richardson (2638 meters, N. Atlantic) 12. Somite 4 of peraeon without a sulcus on dorsal surface at midline 13 13. Lateral border of head strongly convex. Lateral margin of peraeon convex . . bicolor Hansen (1537 meters, N. Atlantic) 13. Lateral border of head scarcely convex, borders of peraeon subparallel albescens Hansen (842-1018 meters, N. Atlantic) Genus: GNATHIA Leach Gnathia vemae, new species Figure 2 Figure 2. Gnathia vemae, n. sp. A: male holotype; B: mandible and frons; C: pleotelson and uropod; D: pylopod; E: frons of praniza; F: first antenna, male. Synonyms: None. Diagnosis: Gnathia with a produced and entire frons, eyes lacking. Mandible with a pronounced redan and three teeth. Pylopod with three articles, last article minute. Flagellum of first antenna with five articles, second also with five articles. Last two large peraeonal somites with a dorsal medial sulcus. Peraeopods not markedly spinous. Pleopoda lacking setae. Measurements: Holotype male length 2.8 mm.. width pleotelson 0.2 mm. Type locality: South Atlantic, L.G.O. Biotrawl No. 55, type plus two male paratypes and one praniza. cat. no. 1-41. Distribution: Known only from the type locality. Affinities: This species is closely allied to Gnathia caeca Richardson, from which it differs in having teeth on the mandible; otherwise the two are very similar. Gnathia caeca Richardson Figure 3 A-B Synonyms: Gnathia caeca Richardson, 1911, pp. 519-520; Stephensen, 1915, p. 7; Monod, 1926a, pp. 406-408. Diagnosis: Pylopods with three articles. Head as wide as thorax. Eyes lacking. Frons produced but not as far as mandible apex. Supraocular lobes strongly tuberculate. Peraeopods without many stout spines. Fourth peraeonal somite with a pronounced dorso-medial sulcus. Margins of uropods and telson entire, without teeth. Measurements: Length 5 mm. (Monod, op. cit., p. 407). Type locality: North Atlantic, Talisman Station 76, latitude 25° 1' N., longitude 19° 15' W., 2638 meters (Monod, op. cit., p. 408). Distribution: Known only from type locality. Affinities: The species appears to be most nearly related to G. bicolor Hansen in key characteristics at least [vide Monod, op. cit., p. 332). Gnathia stygia (G. O. Sars) Figure 3 C-E Synonyms: Anceus stygius G. O. Sars, 1877, p. 348; — 1885, pp. 85-92; — 1886, pp. 27, 85. Gnathia stygius (G. O. Sars), Stebbing, 1893, p. 338; —Ohlin, 1901, p. 22, Fig. 3. Caecognathia stygia (G. O. Sars), Dollfus, 1901, p. 244. Caecognathia sarsi A. Dollfus, 1901, pp. 244-245, Fig. 3. Bathygnathia stygia (err. typ.), Stephensen, 1915, p. 6. Caecognathia stygia (G. O. Sars), Stephensen, 1915, p. 7. Gnathia Stygia (G. O. Sars), Hansen. 1916, pp. 230-232; Monod, 1926a, pp. 398-405. Diagnosis: Pylopods with three articles. Head narrower than thorax. Eyes lacking. Frons produced
ABYSSAL ATLANTIC ISOPODS Figure 3. A-B: Gnathia caeca Richardson. A: male; B: pylopod (after Monod, 1926a, p. 406, Fig. 162). C-E: Gnathia stygia (G. O. Sars). C: pleotelson; D: fifth peraeopod; E: male (after Monod, 1926a, pp. 400-401, Figs. 159-160). F-H: Gnathia albescenoides, n. sp. F: male holotype; G: pylopod; H: first antenna. but not as far as the mandible apex. Supraocular lobes ramose. Peraeopods with many stout spines. Fourth peraeonal somite with a pronounced dorsomedial sulcus. Margin of uropods and telson dentate. Pleopoda elongate and smooth. Entire body provided with sharp tubercles. Flagellum of first antenna with five articles. That of second antenna with seven articles. Measurements: Length to 11 mm. (Monod, op. cit., p. 402). Type locality; North Atlantic, latitude 65° 53' N., longitude 7° 18' W., 2127 meters. Distribution: Arctic Ocean (Gurjanova) to Norwegian Basin of North Atlantic, 552-2465 meters 'Hansen, op. cit). Taken by the Ingolf from the following stations: North of the Faeroes: Station 141, latitude 63° 22' N., longitude 6° 58' W., 1279 meters, temperature —0.6°, six specimens (five male); Station 139. East of Iceland: Station 105, latitude 65° 34' N., longitude 7° 31' W., 1435 meters, temperature —0.8°, one specimen (male). Station 103, latitude 66° 23' N., longitude 8° 52' W., 1090 meters, temperature —0.6°, one specimen (male); Station 102, latitude 66° 23' N., longitude 10° 26' W., 1412 meters, temperature —0.9°, five specimens (one male). North of Iceland: Station 126, latitude 67° 19' N., longitude 15° 52' W., 552 meters, temperature —0.5°, one specimen (larva); Station 124, latitude 67°40'N., longitude 15° 40' W., 932 meters, temperature —0.6°, one and one-half specimens (male). North east of Iceland: Station 120, latitude 67°29'N., longitude 11° 32' W., 1666 meters, temperature — 1.0°, two specimens (male); Station 119, latitude 67° 53' N., longitude 10° 19' W., 1902 meters, temperature — 1.0°, one specimen (larva). South of Jan Mayen: Station 117, latitude69° 13' N., longitude 8° 23'W., 1889 meters, temperature —1.0. 91
Page 1 and 2: SUMMARY 83 INTRODUCTION 84 Material
Page 3: Family: Munnidae 172 A Key to the G
Page 6 and 7: In this paper the marine isopods of
Page 8 and 9: 86 ROBERT J. MENZIES Hansen (1897)
Page 10 and 11: 88 ROBERT J. MENZIES 90. Eurycope g
Page 14 and 15: 92 two specimens (both larvae, one
Page 16 and 17: 94 ROBERT J. MENZIES A KEY TO THE F
Page 18 and 19: 96 ROBERT J. MENZIES 18. Medial pro
Page 20 and 21: 98 ROBERT J. MENZIES Affinities: Th
Page 22 and 23: 100 ROBERT J. MENZIES Figure 8. Hap
Page 24 and 25: 102 ROBERT J. MENZIES Figure 10. A-
Page 28 and 29: 106 ROBERT J. MENZIES and peraeonal
Page 30 and 31: ROBERT J. MENZIES Figure 14. A-B: A
Page 34 and 35: 112 ROBERT J. MENZIES 6. Posterior
Page 42 and 43: 120 ROBERT J. MENZIES Measurements:
Page 44 and 45: 122 ROBERT J. MENZIES 1. Pleon with
Page 46 and 47: 124 ROBERT J. MENZIES Figure 23. St
Page 48 and 49: 126 ROBERT J. MENZIES Diagnosis: St
Page 50 and 51: 128 ROBERT J. MENZIES seen specimen
Page 52 and 53: 130 Macrostylis setifer, new specie
Page 56 and 57: 134 ROBERT J. MENZIES Figure 30. Na
Page 60 and 61: 138 ROBERT J. MENZIES Nannoniscus l
Page 62 and 63:
140 ROBERT J. MENZIES Figure 33. A-
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
146 ROBERT J. MENZIES 2. Dorsum of
Page 70 and 71:
148 below these spines the lateral
Page 72 and 73:
150 ROBERT J. MENZIES Figure 39. St
Page 74 and 75:
Figure 41. A-E: C: uropod; D: male.
Page 76 and 77:
154 ROBERT J. MENZIES Figure 43. Ac
Page 78 and 79:
156 LIST OF ILYARACHNA SPECIES Spec
Page 80 and 81:
158 ROBERT J. MENZIES Figure 46. Il
Page 82 and 83:
160 ROBERT J. MENZIES or lateral. U
Page 84 and 85:
162 ROBERT J. MENZrES Measurements:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
168 ROBERT J. MENZIES Genus: IANIRE
Page 92 and 93:
Page 94 and 95:
172 ROBERT J. MENZIES Rhacura pulch
Page 96 and 97:
174 ROBERT J. MENZIES ramus small,
Page 98 and 99:
176 ROBERT J. MENZIES Figure 59. No
Page 100 and 101:
ROBERT J. MENZIES Figure 60. Acanth
Page 102 and 103:
180 ROBERT J. MENZIES Figure 61. A:
Page 104 and 105:
Page 106 and 107:
184 ROBERT J. MENZIES Genus: THAMBE
Page 108 and 109:
186 ROBERT J. MENZIES The three sub
Page 110 and 111:
188 Uropodal rami blunt, endopod on
Page 112 and 113:
190 ROBERT J. MENZIES Figure 69. Gl
Page 114 and 115:
192 ROBERT J. MENZIES Measurements:
Page 116 and 117:
194 ROBERT J. MENZIES possible. Thi
Page 118 and 119:
LIST OF ATLANTIC ABYSSAL BIOLOGICAL
Page 120 and 121:
198 ROBERT J. MENZIES Haploniscus (
Page 122 and 123:
200 ROBERT J. MENZIES Eurycope (Ind
Page 124 and 125:
LIST OF OTHER ABYSSAL ATLANTIC AND
Page 126 and 127:
204 ROBERT J. MENZIES Haplomesus qu
Page 128:
206 ROBERT J. MENZIES Crustacea Iso
show all

The Isopods of Abyssal Depths in the Atlantic Ocean

Create successful ePaper yourself

Delete template?

Save as template?