The Isopods of Abyssal Depths in the Atlantic Ocean

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130 Macrostylis setifer, new species Figure 27 F-H Synonyms: None. Diagnosis: Cephalon narrower in front than rear, front slightly emarginate. Fourth peraeonal somite narrower than third and fifth, lateral borders rounded. First peraeonal somite slightly longer than second. Uropodal peduncle shorter than width of pleon. Dorsum of pleon lacking pits or sensory organs, ROBERT J. MENZIES lateral borders not constricted, apex produced, convex, with at least 12 plumose setae. Apex of male pleopods simple, rounded, lacking stout spines or lateral projections, apex with 13 setae. First antenna with five articles (male). Measurements: Holotype male length 6.1 mm., width pleon 1.1 mm. Type locality: North Atlantic, L.G.O. Biotrawl No. 234, type only, cat. no. 1-113. Distribution: Known only from type locality. Figure 28. A-D: Macrostylis hirsuticaudts, n. sp. A: dorsal view male holotype; B: first male pleopod; C: third paraeopod; D: first antenna. E-G: Macrostylis caribbicus,n. sp. E: dorsal view male holotype; F: first pleopod; G: first antenna. H-K: Macrostylis vemae, n. sp. H: dorsal view male holotype; I: third paraeopod; J: first pleopod; K: first antenna.
Affinities: The fact that the fourth peraeonal somite is narrower than the third and fifth sets this species apart from M. caribbicus and M. subinermis. Macrostylis hirsuticaudis, new species Figure 28 A-D Synonyms: None. Diagnosis: Cephalon narrower in front than behind, front straight. Peraeonal somite 4 slightly narrower than 3 but as wide as 5, postero-Iateral angles sharp, each with a stout seta. First and second peraeonal somites subequal in length. Uropodal peduncle much longer than length of pleon and twice as wide as pleon. Dorsum of pleon with pits in front of uropods, sensory organs present, apex almost straight bearing at least six plumose setae. Apex of male first pleopods laterally without stout spines, lateral part recurved, apex with eight setae. First antenna with five articles (male). Measurements: Holotype male length 2.7 mm., width pleon 0.5 mm., allotype length 3.2 mm., width pleon 0.6 mm. Type locality: South Atlantic, L.G.O. Biotrawl No. 22, types plus two male and two female paratypes, cat. no 1-197. Distribution: Known only from type locality. Affinities: This species is allied to M. longiremis, Meinert but has uropoda longer than the pleon not shorter. Macrostylis caribbicus, new species Figure 28 E-G Synonyms: None. Diagnosis: Cephalon narrower in front than behind, front slightly convex. Peraeonal somite 4 as wide as 3 and 5, lateral borders rounded. First and second peraeonal somites subequal in length. Uropodal peduncle not as long as width of pleon. Dorsum of pleon without pits or sensory organs, lateral borders constricted in front of uropods; apical margin with 16 plumose setae. Apex of male first pleopods with stout spine laterally and five apical setae. First antenna with six articles (male). Measurements: Male holotype length 4.8 mm., width pleon 0.9 mm. Type locality: North Atlantic, Caribbean, L.G.O. Biotrawl No. 98, type, cat. no. 1-118. Distribution: Known only from type locality. Affinities: This species is close to M. subinermis Hansen except that the postero-Iateral angles of the cephalon are sharp and pointed, not rounded. Synonyms: None. Macrostylis vemae, new species Figure 28 H-K ABYSSAL ATLANTIC ISOPODS 131 Diagnosis: Cephalon narrower in front than behind, front straight. Peraeonal somite 4 as wide as 3 and 5 and with rounded sides. First and second peraeonal somites subequal in length. Uropodal peduncle longer than width of pleon. Dorsum of pleon without dorsal pits or sensory organs; lateral border constricted in front of uropods; apical border convex and produced and lacking plumose setae. Apex of male first pleopods lacking lateral projections or stout spines, each rounded and with eight apical setae. First antenna with five articles. Measurements: Male holotype length 3.9 mm., width pleon 0.6 mm., allotype length 3.8 mm., width pleon 0.7 mm. Type locality: North Atlantic, L.G.O. Biotrawl No. 231, types and two male and two female paratypes, cat. no. 1-110. Distribution: Known also from L.G.O. Biotrawl No. 229, one female, cat. no. 1-116. Affinities: The bulbous swelling of the pleon in front of the uropods distinguishes this from a group of species lacking the swollen lateral border. Macrostylis bifurcatus, new species Figure 29 A-E Synonyms: None. Diagnosis: Cephalon quadrate, front slightly emarginate. Peraeonal somite 4 slightly narrower than 3 but as wide as 5. First and second peraeonal somites subequal in length. Peduncle of uropoda longer than width of pleon. Dorsum of pleon with slight pits above uropods. Apex of male first pleopods without stout lateral spine but with spoon-shaped lateral projections and each with five apical setae. Pleonal lateral margin not constricted in front of uropods. First antenna with five articles (male). Apex of pleon with deep medial incision; plumose setae lacking. Measurements: Holotype male length 2.7 mm., width pleon 0.4 mm. Type locality: South Atlantic, L.G.O. Biotrawl No. 51, type, cat. no. 1-188. Distribution: Known also from L.G.O. Biotrawl No. 52, one male, cat. no. 1-187. Affinities: The bifurcated nature of the apex of the pleon sets this species apart from the others. Macrostylis minutus, new species Figure 29 F-G Synonyms: None. Diagnosis: Cephalon narrower in front than behind, front with three lobes. Peraeonal somite 4 narrower than 5 but not narrower than 3, lateral margins rounded. First peraeonal somite shorter than second. Uropodal peduncle as long as pleon. Dorsum of pleon with slight pits above uropods and
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 12 and 13: 90 ROBERT J. MRNZIES 10. Head subci
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 56 and 57: 134 ROBERT J. MENZIES Figure 30. Na
Page 60 and 61: 138 ROBERT J. MENZIES Nannoniscus l
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 90 and 91: 168 ROBERT J. MENZIES Genus: IANIRE
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
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180 ROBERT J. MENZIES Figure 61. A:
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182 ROBERT J. MENZIES Figure 62. A-
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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:
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194 ROBERT J. MENZIES possible. Thi
Page 118 and 119:
LIST OF ATLANTIC ABYSSAL BIOLOGICAL
Page 120 and 121:
198 ROBERT J. MENZIES Haploniscus (
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200 ROBERT J. MENZIES Eurycope (Ind
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LIST OF OTHER ABYSSAL ATLANTIC AND
Page 126 and 127:
204 ROBERT J. MENZIES Haplomesus qu
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206 ROBERT J. MENZIES Crustacea Iso
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The Isopods of Abyssal Depths in the Atlantic Ocean

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