Benthic Polychaeta (Annelida) from the continental shelf of the Southern Mexican Pacific

Study Extent

The samples were collected during the oceanographic expedition “Sedimento 4” on board the R/V “El Puma” of the Universidad Nacional Autónoma de México (UNAM), during February 2008. Thirty-eight stations between 42 m and 109 m depth were sampled on soft bottoms along the continental shelf of the Southern Mexican Pacific.

Sampling

The geographic position of stations was determined with the Global Positioning System (GPS) of the vessel and depth with a Konsberg Simrad EM300 multibeam echosounder. The sediment grain size was determined with a Beckman Coulter laser diffraction particle sizing analyzer and classified according the Wentworth scale (Wentworth, 1922). The organic carbon percent was determined by the Walkley and Black (1934) acid digestion method. The temperature (°C) and salinity (psu) data were obtained from the GLOBAL_REANALYSIS_ PHY_001_030 (Fernández and Lellouch, 2018) published by the Copernicus Marine Monitoring Service with a temporary resolution of 24 hours. Reanalysis data for dissolved oxygen (ml/L), nitrate (mmol/m3) and phosphate (mmol/m3) concentrations were obtained from the GLOBAL_REANALYSIS_BIO_001_029 (Perruche, 2018) disseminated by the Copernicus Marine Monitoring Service with a temporary resolution of 24 hours.

Method steps

1. The sediment samples were collected with a Smith McIntyre grab (0.1 m2) and sieved through a 0.5 mm mesh to separate the macrofauna. The biological material was fixed with 10% formalin/seawater solution and preserved in ethanol 70%. The polychaetes were identified to species level, quantified, catalogued and deposited in the Colección Nacional de Anélidos Poliquetos from the Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (CNAP-ICML, UNAM; DFE.IN.061.0598). The validity of the identified species names was verified with recent systematic reviews and with the World Polychaeta Database (Read and Fauchald, 2021).

All benthic Polychaeta were identified to family or species

1. Malmgreniella macginitiei
2. Sigalionidae
3. Sthenelanella uniformis
4. Pilargidae
5. Ancistrosyllis
6. Hermundura bennei
7. Hermundura riojai
8. Hermundura salazarvallejoi
9. Sigambra tentaculata
10. Syllidae
11. Paraehlersia
12. Syllis
13. Nereididae
14. Neanthes
15. Glyceridae
16. Glycera branchiopoda
17. Glycera prosobranchia
18. Goniadidae
19. Goniada acicula Hartman
20. Nephtyidae
21. Aglaophamus verrilli
22. Amphinomidae
23. Linopherus kristiani
24. Dorvilleidae
25. Lumbrineridae
26. Cenogenus eliae
27. Ninoe foliosa Fauchald
28. Scoletoma erecta
29. Scoletoma monroi
30. Scoletoma zonata
31. Oenonidae
32. Arabella iricolor
33. Driloneris longa
34. Onuphidae
35. Diopatra neotridens
36. Diopatra obliqua
37. Diopatra rizhophorae
38. Diopatra splendidissima
39. Diopatra tridentata
40. Diopatra
41. Kinbergonuphis cedroensis
42. Kinbergonuphis microcephala (Hartman, 1944)
43. Kinbergonuphis pulchra
44. Kinbergonuphis vermillionensis
45. Kinbergonuphis vexillaria
46. Mooreonuphis
47. Orbiniidae
48. Leitoscoloplos multipapillatus
49. Leitoscoloplos panamensis
50. Scoloplos
51. Cossuridae
52. Cossura brunnea Fauchald
53. Spionidae
54. Malacoceros indicus
55. Malacoceros
56. Paraprionospio pinnata
57. Prionospio ehlersi Fauvel
58. Prionospio lighti Maciolek
59. Scolelepis cf. squamata
60. Spiophanes kroeyeri
61. Longosomatidae
62. Heterospio
63. Magelonidae
64. Magelona californica
65. Magelona marianae
66. Magelona pacifica
67. Magelona spinifera
68. Magelona tehuanensis
69. Paraonidae
70. Aricidea (Acmira) simplex
71. Aricidea (Aricidea) sp.
72. Aricidea (Acmira) lopezi
73. Cirrophorus branchiatus
74. Levinsenia gracilis
75. Paradoneis
76. Cirratulidae
77. Aphelochaeta multifilis
78. Chaetozone corona
79. Kirkegaardia tesselata
80. Capitellidae
81. Decamastus
82. Mediomastus californiensis
83. Notomastus hemipodus
84. Travisiidae
85. Travisia brevis
86. Sternaspidae
87. Sternaspis maior
88. Ampharetidae
89. Amphicteis glabra
90. Terebellidae
91. Pista
92. Trichobranchidae
93. Terebellides californica
94. Sabellidae
95. Acromegalomma modestum (Quatrefages, 1866)
96. Chone
97. Euchone incolor
98. Panousea
99. Parasabella

Continental shelf of the Southern Mexican Pacific