Atlantapseudes nigrichela Bacescu 1978
- Dataset
- The Apseudomorpha (Crustacea: Tanaidacea) of the Gulf of Cadiz and Horseshoe Continental Rise (NE Atlantic): A taxonomic review with new records, species, and ecological data
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Tanaidacea
- family
- Apseudidae
- genus
- Atlantapseudes
- species
- Atlantapseudes nigrichela
description
Gulf of Cadiz — Carbonate and coral mounds. Pen Duick Escarpment: St. 64 PE 237 _ 05 B, 535 m, 1 neuter; St. 64 PE 237 _ 10, 538 m, 2 neuters; St. 64 PE 237 _ 13 A, 546 m, 3 neuters; St. 64 PE 237 _ 14, 546 m, 1 ♂; St. 64 PE 237 _ 16 A, 660 m, 1 neuter; St. 64 PE 237 _ 16 B, 665 m, 1 neuter; St. 64 PE 237 _ 30 B, 550 m, 3 specimens; St. 64 PE 237 _ 31, 559 m, 3 neuters (DBUA 0002001.01 – 08); St. TTR 16 _ AT 600, 610 m, 4 neuters; St. TTR 16 _ AT 602, 556 m, 1 ♂, 2 neuters (DBUA 0002000.04 – 05); St. 64 PE 253 _ 21, 560 m, 2 ♂♂, 4 neuters; St. 64 PE 253 _ 28, 642 m, 1 ♂, 1 neuter; St. 64 PE 253 _ 39, 560 m, 1 ♂; St. 64 PE 253 _ 42, 637 m, 1 neuter; St. 64 PE 253 _ 44 A, 3 specimens; St. 64 PE 253 _ 51, 624 m, 1 neuter; St. 64 PE 253 _ 52, 622 m, 2 neuters; St. 64 PE 253 _ 53, 651 m, 6 neuters; St. 64 PE 253 _ 56, 622 m, 2 neuters; St. 64 PE 253 _ 57, 598 m, 1 neuter; St. 64 PE 253 _ 58, 606 m, 9 specimens; St. 64 PE 253 _ 59, 637 m, 9 neuters (DBUA 0001997.09 – 20). Mound B: St. 64 PE 268 _ 11 A, 489 m, 4 neuters; St. 64 PE 268 _ 13 A, 475 m, 1 specimen; St. 64 PE 268 _ 23, 498 m, 2 ♂♂, 3 neuters; St. 64 PE 268 _ 25, 490 m, 12 specimens (DBUA 0001998.02 – 05). Mound C: St. 64 PE 268 _ 45, ca. 800 m, 1 neuter; St. 64 PE 268 _ 46, ca. 720 m, 1 neuter; St. 64 PE 268 _ 51, ca. 740 m, 1 neuter (DBUA 0001998.06 – 08). Mound D: St. 64 PE 268 _ 40, 473 m, 1 ♀; St. 64 PE 268 _ 42, 451 m, 2 ♀♀, 3 neuters (DBUA 0001998.09 – 10). Mound M: St. MSM 01 - 3 _ 321, 732 m, 1 ♀, 5 neuters (DBUA 0001999.04). Gulf of Cadiz — Off mound and reference samples. El Arraiche area: St. 64 PE 237 _ 19 A, 547 m, 2 neuters (DBUA 0002001.09); St. 64 PE 237 _ 23, 559 m, 3 neuters (DBUA 0002001.10); St. 64 PE 253 _ 17, 612 m, 3 neuters; St. 64 PE 253 _ 33, 542 m, 2 ♀♀, 4 neuters; St. 64 PE 253 _ 34, 542 m, 1 neuter; St. 64 PE 253 _ 36, 542 m, 1 specimen (DBUA 0001997.21 – 24); St. 64 PE 268 _ 09, 428 m, 1 neuter (DBUA 0001998.11). Carbonate Province: St. 64 PE 253 _ 19, 908 m, 1 neuter (DBUA 0001997.25); St. 64 PE 268 _ 05, 581 m, 1 neuter; St. 64 PE 268 _ 54, 750 m, 1 neuter; St. 64 PE 268 _ 55, ca. 700 m, 1 neuter (DBUA 0001998.12 – 14).
discussion
Remarks. This species was described by Băcescu (1978) from off north of Portugal, and redescribed by Błażewicz-Paszkowycz et al. (2011), using material from the GoC. In the original description, Băcescu (op. cit.) illustrated the rostrum of three specimens, which remarkably differed in the shape of the rostrum: while one female specimen (Băcescu 1978, fig. 1 A) is illustrated with rounded shoulders (in accordance with the abovementioned redescription), the others are tridentate (Băcescu 1978, fig. 1 B, C). This suggest that there was more than one species in his collection (see species described below), and therefore the tridentate rostrum should not be considered a character of Atlantapseudes nigrichela. The material examined herein is in full accordance with the redescription (Błażewicz-Paszkowycz et al. 2011), including the shape of the rostrum. After a close examination of the material attributed to A. nigrichela from the collections of GANMNH, we determined that two specimens previously designated as “ paratypes ” by Băcescu (1978) were in fact specimens of an undescribed species that also occurs in the Gulf of Cadiz and is described below.
distribution
Distribution and Ecology. Băcescu (1978) found the species in muddy bottoms between 740 and 1250 m depth, at the slope off northern Portugal. In the GoC (see also Błażewicz-Paszkowycz et al. 2011), A. nigrichela is distributed in the Moroccan slope, at the El Arraiche field and Carbonate province, including the PDE, and at the Deep Field at maximum depth of 1379 m. It was found in the craters of active mud volcanoes (i. e., Meknès, Gingsburg, Yuma and Captain Arutyunov). In Kidd MV, it occurred in quantitative samples from the crater, flank, and near the volcano. It was also found in coral mounds, in silt / clay sediments with coral debris. When vertical stratification was investigated, specimens of A. nigrichela were identified from the top layer to a maximum of 5 – 10 cm.
materials_examined
Additional material: Holotype, ♀ (GANMNH 393 / 30686), 0 9.1972, west Portugal, 41 ° 17 ’ 4 ’’ N, 09 ° 15 ’ 7 ’’ W, 900 m depth. Allotype, ♂; (GANMH 394 / 30687), same data as holotype; 1 ♀, 3 neuters, (GANMNH TAN- 079 / 49217), cruise Thalassa, 0 1.09.1972, W Portugal, 40 ° 33 ’ 05 ’’ N, 09 ° 24 ’ W, 740 m depth. Other records in the GoC. See Błażewicz-Paszkowycz et al. (2011).
materials_examined
Material examined. Gulf of Cadiz — Mud volcanoes. Gemini MV: St. 64 PE 253 _ 08, 444 m, 2 neuters; St. 64 PE 253 _ 10, 432 m, 1 ovigerous ♀; St. 64 PE 253 _ 11, 438 m, 3 specimens; St. 64 PE 253 _ 13, 516 m, 7 neuters; St. 64 PE 253 _ 14, 575, 3 neuters; St. 64 PE 253 _ 15, 600 m, 2 neuters (DBUA 0001997.01 – 06); St. 64 PE 268 _ 19, 430 m. Lazarillo de Tormes MV: St. 64 PE 253 _ 38 A, 494 m, 2 neuters; St. 64 PE 253 _ 38 C, 497 m, 2 neuters (DBUA 0001997.07 – 08). Meknès MV: St. MSM 01 – 3 _ 319, 695 m, 2 ♂♂, 3 neuters (DBUA 0001999.01). Yuma MV: St. TTR 16 _ AT 604, 1030 m, 1 ♀, 5 neuters; St. TTR 16 _ AT 605, 975 m, 7 neuters (DBUA 0002000.02). Ginsburg MV: St. TTR 16 _ AT 607, 983 m, 1 ♂, 1 neuter (DBUA 0002000.03). Captain Arutyunov MV: St. MSM 01 – 3 _ 180, 1323 m, 12 neuters; St. MSM 01 – 3 _ 194, 1379 m, 1 neuter (DBUA 0001999.02 – 03).