Chauliopleona armata (Hansen 1913)
- Dataset
- Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the ‘ Atlantic Margin’
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Tanaidacea
- family
- Akanthophoreidae
- genus
- Chauliopleona
- species
- Chauliopleona armata
description
(Figures 1 B – G, 5 – 7, 18)
diagnosis
Diagnosis Cephalothorax 1.3 – 1.6 times ltb. Pereonites all shorter than broad; with parallel lateral margins. Pleon shorter than cephalothorax, without posteriodorsal protuberance; pleonites 1 – 4 sternite with subtriangular sternal process. Antennule article- 1 (1.2 times) longer than rest of antennule. Maxilliped basis with long seta. Cheliped merus without inferior protuberance; carpus fairly stout, 1.6 times ltb, inferior shield shallow (aspect ratio ≈ 0.3), rounded, distal margin not angular; fixed finger with four teeth; dactylus superior margin smooth. Pereopods 1 – 3 basis margins smooth; propodus inferior spinules numerous, moderate or robust. Pereopods 2 – 3 carpus without distomedial seta. 1 Pereopods 4 – 6 ischium with two short setae. Uropod exopod about half as long as endopod segment- 1; endopod> three times longer than peduncle.
discussion
Remarks A significant problem in assessing any new records of C. armata is that the original type material consists of only two specimens (Figure 1 B – G) and this shows some differences from the specimens illustrated here that have a slightly shorter cephalothorax and somewhat weaker propodal spinules on pereopods 1 – 3 (Figure 7 A – C). If these new records are genuine, Chauliopleona armata appears to be a eurybathic species, inhabiting both bathyal (200 – 2000 m) and abyssal zones (2000 – 6000 m). However, it is almost certain that the records of C. armata outside of the Atlantic Margin study area (see above) refer to more than one species, and the material needs re-examination.
distribution
Distribution records from the AFEN, BIOICE and BIOFAR area Eleven from AFEN: two from North Feni Ridge, 1600 – 2000 m, eight from the northern Rockall Trough, 1859 – 1871 m, and one from the Hebrides Slope, 1800 m. Ten records from BIOICE: all from the Iceland Basin, 1333 – 2400 m; with positive bottom temperatures 2.1 – 3.99 ° C and a variety of sediment types including ‘ silty sand’, ‘ shell debris’, ‘ silt’ and ‘ muddy gravel’. Distribution elsewhere The type locality is the Davis Strait, 2702 m, and southwest of Cape Farewell, 3474 m (Hansen 1913). I have 51 records from the northeast Atlantic, extending from the Iceland Basin (deeper and further south than the BIOICE area) to the southern Bay of Biscay, including the South Feni Ridge, Rockall Trough, Porcupine Seabight, Celtic and Armorican Slopes, and Biscay Abyssal Plain, 1180 – 4823 m (SMBA, IOS, COB, Chain- 106). Some of these were reported by Holdich and Bird (1985). These data are available from the author on request.
materials_examined
Material examined BIOICE stns. One non-ov. ♀, 2810; 21 non-ov. ♀♀ (one dissected on microslide), 18 prep. ♂♂, 2856; one non-ov. ♀, one prep. ♂, 2859; six non-ov. ♀♀, one ov. ♀, two prep. ♂♂, 2860; one non-ov. ♀, one prep. ♂, 2863; one prep. ♂, 3067; one prep. ♂, 3071; one non-ov. ♀, 3504; one non-ov. ♀, 3515. AFEN Stn. One individual, 54591 # 1; one non-ov. ♀, 54600 # 2. Co-type. Non-ov. ♀, Ingolf Stn 22. Other material. SMBA stns: one individual (ind.), ES 105; four ind., ES 218; two ind., SBC 61; two ind., one ind., SBC 68; SBC 166; one ind., SBC 216. INCAL stns: one ind., CP 01; two ind., CP 02; one ind., DS 01. Size Non-ovigerous female. Body length 2.28 – 3.64 mm, cf. 3.6 mm as measured by Hansen (1913) or 3.8 mm by Guerrero-Kommritz (2005). Ovigerous female: body length 2.96 mm. Preparatory male. Body length 2.72 – 3.44 mm, cf. 3.3 mm Hansen (1913).
Name
- Synonyms
- Leptognathia armata Hansen 1913
- Homonyms
- Chauliopleona armata (Hansen 1913)