Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the ‘ Atlantic Margin’ Author Bird, Graham John text Journal of Natural History 2015 2015-02-28 49 25 1507 1547 journal article 21134 10.1080/00222933.2015.1005715 68d7cf72-3a99-4b8d-a9e5-244aed4e3b9e 1464-5262 3999694 Chauliopleona armata ( Hansen 1913 ) ( Figures 1B–G , 5–7 , 18 ) Leptognathia armata Hansen, 1913: 80–81 , pl. VIII figs. 1a–f Figure 5. Chauliopleona armata . Non-ovigerous female, BIOICE Stn 2856: (A) habitus; (B) pleonal sternites, lateral; (C) antennule; (D) antenna; (E) uropod. Scale bars: (i) 1 mm for A; (ii) 0.5 mm for B; (iii) 0.25 mm for C–E. Figure 6. Chauliopleona armata . Non-ovigerous female, BIOICE Stn 2856: (A) labrum; (B) left mandible molar; (C) right mandible; (D) maxillule endite; (E) maxilliped (palps omitted); (F) maxilliped palp article-2; (G) epignath; (H) cheliped; (J) cheliped propodus mesial comb and dactylus. Scale bars: (i) 0.25 mm for A–G; (ii) 0.25 mm for H–J. Figure 7. Chauliopleona armata . Non-ovigerous female, BIOICE Stn 2856: (A–F) pereopods 1–6 respectively; (G) pleopod (setae very finely plumose, omitted for clarity). Scale bar 0.25 mm. Leptognathia armata : Nierstrasz 1913: 30 ; Stephensen 1932: 347 ; Stephensen 1943: 36 , 63; Holdich and Bird 1985: 443 table 1; else, see Sieg 1983 Chauliopleona armata : Guerrero-Kommritz 2005: 1188–1191 , figs. 5–6; else, see Anderson 2013 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. 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.), ES105; four ind., ES218; two ind., SBC61; two ind., one ind., SBC68; SBC166; one ind., SBC216. INCAL stns: one ind., CP01; two ind., CP02; one ind., DS01. 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) . 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 . Remarks A significant problem in assessing any new records of C. armata is that the original type material consists of only two specimens ( Figure 1B–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 7A–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.