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 Family AKANTHOPHOREIDAE Sieg, 1986 Remarks Although the continuous discovery of tanaidacean species worldwide during the last 30 years ( Błażewicz-Paszkowycz, Bamber, Anderson 2012 ) showed that the ‘ Akanthophoreus ’ habitus was a particular bauplan consistent with a family-level Table 1. List of samples in which Chauliopleona and Saurotipleona species were recorded (excluding stations reported in Bird 2004a , 2004b , 2010 , 2014 ).

Survey	Sample	Gear	Date	Locality	Depth	Latitude	Longitude	Mean B.	Temp.	Sediment	Taxon
[m]	[°N]	[°W]	Temp °C	°C
AFEN 1996	53715#1	Mega	25 July 1996	Faroe-Shetland	1095	61.08	3.27	Fine sand	4
Channel
AFEN 1996	53716#1	Mega	25 July 1996	Faroe-Shetland	1100	61.06	3.33	Very fine sand	4
Channel
AFEN 1996	53815#4/5	DG	25 July 1996	West Shetland	180	61.43	0.82	Medium sand	3
Shelf
AFEN 1996	53816#4	DG	25 July 1996	West Shetland	235	61.49	1.12	Fine sand	3
Slope
AFEN 1996	53832#1	Mega	5 August 1996	Faroe-Shetland	1388	61.46	2.60	Very fine sand	4
Channel
AFEN 1996	53835#1	Mega	5 August 1996	Faroe-Shetland	1517	61.63	2.87	Medium sand	4
Channel
AFEN 1996	53885#2	DG	5 August 1996	West Shetland	120	60.63	2.55	3
Shelf
AFEN 1996	53919#2/3	DG	5 August 1996	West Shetland	168	61.28	1.11	Medium sand	3
Shelf
AFEN 1998	54516#1/2	M10	25 May 1998	Faroe-Shetland	1601	61.90	2.31	Sandy mud	4
Channel
AFEN 1998	54523#1/2	M10	25 May 1998	Faroe-Shetland	1363	61.86	1.70	Muddy sand	4
Channel
AFEN 1998	54524#2	M10	25 May 1998	Faroe-Shetland	1393	61.77	1.81	Muddy sand	4
Channel

( Continued ) Table 1. (Continued).

Survey	Sample	Gear	Date	Locality	Depth	Latitude	Longitude	Mean B.	Temp.	Sediment	Taxon
[m]	[°N]	[°W]	Temp °C	°C
AFEN 1998	54525#1/2	M10	25 May 1998	Faroe-Shetland	1386	61.70	1.90	Sandy mud	4
Channel
AFEN 1998	54526#1/3	M10	25 May 1998	Faroe-Shetland	1529	61.85	2.05	Sandy mud	4
Channel
AFEN 1998	54612#2	M6	5 June 1998	Hebrides Slope	398	58.76	7.84	Slightly	3
gravelly
sand
AFEN 1998	54615#1	5 June 1998	Hebrides Slope	991	58.84	7.99	5
AFEN 1998	54621#7/9	DG	5 June 1998	Hebrides Slope	301	59.08	7.35	Gravelly sand	3
BIOICE	2027	RP	23 July 1991	Iceland Plateau	1646	67.12	13.21	0	−0.8	4
BIOICE	2102	Sn	6 July 1992	Denmark Strait	1146	68.00	19.44	0	−0.6	Mud (black)	4
BIOICE	2257	RP	5 September 1992	Irminger Basin	1209	63.24	26.49	3	4.1	Clay,	1
shell-sand
BIOICE	2647	Sn	13 July 1994	Iceland Plateau	1300	68.08	15.32	0	−0.7	Silt	4
BIOICE	2648	RP	14 July 1994	Iceland Plateau	1306	68.08	15.31	0	−0.7	Silt	4
BIOICE	2773	RP	3 August 1995	Iceland Plateau	1629	69.25	14.28	0	−0.9	4
BIOICE	2776	DS	3 August 1995	Iceland Plateau	1555	68.61	14.67	0	Gravelly	4
sandy silt
BIOICE	2810	Sn	23 August 1995	Iceland Basin	1695	62.66	19.75	4	3.3	Silt	2
[Slope]
BIOICE	2863	RP	30 August 1995	Iceland Basin	2400	61.17	18.04	4	2.1	Sand, shell	2
debris
BIOICE	3071	RP	12 July 1997	Iceland Basin	2068	62.18	15.19	4	3.2	2

( Continued ) Table 1. (Continued). BIOICE 3219 RP 11 July 2001 Norwegian Basin 1639 67.15 8.28 1 −0.8 4 BIOICE 3222 RP 11 July 2001 Jan Mayen Ridge 1529 67.54 8.06 1 −0.8 4 BIOICE 3225 RP 12 July 2001 Norwegian Basin 1994 68.35 8.15 0 −0.9 4 DTI 2000 55278#1 MC 4 August 2000 Faroe-Shetland 1277 61.56 2.08 4 Channel DTI 2000 55296#1 MC 8 August 2000 Faroe-Shetland 1265 61.57 1.01 4 Channel DTI 2000 55316#1-3 MC 12 August 2000 Faroe-Shetland 1530 61.70 3.07 4 Channel DTI 2000 55317#1,2 MC 13 August 2000 Faroe-Shetland 1652 61.91 2.81 4 Channel DTI 2000 55445#1,2 MC 1 September 2000 Faroe-Shetland 1058 61.19 2.78 4 Channel DTI 2000 55447#10 MC 2 September 2000 Faroe-Shetland 1656 61.92 2.80 4 Channel DTI 2000 55447#13 MC 2 September 2000 Faroe-Shetland 1656 61.92 2.80 4 Channel INCAL CP01 CP 16 July 1976 North Rockall 2040 57.93 10.92 2 Trough SEA4 57018#2 DG 1 July 2002 West Shetland 198 61.58 0.08°E 193 μm [mean 3 Shelf grain size] SEA4 57020#1 DG 1 July 2002 North Shetland 193 61.57 0.53 189 μm 3 Shelf SEA4 57023#1 DG 1 July 2002 West Shetland 243 61.87 0.03°E 169 μm 3 Slope SEA4 57030#1 BC 1 July 2002 Faroe-Shetland 1588 62.73 1.12 16 μm 4 Channel SEA4 57031#1,2 BC 1 July 2002 Faroe-Shetland 1593 62.76 1.07 12 μm 4 Channel SEA4 57032#1 BC 1 July 2002 Faroe-Shetland 1598 62.85 1.00 11 μm 4 Channel SEA4 57036#1 BC 1 July 2002 Norwegian Basin 2064 63.44 0.42 14 μm 4 ( Continued ) Table 1. (Continued).

Survey	Sample	Gear	Date	Locality	Depth	Latitude	Longitude	Mean B.	Temp.	Sediment	Taxon
[m]	[°N]	[°W]	Temp °C	°C
SEA4	57068#1	BC	1 July 2002	Faroe-Shetland	1741	62.75	1.87	4
Channel
SEA4	57075#1	SBC	1 July 2002	North Shetland	400	61.97	0.23	255 μm	4
Slope
SEA4	57082#1	DG	1 July 2002	West Shetland	200	61.61	0.15	226 μm	3
Slope
SEA4	57100#2	DG	1 July 2002	North Shetland	158	61.24	0.06	110 μm	3
Shelf
SMBA	ES218	ES	3 August 1982	North Rockall	2175	57.37	10.40	2
Trough
SMBA	SBC166	SBC	12 August 1979	North Rockall	2274	57.12	10.33	2
Trough
SMBA	SBC216	SBC	3 August 1982	North Rockall	2200	57.32	10.38	2
Trough

Note: Taxon key: 1, Chauliopleona amdrupii ; 2, C. armata ; 3, C. bamberi ; 4, C. hastata ; 5, Saurotipleona julii . Gear key: AT, Agassiz Trawl; BC, box-corer; DG, Day grab; DS, detritus sledge; ES and RP, epibenthic sled; Sn, Sneli sledge (= detritus sledge); Mega, MC, M, multi-corer; SBC, spade-box corer. Decimal latitude and longitude values are rounded to two decimal points, latter °W unless stated otherwise, ‘Temp.’ to one. Figure 1. Chauliopleona . Sketch drawings: (A) measurement of cheliped carpal shield aspect ratio l/b; C. armata , non-ovigerous female, co-type, Ingolf Stn 22; (B) habitus; (C) pleonite-5 spur; (D) cheliped, distal; (E) cheliped, fixed finger; (F) pereopod-1, distal; (G) uropod. C. hastata , non-ovigerous female co-type, Ingolf Stn 125: (H) habitus; (J) pleonite-5 spur, pleotelson, and uropod; (K) cheliped, distal; (L) pereopod-1, distal; C. hastata one of two cotypes, Ingolf Stn 102: (M) pleonite-5 spur. Not to scale. status, Sieg’ s subfamily Akanthophoreinae was elevated to the Akanthophoreidae only recently (Błażewicz-Paszkowycz and Bamber 2011 ). A phylogenetic analysis confirming the monophyly of most of the previously assigned genera and new family members has been carried out recently (Larsen and Araújo-Silva 2014). Within a fairly conservative overall morphology, specialised characters such as high pleonal spurs, lateral pleotelson spurs, crenation or nodules on various regions of the cheliped, extension of a cheliped carpal shield, slender uropods with one or two-segmented exopods, and grooved and serrate dactylus of pereopods 4–6 are part of the morphological expression within this taxon. The following two genera are typical akanthophoreids, from their overall habitus to the narrow mandibular molars that carry a palmate array of distal spines. The latter character is quite different from that expressed in akanthophoreid-like taxa such as Portaratrum and Leptognathioides where the molar is broader and has a coronal spine array ( Bird 2014 ).