Chauliopleona amdrupii ( Hansen 1913 ),

Bird, Graham John, 2015, Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the ‘ Atlantic Margin’, Journal of Natural History 49 (25), pp. 1507-1547: 1515-1519

publication ID

http://doi.org/ 10.1080/00222933.2015.1005715

publication LSID

lsid:zoobank.org:pub:DF4A4007-4DB8-4215-B53B-D95727217166

persistent identifier

http://treatment.plazi.org/id/03BEFC45-4D66-CF26-FE24-FC64FBC498D8

treatment provided by

Carolina

scientific name

Chauliopleona amdrupii ( Hansen 1913 )
status

 

Chauliopleona amdrupii ( Hansen 1913) 

( Figures 2–4View Figure 2View Figure 3View Figure 4, 18View Figure 18)

Leptognathia Amdrupii Hansen, 1913: 81–82  , pl. VIII figs. 2a– c

Leptognathia amdrupi: Nierstrasz 1913: 30  ; Stephensen 1932: 347; Stephensen 1937: 23; Stephensen 1943: 36, 63; Just 1970: 24; else, see Sieg 1983

Chauliopleona amdrupii: Guerrero-Kommritz 2005: 1184–1187  , figs 3–4; else, see Anderson 2013

Diagnosis

Cephalothorax 1.4 times longer than broad (ltb). Pereonites 1–6 all shorter than broad, with parallel lateral margins. Pleon shorter than cephalothorax, without posteriodorsal protuberances; pleonites 1–4 sternite with low recurved subrectangular process. Antennule article-1 (1.25 times) longer than rest of antennule. Maxilliped bases with short distal seta. Cheliped merus without inferior protuberance; carpus relatively slender, twice as long as broad, inferior shield shallow (aspect ratio ≈ 0.2), subtriangular, distal margin not angular; fixed finger with four teeth; dactylus superior margin smooth. Pereopods 1–3 basis with marginal setules; carpus and propodus inferior spinules fine to moderate; pereopods 2–3 carpus with distomedial seta. Pereopods 4–6 ischium with two short setae. Uropod exopod just over half the length of endopod segment-1; endopod slender,> three times longer than peduncle.

Material examined

One non-ov. ♀, BIOICE Stn 2257; one non-ov. ♀, BIOICE Stn 2697; one non-ov. ♀, BIOICE Stn 2701; two non-ov. ♀♀, BIOICE Stn 2849; five non-ov. ♀♀, three prep. ♂♂, BIOICE Stn 2853; eight non-ov. ♀♀, three prep. ♂♂, BIOICE Stn 3280; four non-ov. ♀♀ (one dissected on microslide), BIOICE Stn 3282; three non-ov. ♀♀, BIOICE Stn 3518; one non-ov. ♀, BIOICE Stn 3528; two non-ov. ♀♀ BIOICE Stn 3531; three non-ov. ♀♀, one prep. ♂, BIOICE Stn 3532  .

Size

Non-ovigerous female. Body length 2.44–3.64 mm, cf. 2.7 mm, Hansen (1913), and 3.2 mm, Guerrero-Kommritz (2005). Preparatory male: body length 2.96–3.16 mm.

Distribution records from the AFEN, BIOICE and BIOFAR area

Eleven records from the BIOICE survey: three from the Irminger Basin 1042–1209 m, eight from the Iceland Basin, 988–1840 m. All have positive bottom temperatures of 2.4–4.2°C, with various sediment types including ‘clay’, ‘silty sand’, and ‘shell-sand’  .

Distribution elsewhere

Originally described from Forsblad Fjord, East Greenland, 73–165 m ( Hansen 1913); other records are from Jörgen Brönlund Fjord, East Greenland, 160–180 m ( Just 1970), and the Greenland Sea, 188–191 m ( Guerrero-Kommritz 2005).

Remarks

This species of Chauliopleona  is characterised by a relatively slender cheliped carpus that has a low-aspect ratio (shallow) sub-rectangular shield ( Figure 3HView Figure 3) and a slightly recurved sternal process on pleonites 1–4 ( Figure 2CView Figure 2). The basal setae of the maxilliped ( Figure 3GView Figure 3) are also relatively short compared to those in C. armata  and C. hastata  . There is some discrepancy between the present specimens and the specimen illustrated by Guerrero-Kommritz (2005) in the size of the inferior propodal spinules on pereopods 1–3: his material, one specimen from the Greenland Sea, has robust spinules (also on the carpus), whereas the current material has both weak and moderate setules ( Figure 4A– CView Figure 4). This better corresponds to Hansen’ s description of ‘second pair of legs [pereopod-1] without spinules on the posterior margin of sixth joint [propodus]’ ( Hansen 1913, p. 81). The presence of a distomedial seta on the carpus of pereopods 2–3 is another possible distinguishing character from C. armata  and C. hastata  .

This species is partly sympatric with C. armata  and C. hastata  in the Irminger Basin and its depth and geographic distributions indicate polar emergence.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Tanaidacea

Family

Akanthophoreidae

Genus

Chauliopleona

Loc

Chauliopleona amdrupii ( Hansen 1913 )

Bird, Graham John 2015
2015
Loc

Leptognathia Amdrupii Hansen, 1913: 81–82

Hansen HJ 1913: 82
Loc

Leptognathia amdrupi:

Just J 1970: 24
Stephensen K 1943: 36
Stephensen K 1937: 23
Stephensen K 1932: 347
Nierstrasz HF 1913: 30
Loc

Chauliopleona amdrupii: Guerrero-Kommritz 2005: 1184–1187

Guerrero-Kommritz J 2005: 1187