Laophontodes volkerlehmanskii, George & Lehmanski & Kihara, 2020
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publication ID |
https://dx.doi.org/10.3897/zookeys.997.56965 |
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publication LSID |
lsid:zoobank.org:pub:F7EA809B-D116-4D16-897C-CC3DDDF4DAA1 |
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persistent identifier |
https://treatment.plazi.org/id/34839233-C919-4892-9CA9-8FAFEFCF0D70 |
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taxon LSID |
lsid:zoobank.org:act:34839233-C919-4892-9CA9-8FAFEFCF0D70 |
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treatment provided by |
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scientific name |
Laophontodes volkerlehmanskii |
| status |
sp. nov. |
Laophontodes volkerlehmanskii sp. nov. Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9 , 10 View Figure 10
Locus typicus.
Indian Ocean, Central Indian Ridge, Kairei Field, station #I12_36T, geographic position 25°19.240'S, 70°02.433'E, 2467 m depth.
Type material.
Four females and four males collected during research cruise INDEX 2012 on December 1st, 2012. Holotype: female, not dissected, on one slide, collection number SMF 37216/1; paratype 1 (allotype): male, not dissected, on one slide, collection number SMF 37217/1; paratype 2: female, dissected and mounted onto 15 slides, collection number SMF 37218/1-15; paratype 3: male, dissected and mounted onto two slides, collection number SMF 37219/1-2; paratype 4: male, not dissected, on one slide, collection number SMF 37220/1; paratype 5: male, not dissected, on one slide, collection number SMF 37221/1; paratype 6: female, not dissected, on one slide, collection number SMF 37222/1; paratype 7: female, not dissected, on one slide, collection number SMF 37223/1.
Description.
Female: Habitus (Figs 2A View Figure 2 , 3A, B View Figure 3 ) cylindrical, body length (R to end of FR) (median value) = 399 µm (390-405 µm; N = 3). R small, fused to cphth, with 2 sensilla (one sensillum missing in Fig. 2A View Figure 2 ) and 1 apical tube pore. Cphth reaching more than 25% of total body length, with posterior swelling on each side; dorsally covered by sensilla, those on posterior margin arising from socles. Body somites clearly distinct. Last thoracic and first abdominal somites fused forming the GDS, juncture seen as dorsal serration. Posterior margins of free body somites, excluding telson, serrated dorsally, and with sensilla arising from small socles; P2-P5-bearing somites additionally with 1 dorsal tube pore centrally; P6 and P7-bearing somites carrying 2 dorsal tube pores centrally. Telson (Figs 2A View Figure 2 , 3A, B View Figure 3 , 4A View Figure 4 ) slightly smaller than preceding somite, with FR set widely apart. Anal operculum (Figs 4A View Figure 4 , 5A View Figure 5 ) with distinct, strong apical spinules; basally with pair of sensilla and additional spines above bases of FR.
FR (Figs 4A View Figure 4 , 5A View Figure 5 ) slender, about 4 times as long as wide, with distal tube pore and 7 bare setae: seta II dorsal to, and twice as long as I; III subapical; IV and V apical and fused at base, V very long and narrow, distal 1/3 bipinnate; VI apical on inner margin, bare and short; VII dorsal, tri-articulated.
A1 (Fig. 5B, B View Figure 5 ') 5-segmented. First segment carrying 1 bipinnate seta and 2 rows of spinules on apical edge below seta; second segment with 9 setae (2 setae broken in Fig. 5B View Figure 5 ) and 1 row of spinules each on outer and inner margin; third segment with 7 bare setae and 1 aes (fused to 1 seta) (Fig. 5B View Figure 5 '); fourth segment partly overlapped by preceding one (Fig. 5B View Figure 5 '), with 1 bare seta; fifth segment with 10 bare setae, 2 of which forming an apical trithek with1 aes. Setal formula: 1-1/2-9/3-6+(1+aes)/4-1/5-8+(2+aes).
A2 (Fig. 6A View Figure 6 ). Allobasis without abexopodal seta. Exopod represented by minute bare seta. Endopod with 2 rows of inner spinules - 1 subapical and 1 proximal -; additionally, with 2 bare spines and 1 fine bare seta accompanied by 4 anterior spinules; apically with 5 setae, of which 3 geniculated and 1 biplumose.
Md (Fig. 6B View Figure 6 ) with slender gnathobase bearing 4 teeth; palp 1-segmented, with 5 setae (1 missing, and 1 damaged in Fig. 6B View Figure 6 ), of which 1 biplumose and 1 unipinnate.
Mxl (Fig. 6C, C View Figure 6 '). Praecoxal arthrite (Fig. 6C View Figure 6 ) with 1 row of spinules basally, 8 bare apical spines and 1 subapical biplumose seta, additionally with 2 surface setae; coxa (Fig. 6C View Figure 6 ') with 2 bipinnate apical setae; basis, endopod and exopod fused to single lobe (Fig. 6C View Figure 6 ') carrying 2 unipinnate and 1 bare apical seta, 1 bare subapical seta, 3 bare and 1 bipinnate seta and few outer spinules.
Mx (Fig. 6D, D View Figure 6 '). Syncoxa bearing 3 rows of spinules and 2 endites. Proximal endite with 2 plumose setae and 1 bare seta with cleft tip (arrow in Fig. 6D View Figure 6 '), distal endite with 1 plumose and 2 bare setae. Allobasis distinct, terminally with strong claw accompanied by 1 plumose and 1 fine, bare seta. Endopod 1-segmented, knob-like, with 2 bare setae.
Mxp (Fig. 6E, E View Figure 6 ') prehensile; syncoxa bearing 1 bare seta and single row of spinules apically (Fig. 6E View Figure 6 ); basis with 1 row of spinules on inner and outer margins; endopod drawn out into strong claw basally accompanied by minute, bare seta (Fig. 6E View Figure 6 ').
P1 (Figs 3B View Figure 3 , 7A View Figure 7 ) with slender and bow-like intercoxal sclerite, and large, triangular praecoxa (Fig. 3B View Figure 3 ); coxa and basis with slight longitudinal elongation, outer margin of basis forming pedestal for exopod, with 1 biplumose outer seta carrying STE, and 1 minute anterior inner seta. Endopod 2-segmented, enp-1 strong and elongate, with 2 rows of spinules on inner margin; enp-2 small, approximately 1/3 the length of enp-1, apically with 1 strong claw, 1 long, slender, geniculated seta, and 1 minute seta. Exopod 3-segmented, less than half the length of endopod, each segment with outer spinules, exp-1 carrying 1 biplumose outer seta with STE; 2 with 1 bare geniculated outer seta; exp-3 apically with 4 bare, geniculated setae.
P2-P4 (Fig. 8A-C View Figure 8 ) with transversely elongated bases with outer margin bearing 1 long seta, the latter bipinnate in P2, bare in P3 and P4; exopods 3-segmented, endopods 2-segmented. All exopodal segments with outer row of robust spinules, and fine inner spinules. Exp-1 and exp-2 with 1 bipinnate outer spine; exp-3 with 3 pinnate outer spines, apically with 1 spine, whose inner margin plumose and outer margin pinnate, and 1 slender biplumose seta. Endopods narrow, enp-1 small, without spinules or setae; enp-2 elongate, of P2 and P4 with spinules, P2-P4 with 2 apical setae, both biplumose in P3 and P4, inner apical seta bare in P2. See Table 2 View Table 2 for setal formula.
P5 (Fig. 7B View Figure 7 ) with short setophore on slender baseoendopod carrying 1 long bare seta and a few spinules; endopodal lobe reduced, represented by 2 bipinnate setae. Exopod fused to baseoendopod, slender, with 1 bare outer seta, 1 bare seta displaced to anterior surface, and 3 plumose setae - 1 subapical and 2 apical.
GF (Fig. 7B View Figure 7 ) with single gonopore. P6 strongly reduced, limbs fused into single small plate, with pair of minute bipinnate spines.
Male: The male differs from the female in the following characters: habitus, A1, P3 and P4 endopod, and P5.
Habitus (Figs 2B View Figure 2 , 9 View Figure 9 ) as in female, but slightly longer, body length (from R to FR) (median value) = 402 µm (378-426 µm; N = 2); cphth with more dorsal sensilla than female; with antero-lateral sensilla arising from socles.
A1 (Figs 4B, C View Figure 4 , 10A, A View Figure 10 ') 6-segmented, chirocer; first segment with 1 bipinnate seta and 3 rows of spinules; second segment with 9 bare setae (one seta missing in Fig. 10A View Figure 10 ), and a row of short spinules; third segment with 6 bare setae (one seta missing in Fig. 10A View Figure 10 ), and single row of spinules, segment partially overlapping fourth and fifth segment; fourth segment (Fig. 4C View Figure 4 , * in Fig. 10A View Figure 10 ) minute, almost completely covered by fifth segment, with 1 bare seta; fifth segment (Fig. 10A View Figure 10 ') swollen, with 9 setae (1 biplumose, 8 bare), 2 of which form an acrothek with 1 aes, cuticle thorn-like at upper margin; sixth segment with 10 bare setae (1 seta missing in Fig. 10A View Figure 10 '), 2 of which form an acrothek with 1 small aes. Setal formula: 1-1/2-8/3-6/4-1/5-7+(2+aes)/6-8+(2+aes).
P3 exopod as in female, endopod (Fig. 10B View Figure 10 ) 3-segmented; enp-1 minute and unarmed; enp-2 longest, with rows of spinules on inner and outer margins, lacking setae but inner apical margin with curved apophysis reaching to 2/3 the length of enp-3; enp-3 about 2/3 the length of enp-2, with 2 biplumose apical setae.
P4 exopod as in female, endopod (Fig. 10C View Figure 10 ) 2-segmented; enp-2 with 1 additional flexible outer spine accompanied by few spinules at its base; apically with 2 biplumose setae. The setal formula for P3 and P4 is given in Table 2 View Table 2 .
P5 (Fig. 10D View Figure 10 ) baseoendopod longer than broad, with 1 outer seta arising from short setophore; endopodal lobe incorporated into basal part of baseoendopod and represented by 1 long seta with bipinnate distal half; exopod not fused to baseoendopod, with 1 outer unipinnate seta, and 2 bipinnate setae - 1 subapical and bearing STE, and 1 apical.
Etymology.
The epithet volkerlehmanskii is given in dedication to the 60th birthday of LMA Lehmanski’s father Volker Lehmanski (Gelsenkirchen, Germany).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.