Tanystylum tiara, Staples, 2019
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publication ID |
https://doi.org/ 10.11646/zootaxa.4567.3.1 |
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publication LSID |
lsid:zoobank.org:pub:0AEFAF80-B001-4A18-88AC-5B6A189F6DCD |
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DOI |
https://doi.org/10.5281/zenodo.5944886 |
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persistent identifier |
https://treatment.plazi.org/id/03895C33-291E-4F08-FF01-FF2AFE34FA14 |
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treatment provided by |
Plazi |
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scientific name |
Tanystylum tiara |
| status |
sp. nov. |
Tanystylum tiara View in CoL sp. nov.
Figure 8 View FIGURE 8 A–I; Plate 3 View PLATE 3 A–C
Material examined. Holotype, female ( NHMUK 2018.18 View Materials ), Southwest Indian Ocean, Coral Seamount, 41˚ 22.37'S, 42° 54.60'E, ROV, 745 m, specimen JC066-1068, stn 4.12, parent 736, 16 November 2011. Right palp and right oviger are mounted in Euparal on glass slides.
Description. Female holotype. Trunk ( Fig. 8A, B View FIGURE 8 . Plate 3A, B View PLATE 3 ) discoid, unsegmented, cephalon with thickened anterior rim, prominent dorsolateral processes each coalesced into single flange divided into three spine-tipped peaks, each peak decreasing in size from inner to outer margin ( Fig. 8C View FIGURE 8 . Plate 3C View PLATE 3 ); lateral processes touching, each with a distal anterior and posterior tubercle. Ocular tubercle taller than wide, apical one-third conical, circumscribed with an apparent suture line, lateral papillae about level with top of eyes; four eyes, large, pigmented.
Proboscis cylindrical, longer than trunk, stained black distally, truncate, oral surface recessed, rim irregular, bubbly.
Abdomen with low dorsal bulge at base, unarticulated, enlarged at about two thirds length, tapering distally to pointed tip, several distal spines.
Chelifore scapes separated at bases, each one-segmented, directed upwards, tapering from base towards tip, one very long terminal spine about half length of scape and two lesser spines, chelae absent.
Palp ( Fig. 8G View FIGURE 8 ) seven-segmented, segment 4 longest, almost 30% longer than segment 2, distal three segments with long ventral setae.
Oviger ( Fig. 8I View FIGURE 8 ) nine-segmented, segment 4 longest, segment 9 with two simple terminal spines.
Third leg; ( Fig. 8E View FIGURE 8 ) femur with dorsodistal fringe of setae on low swelling, first tibia with two proximal spinetipped dorsal swellings; propodus gently curved, proximal half with four robust spines, tips blunt, rounded, distal half with field of much shorter, sharp spines; auxiliary claws slightly longer than half length terminal claw, flared outward from bases. Gonopore ventrodistal, coxa 2, all legs.
Measurements of holotype (mm). Trunk length (frontal margin of cephalic segment to tip of 4 th lateral process), 1.520; width across 2 nd lateral processes, 1.120; proboscis length (lateral), 1.840; greatest diameter proboscis, 0.736; abdomen length (lateral), 1.024. Palp: seg. 1, 0.160; seg. 2, 0.272; seg. 3, 0.144; seg. 4, 0.664; seg. 5, 0.160; seg. 6, 0248; seg. 7, 0.224.
Oviger: seg. 1, 0.120; seg. 2, 0.184; seg. 3, 0.184; seg. 4, 0.328; seg. 5, 0.280; seg. 6, 0.112; seg. 7, 0.104; seg. 8, 0.48; seg. 9, 0.80. Third leg: coxa 1, 0.400; coxa 2, 0.440; coxa 3, 0.280; femur, 0.520; tibia 1, 1.680; tibia 2, 2.528; tarsus, 0.120; propodus, 0.800; claw, 0.352; auxiliary claws 0.232.
Etymology. Tiara (Tiara–ornamental headband worn on front of head). Alluding to the ornate tiara-like flanges on the anterolateral margin of the cephalon; a noun in apposition.
Remarks. When viewed under high power the e ntire surface is seen to be covered in bifurcate setae. Tubercles on lateral process are mostly irregular in shape with minute spines on lateral margins ( Fig. 8H View FIGURE 8 ). Whilst some Tanystylum have a thickened anterior rim on the cephalon, this species is unique in possessing a tiara-like flange on the anterolateral margins.
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.