Tanytarsus crocota, Gilka, Zakrzewska & Krzeminski, 2016
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publication ID |
https://doi.org/ 10.26879/621 |
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publication LSID |
lsid:zoobank.org:pub:BAA44C0D-C497-4CED-85D7-B74A2A2AAEB4 |
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persistent identifier |
https://treatment.plazi.org/id/59790D07-F92D-320E-F166-04BD1070F948 |
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treatment provided by |
Felipe |
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scientific name |
Tanytarsus crocota |
| status |
sp. nov. |
Tanytarsus crocota View in CoL
Giłka, Zakrzewska and Krzemiński sp. nov.
Figures 4 View FIGURE 4 , 5 View FIGURE 5
zoobank.org/ D7DF1DCB-7E39-440A-918F-0F7911E8F767
Type material. Holotype. Adult male (entire thorax dorsally, head and legs partially hidden in a milky cloud, poorly observable) preserved in 11 x 5.5 x 3 mm piece of amber ( Eocene , ~40-45 Ma, Gulf of Gdańsk; CCHH 1754-7 ; Figure 4.1 View FIGURE 4 ).
Derivation of the name. From the Latin (golden yellow or saffron-coloured dress), with reference to the appearance of the inclusion; noun in apposition.
Diagnosis. Tibial spur of fore leg strong. Anal point slender, long, reaching far beyond apices of superior volsellae, spinulae not observed, crests long and narrow. Superior volsella finger-like, distinctly curved at mid length, apically rounded and medially directed. Digitus not observed. Median volsella sickle-shaped. Inferior volsella short, with prominent setal tubercles on apex.
Description. Adult male (n = 1).
Total length ca. 2.3 mm; wing length ca. 1250 μm.
Head ( Figure 4.2 View FIGURE 4 ). Eyes bare. Antenna with 13 well discernible flagellomeres, AR 0.85. Length of palpomeres 3-5 (μm): 55, 110, 150.
Wing ( Figure 4.3, 4.4 View FIGURE 4 ). Ellipse-shaped, with anal lobe weak, broadest at 2/3 length, width: 365 μm, length/width ratio 3.42. FCu placed distinctly distally of RM; VRCu 1.24. Veins ending as follows (from base to tip): Sc (fading near RM), An, Cu 1, R 1, R 2+3, M 3+4, R 4+5, M 1+2. Wing chaetotaxy unobservable.
Legs. Tibia of fore leg with single, strong, ca. 25 μm long spur ( Figure 4.5 View FIGURE 4 ). Tibial combs of mid and hind legs separated, teeth up to 20 μm long; each comb with spur, up to 30 μm long (mid leg) and 40 μm long (hind leg). Sensilla chaetica on ta 1 of p 2 not observed. Lengths of leg segments and leg ratios in Table 5.
Hypopygium ( Figure 5 View FIGURE 5 ). Gonostylus ca. 80 μm long, slightly longer than gonocoxite, straight, apex pointed. Median setae on anal tergite not observed, 2-3 posterolateral setae on each side of anal point. Anal point long, reaching far beyond apices of superior volsellae, slender, narrowed at mid length, spinulae not observed, crests long and narrow. Superior volsella well developed, finger-like, distinctly curved at mid length, apically rounded and medially directed, bearing 3 fine setae on apex. Digitus not observed. Median volsella sickle-shaped, with straight stem and several arcuate slender lamellae ( Figure 5.3, 5.4 View FIGURE 5 ). Inferior volsella short, reaching slightly over base of gonostylus, apical part with prominent setal tubercles bearing strong setae.
Remarks. The generic membership of the new species can be determined from a set of typical characters: the antenna consisting of 13 flagellomeres, the tibial combs of mid and hind legs separated, each bearing a spur, the gonostylus longer than the gonocoxite and the anal point with long crests. However, the exceptionally strong fore leg spur, the curved and finger-like superior volsella and the sickle-shaped median volsella are unique characters in the genus, in both fossil and extant species. Together they form a combination that makes the assignation of T. crocota to any species group open.
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.