Dixa calciphila, Moulton, John K., 2016
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publication ID |
https://doi.org/ 10.11646/zootaxa.4121.4.6 |
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publication LSID |
lsid:zoobank.org:pub:F15F9CC4-A5CE-45D9-94F7-7C112AE71544 |
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DOI |
https://doi.org/10.5281/zenodo.6078345 |
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persistent identifier |
https://treatment.plazi.org/id/03F37E07-6F4B-410C-FF40-30B5FC97FD18 |
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treatment provided by |
Plazi |
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scientific name |
Dixa calciphila |
| status |
sp. nov. |
Dixa calciphila View in CoL sp. nov.
( Figs 3–4 View FIGURES 1 – 4 , 10 View FIGURES 9 – 11 , 15–17 View FIGURES 12 – 20 , 23 View FIGURES 21 – 24 )
Type material. HOLOTYPE ♂, labeled: “ USA: TN: MARION COUNTY / Spr @ US 64/TN41 opposite Raccoon Mtn/ N35°03′31″ W85°29′08″, 243 m / 24.iv.2014 / J.K. Moulton”; “ HOLOTYPE / Dixa / calciphila / J.K. Moulton [red label]” ( CNC). PARATYPES: Same data as holotype, 5♂ and 2♀ each to CNC and USNM.
Additional material examined. USA: KENTUCKY: EDMONSON COUNTY, Mammoth Cave NP, Cinnamon Fern Bog, UV light trap, 7.vi.2007, C. Parker & J. Robinson (1♂, USGS); Thru Sprs, UV light trap, 15– 16.viii.2006, C. Parker & J. Robinson (3♂, USGS). HART COUNTY, Three Hundred Sprs nr Munfordville, N37°17′29.85″ W85°43′45.70″, 29.ix.2008, JKM—1♂. Unnamed trib Lynn Camp Crk, 10.iv.2008, JKM—1♂. TAYLOR COUNTY, Little Angel Spr, Trib Craig’s Crk, N of Campbellsville, N37°26′40″ W83°21′18″, 9.vi.2005, JKM; 1.vii.2004, Malaise trap, G.K. Weddle—2♂. 17.iv.2005, JKM—1♂, 1♀, 1L; 15.ix.2005 —1♂. TENNESSEE: FRANKLIN COUNTY, Trib Turkey Crk, ex TN Rt 16 (Old Turnpike Rd.), Walls of Jericho SNA, N34°59′40.77″ W86°03′38.98″, 23.v.2008, JKM—1♂. MARION COUNTY, Spr @ US 64/TN41 opposite Raccoon Mtn, 243 m, N35°03′31″ W85°29′08″, 24.iv.2014, JKM—20♂, 7♀; 4.ix.2015 —5♂, 2♀. Daniel Cave Spr, N36°26′00″ W85°48'00.00″, 8.ix.2010, JKM—3♂. MORGAN COUNTY, Frozen Head SP, Flat Frk, N36°07′10.91″ W84°27′52.67″, 20.vi.2014, JKM—1♂. Obed Wild and Scenic R NP, Melton Mill Br @ Footbridge, Point Tr. below Lilly Bluff Overlook, 357 m, UV light trap, 6.ix.2005, C. Parker (2♂, USGS). PUTNAM COUNTY, Tayes Hollow Spr. @ TN Rt. 84, S of Monterrey, 498 m, N36°08′12″ W85°17′28″, 17.iv.2010, JKM—1♂, 2♀, 1L; 7.iii.2009 —4♂ & 2♀; 10.iii.2009 —3♂, 1♀, 6L; 31.iii.2013 —6♂, 4♀, 4L, 2P.
D. calciphila sp. nov.; 11, D. inextricata . Scale bar = 50 µm.
Diagnosis. This species can be distinguished from D. appalachiensis sp. nov. and D. inextricata by the following characters: Morphological. Ventral margin of gonostylus strongly convex; basal gonocoxal lobe with apex noticeably acuminate; cercus narrow, acuminate, as long as lateral width of proctiger. Molecular. Among the most significant differences within the 66 nucleotides (22 codons) shown ( Fig. 38 View FIGURE 38 ) that serve to distinguish this species from the other two are amino acid substitutions at the following codon positions: 2 (valine/methionine), 3 (alanine/proline), 14 (asparagine/serine), 18 (asparagine/serine), 19 (arginine-CG)/arginine-AG or lycine), and 21(glycine/absent).
Description. Male ( Fig. 3 View FIGURES 1 – 4 ). Same as D. appalachiensis sp. nov., except as follows: Wing length (n =13) 2.6– 3.1 (avg=2.9) mm. Wing darker smoky gray. Thorax generally darker brown ( Fig. 3 View FIGURES 1 – 4 ), most distinctly differing in katepisternum concolorous with head, anepisternum, and anepimeron and contrasting sharply against whitish to straw-colored mesocoxa. Meron brown, nearly as dark as katepisternum. Terminalia ( Figs 10 View FIGURES 9 – 11 , 15–17 View FIGURES 12 – 20 , 23 View FIGURES 21 – 24 ): 9S lightly sclerotized, with straight anterior margin. Proctiger heavily sclerotized ( Figs 15–17 View FIGURES 12 – 20 , 23 View FIGURES 21 – 24 ). Cercus narrow, acuminate, as long as lateral width of proctiger ( Figs 10 View FIGURES 9 – 11 , 15 View FIGURES 12 – 20 ). Basal gonocoxal lobe directed posterodorsally in lateral view with apex distinctly falcate ( Fig. 10 View FIGURES 9 – 11 ), appearing rectangular in ventral ( Fig. 16 View FIGURES 12 – 20 ) and terminal views ( Fig. 17 View FIGURES 12 – 20 ). Apical gonocoxal lobe blunt, directed mediolaterally, in lateral view appearing ca. 1/ 5X or less of gonostylus length ( Figs 10 View FIGURES 9 – 11 , 15 View FIGURES 12 – 20 ). Gonostylus triangular in lateral view, ca. 1.3–1.5X longer than greatest depth, ventral margin noticeably convex, bulbous ( Fig. 10 View FIGURES 9 – 11 ).
Female ( Fig. 4 View FIGURES 1 – 4 ). Wing length (n =4) 2.9–3.2 (avg=3.0) mm. Not reliably separated from D. appalachiensis sp. nov. or D. inextricata .
Etymology. Named for the karst geography (calc - = lime + - phil = loving) that largely defines the region in which it occurs.
Distribution. Currently known only from Kentucky and Tennessee ( Fig. 37 View FIGURE 37 ).
Remarks. This species is known from streams ranging from small first order hillside trickles ( Fig. 33 View FIGURES 31 – 36 ) to raging torrents ( Fig. 34 View FIGURES 31 – 36 ) originating from underground streams. In central Tennessee adults are already on the wing by early March, earlier than other dixids found in the region. This species has been collected in association with Dixa fusca , D. modesta sensu Peters , Dixa nr. repanda Peters, and a member of the Dixella indiana complex. This species is expected to occur in northeastern Alabama and possibly, southern Indiana . Morphologically and molecularly, this species is more distantly related to the other two species in the group than they are to one another.
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.