Dicranomyia (Erostrata) globithorax Osten Sacken, 1869

Kato, Daichi, Tachi, Takuji & Gelhaus, Jon, 2018, Revision of the subgenus Dicranomyia (Erostrata) Savchenko, 1976 (Diptera, Limoniidae) of Japan, Zootaxa 4441 (1), pp. 181-194: 182-184

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Dicranomyia (Erostrata) globithorax Osten Sacken, 1869


Dicranomyia (Erostrata) globithorax Osten Sacken, 1869 

( Figs. 3–6, 8–13View FIGURES 1–3View FIGURES 4–13, 35View FIGURES 35–40, 41View FIGURES 41–44)

Dicranomyia globithorax Osten Sacken, 1869: 74  . Type localities (syntypes): USA, Washington D. C., and New Hampshire, White Mts.;

Limonia (Limonia) globithorax Rogers, 1942: 78  ; Byers, 2002: 14;

Dicranomyia (Erostrata) globithorax globithorax Oosterbroek, 2018  .

Specimens examined: Lectotype male, USA, New Hampshire, White Mts. , collecting date not given, Osten Sacken ( MCZ)  . Paralectotype: USA: 1 female, Washington D. C., collecting date not given, Osten Sacken ( MCZ)  . Other materials: JAPAN: [Honshu] 3 females, Aomori, Nishimeya-mura, Kawaratai, Ôkawa Path , 1.IX.2013, D  . Kato ( BLKU); 3 males, 5 females, same data as previous except 18.IX.2013  ; 4 males, 1 female, same data as previous except 1.IX.2014  ; 1 male, 1 female, same data as previous except 8.IX.2014  ; 1 male, 30.IX.2014, Aomori, Towada-shi, Okuse, Tsutanuma Path , 30.IX.2014, D  . Kato ( BLKU); 1 female, Aomori, Hirosaki-shi, Ichinowatari-Washinosu , 5.IX.2013, D  . Kato ( BLKU); 1 female, Iwate, Hachimantai-shi, Tôshichi Spa , 28.VIII.2014, D  . Kato ( BLKU); 1 male, Yamagata, Sakata-shi, Kusatsu, Yunodai Spa , 18.IX.2014, D  . Kato ( BLKU); 1 female, Nagano, Ueda-shi, Sanada-machi-Osa, Kakuma Valley , 21.VIII.2013, D  . Kato ( BLKU); 1 male, 1 female, Hiroshima, Hatsukaichi-shi, Yoshiwa, Mt. Misaka-yama , 2.IX.2015, D  . Kato ( BLKU). CANADA: [Quebec]: 1 male, Riviere du Loup , 17.VI.1929, C  . P. Alexander ( USNM). USA: [Massachusetts]: 1 male, Amherst , 25.IV.1931, F  . R. Shaw ( USNM); [Pennsylvania] 6 males, Philadelphia, West Fairmount Park , Malaise trap, 22.VII –16.VIII.1998, J  . Gelhaus (ANSP).

Diagnosis. General coloration ( Fig. 35View FIGURES 35–40) brown to dark brown. Head blackish; palpus one segmented. Abdomen dark brown. Male genitalia ( Fig. 4View FIGURES 4–13) with tergite 9 bearing a pair of rounded lobes on posterior margin; gonostylus truncated, tip covered with stout spines. Female ovipositor ( Figs. 11–13View FIGURES 4–13) with cercus weakly curved dorsally; hypogynial valve about 1.4 times as long as sternite 8; furca curled inward along lateral margins, projecting slightly beyond base of cercus.

Description. Male. Body length 3.5–4.5 mm. Wing length 4.4–5.6 mm.

Head. Dark brown to black; antenna brown to dark brown, pedicel almost as wide as basal flagellomeres, flagellar segments with distinct pale pubescence; palpus oval, one segmented.

Thorax. Brown to dark brown, lateral sides of postpronotum and anepimeron near wing base weakly paler; antepronotum, pronotum, and anepisternum sometimes slightly darkened. Wing ( Fig. 3View FIGURES 1–3) blackish tinged. Legs dark brown, coxae, trochanters, and base of femora slightly paler. Halter dark brown.

Abdomen. Dark brown; sternite 7 with a small, conical internal sac on posterior margin ( Fig. 10View FIGURES 4–13). Male genitalia ( Fig. 4View FIGURES 4–13) with tergite 9 oval, bearing a pair of rounded lobes on posterior margin, each lobe separated by wide U- or V-shaped notch, longitudinal internal ridge distinct on middle of tergite 9; gonocoxite cylindrical, about as long as width of tergite 9, ventromesal lobe finger-shaped, about 1/3 as long as gonocoxite and 1.5–2 times as long as width; gonostylus slightly shorter than gonocoxite, weakly narrowed toward truncated tip, tip covered with stout spines, outer surface of gonostylus with a small protuberance bearing two setae near base; paramere ( Figs. 5– 6View FIGURES 4–13) with mesal-apical lobe slender, pointed at tip, lateral part of paramere produced into ribbon-like plate, curled laterally and ventrally, the plate 1/4 as long as width of paramere in lateral view; aedeagus ( Fig. 5View FIGURES 4–13) cylindrical, narrowed near tip, tip shortly bilobed, directed ventrally.

Female. Body length: 3.0– 5.3 mm. Wing length: 4.0– 6.8 mm.

Almost same as male except terminalia. Ovipositor ( Figs. 11–13View FIGURES 4–13) brown to dark brown; tergite 10 in lateral view narrow, about half height of tergite 8, tapered near tip, with two pairs of long setae on posterior margin; cercus slightly shorter than sternite 8, weakly curved dorsally, extending beyond tip of hypogynial valve, ventral margin with weak setae on basal 1/3; sternite 8 almost square with a pair of distinct internal ridge; hypogynial valve stout, basal part wider than tergites 9–10 in lateral view, the valve about 1.4 times as long as sternite 8, tip subacute; furca about 1.5 times as long as width, tip pointed with several setae, extending slightly beyond base of cercus, lateral margin bent medially.

Distribution. Japan (Honshu ( Fig. 41View FIGURES 41–44)), Eastern Canada, Eastern USA. This species is recorded from Japan for the first time.

Remarks. We note that D. globithorax Osten Sacken  differs from D. globithorax globulithorax Alexander, 1924  in the structure of the gonotylus ( Fig. 4View FIGURES 4–13) being wider at base and apically truncate in D. gobithorax  , while slightly wider on distal half than basal half and apex with outer edge produced in D. globithorax globulithorax  . Based on this distinct morphological difference, we elevate these subspecies to species. Within D. globithorax  , there is a slight morphological difference in the male genitalia between Japan and USA: tip of mesal-apical lobe of paramere is slightly more widened and rounded in the American specimens than Japanese ones ( Figs. 8–9View FIGURES 4–13). We treat this difference as a variation within the species. Osten Sacken (1869) described D. globithorax  with one specimen of each sex, labeling them with “ Type ”. We designate the male of the species as Lectotype and the female as the Paralectotype in this paper.


Museum of Comparative Zoology


Smithsonian Institution, National Museum of Natural History














Dicranomyia (Erostrata) globithorax Osten Sacken, 1869

Kato, Daichi, Tachi, Takuji & Gelhaus, Jon 2018

Dicranomyia globithorax

Osten Sacken, 1869 : 74

Limonia (Limonia) globithorax

Rogers, 1942 : 78
Byers, 2002 : 14