New species of Chimerothalassius Shamshev & Grootaert (Diptera: Dolichopodidae: Parathalassiinae) from the West Indies and Costa Rica
Author
Brooks, Scott E.
Author
Cumming, Jeffrey M.
text
Zootaxa
2018
2018-02-28
4387
3
511
523
journal article
30625
10.11646/zootaxa.4387.3.6
dc004088-b648-4c94-bd4b-81131365cecf
1175-5326
1187707
A55E7D25-7617-484E-B288-69B83F7CBED1
Chimerothalassius
sp.
(Figs 10, 17, 18, 19, 22)
Material Examined.
COSTA RICA
:
Herradura
,
21.X.1993
,
light trap
(UV flourescent on white sheet) at edge of ocean beach,
A. Borkent
, CD1628 (
2♀
,
CNC
)
;
Caldera
,
24.viii.1993
, swept rocks amidst sand strip along ocean,
A. Borkent
, CD1548 (
1♀
,
CNC
)
.
Diagnosis.
Minute (wing length 1.0–
1.1 mm
); head, thorax and abdominal tergites with dense grey pruinosity mostly covering brownish ground colour; abdominal sternites mostly pale and concolourous with adjacent membrane, sternite 6 with weak grey pruinosity; legs mostly pale or weakly infuscate, tarsi infuscate apically; setae of body and legs white; head with lower 5–7 postocular setae long; palpus large, broadly subtriangular, lacking
FIGURES 7–10.
Wings (dorsal surface).
7.
Chimerothalassius runyoni
sp. nov.
, specimen of unknown sex from Rodney’s Rock,
Dominica
.
8.
Same, female
paratype
from
Woodlands Beach
,
Montserrat
.
9.
Same, male
paratype
from
Woodlands Beach
,
Montserrat
.
10.
Chimerothalassius
sp., female from Herradura, Costa Rica. Abbreviations: C—costa; cua—anterior cubital (=anal) cell; h—humeral crossvein; M1, M4—medial veins; R1, R2+3, R4+5—radial veins.
ventral bristles; fore coxa with prominent setae on anterior surface, lower 2–3 setae long; fore femur with series of 3–4 long setae ventrally; wing about
2X
longer than wide (Fig 10); costal section between R2+3–R4+5 shorter than R4+5–M1 section; female terminalia with tergite 8 medially divided, narrowly fused with sternite 8 anterolaterally; tergite 10 divided medially with three acanthophorite setae on each broadly-tipped hemitergite; cercus with long apical seta and long lateral seta (
Fig. 18
); spermathecal duct an unsclerotized tube with broad ridged sperm pump in basal part and conical terminal expansion giving rise to sac-like spermatheca (
Fig. 17
). Male is unknown.
Distribution.
This undescribed species is currently known only from two localities on the Pacific coast of
Costa
Rica
(
Figs 19
,
22
).
Remarks.
Like the other known species of
Chimerothalassius
, this species appears to be associated with beach rocks, however the two specimens from Herradura were taken at a UV light trap placed near the shoreline.