Diptera; Sphaeroceridae; Limosininae)

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Diptera; Sphaeroceridae; Limosininae) View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by UNL | Libraries University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Center for Systematic Entomology, Gainesville, Insecta Mundi Florida September 1995 Sclerocoelus and Druciatus, new genera of New World Sphaeroceridae (Diptera; Sphaeroceridae; Limosininae) S. A. Marshall University of Guelph, Guelph, Ontario, Canada Follow this and additional works at: https://digitalcommons.unl.edu/insectamundi Part of the Entomology Commons Marshall, S. A., "Sclerocoelus and Druciatus, new genera of New World Sphaeroceridae (Diptera; Sphaeroceridae; Limosininae)" (1995). Insecta Mundi. 143. https://digitalcommons.unl.edu/insectamundi/143 This Article is brought to you for free and open access by the Center for Systematic Entomology, Gainesville, Florida at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Insecta Mundi by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. INSECTA MUNDI, Vol. 9, No. 3-4, September - December, 1995 283 Sclerocoelus and Druciatus, new genera of New World Sphaeroceridae (Diptera;Sphaeroceridae; Limosininae) S.A. Marshall Department of Environmental Biology University of Guelph Guelph, Ontario, Canada N1G 2W1 Abstract: The new genus Sclerocoelusis describedfor a large group of New World species including Sclerocoelus sordipes (Adams) new combination, Sclerocoelusregularis (Malloch) new combination, Sclerocoelusplumiseta (Duda) new combination, and about 40 undescribed species. The widespread Nearctic species Limosina sordipes Adams is redescribed and designated as the type species of Sclerocoelus. Lectotypes are designated for Limosina sordipes Adams and Limosina evanescens Tucker. The new genus Druciatus is described for a group of 7 undescribed species fiom Central America, South America, and the Caribbean. The type species, Druciatus ovisternus n.sp.,is described from Dominica and the Dominican Republic. Introduction male genitalia, especially the complicated genital pouch (Fig. 10) and subcerci, are both defining and The higher classificationof New World Sphaero- diagnostic for this group. Females of Sclerocoelus ceridae is poorly resolved, with several undescribed superficially resemble females of the Spelobia clu- genera and many undescribed species which can- nipes species group, which also have a broad lunule not currently be placed to genus. This paper defines and broad alula. Members of the latter group lack two of the more distinctive unnamed monophyletic the proximalposterodorsal mid tibialbristle present groups of New World Limosininae as the new in similar Sclerocoelus, and all Spelobia lack the genera Sclerocoelus and Druciatus. Both genera enlarged intraalar bristle. include several undescribed species which will be fully dealt with in subsequent papers. The purpose Description: Length 1.0-1.9mm; strongly prui- of this paper is to define the genera and make them nose; body colour brown to black. Postvertical bris- available for current work on generic classification tles short, cruciate, slightly longer than divergent of the Sphaeroceridae. postocellar bristles. Inner occipital bristle large, similar in size to ocellar bristle. Lunule broad or Materials and Methods very broad (Fig. 8), usually rounded; face concave. First flagellomere short, twice as high as long; Genital characters were examined on abdomens arista dorsolateral, long-ciliate. Eye height 2.5- cleared in hot KOH, rinsed in water and acetic acid, 4.5X genal height; anterior genal bristle present; then placed in glycerin. Terminology for genitalic gena pruinose except for narrow, vertical posterior morphology follows McAlpine (1981). strip and small shining area at anteroventral cor- ner of eye. Palpus with several weak ventral bris- Sclerocoelus new genus tles and a strong apicoventral bristle. Prosternum linear, often with small, bristle- Diagnosis: A very broad alula (Fig. 8), broad bearing sclerites in membrane beside prosternum. lunule (Fig. 8), and an enlarged intraalar bristle Dorsocentral bristles in 2 pairs, anterior pair only just anterior to the prescutellar dorsocentral bris- slightly larger than acrostichalbristles; acrostichals tle (Fig. 8) are the most distinctive external charac- in 4-9 rows between anterior dorsocentrals; pres- ters of this genus. Combined with the tibia1 chaeto- cutellar acrostichal bristles and posterior intraalar taxy (only the female with a mid ventral bristle, bristles enlarged. small posterior or posterodorsal proximal bristle) Mid tibia of male curved, with row or patch of and wing venation (costa ending at end of R4+5), ventral bristles distally; apex also with smaller these features allow easy diagnosis of the genus anterior and posterior bristles. Mid tibia of female using external characters. Several attributes of the with long apicoventral and mid ventral bristles. 284 Volume 9, nos. 3-4, September-December, 1995, INSECTA MUNDI Both sexes usually with two proximal and two lus variable, usually short and broad with paired distal anterodorsal bristles, a short proximal poste- dorsal and ventral sclerites. rior or posterodorsal bristle, and one or more distal posterodorsal bristles. Male mid femur with stout Female abdomen: Abdomen short, broad; tergite ventral bristles at base. Mid basitarsus with an 8 usually divided medially; epiproct usually weakly enlarged ventral bristle in proximal half. Hind tibia sclerotized, with 2 bristles. Cerci variable by spe- with a small apicoventral bristle; only first tarsom- cies group, usually short with weak bristles, with a ere of hind leg short and swollen. stout apical bristle in one clade only. Sternite 7 Wing broad, membrane clear, alula very broad; large, sternite 8 variable, but often reduced to two R,,, almost straight, slightly bent up before apex; dark sclerites. Three or (rarely) 2 spermathecae, costa ending at R,,, or no more than a single vein- usually with prominent invaginations and short width beyond R,,,; R,,, weakly sinuate, strongly to ducts. very strongly bent towards costa at apex. Anal vein weakly to strongly S-shaped. Second costal sector Type species: Limosina sordipes Adams usually subequal to third. Other included species: Sclerocoelus includes Male abdomen: Preabdominal sternites heavily about 40 undescribed species, mostly Neotropical sclerotized, usually with long marginal bristles; and includmg some of the most common insects of segments 3,4 and 5 with setose membrane. Stern- New World cloud forests. The described species ite 5 modified; posteromedial part densely setose or, which belong in Sclerocoelus are as follows: Sclero- rarely, with a small patch of stout bristles. Anterior coelus sordipes Adams, Sclerocoelus regularis part of sternite often pale and striate where it is (Duda) and Sclerocoelus plumiseta (Duda), all new overlapped by sternite 4. Synsternite 6+7 large and combinations. usually complex; anteriorly with a broad lobe pro- jecting inside sternite 5 on left side (sinistral flange); Comments: Members of this genus can usually be left side usually atleast dorsally fused with sternite collected in large numbers by sweeping over wet 8; ventral part divided into several sclerites form- leaves, especially in cloud forest habitats where ing genital pouch (Fig. 10). Right side of abdomen Sclerocoelus is invariably abundant. The type spe- with sixth right spiracle usually in a separate cies is a nearctic species usually associated with sclerite (spiracular sclerite); a ring-shaped sclerite deciduous forests. Nearctic members of this genus present in membrane anterior to lower right corner would key to Opalimosina in Marshall and Rich- of epandrium (Fig. 10). Sternite 8 free from epan- ards (1987). drium or fused at lower right corner only. Poster- oventral corners of epandrium widely separated, Etymology: The generic name refers to the genital usually projecting medially as narrow lobes. Stern- pouch lined by sclerites derived from sternite 6. ite 10 (subepandrial sclerite) well developed, fused with anterodorsal part of surstylus, often incom- plete medially and articulating with subcercus (Fig. Sclerocoelus sordipes Adams 4). Subcercus (structure of uncertain homology New Combination below the normal position of the cercus) invariably present, large, often complex, separate from epan- Lirnosina sordipes Adams 1904: 455. drium. Pseudocercus (structure of uncertain ho- Limosina evanescens Tucker 1907: 102. mology at inner ventral corner of epandrium; use of Leptocera (Scotophilella) evanescens: Spuler 1925:160; Richards 1965: 724. this term is after Roh6 ek, 1982) usually present Leptocera (Limosina) sordipes: Richards 1965: 724. between subcercus and epandrium, sometimes fused with subcercus or epandrium, often with 3 bristles Description: Length body brown; legs (Fig. '1. Surst~lusbroad, at leastposteriorly, and halter pale brown; face, gens and lower frons concave medially, with inner lobes or ridges; usual- luteous. Interfrontal area broad, flat and tapered, 'Y setae. H~~andrium devel- width at top equal to height; 3 equal interfrontal arms broad, separate from hypandrial ape- bristles, sometimes additional small upper or lower deme and from e~andrium-Paramere highly vari- interfrontalsetulae. ~~~~l~rounded, able. Basiphallus variable, with or without epiphal- distance width of ocellar tr.an- lus; ejaculatory apodeme present, small. Distiphal- INSECTA MUNDI, Vol. 9, No. 3-4, September - December, 1995 285 gle. Eye height
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