Pentachaeta inserta, McAlpine, 2014

McAlpine, David K., 2014, Review of the Australian Genus Pentachaeta (Diptera: Heleomyzidae), with Descriptions of Nine New Species, Records of the Australian Museum 66 (5), pp. 247-264 : 254-256

publication ID 10.3853/j.2201-4349.66.2014.1631

persistent identifier

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scientific name

Pentachaeta inserta

sp. nov.

Pentachaeta inserta n. sp.

Figs 18–22 View Figures 18–22

Type material. Holotype ♂. New South Wales: Mount Wilson, Blue Mountains , c. 33°31'S 150°23'E, c. 900 m, 5.xi.1977, D.K.M. ( AM K310593 ). Glued to card point, postabdomen in genitalia tube on same pin GoogleMaps . Paratypes. New South Wales: 10♂♂, Mount Wilson, Jan., Mar. , Oct. , Nov., Dec., 1956–2002, D.K.M. ( AM, USNM) ; 1♂, Putty Road at Tinda Creek , Oct. 1987, D.K.M. ( AM) ; 1♂, Victoria Falls, Blue Mountains , Nov. 1965, D.K.M. ( AM) ; 1♂, Wentworth Falls , Nov. 1958, D.K.M. ( AM) ; 3♂♂, Jenolan Caves , no date, J.C.W. ( AM) .

Other material examined. New South Wales: Hungry Head, near Urunga ( AM); Mongalowe River, Monga Road ( ANIC); Clyde Mountain, 2400 ft [c. 730 m] ( AM); Clyde Mountain, Cabbage Tree Creek ( ANIC); Rutherford Creek, Brown Mountain ( ANIC); Tantawangalo Forest, near Candelo ( AM); Saw Pit Creek, Snowy Mountains ( AM); Maxwell’s Creek, Nadgee State Forest ( AM). Victoria: Bucklands, East Gippsland ( ANIC); Dynamite Creek, Bonang Highway ( ANIC); Martin’s Creek, Bonang Highway ( AM); Tunnel Bend, near Jamieson ( AM); Myer’s Creek, near Healesville ( ANIC); Fernshaw, near Healesville ( AM); Warburton ( AM); Belgrave, near Melbourne ( AM, MV, USNM); Sherbrooke Forest, near Ferntree Gully ( AM, ANIC); Splitters Falls, Wannon River, and Mount William, Grampians National Park ( AM). Tasmania: 2 miles [c. 3 km] east of Tonganah, Scottsdale district ( AM); Pieman River, near Rosebery ( AM); Renison Bell, Pieman River district ( AM); “Nat. Park” [Mount Field National Park] ( ANIC).

Description (male) Resembling P. edwardsi and related species without sexual dimorphism of tibiae; agreeing with description of that species, except as indicated below.

Coloration generally as for genus; details as given for P. edwardsi .

Abdomen. Surstylus ( Fig. 18 View Figures 18–22 ) moderately elongate, only slightly tapering distally, with many long microtrichia on c. basal two thirds of length on outer surface, apically rounded with very small setulae, some crowded at extreme tip, with one or few larger setulae on subapical part of inner surface, with tuft of short to medium-sized setulae on very short cap-like, slightly convex sclerite at base of inner surface, often a moderately large setula located near tuft; subepandrial process ( Fig. 20 View Figures 18–22 ) moderately slender, with large but not dense setulae; gonostylus tumid and rounded distally, with rather large setulae and some smaller posterior ones, without scabrous or pustulose zone, subtended by a simple sheathing lobe; aedeagus ( Fig. 22 View Figures 18–22 ); membranous surface of bulb with six to ten invaginated, subconical sclerotized teeth of various sizes; cercus ( Fig. 19 View Figures 18–22 ) densely microtrichose, except anteriorly, not much broadened near mid-length, but slightly gibbous before anterior extremity, which forms a simple, anteriorly directed, slightly narrowed papilla bearing minute setulae, in contrast to large setulae on most of length of cercus.

Dimensions. Total length 3.1–3.5 mm; length of thorax, 1.6–1.7 mm; length of wing, 4.0– 4.3 mm.

Distribution. New South Wales: mainly mountainous districts, but recorded for North Coast (Hungry Head). Victoria: widely distributed as far west as Grampians National Park. Tasmania: probably widely distributed. Map references 3L, 4L, 4N, 5L, 5N, 5O, 6K, 6L, 7J, 7K, 8I ( Fig. 4 View Figure 4 ).


Among the species with predominantly pale fore tibia and no sexual dimorphism of the tibiae, males of P. inserta are distinguished by the form of the cercus, which lacks distinctive armature, the distally rounded gonostylus, which lacks a scabrous or pustulose zone, and by the presence of invaginated conical teeth on bulb of the aedeagus ( Figs 21, 22 View Figures 18–22 ). Nothing approaching these structures has been observed in other species.

The specific epithet is a Latin adjective referring to the invaginated teeth inserted in the bulb of the aedeagus.


Australian Museum


Smithsonian Institution, National Museum of Natural History


Australian National Insect Collection


University of Montana Museum













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