Allotrichoma robustum
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Ordo: Diptera
Familia: Ephydridae
Genus: Allotrichoma
Name
Allotrichoma robustum Mathis & Zatwarnicki, 2012 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
- Allotrichoma laterale of authors, not Loew 1860[1] [misidentification]. Becker 1896[2]: 121 [generic combination]. Williston 1897[3]: 4 [compared with Allotrichoma abdominale Williston]. Cresson 1942[4]: 108 [list, west coast of United States]. Wirth and Stone 1956[5]: 467 [key]. Wirth 1965[6]: 736 [Nearctic catalog, in part]. Cole 1969[7]: 397 [list]. Mathis and Zatwarnicki 1995[8]: 151–152 [world catalog, in part].
Description
This species is distinguished from congeners by the following combination of characters: Small to moderately small shore flies, body length 1.55–2.40 mm. Head: Medial facial carina above facial prominence shallow; labella broad, fleshy, shorter than mediproboscis; clypeus microtomentose, usually gray.
Thorax: Presutural supra-alar seta present. Pleural area lacking stripes. Wing with costal vein ratio 0.30–0.31; M vein ratio 0.37–0.42. Legs blackish brown to black; midtibia bearing numerous, erect setae along dorsal surface.
Abdomen: Male 5th sternal flap in lateral view (Fig. 49) moderately shallow, longer posteriorly, bearing several, tuberculate setulae apically; 5th medial process in lateral view (Fig. 49) elongate, conspicuously curved, C-shaped, bearing 4–5 setulae anteroapically. Male terminalia (Figs 45–48): Epandrium in posterior view (Fig. 45) like an inverted, laterally rounded, almost oval U; epandrium in lateral view (Fig. 46) relatively narrow dorsally, becoming wider ventrally than tapered to a broad point; cercus very robust, in posterior view (Fig. 45) as a elongate, pendulous, ventrolaterally projected process, becoming wider ventrally, apex flared, truncate, bearing numerous, long to very long setulae, very long setulae apicolaterally; cercus in lateral view (Fig. 46) essentially straight, widest subapically, then narrowed to blunt, ventral apex, some very long setulae curved apically or irregularly contorted; surstyli (ventral extensions of epandrium) in posterior view as nearly parallel, shallowly arched medially, narrow processes that bears a few setulae apically, surstylus in lateral view (Fig. 46) conspicuously arched, narrow, very slightly tapered process, not expanded apically; aedeagus in ventral view (Fig. 47) elongate, narrowly ovate, slightly tapered apically, in lateral view (Fig. 48) elongate, narrow, nearly straight; phallapodeme in lateral view (Fig. 48) narrowly triangular, keel narrow, prong-like, shorter than length, almost digitiform; gonite in ventral view (Fig. 47) somewhat bar-like, lateral margin shallowly sinuous, notched basally and medially pointed apically, bearing a subapical, ventral setula and an apical setula; gonite in lateral view (Fig. 47) wide basally, conspicuously but gently curved and tapered toward apex, with a subapical, setula and an apical setula.
Type material
The holotype male is labeled “Kern Riv. 4 - 1- [19]50 [handwritten by A. H. Sturtevant]/HOLOTYPE ♂ Allotrichoma robustum W. Mathis & T. Zatwarnicki USNM [red]/USNM ENT 00117959 [plastic bar code label].” The holotype male is double mounted (glued to a narrow, paper triangle), is in good condition (abdomen removed, dissected, stored in glycerin in an attached microvial), and is deposited in the USNM. Two paratypes are as follows: UNITED STATES. CALIFORNIA. Kern: Kern River (35°16.1'N, 119°18.4'W), 1 Apr 1950, A. H. Sturtevant (1♂; USNM). Nevada: Sagehen Creek (39°28.6'N, 120°07.9'W), 26 Jun 1974, R. L. Bugg (1♂; USNM). OREGON. Harney: (43°10'N, 119°0.1'W), 29 Jun 1953, A. B. Gurney (1♂; USNM).
Type locality
United States. California. Kern: Kern River (35°16.1'N, 119°18.4'W).
Distribution
(Fig. 50) Nearctic: United States (California, Oregon).
Etymology
The species epithet, robustum, is of Latin derivation and refers to the very robust cerci of this species.
Remarks
Among Nearctic species of Allotrichoma, Allotrichoma robustum has the most restricted distribution, being thus far known only from the Sierra Mountains in California and Harney County in Oregon.
Original Description
- Mathis, W; Zatwarnicki, T; 2012: Revision of New World Species of the Shore-fly Subgenus Allotrichoma Becker of the Genus Allotrichoma with Description of the Subgenus Neotrichoma (Diptera, Ephydridae, Hecamedini) ZooKeys, 161: 1-101. doi
Other References
- ↑ Loew H (1860) Neue Beiträge zur Kenntniss der Dipteren. Siebenter Beitrag. Die Europaeischen Ephydrinidae und die bisher in Schlesien beobachteten Arten derselben. Programm der Königlichen Realschule zu Meseritz 1860, 46 pp.
- ↑ Becker T (1896) Dipterologische Studien IV. Ephydridae. Berliner Entomologische Zeitschrift 41 (2): 91-276.
- ↑ Williston S (1897) Diptera Brasiliana. Part IV. Kansas University Quarterly series A, 6: 1-12.
- ↑ Cresson E (1942) Synopses of North American Ephydridae (Diptera) I. The subfamily Psilopinae, with descriptions of new species. Transactions of the American Entomological Society 68: 101-128.
- ↑ Wirth W, Stone A (1956) Chapter 14. Aquatic Diptera. Pp. 372–482. In: Usinger RL (Ed) Aquatic insects of California. 508+x pp. University of California Press, Berkeley.
- ↑ Wirth W (1965) Ephydridae. Pp. 734–759. In: Stone A, et al. (Eds) A catalog of the Diptera of America north of Mexico. Handbook, 276: 1696 pp. U.S. Department of Agriculture, Washington, D.C.
- ↑ Cole F, Schlinger E (1969) The flies of western North America. 693+xi pp. University of California Press, Berkeley, Los Angeles, and London.
- ↑ Mathis W, Zatwarnicki T (1995). A world catalog of the shore flies (Diptera: Ephydridae). Memoirs on Entomology, International 4: vi+423 pp.
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