Comprehensive Description

provided by Smithsonian Contributions to Zoology
Lamproscatella (Thinoscatella) quadrisetosa (Becker)

Scatella quadrisetosa Becker, 1896:229.

Scatella (Lamproscatella) quadrisetosa.—Becker, 1926:85.—Sturtevant and Wheeler, 1954:176 [review, in part].

Lamproscatella quadrisetosa.—Cresson, 1930:126.—Wirth, 1965:756 [catalog, in part].

DIAGNOSIS.—Specimens of this species and L. lattini very closely resemble each other and on the basis of external morphology alone, cannot be consistently distinguished. Structures of the male terminalia, however, may be used to reliably characterize the species. Males of L. quadrisetosa have the ventral extension of the gonite gently rounded throughout its length, without recurving or expanding apically (Figures 31–32).

DESCRIPTION.—Small to moderately small shore flies, length 1.87 to 2.76 mm (averaging 2.46 mm); otherwise similar to description of L. lattini except for the following specific details: eye-to-cheek ratio averaging 1 : 0.47; costal vein ratio averaging 1 : 0.17; M1+2 vein ratio averaging 1 : 0.64.

TYPE MATERIAL.—Lectotype male (here designated) is labeled: “Norwegen, 8/8 36219/quadrisetosa [handwritten]/Typus [red]/LECTOTYPE Scatella quadrisetosa Becker by W. N. Mathis [red bordered].” A female specimen with the same label data as the lectotype is herein designated as paralectotype. The lectotype and paralectotype are in the Humbolt University insect collection, Berlin, D. D. R. In the original description, Becker (1896) also stated that these specimens were collected on the beach at “Molde Fjorder in Norwegen.”

OTHER SPECIMENS EXAMINED.—CANADA: MANITOBA: Churchill, 16 Jun–9 Aug, 1930–1948, O. Bryant, D. G. Denning, G. E. Shewell (8 , 21 ; CAS, CNC, UMN). NEW BRUNSWICK: Tabusintac, 4 Aug 1939, J. McDunnough (4 , 3 ; CNC). NORTHWEST TERRITORIES: Eskimo Point, 28 Jun–29 Jul, 1948–1950, J. R. Vockeroth, G. R. Roberts (17 , 14 ; CNC). NOVA SCOTIA: Petpeswick, 29 Jul 1971, B. Wright (1, 1; CNC). UNITED STATES: MASSACHUSETTS: Essex Co., Gloucester, 20 Jun 1924, C. W. Johnson (1; ANSP).

GEOGRAPHIC DISTRIBUTION (Figure 38).—This species has a transboreal, Holarctic distribution. In North America it occurs mainly along the coasts of northern Canada and the east coast as far south as Massachusetts.

DISTRIBUTION.—Members of this subgenus are the most widespread of the genus, occurring in all major faunal realms except for the Neotropical and Australian. In North America, their distribution is almost exclusively western, where several of the species occur in sympatry. There are a few collection records east of the 100th meridian.

NATURAL HISTORY.—Very little is known concerning the habitat preferences of members of this subgenus. North American species generally occur in freshwater environments, but specimens are occasionally collected near saline or alkaline water systems. In particular, most collections of L. brunnipennis are from coastal areas with exposure to the Arctic Ocean.
bibliographic citation
Mathis, Wayne Neilsen. 1979. "Studies of Ephydrinae (Diptera: Ephydridae), II: Phylogeny, Classification, and Zoogeography of Neartic Lamproscatella Hendel." Smithsonian Contributions to Zoology. 1-41. https://doi.org/10.5479/si.00810282.295


provided by World Register of Marine Species
Seashores & saltmarshes.
WoRMS Editorial Board
bibliographic citation
Cheng, L. (Ed.). (1976). Marine insects. North-Holland Publishing Company: Amsterdam, The Netherlands. ISBN 0-444-11213-8. XII, 581 pp.
Lanna Cheng [email]