Agapetus artesus Ross, 1938

Etnier, David A., Parker, Charles R., John T. Baxter, Jr., Long, Todd M. & Drive, News Sentinel, 2010, A review of the genus Agapetus Curtis (Trichoptera: Glossosomatidae) in eastern and central North America, with description of 12 new species, Insecta Mundi 2010 (149), pp. 1-77 : 7-8

publication ID	https://doi.org/ 10.5281/zenodo.5353074
persistent identifier	https://treatment.plazi.org/id/039C87FB-FFF5-AF2C-FF47-FA10FBA9F385
treatment provided by	Felipe
scientific name	Agapetus artesus Ross
status

Treatment

Agapetus artesus Ross View in CoL

Fig. 3a, 3b, 3c View Figure 1-3 . Map 3

Agapetus artesus Ross 1938: 106 View in CoL

Type locality, Greer Spring, Phelps Co., MO. ( INHS)

Diagnosis. Agapetus artesus males lack denticles on the ventral arms or posterior margin of segment X. All other Agapetus species of the region covered have at least one denticle associated with the ventral arms and/or posterior margin of segment X.

Description. Male. Length 4.5-5.0 mm (n = 2). Male genitalia: Lateral view ( Fig. 3a View Figure 1-3 ), segment IX anterior margin angles down and forward at 60 o to mid-depth, then smoothly rounded and angling down and back at 65 o to slightly convex ventral margin; dorsal margin straight, 2/3 length of ventral margin; posterior margin angles down and back at 75 o to mid-depth and then down and forward at 60 o. Preanal appendage clavate, narrow at base, maximum depth 1/3 length, length 1/2 length of X; dorsal edge with about 8 erect setae. Sides of segment X sclerotized throughout, slightly more so along ventral margin; dorsal margin convex and smoothly sloping down to contact end of ventral arm; tip of X nearly reaching tips of inferior appendages. Inferior appendage length = 2.5 times depth; ventral margin slightly convex, dorsal margin straight, barely convergent toward symmetrically or asymmetrically rounded tip; the marginal denticle at distal end of ventral margin and similar submarginal denticle nearer dorsal margin than posterior margin appear as dark dots joined by a dark, straight, oblique line that slopes up and back at 65 o from the ventral denticle.

Dorsal view ( Fig. 3b View Figure 1-3 ). Segment IX with both anterior and posterior margins concave, posterior margin not apparent near midline where continuous with X. Segment X widest at base, sides of X sinuous and converging distally, apparently separated by membrane throughout on only specimen we have examined. Ventral arms of X not conspicuous. Preanal appendages clavate, narrowest at base, diverging from body axis at 30 o; tips rounded to produced into slight point on outer margin. Both pairs of denticles on distal 1/2 of inferior appendage pointed, transverse.

Ventral view ( Fig. 3c View Figure 1-3 ). Anterior base of IX weakly concave, posterior base slightly produced (160 o angle) between inferior appendage bases. Inferior appendage bases slightly swollen, in contact at base; outer margin nearly straight to rounded tip; inner margins remain nearly in contact for basal 1/3, then concave and divergent on middle 1/3 to ventral denticle, then concave and diverging from body axis at 30 o to near tip; dorsal margin from distal denticle to tip slightly divergent from body axis.

Emergence dates. 28 March-7 June, 8 October, 1 January.

Distribution. MO Oregon (2), Phelps (2).

Discussion. Apparently restricted to a few springs in only two counties in Missouri, and listed as a Category 2 species by the U.S. Fish and Wildlife Service Office of Endangered Species ( Moulton and Stewart 1996).

Etymology. Not mentioned in the description, but presumably based on artesian, an adjective pertaining to water flow in the spring-like habitats it and many Agapetus inhabit.