Polycentropus carlsoni Morse, 1971

Orfinger, Alexander Benjamin, 2023, Taxonomic revision of the Polycentropus confusus species group (Trichoptera: Polycentropodidae), Journal of Natural History 57 (41 - 44), pp. 1825-1916 : 1841-1845

publication ID

https://doi.org/ 10.1080/00222933.2023.2271609

DOI

https://doi.org/10.5281/zenodo.10498671

persistent identifier

https://treatment.plazi.org/id/03BF3616-8B4B-2616-FE1B-234DFBAFFDA5

treatment provided by

Plazi

scientific name

Polycentropus carlsoni Morse
status

 

Polycentropus carlsoni Morse View in CoL

( Figures 9–10 View Figure 9 View Figure 10 , 39 View Figure 39 )

Polycentropus carlsoni Morse, 1971: 78 View in CoL , fig. 3, J; type locality ′ Wildcat Creek , Clemson, S .C̍. (INHS).

Polycentropus carlsoni Armitage and Hamilton, 1990 View in CoL : figs. A–D, J.

Polycentropus carlsoni Hoffman and Morse, 1990: 277–278 View in CoL , figs. 5–9, ♀.

Diagnosis. Males of P. carlsoni are most similar to those of P. aileenae , P. blicklei , P. carolinensis and P. maculatus . From males of these species, males of P. carlsoni are identified by the shorter, stockier and deflexed basodorsal process of each inferior appendages, the slightly ventrally recurved apex of the ventral portions of each inferior appendages, and the shape of the body of each pre-anal appendage which in P. carlsoni is round and lacking any posteroventral process.

Females of P. carlsoni are most similar to those of P. aileenae , P. blicklei and P. maculatus . Unlike the blade-like internal parts of gonopods VIII of P. aileenae , those of P. carlsoni are subrectangular. From P. maculatus , females of P. carlsoni are distinguished by the kukri blade-like shape of the ventral plates in ventral view that terminate beyond the internal parts of gonopods VIII, vs the subtriangular ventral plates that terminate anterior to the internal parts of gonopods VIII.

Adult description

General. Length. of male 5.2–6.9 mm (mean = 6.1 mm; n = 5). Length of female 6.1– 8.1 mm (mean = 6.9 mm; n = 5).

Male genitalia ( Figure 9A–E View Figure 9 ). Abdominal segment VIII annular. Terga IX and X fused, membranous, extended caudad over bases of intermediate appendages. Sternum IX subovoid in lateral view. Intermediate appendages originating beneath terga IX+X and extending beyond them, curved slightly ventrad, their apices each bearing 4 small setae; in dorsal view apices proximate, subparallel. Bodies of pre-anal appendages each round, lacking posteroventral process; dorsal process long, curved ventrad, extending to apex of ventral portion of inferior appendage, acute apically; in dorsal view slender, elongate, subparallel. Inferior appendages in lateral view each with capitate basodorsal process deflexed with short neck and stocky subtriangular head round dorsally and projecting ventrad with its pointed apex occasionally visible above main body of appendage, occasionally hidden behind main body of appendage, main body of appendage tapering evenly along length, terminating in round, slightly dorsally recurved apex, terminating at approximately apex of dorsal process of pre-anal appendage; in ventral view tapering gradually along length, round apices inflected mesally, basodorsal process partially hidden by main body of inferior appendage, with only mesal margins exposed, in cleared specimen broad, with medial pointed projection; in caudal view oblong, with medial projection round. Phallus a fully sclerotised tube, in lateral view with large base, curved slightly ventrad slightly beyond mid-length, apical section subrectangular, internal spinules absent, internal phallic sclerite short, oriented posteroventrally, with acute anterior broadening to a subrectangular posterior apex.

Female genitalia ( Figure 10A–B View Figure 10 ). Venter VIII in ventral view with ventral plates convergent, narrow, blade-like as a kukri sword, tapering apically, covered with setae; in lateral view each terminating in round posterior apex; posterior apex of external parts of gonopods VIII in ventral view with posterior margin mesally produced and round; in lateral view not extending beyond ventral plates in round process; internal parts of gonopods VIII in ventral view visible through venter VIII even in uncleared specimen, appearing longitudinally wrinkled, darker than surrounding tissue, subparallel, subrectangular, with apices distinctly anterior of apices of ventral plates; in ventral view anterior part of genital chamber sclerotised, subovate; processus spermathecae ovoid with central elevation bearing opening of ductus spermathecae.

Larva. Described by Orfinger et al. (2023).

Pupa. Unknown.

Notes. Moulton ̍s 2007 record of P . carlsoni from Tennessee is erroneous and was based on individuals (1 male, 1 female) of P . aileenae. In addition, although the holotype was initially deposited at the University of Georgia Collection of Arthropods , it was transferred to the Illinois Natural History Survey where it is currently housed.

Biology. This species is found at first- or second-order cool streams with rocky substrates. Adults of P. carlsoni have been collected from April to November while the only known, late-instar larva was collected in October. As noted by others (e.g. Moulton 2007), collections of this apparently uncommon species generally comprise fewer than five individuals. Unlike most Polycentropus species, adults of P. carlsoni have been collected most frequently using malaise traps or modified emergence traps, while only occasionally being taken in UV light traps. This suggests that perhaps this species flies earlier in the evening than other species or during the day under shaded riparian habitats with dense canopies.

Distribution ( Figure 39 View Figure 39 ). USA: Alabama, Maryland, North Carolina , Pennsylvania, South Carolina , Virginia.

Given the known distribution of P. carlsoni , it would be unsurprising if it were eventually reported from northern Georgia, southern or eastern Tennessee, southern or eastern Kentucky, or West Virginia.

Material examined. Holotype: USA. South Carolina : Pickens County, Wildcat Creek, [N34°45 ʹ 34.20″, W82°51 ʹ 03.24″], P. Carlson coll., 23-iv-1968, 1 male (left inferior appendage broken; INHS Trichoptera 24,565). Paratype: USA. South Carolina : Pickens County, Wildcat Creek , [N34°45 ʹ 34.20″, W82°51 ʹ 03.24″], P GoogleMaps . Carlson coll GoogleMaps ., 23-iv-1968, 1 male ( INHS Trichoptera 24,564) .

Non-type material. USA. Pennsylvania: Philadelphia County, Tributary of Wissahickon Creek , at seep crossing trail, [N40°02 ʹ 38.04″, W75°12 ʹ 55.80″], N GoogleMaps . Macelko coll GoogleMaps ., 24-X-2021, 1 larva ( FAMU) . South Carolina : Pickens County, Clemson, Wildcat Creek, P . Carlson coll ., 12-v-1958, 1 female ( CUAC0000107319 About CUAC ) . 1iv-1968, 1 female ( CUAC0000107323 About CUAC ) . 20-iv -1968, 1 male ( CUAC0000107317 About CUAC ) . 20-iv-1969, 1 male ( CUAC0000107316 About CUAC ) . 24-iv-1968, 1 female ( CUAC0000107320 About CUAC ) . Issaqueena Forest , N . Fork of Creek at Holly Springs Picnic Area , Malaise trap, 730 masl, K .M . Hoffman coll ., 12–20-vi-1988, 3 males ( CUAC0000107315 About CUAC ) . 1 female ( CUAC0000107321 About CUAC ) . 1 female ( CUAC0000107322 About CUAC ) . Wildcat Creek , 770 masl, 27-vi-4-vii-1988, 1 female ( CUAC0000107318 About CUAC ) . Virginia: Fairfax County, Gulch Stream, O .S. Flint coll ., vi-2008, 13 males, 27 females ( CUAC000107325 About CUAC ) .

INHS

Illinois Natural History Survey

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Trichoptera

Family

Polycentropodidae

Genus

Polycentropus

Loc

Polycentropus carlsoni Morse

Orfinger, Alexander Benjamin 2023
2023
Loc

Polycentropus carlsoni

Hoffman KM & Morse JC 1990: 278
1990
Loc

Polycentropus carlsoni

Morse JC 1971: 78
1971
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