Alaptus terebrans Kryger, 1950

Serguei V. Triapitsyn, 2017, Revision of Alaptus (Hymenoptera: Mymaridae) in the Holarctic region, with taxonomic notes on some extralimital species, Zootaxa 4279 (1), pp. 1-92 : 77-80

publication ID	https://doi.org/ 10.11646/zootaxa.4279.1.1
publication LSID	lsid:zoobank.org:pub:9A6B42AF-E5B1-488D-9C15-4868E96F0363
DOI	https://doi.org/10.5281/zenodo.5098979
persistent identifier	https://treatment.plazi.org/id/03A3B84B-FFEA-FFF8-FF15-B0C5FDE57384
treatment provided by	Plazi
scientific name	Alaptus terebrans Kryger, 1950
status	stat. nov.

Treatment

Alaptus terebrans Kryger, 1950 View in CoL , stat. rev.

( Figs 167–179 View FIGURES 167 – 170 View FIGURES 171 – 172 View FIGURES 173 – 176 View FIGURES 177 – 179 )

Alaptus fusculus Westwood View in CoL [as (Haliday) Walker)]: Bakkendorf 1934: 17 –18 (host, illustration: misidentification), 131–132 (host).

Alaptus terebrans Kryger 1950: 33 View in CoL [as A. terebrans Förster View in CoL ], 36 [as A. terebrans Enock View in CoL ]. Type locality: St. Neots, Cambridgeshire Co., England, UK. Resurrected as a valid species from the previous synonymy under A. extremus Soyka View in CoL by Hincks 1959: 145. Stat. rev.

Alaptus extremus Soyka:?Debauche 1948 View in CoL : 55 –56 (list, key); Hincks 1959: 144 (illustration), 145 (type information, comment);? Trjapitzin 1978: 523 (key, distribution).

Type material examined. Lectotype female [ MMUE], inadvertently designated, according to Article 74.5 ( ICZN 1999), by Hincks (1959: 145) by writing that “The above specimen is the type of A. terebrans (Enock Ms.) Kryger …”, on slide ( Figs 168, 169 View FIGURES 167 – 170 ) labeled: 1. “ FRED c ENOCK PREPARER Alaptus terebrans Type ♀ ”; 2. [partially obscured by the red holotype label] “= Alaptus extremus W. D. Hincks X.1957 ”; 3. [red] “ Manchester Museum HOLOTYPE ”; 4. “N o26882 5th sp. St. Neots July 25/12 ”; 5. [on the underside] “ Alaptus fusculus Walk + Britten 1946”; 6. [a circle on the underside] “74”; 7. [F. Enock's number scratched on the glass on the underside] “26882”. The lectotype ( Fig. 171 View FIGURES 171 – 172 ) is in good condition, perfectly positioned dorsoventrally but not cleared, complete; the slide is kept in an envelope ( Fig. 167 View FIGURES 167 – 170 ).

Material examined. DENMARK: HOVEDSTADEN, Gladsakse Kommune, Kobberdammene [Forest] (near Skovbrynet), collected 28.iii.1926, emerged 12.vi.1926, O. Bakkendorf (from psocid eggs on branches of Alnus glutinosa ) [1 ♀, ZMUC] (misidentified by O. Bakkendorf as A. fusculus ). FINLAND: SOUTHERN SAVONIA: Hirvensalmi, 31.vii.1983, M. Koponen [1 ♀, FMNH]. Mikkeli, M. Koponen: 31.vii.1983 [1 ♀, FMNH]; 2.viii.1983 [1 ♀, FMNH]. Pieksänmaa, Sorsasalo, 21.vii–17.viii.2001, P. Martikainen (on aspen) [1 ♀, FMNH]. Ristiina, 4.ix.1982, M. Koponen [1 ♀, FMNH]. TAVASTIA PROPER, Loppi, 1.viii.1992, M. Koponen [2 ♀, FMNH]. UUSIMAA: Helsinki, 2.x.1985, M. Koponen [1 ♀, FMNH]. Nurmijärvi, M. Koponen: 5.viii.1986 [1 ♀, 2 ♂, FMNH]; 8.viii.1986 [3 ♀, FMNH]; Ruostesuo, 9.viii.1992 [1 ♀, FMNH]; 13.viii.1994 [2 ♀, FMNH]; 12.viii.1995 [21 ♀, FMNH]; 14.viii.1995 [3 ♀, FMNH]; 15.viii.1995 [15 ♀, FMNH]. GEORGIA: ADJARA, Batumi, Kakhaberi, Gruzbiolaboratoriya (Georgian Biological Control Laboratory), 21.viii.1953, I.A. Baranovskaya (emerged from fig twigs infested with Liparthrum colchicum Semenov ( Coleoptera : Curculionidae : Scolytinae )) [1 ♀, ZIN]. RUSSIA: KRASNODARSKIY KRAY, Krasnodar, All-Russian Research Institute of Biological Plant Protection, 23.vii.2002, V.V. Kostjukov [1 ♂, UCRC]. MOSKOVSKAYA OBLAST’: Noginskiy rayon, Fryazevo, M.E. Tretiakov: 24.vii.2000 [1 ♀, UCRC]; 25.vii.2000 [1 ♂, UCRC]; 26.vii–14.viii.2000 [4 ♀, 2 ♂, UCRC, ZIN]; 15–25.viii.2000 [1 ♀, 2 ♂, UCRC, ZIN]; 14.vii.2002 [1 ♀, UCRC]; 1.viii.2002 [2 ♀, UCRC]. Pushkinskiy rayon, Pushkino, Mamontovka, E.Ya. Shuvakhina: 20–31.vii.2000 [7 ♀, 17 ♂, UCRC, ZIN]; 1– 10.viii.2000 [2 ♀, 5 ♂, UCRC]; 10–20.viii.2000 [2 ♀, 4 ♂, UCRC]; 6–26.vi.2001 [1 ♀, 2 ♂, UCRC]. USA: FLORIDA: Sarasota Co., Oscar Scherer State Park, 27–29.v.1978, N.F. Johnson [1 ♀, CNC]. Wakulla Co., Apalachicola National Forest, 30°19.751’N 84°30.309’W, 13–20.vi.2005, F. Ronquist laboratory personnel [1 ♀, UCRC]. MICHIGAN, Clinton Co., Bath Charter Township, near Stoll Rd. and Rose Lake, 42°47’55.5’’N 84°22’50.8’’W, 259 m, T. Petrice (in canopy of Robinia pseudoacacia ): 15.ix.2015 [1 ♀, UCRC]; 8.ix.2016 [1 ♀, UCRC]. NEW YORK, Onondaga Co., Jamesville, Henneberry Rd., 42°55’00’’N 76°00’23’’W, 11–15.vii.2001, M. Wuenschel [1 ♀, UCRC]. TENNESSEE, Sevier Co., Gatlinburg, Owenby Hills, 35°44’09’’N 83°27’34’’W, 522 m, 6–26.vii.2014, A.J. Mayor [1 ♀, UCRC].

Redescription. FEMALE (lectotype). Body dark brown except mesosoma brown; appendages light brown to brown.

Antenna ( Fig. 170 View FIGURES 167 – 170 ) about as long as body; F1 as long as pedicel and F5, F2 the longest funicle segment and about 4× as long as wide, F3 shorter than F2 and slightly longer than F4, F5 the widest funicle segment; clava 3.7× as long as wide, with 4 mps, almost as long as combined length of F3–F5.

Fore wing ( Fig. 172 View FIGURES 171 – 172 ) 8.5× as long as wide; disc slightly infumate and with a complete row of 17 setae closer to anterior margin besides the admarginal rows and 2 additional setae in the widest part just behind it; longest marginal seta 3.7× maximum wing width. Hind wing ( Fig. 172 View FIGURES 171 – 172 ) about 17× as long as wide; disc strongly infumate, with 1 complete row of setae a little closer to posterior margin; longest marginal seta 7.2× maximum wing width.

Ovipositor ( Fig. 171 View FIGURES 171 – 172 ) shorter than body, markedly exserted beyond apex of gaster (by 0.33× its own total length), occupying its entire length, and 2.2× length of metatibia.

Measurements of the lectotype (µm). Body 470; head 94; mesosoma 180; gaster 224; ovipositor 379. Antenna: scape (including radicle) 51; pedicel 42; F1 42; F2 56; F3 48; F4 45; F5 42; clava 133. Fore wing 570:67; longest marginal seta 248. Hind wing 552:32; longest marginal seta 230.

Variation. Non-type specimens from Europe: body length of air-dried specimens from Finland 400–460 µm, of critical point dried specimens from Moskovskaya oblast’ of Russia ( Fig. 173 View FIGURES 173 – 176 ) 460–550 µm, and of slide-mounted specimens from Moskovskaya oblast’ 600–680 µm; ovipositor length 373–463 µm; antenna ( Fig. 175 View FIGURES 173 – 176 ) with scape (including radicle) 2.8–3.2× as long as wide, F2 4.0–5.0× as long as wide and clava 3.6–4.0× as long as wide; fore wing ( Fig. 176 View FIGURES 173 – 176 ) 8.1–9.0× as long as wide, with 15–20 setae in a complete row and 2–7 additional setae in the widest part just behind it; ovipositor ( Fig. 174 View FIGURES 173 – 176 ) shorter than body, 2.2–2.6× length of metatibia, exserted beyond gastral apex by 0.28–0.35× its own total length. Non-type specimens from the USA (only tentatively identified as A. terebrans as they have a relatively longer ovipositor; otherwise, they could rather belong to A. klonx if its ovipositor length can vary that much): body length of the dry-mounted specimen from Tennessee prior to slidemounting 495 µm, and that of other, slide-mounted specimens 550–580 µm; ovipositor length 482–533 µm; scape (including radicle) 2.9–3.3× as long as wide, F2 4.5–5.0× as long as wide, clava 3.6–3.8× as long as wide, as long as combined length of F4, F5, and about half length of F3 or a little more; fore wing 7.8–8.7× as long as wide, with 15–17 setae in a complete row and 0 or 1 additional setae in the widest part just behind it, longest marginal seta 3.0–3.3× maximum wing width; hind wing 15–17× as long as wide; ovipositor a little shorter than body, 2.8–3.0× length of metatibia, exserted beyond gastral apex by 0.32–0.35× its own total length.

Description. MALE (non-type specimens from Russia). Body length of critical point dried specimens about 430 µm and of slide-mounted specimens 600–650 µm. Similar to female except for normal sexually dimorphic features of antenna and genitalia and the following. Head dark brown to black, rest of body brown to dark brown. Antenna ( Fig. 177 View FIGURES 177 – 179 ) with scape 2.7–3.3× as long as wide, Fl slightly longer than pedicel and the shortest flagellar segment, F2 usually at least a little longer than scape but sometimes about as long as scape; fore wing ( Fig. 178 View FIGURES 177 – 179 ) 7.4–8.8× as long as wide (length 600–650 µm), with 2–10 additional setae in the widest part of disc just behind the complete row of setae. Genitalia ( Fig. 179 View FIGURES 177 – 179 ) length 58–75 µm.

Diagnosis. Alaptus terebrans is similar to A. fusculus in most aspects, from which it differs by a much longer ovipositor, which is strongly exserted beyond the gastral apex (by 0.28–0.35× its own total length, the ovipositor is 2.2–2.6× as long as metatibia in the European specimens) whereas in A. fusculus the ovipositor is at most a little exserted beyond the gastral apex (by at most 0.17× its own length, the ovipositor is at most 1.8× as long as metatibia). The ovipositor in A. terebrans is at least 370 µm long whereas in A. fusculus including all its synonyms it is at most 320 µm long. Also, both sexes of A. terebrans , at least in Europe, almost always have several additional setae in the widest part of the fore wing disc just below the complete row of setae that A. fusculus almost always lacks, at least in females (males of A. fusculus very rarely may have just one additional seta).

Distribution. Nearctic: USA * (tentative, see above); Palaearctic: Denmark ( Bakkendorf 1934 [as A. fusculus ]; Kryger 1950), Finland *, Georgia *, Russia *, and UK ( England).

Hosts. Unknown. Bakkendorf (1934) reared it in Denmark from psocid eggs deposited as dark crusts on branches of Alnus glutinosa .

Comments. Having examined many slide-mounted specimens of both A. fusculus and A. terebrans , I have had more or less no problem separating their males in Europe based on body size and fore wing length and chaetotaxy: the latter species definitely has relatively more numerous setae on the disc, particularly having a few additional setae behind the complete row of setae.