SEM of Zercon triangularis, copyright Zsolt Ujvári.

Belongs within: Gamasina.

The Zerconidae is a family of predatory mites known only from the Northern Hemisphere in habitats such as humus, litter, mosses and animal nests (Lindquist et al. 2009).

Characters (from Lindquist et al. 2009): Female, male and deutonymph with podonotal and opisthonotal shields well developed, rarely secondarily united; those of adult ornamented and extended laterally so as to bear marginal setae along their usually serrated margins; opisthonotal shield of deutonymph and adult fused caudally with ventrianal shield and often with transverse row of four (sometimes three or two) clearly defined fossae near posterior margin. Male without cheliceral sperm-transferring appendages. Palptarsal apotele two-tined. Tritosternum with well-developed laciniae. Male genital opening between coxae II-III; female epigynal shield with one pair of setae, not flanked by setae in soft integument; female and male with broad ventrianal shield; peritremes well developed in deutonymph, often short in adult but rarely reduced to size of stigmata. Genu III and IV each with ten setae, including two posterolaterals on genu III ( 2 2/1, 2/1 2) and one posteroventral on genu IV (2 2/1, 3/1 1).

<==Zerconidae JM91
    |--Aspar anisotrichus KA90
    |--Bakeras JM91
    |--Bledas JM91
    |--Caurozercon duplex KA90
    |--Cosmozercon JM91
    |--Krantzas JM91
    |--Lindquistas JM91
    |--Macrozercon praecipuus KA90
    |--Microzercon JM91
    |--Mixozercon stellifer KA90
    |--Syskenozercon JM91
    |--Monozercon JM91
    |--Paleozercon cavernicolus LKW09
    |--Halozercon LKW09
    |--Echinozercon LKW09
    |--Amerozercon Halašková 1969 KA90
    |    `--A. suspiciosus KA90
    |--Parazercon Trägårdh 1931 S61
    |    |--P. radiatus (Berlese 1914) SK91
    |    `--P. sarekensis S61
    |--Skeironozercon Halašková 1977 KA90
    |    |--S. embersoni KA90
    |    `--S. tricasus LKW09
    |--Prozercon Sellnick 1943 S61
    |    |--P. fimbriatus S61
    |    |--P. kochi Sellnick 1943 SK91
    |    |--P. traegardhi S61
    |    `--P. willmanni Schweizer 1948 [incl. P. kochi var. pluripennatus Sellnick 1944] S61
    `--Zercon JM91
         |--Z. arcuatus S61
         |--Z. badensis S61
         |--Z. bicornis S22
         |--Z. colligans Berlese 1920 S61
         |--Z. dampfi S61
         |--Z. diessenhofeneri Schweizer 1961 S61
         |--Z. echinatus Schweizer 1922 S61 [=Z. triangularis var. echinatus S22]
         |--Z. franzi Willmann 1943 S61
         |--Z. helveticus Schweizer 1961 S61
         |--Z. italicus S61
         |--Z. jurassicus Schweizer 1961 S61
         |--Z. keiseri Schweizer 1949 S61
         |--Z. lischani Schweizer 1961 S61
         |--Z. montanus Willmann 1943 S61
         |--Z. nivalis Schweizer 1961 S61
         |--Z. ornatus S22
         |--Z. perforatulus Berlese 1904 S61
         |--Z. romagnicolus Sellnick 1944 S61
         |--Z. sarasinorum Schweizer 1949 S61
         |--Z. schweizeri S61
         |--Z. sellnicki (Schweizer 1948) [=Parazercon sellnicki] S61
         |--Z. suecicus Sellnick 1944 S61
         |--Z. triangularis Koch 1836 SK91 (see below for synonymy)
         |--Z. trigonus S22
         |--Z. zangheri S61
         `--Z. zelawaiensis JM91

Zercon triangularis Koch 1836 SK91 [=Gamasus triangularis CF77; incl. Z. triangularis var. caudatus S22, *Z. dimidiatus Koch 1839 S61, G. serratus CF77]

*Type species of generic name indicated


[CF77] Canestrini, G. & F. Fanzago. 1877. Intorno agli Acari Italiani. Atti del Reale Istituto Veneto di Scienze, Lettere ed Arti, Serie 5, 4: 69-208, pls 202-207.

[JM91] Johnston, D. E., & M. L. Moraza. 1991. The idiosomal adenotaxy and poroidotaxy of Zerconidae (Mesostigmata: Zerconina). In Dusbábek, F. & V. Bukva (eds) Modern Acarology: Proceedings of the VIII International Congress of Acarology, held in České Budĕjovice, Czechoslovakia, 6–11 August 1990 vol. 2 pp. 349-356. SPB Academic Publishing: The Hague.

[KA90] Krantz, G. W., & B. D. Ainscough. 1990. Acarina: Mesostigmata (Gamasida). In: Dindal, D. L. (ed.) Soil Biology Guide pp. 583-665. John Wiley & Sones: New York.

[LKW09] Lindquist, E. E., G. W. Krantz & D. E. Walter. 2009. Order Mesostigmata. In: Krantz, G. W. & D. E. Walter (eds) A Manual of Acarology, 3rd ed., pp. 124-232. Texas Tech University Press.

[S22] Schweizer, J. 1922. Beitrag zur Kenntnis der terrestrischen Milbenfauna der Schweiz. Verhandl. Naturf. Ges. Basel 33: 23-112, 4 pls.

[S61] Schweizer, J. 1961. Die Landmilben der Schweiz (Mittelland, Jura und Alpen): Parasitiformes Reuter, mit 246 Arten und Varietäten und 268 meist kombinierten Originalzeichnungen. Denkschriften der Schweizerischen Naturforschenden Gesellschaft [Mémoires de la Société Helvétique des Sciences Naturelles] 84: i-vii, 1-207.

[SK91] Sylwestrowicz, Z. A., & D. B. Kostecka. 1991. Oribatei and Mesostigmata of pine forests from Poland. In Dusbábek, F. & V. Bukva (eds) Modern Acarology: Proceedings of the VIII International Congress of Acarology, held in České Budĕjovice, Czechoslovakia, 6–11 August 1990 vol. 1 pp. 365-371. SPB Academic Publishing: The Hague.

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