Trigynaspida

Micromegistus sp., photographed by S. E. Thorpe.


Belongs within: Parasitiformes.
Contains: Celaenopsoidea.

The Trigynaspida are a group of large mesostigmatan mites that are primarily associated with arthropods or reptiles, either as commensals or parasites (Lindquist et al. 2009b).

Characters (from Lindquist et al. 2009b): Movable cheliceral digit with medial or terminal dendritic, brushlike, or filamentous ventral excrescences. Oviporus usually covered by two latigynal and one mesogynal shields that may be variously coalesced or reduced; median element (mesogynal shield) nude, subtriangular by often reduced of insensibly fused to other elements; latigynal shields each with one to many setae, free or fused posteriorly to ventral elements and/or medially to each other. Femur IV with 4-11 setae. Tarsus IV usually with setae av4 and pv4 present in adults and deutonymphs (usually on free intercalary sclerite in adult).

<==Trigynaspida [Trigynaspides]
    |  i. s.: Paradiplogynium S01
    |         Diplogyniella S01
    |--Cercomegistoidea [Cercomegistina] LKW09b
    |    |--Seiodes [Seiodidae] LKW09b
    |    |--Pyrosejus [Pyrosejidae] LKW09b
    |    |--Asternoseius [Asternoseiidae] LKW09b
    |    |    `--A. ciliatus LKW09b
    |    |--Saltiseius [Saltiseiidae] LKW09b
    |    |    `--S. hunteri Walker 2000 LKW09b
    |    |--Cercomegistidae LKW09b
    |    |    |--Cercomegistus evonicus LKW09b
    |    |    `--Vitzthumegistus LKW09b
    |    `--Davacaridae LKW09b
    |         |--Davacarus reginaldi LKW09b
    |         `--Acanthodavacarus klompeni LKW09b
    `--Antennophorina KA90
         |--Celaenopsoidea KA90
         |--Antennophorus WP99 [Antennophoridae, Antennophoroidea KA90]
         |    `--A. grandis K09
         |--Megisthanoidea LKW09b
         |    |--Sternosternum [incl. Hoplomegistus; Hoplomegistidae] LKW09b
         |    `--Megisthanus [Megisthanidae] S01
         |         `--M. floridanus OW01
         |--Aenictequoidea LKW09a
         |    |--Aenicteques [Aenictequidae] LKW09b
         |    |    `--A. chapmani LKW09b
         |    |--Physalozercon [Physalozerconidae] LKW09b
         |    |    `--P. raffrayi LKW09b
         |    |--Ptochacarus [Ptochacaridae] LKW09b
         |    |    `--P. silvestri LKW09b
         |    `--Messoracaridae LKW09b
         |         |--Messoracarus mirandus LKW09b
         |         `--Leptantennus LKW09b
         |--Fedrizzioidea [Fedrizziina] LKW09b
         |    |--Klinckowstroemiidae LKW09b
         |    |    |--Klinckowstroemia LKW09b
         |    |    |--Klinckowstroemiella LKW09b
         |    |    |--Antennurella LKW09b
         |    |    `--Simantennurella LKW09b
         |    `--Fedrizziidae S01
         |         |--Fedrizzia S01
         |         |--Parafedrizzia S09
         |         `--Neofedrizzia Womersley 1959 S09
         |              |--*N. gayi Womersley 1959 S09
         |              |--N. camini LKW09b
         |              |--N. jeffi Seeman 2009 S09
         |              |--N. susanae Seeman 2009 S09
         |              `--N. vitzthumi LKW09b
         `--Parantennuloidea LKW09b
              |--Philodana [Philodanidae] LKW09b
              |    `--P. johnstoni LKW09b
              |--Promegistus [Promegistidae] LKW09b
              |    `--P. armstrongi LKW09b
              |--Parantennulidae LKW09b
              |    |--Micromegistus bakeri K09
              |    |--Parantennulus LKW09b
              |    `--Diplopodophilus LKW09b
              `--Paramegistidae LKW09b
                   |--Ophiomegistus WP99
                   |--Echinomegistus wheeleri K09
                   |--Antennogistus LKW09b
                   |--Paramegistus LKW09b
                   |--Meristomegistus LKW09b
                   `--Neomegistus LKW09b

*Type species of generic name indicated

REFERENCES

[K09] Krantz, G. W. 2009. Habits and habitats. In: Krantz, G. W. & D. E. Walter (eds) A Manual of Acarology, 3rd ed., pp. 64-82. Texas Tech University Press.

[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.

[LKW09a] Lindquist, E. E., G. W. Krantz & D. E. Walter. 2009a. Classification. In: Krantz, G. W. & D. E. Walter (eds) A Manual of Acarology, 3rd ed., pp. 97-103. Texas Tech University Press.

[LKW09b] Lindquist, E. E., G. W. Krantz & D. E. Walter. 2009b. Order Mesostigmata. In: Krantz, G. W. & D. E. Walter (eds) A Manual of Acarology, 3rd ed., pp. 124-232. Texas Tech University Press.

[OW01] Otto, J. C., & K. J. Wilson. 2001. Assessment of the usefulness of ribosomal 18S and mitochondrial COI sequences in Prostigmata phylogeny. In Acarology: Proceedings of the 10th International Congress (R. B. Halliday, D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff, eds) pp. 100-109. CSIRO Publishing: Melbourne.

[S01] Seeman, O. 2001. Myriad Mesostigmata associated with log-inhabiting arthropods. In Acarology: Proceedings of the 10th International Congress (R. B. Halliday, D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff, eds) pp. 272-276. CSIRO Publishing: Melbourne.

[S09] Seeman, O. D. 2009. Two new species of Fedrizziidae (Acari: Mesostigmata) from Australian passalid beetles (Coleoptera: Passalidae). Systematic and Applied Acarology 14: 51-59.

[WP99] Walter, D. E. & H. C. Proctor. 1999. Mites: Ecology, Evolution and Behaviour. CABI Publishing: Wallingford (UK).

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