Lohmannia vulcania

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Lohmannia vulcania
Systematics
Class : Arachnida
Superordinate : Acariformes
Order : Sarcoptiformes
Subordination : Horn mites (Oribatida)
Family : Lohmanniidae
Type : Lohmannia vulcania
Scientific name
Lohmannia vulcania
Schatz , 1993

The horn mite Lohmannia vulcania belongs to the subclass of the mites (Acari) and to the family of the Lohmanniidae . This species was discovered and described in the Galápagos Islands . Currently, their distribution of this species is only known from the Galápagos Archipelago . Lohmannia vulcania occurs mainly in damp / wet decomposed litter.

morphology

With 1035–1125 µm × 450–500 µm, Lohmannia vulcania is one of the largest species in the genus Lohmannia . The surface of the adult specimen has a light to medium brown color. In the adult stage , Lohmannia vulcania differs from its conspecifics in the following features: body surface evenly granulated, the posterior exobothridial setae extremely dilated and wider than long, almost round, transverse ligaments on the Notogaster poorly developed, ligaments s3 - s8 medially interrupted, prodorsalsetae, all 16 Notogastersetae as well as most of the Ventralsetae leaf-shaped with serrated edges, setae ps1 and ps2 strongly broadened at the end of the body.

The known young stages ( protonymph : 510 × 239 µm, deutonymph: 614 × 297 µm, tritonymph: 711 × 324 µm) are slightly yellowish or white with a finely granulated surface, all Notogastral and most ventral bristles are leaf-shaped with jagged edges , Setae ps1 in the deuto- and tritonymphs broadened.

relationship

Lohmannia vulcania belongs to the genus Lohmannia . Lohmannia vulcania is morphologically similar in many aspects to the species Lohmannia jornoti Mahunka, 1985. Both species have a sensillus with 12 side branches and transverse ligaments on the Notogaster that are not fused together. Furthermore, both species have leaf-shaped setae with jagged edges on the prodorsum and notogaster. The main differences between the two species lie in the size and structure of the setae. Lohmannia jornoti is smaller than Lohmannia vulcania . There is also a difference in the shape of the setae of the legs in the youth stage. In contrast to almost all other species of the genus, Lohmannia vulcania has extremely widened posterior exobothridial bristles. Similar broadened bristles are only found in Lohmannia banksi Norton, Metz & Sharma, 1978, which differ from Lohmannia vulcania in other features .

distribution

Lohmannia vulcania was found on four islands of the Galápagos Archipelago ( Floreana , Pinzón , Santa Cruz , Isabela - Sierra Negra volcano). The species lives mainly in damp decomposed syphoid grasses and mosses, but also in damp decomposed leaf or wood litter. The size of the populations on the various islands differs slightly (Santa Cruz: 1110 × 490 µm, Pinzón: 1068 × 475, Floreana: 1090 × 480 µm, Isabela - Sierra Negra volcano: 1072 × 480 µm).

swell

  • Mahunka, S. (1985) New and Interesting Mites from the Geneva Museum LVII. Oribatida Americana 9: Antilles I (Acari). Revue suisse de Zoologie 92: 119–144.
  • Norton, RA, Metz LJ & Sharma GD (1978): Some Lohmanniidae (Acarina: Oribatei) from North and South Carolina forest soils. Journal of the Georgia Entomological Society 13 (1): 15-24.

Individual evidence

  1. a b c d Schatz, H. (1993) The Genus Lohmannia (Acari: Oribatida: Lohmanniidae) on the Galápagos Islands. Acarologia 34 (1) :, 70-83

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