t
Alycidae Canestrini & Fanzago 1877 (=Pachygnathidae Kramer 1877, Bimichaeliidae Womersley 1944Womersley 1944:
Womersley H. 1944. Australian Acarina, families Alycidae and Nanorchestidae. Transactions of the Royal Society of South Australia 68: 133–143.)
Petralycus Grandjean, 1943Grandjean, 1943:
Grandjean F. 1943. Queques genres d’Acariens appartenant au groupe des Endeostigmata, 2e Série. Deuxiéme partie. Annales des Sciences Naturelles, Zoologie 11 (ser. 5): 1–59.: 1–59
Petralycus unicornis Grandjean, 1943—Europe
Superorder Acariformes » Order Sarcoptiformes » Suborder Endeostigmata » Infraorder Bimichaliida » Superfamily Alycoidea » Family Alycidae » Genus Petralycus
Petralycus longicornis Theron, 1977—acacia soil in South Africa; Petralycus brevicornis Theron, 1977—pasture soil in South Africa; Petralycus caryapecaus McDaniel & Bolen; Petralycus celtisacinus McDaniel & Bolen
Prodorsumprodorsum:
the dorsal surface of the propodosoma.
with of 2 pairs of trichobothriatrichobothrium:
(pl. trichobothria) (= bothridial sensillum) an often elaborately modified seta set in a cup-like base; forms include filiform, ciliate, pectinate or variously thickened or clubbed (bat-like to globose or capitate).
, posteriorposterior:
the back part of the body or towards that region in comparison, e.g., 'posterior to'.
pair (si) filiformfiliform:
thread-like; long and narrow.
, anterioranterior:
the front part of the body or towards that region in comparison, e.g., 'anterior to'.
pair (ve) globoseglobose:
spherical.
to capitatecapitate:
with a terminal knob or head-like swelling; clavate; globose.; other prodorsal setaeseta:
(pl. setae, from L. = bristle) cuticular process composed of a hollow shaft (sometimes filled with a refractive material) produced from a membranous socket (the alveolus); the hair-like, spine-like, branched or variously expanded structures on the surfaces of the legs and body. Most setae function as mechanoreceptors, but others (e.g., solenidia) are chemoreceptors or have unknown or ambiguous functions.
reduced to 2–3 pairs of setaeseta:
(pl. setae, from L. = bristle) cuticular process composed of a hollow shaft (sometimes filled with a refractive material) produced from a membranous socket (the alveolus); the hair-like, spine-like, branched or variously expanded structures on the surfaces of the legs and body. Most setae function as mechanoreceptors, but others (e.g., solenidia) are chemoreceptors or have unknown or ambiguous functions. (exp absent; in, se present or absent); naso produced as spine-likespine-like:
a seta or other structure that resembles a thorn or spine; spiniform. process; eyes usually absent. Chelicerae chelate-dentatechelate-dentate:
pincer-like chelicerae with teeth.
, each with 0–1 setaseta:
(pl. setae, from L. = bristle) cuticular process composed of a hollow shaft (sometimes filled with a refractive material) produced from a membranous socket (the alveolus); the hair-like, spine-like, branched or variously expanded structures on the surfaces of the legs and body. Most setae function as mechanoreceptors, but others (e.g., solenidia) are chemoreceptors or have unknown or ambiguous functions.; rutellarutellum:
(pl. rutella) In Sarcoptiformes, the hypertrophied setae on the hypostome, often toothed; not to be confused with a corniculus (although possibly a homologue). In Astigmata, the rutellum may be referred to as a pseudorutellum, although it is the same structure. Various forms of rutella are recognized, including the atelebasic and pantelebasic.
with teeth and usually a spine. Opisthosomaopisthosoma:
(= abdomen) the posterior body division in arachnids; usually not distinct in mites because of the fusion of the opisthosoma with part of the prosoma to form the idiosoma.
hypertrichous or holotrichous; 3 pairs of genital papillaegenital papillae:
1-3 pairs of extrusible finger-like to button-like projections, usually retracted into in the genital vestibule of acariform mites; sometimes formed as sessile disks around the genital opening; thought to be osmoregulatory structures; modified or multiplied and dispersed over the body in many freshwater mites. Genital papillae are absent in the larva, but may be added ontogenetically: protonymphs have one pair, deutonymphs two pairs, and tritonymphs (and adults) three pairs. The tritonymphal pair of papillae is often lost. The serially homologous Claparède's organ is usually present in the larvae (and prelarvae) of mites exhibiting genital papillae in nymphs and adults (Oudeman's Rule).
.
Members of the genus Petralycus are distinctive because of their acuminateacuminate:
coming to a point., tubercle-like naso and the capitatecapitate:
with a terminal knob or head-like swelling; clavate; globose. form of the anterioranterior:
the front part of the body or towards that region in comparison, e.g., 'anterior to'.
pair of bothridial sensillasensillum:
(pl. sensilla) (also sensillae; 'sensillus' is incorrect) a sensory structure; sensilla is often used for the bothridial seta in Acariformes.
(ve). Species of Bimichaelia also have a capitate sensillumsensillum:
(pl. sensilla) (also sensillae; 'sensillus' is incorrect) a sensory structure; sensilla is often used for the bothridial seta in Acariformes., but it is the posteriorposterior:
the back part of the body or towards that region in comparison, e.g., 'posterior to'.
pair (si), and they lack a naso, but retain the median eye.
Author: David E. Walter
Content last updated Sept. 2006, unless indicated otherwise
Lucid key player updated Sept. 2025
idtools.org
