almost circular, longer than claws (Fig.
Dryinus of the constans group (group 1 of Olmi and Virla, 2014), comprises about 40 species, 12 from Brazil and it is characterized by the notaulice at least partly visible and enlarged claw, much longer than arolium
, with one subapical tooth and never with a broad apical lamella (Olmi et al.
texana durante el vuelo nupcial, gracias al arolium
de gran tamano que poseen en sus patas (BROSSUT, 1976).
In his book The Semiaquatic Bugs, Andersen (1982) established the phylogeny of Gerromorpha, and diagnosed the clade on presence of three pairs of cephalic trichobothria inserted in deep cuticular pits; quadrangular mandibular levers; pretarsi with one dorsal and one ventral arolium
, and the female genital tract with a gynatrial complex, including a long tubular spermatheca and a secondary fecundation canal.
Insects' foot pad which includes arolium
, palmula and euplantula is an important organ for them to adhere to the slippery surface (CHEN, 2007).
Legs: legs I and II with an oblique junction between femur and patella; legs III and IV without tactile setae on tibiae or tarsi; metatarsus and tarsus fused into single segment (tarsus); tarsi with single raised slit sensillum; subterminal tarsal seta curved and acuminate; tarsal claws simple; arolium
slightly shorter than claws.
Se utilizo la bandeja ya que estos insectos presentan unos pequenos arolium
tarsales los cuales se adhieren a la superficie, evitando su desplazamienlo (Mound y Marullo 1996; Steiner y Goodwin 1998).
Generally speaking, each of the first 4 tarsomeres may bear on its ventral surface a single, colorless pad-like enlargement called the tarsal pulvillus, and there is a soft adhesive lobe called the arolium
at the apex of the fifth tarsomere.
1), tarsus three-segmented on all pairs of legs; pretarsus of foreleg with large, membranous ventral arolium
, and a slightly sclerotized lobe in dorsal position that may represent the dorsal arolium
very large, slightly shorter than basal part of segment 5 of fore tarsus (8:10).
Pseudalbiorix can be further separated from the other recognized genera of Ideoroncidae as follows: from the American genus Albiorix by the lack of a divided arolium
; from the American genus Ideoroncus by the presence of 4 setae on the anterior margin of the carapace (6 setae in Ideoroncus) and the position of trichobothrium st which is situated slightly ventral to the level of sb in Ideoroncus but is not ventrally displaced in Pseudalbiorix (or any other ideoroncid); from the American genus Typhloroncus by the long arolium
, the presence of eyes and by the slightly lower number of trichobothria (30 in Pseudalbiorix and 32 or 33 in Typhloroncus); from the Asian genera Dhanus, Shravana and Nhatrangia and the African genus Negroroncus by the absence of a lamina exterior [except in D.
Sharov (1968, 1971) argues that the five-segmented tarsus provided with an arolium
which he describes for [dagger]perfecta (fig.