Forum Entomologi Italiani

Salve! Misura circa 5 mm. sembrerebbe un Lixino pelosetto,

Microlarinus cf. lareynii

Grazie Aleksei, buona giornata

Molto simile al M. lypriformis, a parte l'edeago, quali possono essere i caratteri che differenziano le due specie????

1 – Erect setae on elytra and pronotum clearly longer that the width of an elytral interval.. . . . . . . . . . . . .2
1’ – Erect setae on elytra and pronotum not or slightly longer than the width of an elytral interval. Prothorax barely narrower than elytra (figs 7 and 8). On Tetraena fontanesii (Webb. & Berthel.) Beyer & Thulin (Zygophyllaceae). Length: 3.5-4.0 mm. Canary Islands. . . . . . . . . . . . . . . . . . . . . . . .eliasenae Marshall
2 – Erect setae on elytral intervals not arranged in rows. On Tribulus pentandrus Forsk. (Zygophyllaceae). United Arab Emirates. Length: 3.9-4.5 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .irregularis Colonnelli
2’ – Erect setae on elytral intervals at least in part arranged in rows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3 – Size not exceeding 2.7 mm. United Arab Emirates. Length: 2.2-2.7 mm. . . . . . . . . . minimus Colonnelli
3’ – Size above 3 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4 – Body elongate, elytra subcylindrical and barely less than twice as long as wide. Pronotum hardly narrower than elytra. Erect setae on elytra and pronotum just a little longer that the width of an elytral interval. On Tribulus terrestris L. and T. cistoides L. (Zygophyllaceae). Europe, Africa, India, introduced in north, central and south America, Hawaii and Papua New Guinea. Length: 3.0-4.2 mm . lypriformis (Wollaston)
4’ – Body plumper, elytra with somewhat rounded sides at least on posterior third and at most 1.8 times as long as wide. Erect setae on elytra and pronotum clearly longer that the width of an elytral interval. . . . .. .5
5 – Rostrum subquadrate, not or barely longer than wide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5’ – Rostrum more or less tapering towards apex, usually clearly longer than wide. . .. . . . . . . . . . . . . . . . . . .7
6 – Lateral pale stripe of pronotum and elytra formed by bifid hair-like scales. Tanzania. Length: 3.5-3.7 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . masaicus Voss
6’ – Lateral pale stripe of pronotum and elytra formed by simple hair-like scales. South Africa, Mozambique, Zimbabwe, Malawi, Ethiopia. Length: 3.5-4.0 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . brevirostris Marshall
7 – Erect setae on elytra and pronotum at least as long as three times the width of an elytral interval. Rostrum more than 1.5 times as long as wide in males and around twice so in females. South Africa, Namibia, Zambia (fig. 12). Length: 3.4-4.0 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pilosus (Gyllenhal)
7’ – Erect setae on elytra and pronotum about twice as long as the width of an elytral interval. Rostrum less than 1.5 times as long as wide in both sexes. On Tribulus terrestris L. (Zygophyllaceae). Europe, North Africa, western and central Asia, India, introduced in North America and Hawaii. Length: 3.0-4.0 mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . rhinocylloides Hochhuth

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Thank you Leonardo (and Enzo of course) !!!
A new and simple identification key at last, after this (a bit problematic) of Petri -1907.
But where is M. lareynii in this key ?? It is in synonymy to another species ???

G

Grazie Leonardo, buona serata

Colonnelli,2018

"........Accordingly, it is here pointed out again that M. rhinocylloides Hochhuth, 1847 is the same as M. lareynii Jacquelin du Val, 1853. Since Alonso-Zarazaga et al. (2017) set up the synonymy between M. lareynii and M. diecki, the following new synonymy must also be established: M. rhinocylloides Hochhuth, 1847 [= M. diecki Faust, 1890; n. syn.]."

Therefore....

Microlarinus rhinocylloides Hochhuth, 1847 = M. lareynii Jacquelin du Val, 1853 = M. diecki Faust, 1890.

In my opinion, this is: Microlarinus lypriformis (Wollaston)

_________________
"Stay hungry, stay foolish".
Steve Jobs, 2005
___________________
jjuniper8(at)gmail.com
Twitter: @weevil_forbix
cell. 339/5275910
___________________

Thank you again Leonardo !!!
So, only 2 species in continental Europe, M. lypriformis and M. rhinocylloides.
But here, in my opinion, this is probably the second of them, M. rhinocylloides.