There are a few taxa in the desert SW US that apparently do not feed as adults, and possess reduced/vestigial mouthparts, e.g. Acoma and the Podolasiini.  There are similar taxa in similar ecological areas in southern South America.





From: Scarab Beetle Taxonomy Discussion List <[log in to unmask]> On Behalf Of Alberto Ballerio
Sent: Saturday, March 14, 2020 11:12 AM
To: [log in to unmask]
Subject: Re: Non-feeding adults in Scarabaeoidea


Hello Dirk,

as far as I know, among European Rhizotrogini there are some Amphimallon which do not feed as adults.

A reference is below:

Nonveiller G., 1960. – Probavni i ekskretorni organi malih gundelja sa opisom
regresivnih procesa u njihovoj grad

i kod nekih afagnih vrsta (tribus Rhizotrogini,
fam. Scarabaeidae, Coleoptera) [Der Bau der Verdauungs und Exkretionsorgane
der Rhizotrogini sowie Beschreibung der bei einigen aphagen Arten festgestellten
regressiven Prozessen (tribe Rhizotrogini, fam. Scarabaeidae, Coleoptera)]. Zbornik
radova Poljoprivrednog fakulteta [Review of Research work at the Faculty of
Agriculture], Zemun, 8 (297): 1-20. (In Serbo-Croatian, German summary).

Best regards,



Il 14/03/2020 18:52, Dirk Ahrens ha scritto:

Hi All,

in a work in preparation we would like to give in a few sentences a short review on non-feeding scarab adults.

Could you guys give us a help to make this thing more complete?

There are in literature some vague statements such as this of Ritcher (1958) and Scholtz (1990) about nonfeeding Rutelinae and Dynastinae, for which I could find so far no precise data on taxa and references. Maybe I have overlooked other references…


In order to avoid notification already known to us, I attached below the list I could make so far…


Thanks to all in advance who may help!





ps. Do we have this pattern (i.e., nonfeeding of adult specimens) also among dung beetle lineages (Aphodiinae/ Scarabaeinae)?



Non-feeding in Scarabaeoidea


·      Diphyllostoma (Lucanidae; nonfunctional mandibles; maxillae with a small rounded galea; Nel & Scholtz 1990)

·      Amphicoma, Lichnanthe (Glaphyridae; Ritcher 1958; Sabatinelli et al. 2020)

·      Pleocoma (Pleocomidae; Ritcher 1958; nonfunctional mandibles; maxillae with a small rounded galea; Nel & Scholtz 1990

·      Pachypus (Pachypodiini; Crovetti 1968)

·      Ceramida (Tanyproctini; very simple and reduced mouthparts; Sanmartin & Martin-Piera 2000; some more candidates with reduced epipharynx: Alaia, Atanyproctus, and Otoclinius)

·      Aclopus (Aclopinae; reduced galea, simple epipharynx; Nel & Scholtz 1990)

·      Xenaclopus (Melolonthinae, s.l. (Ocampo & Vaz de Mello 2008): reduced galea, simple epipharynx; Nel & Scholtz 1990)

·      Scapanoclypeus ("Tanyproctini" (see Eberle et al. 2018); epipharynx reduced, galea, lacinia, ligula absent; Nel & Scholtz 1990)

·      Sebaris, Pseudachloa, Eucyclophylla (Melolonthinae, s.l.; galea oval with setae; group 4 and 5; Nel & Scholtz 1990)

·      "There are species in each of the subfamilies Melolonthinae, Rutelinae, and Dynastinae which do not feed at all in the adult stage" (without specifications; Ritcher 1958, Scholtz 1990)

Dr. Alberto Ballerio
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I-25123 Brescia
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