1.62 Mo

ACAROLOGIA
A quarterly journal of acarology, since 1959
Publishing on all aspects of the Acari
All information:
http://www1.montpellier.inra.fr/CBGP/acarologia/
[email protected]
Acarologia is proudly non-profit,
with no page charges and free open access
Please help us maintain this system by
encouraging your institutes to subscribe to the print version of the journal
and by sending us your high quality research on the Acari.
Subscriptions: Year 2017 (Volume 57): 360 €
http://www1.montpellier.inra.fr/CBGP/acarologia/subscribe.php
Previous volumes (2010-2015): 250 € / year (4 issues)
Acarologia, CBGP, CS 30016, 34988 MONTFERRIER-sur-LEZ Cedex, France
The digitalization of Acarologia papers prior to 2000 was supported by Agropolis Fondation under
the reference ID 1500-024 through the « Investissements d’avenir » programme
(Labex Agro: ANR-10-LABX-0001-01)
Acarologia is under free license and distributed under the terms of the
Creative Commons-BY-NC-ND which permits unrestricted non-commercial use, distribution, and
reproduction in any medium, provided the original author and source are credited.
NOTULAE ORIBATOLOGICAE XVI. CARABODES GRANDJEAN!,
A NEW SPECIES FROM CHIANTI (ACARIDA, ORIBATEI)
BY
F. BERNIN!
Istituto di Zoologia dell'Università di Siena, Italia
During my studies on Italian Carabodes I have found an interesting new species of such
genus in the surroundings of Siena.
Carabodes grandjeani n. sp.
DESCRIPTION.
Measurements, colour, cerotegument and citticle. The single specimen found, a female, is 380 µ
long and 205 µ wide ; its general aspect is that of the species belonging to the " minusculus "
group (BERNIN!, r976).
The colour is pale brown.
The cerotegument layer is transparent, very much like that described in other species of the
same genus (BERNIN!, r975, r976).
The cuticle microsculpture in certain ways recalls that of C. poggii Bernini as the posterior
part of the prodorsum surface exhibits cristae which are mostly transversal. Near the rostrum
the interlamellar space becomes progressively narrower and is filled with partially fused cristae
forming a sort of irregular network (Figs. 2, 4) ; the whole surface of the prodorsum, lamellae
included, is thickly punctuated (Fig. 2).
The notogaster is of the usual kind seen in the " minusculits " group, that is : large, fiat
well defined tubercles are loosely ranged to leave large empty spaces (Figs. 2, 4). They are never
fused, not even along the postero-lateral dorsal border. The superficial microsculpture of the
humeral projections differs from that of the rest of the notogaster ; it exhibits two large radial
cristae and a few shallow areolae (Fig. 4).
In the ventral region the epimeral zone exhibits loosely ranged areolae whilst in the anogenital region it presents cristae sometimes fused to form a reticulum (Fig. r). The cuticle of
the anal and genital plates, and also that of the mentum surface present tiny areolae. The
same type of microsculpture covers also the lateral region of the podosome (Fig. 3).
Acarologia, t. XIX, fasc. r, 1977.
-
r45 -
50µ
FIG. 1-3. -
Carabodes grandjeani n. sp.
Ventral (r), dorsal (2) and lateral (3) view of the body without the legs .
Acarologia, t. XI X, fasc.
1,
1977.
IO
Prodorsum. The rostrum is roundish (Figs. 4, 5) ; the rostral setae which rise in front of
the lamellar apex are smooth and bent towards one another; the lamellae are rather large and
slightly convergent. A thin translamella is visible (Figs. 2, 4) never before described in other
Carabodes species, in particular in the " minuscitlus " group. The strong slightly bent lamellar
setae are long enough to cross each other on the sagittal plane (Figs. 2, 4, 5). A well defined
cervical cavity which is missing in the species of the " min?,tscitlits " group separates the prodorsum from the notogastral shield; it is divided into three alveoli (Figs. 2, 4), the central one being
much larger than the other two. This cavity is anteriorly limited by a bulky protusion devoid
of the central groove typical of other Carabodes species. From the apex of each of the two partitions in the cervical cavity arise two long robust smooth interlamellar setae with a longitudinal
groove very much like that seen in C. poggii (Figs. 2, 4).
The aspect of the pseudostigmata is the same as in other species of the Carabodes genus.
The sensillus bears a long slender stem with a head morphologically like that of the entities of
the "1ninuscitlus" group (Figs. 2, 3, 4). The ex setae are missing.
Lateral characters. The profile of the camerostome is not indented. The tutorium located
beneath the lamella has the shape of a long sclerous crest (Fig. 3). The structure of pedotecta I
and II is the same as in C. poggii. The discidial projection is robust.
4
/)·~
// u
:")~
50µ
50µ
FrG. 4-6. -
Carabodes grandjeani n. sp.
4) Prodorsum and anterior part of the notogaster showing' setae and notogastral microsculpture ;
5) Frontal view of the rostrum; 6) Posterior end of ventral plate.
-
147 -
Notogaster. In relation to the dimension of the prodorsum the notogaster of C. grandjeani
1s rather small (Fig. 2). A well defined band surrounds the whole lateral-posterior border of
the notogaster. There are ro pair of notogastral setae. As to shape the centrodorsal setae
are like those of C. poggii but at least three times longer, and thicker in proportion. Their finely
indented lateral border stands out in relief. The marginal setae are thick but short and slightly
bent. The notogastral lyrifissures are normal in number and position but difficult to detect.
Ventral characters. The epimeral formula seems to be 2-1-3-2; setae Ic and 4c are apparently
missing. The epimeral grooves and sternal cavities are not very deep. The genital plates bear
4 pair of setae each, and the anal plates only two. A pair of aggenital setae and 3 pair of adanal
setae complete the ventral chaetotaxy ; all the setae are short smooth and erect. The iad fissure
is to be seen leaning against the lateral border of the anal opening. All the other ventral characters
are the same as those of the species of the " minitscitlits " group.
Gnathosoma. This part of the body is normal. The palpus presents the same reduced chaetotactic formula seen in the species of the" min1,t scitlits" group (0-2-1-3-8) plus the big solenidium w
(BERNIN!, 1975).
Legs. The tarsi are monodactyle. The morphology and chaetotactic formulas of the
setae and solenidia are the same as those described for C. niinitscitlits (BERNIN!, 1976).
LOCALITY DATA.
The only specimen was found at Barbaione (Pianella in Chianti) near Siena on l\farch 2nd,
1976 on lichens and little twigs lying on the ground.
The holotypits is in my collection at the Institute of Zoology of the University of Siena.
DERIVATIO NOMINIS.
The new species is named after the late French Acarologist François Grandjean.
COMPARATIVE CHARACTERS AND OBSERVATIONS.
As described above, the aspect of C. grandjeani shows marked morphological affi.nities with
the species of the " minitscitlus " group : the same shape, colour, notogastral microsculpture
and morphology of the sensillus. Also the prodorsal and ventral microsculptures are similar
to those of C. poggii. Nevertheless differentiating characters are noticeable : C. grandjeani
exhibits a clearly visible thin translamella and also a large cervical cavity between the prodorsum
and the notogaster. The length of the notogastral setae is also different, but this character
seems to me of less importance considering that an increase in the size of the notogastral setae
may be observed even in the" minusculits " group, or even within one same species (C. willmanni
Bernini, for instance). As to the other differentiating characters mentioned above it should be
borne in mind that even the posterior border of the prodorsum of C. poggii is slightly concave;
there seems to be a gradation in the manifestation of this character suffi.cient to demonstrate that
C. grandjeani effectively belongs to the " minusrnlus " group. The presence of the translamella,
which is an unusual character in the whole Carabodes genus, seems however to deny this statement. A more precise systematic position of C. grandjeani will be possible only after having
revised the whole Carabodes genus.
SUMMARY
Carabodes grandjeani, a new species similar but not belonging to the "minusculus" group is described.
RÉSUMÉ
L'Auteur décrit dans ce travail une espèce nouvelle d'Oribate appartenant au genre Carabodes,
C. grandjeani, et récoltée dans les lichens crustacés sur les bois au sol, aux environs de Sienne. Cette
forme est voisine systématiquement des espèces du groupe « minuscitlits n, mais elle en diffère par la
présence d'une cavité cervicale large et d'une translamelle faible.
REFERENCES
BERNINI (F.), 1975· - Notulae Oribatologicae XII. Una nuova specie di Carabodes affine a C. milmsculits
Berlese 1923 (Acarida, Oribatei) . - Redia, 56 : 455-471.
BERNINI (F.), 1976. - Notulae Oribatologicae XIV. Revisione di Carabodes minusculus Berlese, 1923
(Acarida, Oribatei) . - Redia, 59 : l-49.
Paru en Septembre r977.