Blommers, L.

Chazeau, Jean

Horizon / Pleins textes

Two new species of predator mites of the genus AmbZyseitcs 
Berlese (Acarina : Phytoseiidae) from Madagascar1 
By LEO BLOMMERS~ and JEAN cHAZEAU3 
/
With 14 figures 
Abstract 
The predator mites Amblyseiris masiaka and A.  vazimba are described, and compared with 
related A. stolidus Chaudri and A .  neolargoensis v. d. Merwe, respectively. 
Amblyseius masiaka sp. n. 
A.  masiaka is closely related to A.  stolidus Chaudri, 1968 from Pakistan. 
Specimens of the latter were not deposited in the British Museum as stated 
with the description, and we could not obtain either the type, or other speci- 
mens from Pakistan. Descriptions of the males and females as presented in 
this paper show slight differences with the descriptions of A.  stolidus and the 
female of A.  masiaka and we prefer to consider A.  masiaka a new species. 
The main differences are the number (four instead of five) and the 
relative size of the teeth on the fixed digit of the chelicera, and the shape 
of the cervix base. 
I 
Female 
Dorsal face. Dorsal shield well sclerotized, smooth, with 17 pairs of setae: 
seven dorsocentrals (jl, j3, j4, j5, j6,,J2, J5), five mediolaterals (24, 25, 21, 
This study was carried out as a part of NUFFIC-project GUA-4, in collaboration with 
Laboratory of Experimental Entomology, University of Amsterdam, Holland. 
Laboratory of Applied Zoology, ORSTOM, P.B. 434, Tananarive, Madagascar. 
ORSTOM (Centre Tananarive). 
2. ang. Ent. 75 (1974), 308-315 
@ 1974 Verlag Paul Parey, Hamburg und Berlin 
ISSN 0044-2240 I ASTM-Coden: ZANEAE 
T w o  n e w  species of predator mites of the genus Amblyseius Bertese 309 
Figs. 1-5. Amblyseius masiaka sp. n. 9, $. 1 = dorsum, 0 ;  2 = chelicera, $; 3 = cheli- 
cera, 0 ;  4 = ventri-anal scutum, $ ; 5 = venter, 9 
310 L. Blommevs and J .  Chazeau 
24, 25), five laterals (s2, s4, S2, S4, S5). Two pairs of setae on the interscutal 
membrane (sublaterals r2 and Rl). All setae short and smooth, except 2 4  
and 25. The latter longer, stronger and slightly serrated, 20 pairs of pores 
and solenostomes. 
Ventral face. Sternal shield posteriorly emarginated, Ventrianal shield 
almost pentagonal, and lightly striated, with three pairs of preanal setae, one 
pair of paranals, one postanal and a pair of punctiform solenostomes. Inter- 
scuta1 membrane with four pairs of setae, five pairs of pores and two pairs 
of metapodal platelets. 
Legs. Chaetotaxy of leg IV normal: genu with seven setae, tibia six setae, 
basitarsus three setae and one macroseta, tarsi twelve setae. 
Chelicera. Fixed digit provided with four subapical teeth and a pilus 
dentilis, movable digit with one taoth. 
Spermatheca. Major duct thin walled, long and wide. Atrium short and 
broad. Cervix long, thick walled and cylindrical, gradually diverging to- 
wards the vesicle. Minor duct very thin and difficult to see. 
Dimensions (in microns). Maximum length dorsal shield: 355; max. 
width: 210. - J5 = 12, j l  = j3 = j4 = j5 = j6 = 25 = s2 = 16-18; r2 = 
R1 = 18; 24 = s4, = J2 5 20; 21 = S2 = S4 = S5 5 22; 24  = 40; 2 5  
= 55. -Median ldligth of sternal shield: 70. - Max. length ventrianal shield: 
125; max. width: 110. - Preanals: 20; paranals: 12; postanal: 18. Macroseta 
leg IV: 62. - Length fixed digit of chelicera: 29; length movable digit: 3 3 .  - 
Spermatheca: length major duct 35, width 3-4; length atrium 4, width 4; 
length cervix 28, max. width 8, min. width 4. 
Male 
Dorsal face. Dorsal shield much like that of the female, but proportionally 
wider and bearing the sublateral setae. All setae smaller than those of the 
female. A huge solenostome near S4. 
Ventral face. Sternal shield normal, with five pairs of setae and four 
pairs of pores or solenostomes. Ventrianal shield almost triangular and fused 
anteriorly with the peritremal shield. Slightly reticulated and with four 
pairs of preanal setae, one pair of paranals, one postanal and four pairs of 
pores or solenostomes. Interscutal membrane with one pair of setae and one 
pair of pores. 
Chelicera. Shorter and weaker than that of the female. Fixed digit with 
three subapical teeth and a pilus dentilis. Movable digit with one tooth and 
a T-shaped spermatophoral process. 
Dimensions. Max. ldngth dorsal shield: 280; max. width: 195. - J5 = 10; 
. R1 = 15; s4 = S2 = S4 = 18; 2 4  = 30; 25 = 35. -Median length sternal 
shield: 125. - Max. length ventrianal shield: 120; max. width: 145. - 
Preanals: 20; paranals: 10; postanal: 12. Macroseta leg IV: 60. - Length 
fixed digit of chelicera: 24; length movable digit: 24. - Spermatophoral pro- 
cess: major portion 15, branch 30. 
Specimens studied 
Female holotype collected in April 1971 from a mass rearing with Tetrany- 
&;fis neocaledonictts André as prey. This mass rearing was started with speci- 
j l  = j4 = j5 25 ~ ' 1 2 ;  j3 j6 = 24 = s2 = J2 = 21 S5 = r2 = 
T w o  n e w  species of predator mites of the  gentds Amblyseilts Berlese 31 1 
Figs. 6-7. Amblyseius inasiaka sp. n. 6 = leg IV, 2; 7 = spermatheca. 
Figs. 8-10. Anzblyseius vazimba sp. n. 8 = spermatheca; 9 = dorsum, Ç?; 10 = chelicera, 9 
312 L. Blommers and J .  Chazeau 
mens collected on 9 and 10 March, 1971 from Gossypium hirstttum and 
Leonotis nepetaefolia at the I.R.C.T. experimental station in Tuléar. Para- 
types: 8 females and 6 males from the same rearing (L. BLOMMERS). 
Holotype deposited in the National Museum of Natural History in Paris: 
paratypes in both the Paris Museum and the Institute for Taxonomic Zool- 
ogy of the University of Amsterdam, Holland. 
Four females and four males from Majunga-Katsepy, on Phaseoltss sp. 
27-IV-1972 (L. BLOMMERS). 
Amblyseius vazimba sp. n. 
A.  vazimba resembles A.  neolargoensis v. d. Merwe 1965. 
It differs from this species by the presence of four teeth on the movable 
digit, and twelve on the fixed digit of the chelicera of the female, against 
three and eleven respectively. The cervix of the spermatheca is more funnel 
shaped. As shown in Figure 11 genu IV, tibia IV and basitarsus IV each bear 
one additional seta. 
Female 
Dorsal face. Dorsal shield smooth. Location of muscle attachment well 
marked. 17 pairs of setae: seven dorsocentrals, five mediolaterals and five 
laterals. Two pairs of sublaterals on the interscutal membrane. The shield 
with at least 24 pairs of pores or solenostomes. 
Sternal face. Sternal shield with three pairs of setae. A fourth pair on the 
metasternal platelets. Anterior margin convex, posterior margin almost 
straight. Genital shield normal. 
Ventrianal shield longer than wide. Its margins nearly parallel, with (the 
type) or without a constriction in the region of the preanal pores. 
Three pairs of preanal setae, one pair of paranals, and one postanal. 
Interscutal membrane with four pairs of setae, two pairs of metapodal 
platelets, and four pairs of pores. 
Legs, Genu IV with a very long tapering macroseta and six short setae, 
tiba IV with a long macroseta and five short setae, basitarsus with a mod- 
erately long macroseta and three short setae. Leg III with three macrosetae; 
legg II with two (genu and basitarsus); leg I with one (genu). 
Chelicera. Fixed digit with two subapical teeth and ten rather large, 
blunt teeth in a row. Movable digit with four small teeth; three of them 
grouped together. : 
Spermatheca. Major duct poorly sclerotized and broad. Atrium thick 
walled and disklike. Cervix long and narrow; its diameter increasing at least 
2 times from atrium to vesicle. 
Dimensions. Max. length dorsal shield: 370; max. width: 250. - j4 = j5 
24 = 25 = 5-6; j6 = J5 = 21 = s2 = R1 = 7-8; J2 = S2 = S4 = S5 
= r2 = 9-11; j l  = 40; j3 = 52; s4 =140; 2 4  175; 2 5  = 340. -Median 
length sternal shield: 75. - 
Max. length ventrianal shield: 110; max. width: 75. - Preanals: 17-21; 
paranals: 18; postanal: 20. Ventrocaudal setae: 25. - Macroseta leg IV: genu 
185; tibia 115; basitarsus 80, -Length fixed digit: 30; length movable digit: 
Two n e w  species of predator mites of the  genus Amblyseius Berlese 313 
O 
O 
Figs. 13-14. Amblyseiws vazimba sp. n. 0, $. 11 = leg IV, 0 ;  12 = ventri-anal 
scutum, 8 ; 13 = chelicera, 8 ; 14 = venter, 9 
314 L. Blommers a n d  J .  Chazeau 
30. - Spermatheca: length major duct 25, width 5; length atrium 3, width 6; 
length cervix 32, max. width 4, min. width 2. 
Male 
Dorsal face. Dorsal face of the male identical with that of the female, except 
all dimensions being smaller. 
Ventral face. Sternal shield normal. Triangular venthanal shield lightly 
reticulated anteriorly and fused with the peritremal shield. Three pairs of 
preanals, one pair of paranals, and one postanal. Four pairs of pores. Inter- 
scuta1 membrane with two pairs of pores and a single pair of setae. 
Legs. Macrosetae as with the female, but smaller. 
Chelicera. Fixed digit with two subapical teeth and seven in a row. 
Dimensions. Max. length dorsal shield: 280; max. width: 200. - j l  = 30; 
, j3 = 48; s4 = 100; 24 = 125; 25  = 255; remaining dorsal setae less than 
10. - Median length sternalshield: 140. - Max. length ventrianal shield: 
130; max. width: 140. - Preanals: 16-18; paranals: 17; postanal: 15. - 
Macrosetae leg IV: genu 130; tibia 90; basitarsus 75. - Length fixed digit: 
25; length movable digit: 25. - Spermatophoral process: major portion 17; 
branch 8. 
Specimens studied 
Female holotype taken in April 1971 from a mass rearing with T .  neocde- 
donicus as host. This mass rearing was started with Phytoseiid mites collected 
on 8 and 9 March, 1971 on Lantana camard, Lagerstroemid indica and Aca- 
lypha sp. in the Agricultural Station in Tuléar. On close examination, this 
rearing appeared to contain two similar species, of which only A. vazimba 
in the long run survived. 
Paratypes: all taken from the same mass rearing as the holotype: 8 fe- 
males on 6-X-1972, 10 females and 6 males on 27-X-1972, 17 females on 
17-XI-1972 (L. BLOMMERS). 
Holotype deposited in the Paris Museum. Paratypes in both the Paris and 
Amsterdam Museum. 
Movable digit with a single tooth and L-shaped spermatophoral process. 
Remarks 
MUMA and DENMARK (1971) consider A. neolargoensis v. d. Merwe a synonym of A. lar- 
goensis Muma 1955 (nec Muma 1961). We were not able to verify this. But A. largoensis 
Muma 1955 (sensu Ehara 1959) differs definitely from A. neolargoensis. Therefore, we 
prefer to preserve the latter name for the species described by VAN DER MERWE, until 
further study proves otherwise. 
Zusammenfassung 
Zwei  neue Arten der Rartbmilbengattung Amblyseius Berlese (Acar. Phytos.) 
aus Madagaskar 
Die beiden Raubmilben-Arten Amblyseius masiaka n. sp. und A. vazimba n. sp. werden 
neu beschrieben und mit den verwandten Arten A. stolidtes Chaudri und A. neolargoensis 
v. d. Merwe verglichen. 
References 
CHAUDHRI, W. M., 196s: Six new species of mites of the genus Amblyseius (Phytoseiidae) 
from Pakistan. Acarologia 10, 550-562. 
! 
Two new species of predator mites of the  genus Amblyseius Berlese 315 
EHARA, S., 1959: Some predatory mites of the genera Typklodromus and Amblyseius from 
MUMA, M. H., 1955: Phytoseiidae (Acarina) associated with citrus in Florida. Ann. Ent. 
- 1961 : Subfamilies, genera and species of Phytoseiidae (Acarina, Mesostigmata). Bull. 
- DENMARK, H. A., 1970: Phytoseiidae of Florida. Arthropods of Florida, Vol. 6. Fla. 
VAN DER MERWE, G. G., 1965: South African Phytoseiidae (Acarina). I, Nine new species 
I Japan (Phytoseiidae). Acarologia 1, 285-295. 
Soc. Am. 48, 262-272. 
Fla. State Mus. 5, 267-302. 
Dept. Agric. Cons. Serv., Gainsville, Florida, USA. 
of the genus Amblyreius Berlese. J. Ent. Soc. Sth. Afr. 28, 57-76. 
1 
S,onderdrrtck a m  Bd.  75 (1974), H. 3, S. 308-315 
Zeitschrift für angewandte Entomologie 
V E R L A G  P A U L  P A R E Y  * 2 H A M B U R G  1 . S P I T A L E R S T R A S S E  1 2  
Alle Rechte, auch die der Ubersetzung, des Nachdrucks, der photomechanischen Wiedergabe und Speicherung 
in Datenverarbeitungsanlagen, vorbehalten. @ 1974 Verlag Paul Parey, Hamburg und Berlin 


Two new species of predator mites of the genus Amblyseius Berlese (Acarina : Phytoseiidae) from Madagascar

Abstract

Similar works

Full text

Available Versions

Horizon / Pleins textes