12 research outputs found
FIGURES 33–39 in Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas
No full textFIGURES 33–39. Petrobia (P.) carthagensis sp. nov., female. 33, tarsus and tibia I; 34, tarsus and tibia II; 35, empodia I–IV; 36, palptarsus; 37, spermatheca; 38, terminal anastomosis of peritreme; 39, genital area.Published as part of Auger, Philippe, Chaaban, Samah Ben, Grissa, Kaouthar Lebdi, Khoualdia, Othman & Flechtmann, Carlos H. W., 2009, Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas, pp. 29-49 in Zootaxa 2232 on page 39, DOI: 10.5281/zenodo.19032
Bryobia alveolata Auger, Chaaban, Grissa, Khoualdia & Flechtmann, 2009, sp. nov.
No full textBryobia alveolata sp. nov. Auger & Flechtmann (Figures 1–13) Type-specimens. Holotype (female), 4 female paratypes on 5 microscopic preparations from Atriplex sp., (Chenopodiaceae), M'Rha Lahouara, Gouvernorat de Tozeur, Tunisia, 05/06/ 2005, coll. P. Auger. Holotype and 3 female paratypes deposited in the collection of the Centre de Biologie et de Gestion des Populations (CBGP), 34988 Montferrier-sur-Lez, France. One female paratype deposited in the type collection of the Muséum national d’Histoire naturelle, Paris (MNHN). Diagnosis. This species is distinctive from other members of the genus by the presence on its opisthosoma of seven more or less large oval-shaped depressions or dimples with rounded reticulations. Description. Female : Holotype 654 µm long (excluding gnathosoma) gnathosoma 196 µm long (measured to the tip of palps), width 396 µm. Four paratypes measured, 552–622 µm long, gnathosoma 185– 208 µm long, width 370–390 µm. Dorsum – Prodorsum with four pairs of setae and with quite well developed lobes. Outer propodosomal lobes less developed than inner lobes and more or less triangular with broad bases. Incision between the outer and anteromedian lobes wide and not deep; incision between median lobes also relatively shallow. A horizontal line joining tip of v 2 setae crosses the bases of v 1 setae. Dorsal body setae palmate, serrate and subequal in length (length of holotype and variations of four paratypes): v 1 24 (22–24); v 2 27 (26–28); sc 1 26 (25– 26); sc 2 23 (20–23); c 1 27 (21–24); c 2 25 (23–24); c 3 23 (23–26); d 1 26 (22–26); d 2 23 (22–26); d 3 22 (19–23); e 1 26 (22–25); e 2 23 (22–25); e 3 21 (21–22); f 1 23 (23–27); f 2 23 (21–23); h 1 21 (21–23). Distance between bases of d 1 and e 1 about two-thirds that between c 1 and d 1. Propodosoma covered with rough elongate reticulate elements medially and more or less rounded elements laterally. Opisthosoma bears folds with a pattern mostly transverse and arched posteriorly to d 1 setae. Seven large oval-shaped dimple-like depressions with rounded reticulations present. With 12 pairs of setae. Gnathosoma – Stylophore rounded, longer than wide. Tibial claw of palpus bidentate. Palptarsus elongate and bears seven setae and a solenidion. Peritreme anastomosed distally in a relatively long and slender enlargement. Venter – Area immediately anterior to genital flap irregularly longitudinal. Sacculus of spermatheca circular. Three anal and two para-anal setae are present. Legs – Length inferior to body length, leg I 553 (486–520) µm long (length of holotype and variations of two paratypes). Leg chaetotaxy as follows: I 2 − 1 −14 − 6 − 13 + (1) − 18 + (6) [(5)] + 2 duplexes; II 1 − 1 − 9 − 5 − 9 − 13 + (4) + 1 duplex; III 1 − 1 − 7 − 6 − 9 − 13 + 1 duplex; IV 1 − 1 − 4 − 7 − 9 − 14 + (1). Tarsus III associated setae serrate and approximate with solenidion, about equal in size; tarsus IV with solenidion well-separated from tactile, proximal, and about half length of tactile seta. True claws uncinate, with one pair of tenent hairs (leg I) or two pairs of tenent hairs (legs II, III, IV). Empodial pads each bears two rows of tenent hairs and almost as long as claws. Male: Unknown FIGURES 1, 2. Bryobia alveolata sp. nov., female. 1, dorsal aspect; 2, dorsal sc 1 seta. Etymology. The species alveolata is named after the oval shaped depressions with rounded reticulations present on the dorsal part of the hysterosoma.Published as part of Auger, Philippe, Chaaban, Samah Ben, Grissa, Kaouthar Lebdi, Khoualdia, Othman & Flechtmann, Carlos H. W., 2009, Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas, pp. 29-49 in Zootaxa 2232 on pages 30-32, DOI: 10.5281/zenodo.19032
Biology and life-table of Typhlodromus (Anthoseius) athenas (Acari: Phytoseiidae) fed with the Old World Date Mite, Oligonychus afrasiaticus (Acari: Tetranychidae)
No full textThe old world date mite Oligonychus afrasiaticus is an important spider mite pest of the date palms Phoenix dactylifera L. mostly in North Africa and the Middle East. A population of the predaceous mite Typhlodromus (Anthoseius) athenas has been recently found in Tunisia in association with a decrease of O. afrasiaticus densities. The objective of this paper was to assess the development and reproduction abilities of T. ( A.) athenas on O. afrasiaticus under laboratory conditions at two temperatures: 27 and 32 °C. The results obtained show that females of T. (A.) athenas develop in 5 days at 27 °C and 4.1 days at 32 °C. The mean fecundity of T. (A.) athenas was 32.1 and 23.2 eggs per female at 27 and 32 °C, respectively. Life table parameters were stimated: the net reproductive rate (Ro) 27.9 and 17.9 eggs/female, the intrinsic rate of increase (rm) 0.322 and 0,344 female/female/day and the mean generation time (T) 10.3 and 8.4 days at 27 and 32 °C, respectively. At both temperatures tested, T. (A.) athenas intrinsic rate of increase was greater than that of O. afrasiaticus (rm = 0.213 at 32 °C,against rm = 0.166 day1 at 27 °C). Typhlodromus (A.) athenas would be able to develop at a wide range of temperatures feeding on O. afrasiaticus and seems to be able to potentially control it
Petrobia (Petrobia) carthagensis Auger, Chaaban, Grissa, Khoualdia & Flechtmann, 2009, sp. nov.
No full textPetrobia (Petrobia) carthagensis sp. nov. Auger & Flechtmann (Figures 24–39) Type-specimens. Holotype (male), 11 male and 11 female paratypes on Salicornia arabica L., 1753, (Chenopodiaceae), El Hamma, Gouvernorat de Tozeur, Tunisia, 05/06/ 2005, coll. P. Auger. All the material on 22 microscopic preparations. Holotype, 8 male and 8 female paratypes deposited in the collection of the CBGP. Remaining paratypes deposited in the type collection of the MNHN. Diagnosis. Petrobia (P.) carthagensis resembles P. (P.) b re v i p e s Reck and Bagdasarian in that it bears a similar dorsohysterosomal striation pattern and short subspatulate setae but it is distinctive in having different leg setae formula. FIGURES 24, 25. Petrobia (P.) carthagensis sp. nov., female. 24, dorsal aspect; 25, dorsal h 1 seta (enlarged). Description. Male : Holotype 284 µm long (without gnathosoma), gnathosoma 102 µm long. Ten paratypes measured, 260–318 µm long, gnathosoma 95–109 µm long. Dorsum – Dorsal body setae slender and serrate, fourth pair of lateral setae and clunals being longer than other setae (length of holotype and variations of ten paratypes): v 2 16 (13–15); sc 1 12 (11–13); sc 2 11 (11–14); c 1 12 (11–13); c 2 11 (10–12); c 3 12 (11–15); d 1 11 (11–12); d 2 11 (10–11); e 1 12 (10–12); e 2 11 (10–11); f 1 13 (11–14); f 2 19 (17–19); h 1 16 (16–19). There are no lobes on striation. Gnathosoma – Peritreme anastomosed distally but distal enlargement smaller compared to female. Palpal claw not accute, slightly truncate distally. Palptarsus eupathidium su longer than eupathidia ul', ul'' and solenidion. FIGURES 26–32. Petrobia (P.) carthagensis sp. nov., male. 26, tarsus and tibia I; 27, tarsus and tibia II; 28, empodia I– IV; 29, peritremal anastomosis; 30, palptarsus; 31, h 1 setae; 32, aedeagus. Venter – Ventral striae without lobes. Legs – Legs length inferior to the body, leg I 230 (212–230) µm long (length of holotype and variations of ten paratypes). Leg chaetotaxy as follows: I 2 − 1 − 4 − 5 − 5 + (3) + 4 duplexes − 9 + (2) [(3)] + 4 [3] duplexes; II 2 − 1 − 3 − 5 − 5 − 10 + (1) + 1 duplex; III 1 − 1 − 2 − 3 − 3 − 9 + (1) + 1 duplex; IV 1 − 1 − 2 − 3 − 3 − 9 + (1) + 1 duplex. Duplex tactile setae on tarsi III and IV not serrate and about one fourth the length of solenidia. Empodia I– IV bear true claws pad-like, about half the length of empodial claws bearing two raws of ventrally directed hairs Aedeagus – Shaft long, 105 (94–105) µm long, slender and abruptly constricted towards its distal end forming a slender stylet about one fourth to one fifth as long as the whole shaft. Female: 11 females measured. Idiosoma: length 347–421 µm long, gnathosoma 119–133 µm long, width 258–284 µm. Dorsum – Dorsal body setae short, subequal in length, serrate and subspatulate. As in male, external sacrals and clunals longer and more spatulate than other dorsal hysterosomal setae: v 2 15–17; sc 1 11–15; sc 2 11–13; c 1 11–13; c 2 10–11; c 3 10–11; d 1 9–11; d 2 9–11; e 1 8 –10; e 2 9 –10; f 1 9–12; f 2 12–17; h 1 12–15. Prodorsal integument with irregular reticulum medially. Laterally, prodorsum with irregular broken longitudinal striation. Hysterosomal striation with irregular widely spaced furrows. Medially, hysterosoma with transverse striae except in the area immediatly above the third pair of dorsocentral setae. Lateral striation broadly longitudinal with transverse patterns near d 2 setae insertion and above e 2 setae insertion. Caudal part of hysterosoma with smooth punctuations in an arched array. There are no lobes on stiation. Gnathosoma – Stylophore rounded; peritreme ends in anastomosing chambers. Palptarsus as in male. Venter – Area immediatly anterior to genital flap with irregular striation. Two pairs of para-anal setae and three pairs of anal setae are present. Spermatheca – Sacculus elongate, constricted medially and bulbous distally. Legs – Legs length strongly inferior to body length, leg I 217–253 µm long. Leg chaetotaxy as follows: I 2 − 1 −3 [4] − 5 − 9 + (1) − 11 [10] + 2 duplexes; II 2 − 1 − 3 − 5 − 5 − 10 [9] + 1 duplex; III 1 − 1 − 2 − 3 − 3 − 9 + 1 duplex; IV 1 − 1 − 2 − 3 − 3 − 9 + 1 duplex. Associated setae on tarsi III and IV serrate and about two-thirds as long as solenidia. Empodia I–IV with true claws pad-like, about the half the length of empodial claws bearing two raws of ventrally directed hairs. Etymology. The species designation, carthagensis, refers to the antique capital in present-day Tunisia, the country where the mites were collected.Published as part of Auger, Philippe, Chaaban, Samah Ben, Grissa, Kaouthar Lebdi, Khoualdia, Othman & Flechtmann, Carlos H. W., 2009, Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas, pp. 29-49 in Zootaxa 2232 on pages 36-40, DOI: 10.5281/zenodo.19032
Tetranychus (Tetranychus) atriplexi Auger, Chaaban, Grissa, Khoualdia & Flechtmann, 2009, sp. nov.
No full textTetranychus (Tetranychus) atriplexi sp. nov. Auger & Flechtmann (Figures 57–72) Type-specimens. Holotype (male), 6 male and 7 female paratypes on 14 preparations from Atriplex sp., (Chenopodiaceae), El Hamma du Jerid, Gouvernorat de Tozeur, Tunisia, 05/06/ 2005, coll. P. Auger. Holotype, 4 male and 5 female paratypes deposited in the collection of the CBGP; 2 males and 2 females deposited in the type collection of the MNHN. Diagnosis. This species is a Tetranychus sensu stricto assigned into the eighth group as defined by Flechtmann and Knihinicki (2002). Among members of Tetranychus (T.) from this group (female tarsus I with proximal pair of duplex setae distad of tactile setae; female empodium with dorsomedian spur tiny or absent), this species is distinctive by the shape of the aedeagus. The aedeagus of T. atriplexi resembles that of Tetranychus urticae Koch but the aeadeagus knob axis forms an acute angle with the axis of the shaft and its posterior projection is more differentiated from the anterior because of its duck-beak like extension. Moreover, male empodia shape combination is also unusual in this group. Description. Male : Holotype 356 µm long (without gnathosoma), gnathosoma 153 µm long. Five paratypes measured, 353–384 µm long, gnathosoma 139–150 µm long. Dorsum – Dorsal body setae long, linear lanceolate, well surpassing in length distance between consecutive bases (length of holotype and variations of six paratypes): v 2 72 (68–76); sc 1 146 (126–139); sc 2 95 (90–91); c 1 122 (105–125); c 2 116 (108–113); c 3 108 (98–109); d 1 123 (86–118); d 2 119 (106–113); e 1 109 (99–110); e 2 105 (101–104); f 1 76 (72–78); f 2 71 (64–68); h 1 36 (35–39). There are no lobes on the dorsal striation. Gnathosoma – Palptarsus terminal sensillum twice as long as broad. Peritreme hooked distally. Venter – Ventral striae without lobe. Legs – Empodium I bifid each side composed of two short digits, ventral pair being stronger. It also bears a strong mediodorsal spur about two-third the length of the apppendages. Empodium II also bifid with each side strongly tridigitate and carying a strong spur. Empodia III–IV with dorsal spurs less prominent and with three pairs of proximoventral hairs. Leg chaetotaxy as follows: I 2 − 1 −10 − 5 − 9 + (4) − 13 + (3) + 2 duplexes; II 2 − 1 − 6 − 5 − 7 − 13 [12] + (1) + 1 duplex; III 1 − 1 − 4 − 4 − 6 − 9 + (1); IV 1 − 1 − 4 − 4 − 7 − 10 + (1). Aedeagus – Aedeagal shaft bends dorsad at nearly a right angle. Knob of the aedeagus about two times the width of the stem. Its axis forms an acute angle with the axis of the shaft. Knob assymetrical with an anterior rounded projection and a more developped acute posterior projection more or less duck-beak shaped. Dorsal margin of the knob slightly convex. A small depression is present between the dorsal margin and the begining of the posterior projection. Female: 6 females measured. Idiosoma: length 525–590 µm, gnathosoma 174–190 µm long, width 337– 414 µm. Dorsum – Dorsal body setae lanceolate, longer than distances between bases of consecutive setae (variations of 6 paratypes): v 2 102–111; sc 1 179–196; sc 2 130–143; c 1 170–192; c 2 172–185; c 3 153–178; d 1 154–176; d 2 169–184; e 1 158–175; e 2 150–175; f 1 138–156; f 2 126–144; h 1 58–72. Hysterosomal striation transverse except between the bases of setae e 1 and f 1 (longitudinal) forming a diamond-shaped pattern between these setae. Dorsal hysterosomal striae with lobes mostly rounded but irregular in size and shape. Prodorsal lobes as tall as broad medially, lobes up to two times wider as tall laterally near sc 1 insertions. Hysterosomal lobes mostly rounded and broader than tall near setae insertions. A few triangular lobes are also present, mixed or not with rounded lobes. They are numerous in the middle of the diamond pattern but a few are also present in different parts of the hysterosoma. Gnathosoma – Palpus with a spinneret about one and a half as long as broad. Peritreme hooked distally. Venter – The area immediatly anterior to genital flap seems to be uniform without any punctuation. In fact, very small points longitudinaly distributed are also present in the middle part of this area. Genital flap with transverse slightly arched striae. Lobes on striation only present in the caudal part laterally. One pair of para-anal and two pairs of anal setae are present. Legs – Empodia I–IV bear three pairs of proximoventral hairs and no spur was observed. Leg chaetotaxy as follows: I 2 − 1 −10 − 5 − 9 + (1) − 13 + (1) + 2 duplexes; II 2 − 1 − 6 − 5 − 7 − 13 + (1) + 1 duplex; III 1 − 1 − 4 − 4 − 6 − 9 + (1); IV 1 − 1 − 4 − 4 − 7 − 10 + (1). Tarsus I with four tactile setae proximal to proximal duplex setae. Solenidion is at or near the level of the proximal duplex. Other Material – 2 males and 7 females on 8 microscopic preparations collected on Limonium sp. (Plumbaginaceae), Checkmo, Gouvernorat de Tozeur, Tunisia, 05/06/ 2005, coll. P. Auger Etymology. The species designation, atriplexi, derives from the generic name of the host plant on which the mites were collected. Biological observations. Adults of this species are dark red in colour. This species also produces quite abundant webbing.Published as part of Auger, Philippe, Chaaban, Samah Ben, Grissa, Kaouthar Lebdi, Khoualdia, Othman & Flechtmann, Carlos H. W., 2009, Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas, pp. 29-49 in Zootaxa 2232 on pages 45-48, DOI: 10.5281/zenodo.19032
Petrobia (Petrobia) pseudotetranychina Auger, Chaaban, Grissa, Khoualdia & Flechtmann, 2009, sp. nov.
No full textPetrobia (Petrobia) pseudotetranychina sp. nov. Auger & Flechtmann (Figures 40–56) The sub-genus assignation of the species described below was quite problematic. One of its morphological characteristics is the presence of obvious bulges on sacral (f) and clunal (h) setae insertions. According to diagnostic features, Wainstein (1960) has proposed to divide the genus Petrobia into three sub-genera. The sub-genus Tetranychina Banks can be separated from the two others by the presence of dorsal setae set on tubercles. In addition to the absence of tubercles on the dorsum, the two remaining sub-genera, Petrobia (sensu stricto) and Mesotetranychus Reck, are segregated by the presence of anastomosing and simple peritremes respectively. Nevertheless the word "tubercle" may be unclear. The diagnose of Tetranychina by Meyer (1974) increases the confusion because members of Tetranychina may be recognised by "[...] hysterosomal setae located on prominent tubercles or else only some dorsal setae on the opisthosoma may be set on tubercles". Does tubercle refer to a simple obvious bulge of the integument or to a large protuberance? Depending on the species the answer is sometimes evident but sometimes difficult. One species, P. (P) phaceliae Tuttle and Baker, 1964, illustrates this dilemma. In their original description of this species the authors mentioned "dorsal body setae [...] not set on tubercles". In their drawing of the mite in habitus we can see that all dorsal body setae are inserted on small but obvious bulges blister-like. Later, in their "Guide to the spider mites of the United States ", the same authors mentioned in the description of this species that the dorsal body setae were inserted on small tubercles. Moreover they provided a key in which they separate P. (P.) latens from P. (P.) phaceliae by a combination of characters including the presence of some setae set on tubercles in the latter species (Baker & Tuttle 1994). Nevertheless they kept this species assigned to the subgenus Petrobia s. str. Observations of P. (P.) latens dorsum under microscope reveal that in the caudal area slightly swollen setae insertions can be observed. As in the species we collected in Tunisia the tubercles are smaller than those present in the dorsum of P. (P.) phaceliae, we decided to assign this new species to the subgenus Petrobia s. str. FIGURES 40, 41. Petrobia (P.) pseudotetranychina sp. nov., female. 40, dorsal aspect; 41, f 2 seta. Type-specimens. Holotype (male), 4 male, 6 female paratypes on 11 microscopic preparations from Atriplex sp., (Chenopodiaceae), El Hamma, Gouvernorat de Tozeur, Tunisia, 05/06/ 2005, coll. P. Auger. Holotype, 5 female and 3 male paratypes deposited in the collection of the CBGP. 1 male and 2 female paratypes deposited in the type collection of the MNHN. Diagnosis. The female of Petrobia (P.) pseudotetranychina resembles Petrobia (P.) latens but it can be easily distinguished by the combination of the presence of conspicuous bulges on sacral (f) and clunal (h) setae insertions and by the size of these setae which are longer than the other dorsal hysterosomals. Moreover, in P. (P.) pseudotetranychina, the medio dorsal hysterosomal striation is entirely transverse. These two species also differ in their leg chaetotaxy. Description. Male : Holotype 367 µm long (excluding gnathosoma), gnathosoma 119 µm long. Four paratypes measured, 354–379 µm long, gnathosoma 90–125 µm long. Dorsum – Dorsal body setae narrowly lanceolate and serate, not subspatulate as in females but slender, sub-equal in length excepted for sacrals (f) and clunals (h) longer. Sacral and clunal setae inserted in very small bulges, much smaller than in females (length of holotype and variations of four paratypes): v 2 30 (27– 33); sc 1 27 (25–33); sc 2 32 (27–32); c 1 34 (30–34); c 2 28 (28–29); c 3 35 (29–34); d 1 31 (29–30); d 2 31 (30–33); e 1 32 (31–34); e 2 38 (32–35); f 1 38 (33–39); f 2 39 (32–35); h 1 35 (32–36). Prodorsal striation with large irregular pattern medially. There are no lobes on striation. Gnathosoma – Peritreme anastomosed distally with distal enlargement smaller compared to female. Palptarsus eupathidia and solenidion sub-equal in length. Venter – Ventral striae without lobe. Legs – Leg I length superior to body length, 478 (403–450) µm long (length of holotype and variations of four paratypes). Variations are observed on the chaetotaxy of tarsus I and more on tibia I. Leg chaetotaxy as follows: I 2 − 1 − 8 − 5 − 5 + (9) [(8–10)] + 8 [6–7] duplexes − 10 + (6)[5] + 6 duplexes; II 2 − 1 − 5 − 5 − 9 − 11 + (2) + 1 duplex; III 1 − 1 − 3 − 3 − 8 − 11 + 1 duplex; IV 1 − 1 − 3 − 3 − 8 − 11 + 1 duplex. Tactile members of duplex setae on tarsi III and IV about one fourth the length of solenidia. Empodia I–IV bear true claws pad-like, about half as long as empodial claws bearing two rows of ventrally directed hairs. Aedeagus – Shaft long 105 (94–112) µm long, twice abruptly constricted consecutively towards its distal part and ending in a needle-like tip. Whole distal part 15 (15–16) µm long. Female: 6 females measured. Idiosoma: length 390–476 µm long, gnathosoma 143–160 µm long, width 316–378 µm. Dorsum –Dorsal body setae short, serrate and subspatulate. Sacral (f) and clunal (h) setae slightly less spatulate and longer than other setae. Sacrals and clunals inserted in obvious bulges. Setal length variations of six paratypes: v 2 30–34; sc 1 25–29; sc 2 25–29; c 1 27–31; c 2 25–29; c 3 26–30; d 1 24–28; d 2 22–30; e 1 26 –35; e 2 30 –39; f 1 38–44; f 2 38–43; h 1 40–46. Prodorsal integument with fine longitudinal broken lines of various lengths medially. The rest of the dorsum bears continuous smooth striae without lobes, longitudinal on prodorsum laterally, mainly transverse on hysterosoma medially and longitudinal laterally. Gnathosoma – Stylophore rounded. Peritreme ends in anastomosing chambers. Length of solenidion and eupathidium su slightly inferior to eupathidia ul' and ul''. Venter – Area immediatly anterior to genital flap with irregular striation. Ventral striation without lobe. Spermathecal sacculus oblong slightly enlarged distally with a rugose surface. Two pairs of para-anal and three pairs of anal setae. Legs – Leg I slightly longer than body, 408–480 µm long (variations of six paratypes). Leg chaetotaxy as follows: I 2 − 1 −8 − 5 − 13 + (1) − 14 + 2 duplexes; II 2 − 1 − 5 − 5 − 9 − 11 + 1 duplex; III 1 − 1 − 3 − 3 − 8 − 11 + 1 duplex; IV 1 − 1 − 3 − 3 − 8 − 11 + 1 duplex. Associated setae on tarsi III and IV with tactile setae about a sixth the length of solenidia. Empodia I–IV with true claws pad-like, about the half the length of empodial claws bearing two raws of ventrally directed hairs. Etymology. The species designation refers to the dilemma in the generic assignation of this new Petrobia due to the ambiguity in the signification given to the word tubercle by different authors.Published as part of Auger, Philippe, Chaaban, Samah Ben, Grissa, Kaouthar Lebdi, Khoualdia, Othman & Flechtmann, Carlos H. W., 2009, Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas, pp. 29-49 in Zootaxa 2232 on pages 40-44, DOI: 10.5281/zenodo.19032
Biology and life-table of Typhlodromus (Anthoseius) athenas (Acari: Phytoseiidae) fed with the Old World Date Mite, Oligonychus afrasiaticus (Acari: Tetranychidae)
No full textInternational audienceThe old world date mite Oligonychus afrasiaticus is an important spider mite pest of the date palms Phoenix dactylifera L. mostly in North Africa and the Middle East. A population of the predaceous mite Typhlodromus (Anthoseius) athenas has been recently found in Tunisia in association with a decrease of O. afrasiaticus densities. The objective of this paper was to assess the development and reproduction abilities of T. ( A.) athenas on O. afrasiaticus under laboratory conditions at two temperatures: 27 and 32 °C. The results obtained show that females of T. (A.) athenas develop in 5 days at 27 °C and 4.1 days at 32 °C. The mean fecundity of T. (A.) athenas was 32.1 and 23.2 eggs per female at 27 and 32 °C, respectively. Life table parameters were stimated: the net reproductive rate (Ro) 27.9 and 17.9 eggs/female, the intrinsic rate of increase (rm) 0.322 and 0,344 female/female/day and the mean generation time (T) 10.3 and 8.4 days at 27 and 32 °C, respectively. At both temperatures tested, T. (A.) athenas intrinsic rate of increase was greater than that of O. afrasiaticus (rm = 0.213 at 32 °C,against rm = 0.166 day1 at 27 °C). Typhlodromus (A.) athenas would be able to develop at a wide range of temperatures feeding on O. afrasiaticus and seems to be able to potentially control it
Oligonychus afrasiaticus and phytoseiid predators' seasonal occurrence on date palm Phoenix dactylifera (Deglet Noor cultivar) in Tunisian oases
No full textContact: [email protected] old world date mite Oligonychus afrasiaticus (McGregor) (Prostigmata Tetranychidae) is an important spider mite pest of the date palms Phoenix dactylifera L. in most of North Africa and the Middle East. This study was conducted between 2004 and 2006 in an orchard of date palm trees located in southwest Tunisia. The objective of this study was the inventory of mites that revolve around the date palm, to quantify abundance of O. afrasiaticus in trees over different types of ground cover and to document its dispersal. The starting of O. afrasiaticus infestation on fruits varied between years, ranging from the first to the third week of July. Mite populations on pinnae remained low from May through December, not exceeding two mites per pinnae, whereas on fruit they reached peak populations of approximately 14 motile forms of mite per fruit in 2006. Indigenous phytoseiid were not found on fruits between mid-Julys till the end of August, when pest populations peaked. Plants such as Sorghum bicolor (L.) Moench, Solanum melongena L., and Cucumis melo L. contained densities of O. afrasiaticus during early spring, and may have formed the source for later date palm infestation. Fruit bunch infestation was not prevented or even alleviated by glue barriers so infestation of date palm by O. afrasiaticus may occur via aerial dispersal of motile forms. In ground cover phytoseiid and tetranychid mites were scarce, two of tetranychid species are new to science were founded
Oligonychus afrasiaticus and phytoseiid predators' seasonal occurrence on date palm Phoenix dactylifera (Deglet Noor cultivar) in Tunisian oases
No full textContact: [email protected] old world date mite Oligonychus afrasiaticus (McGregor) (Prostigmata Tetranychidae) is an important spider mite pest of the date palms Phoenix dactylifera L. in most of North Africa and the Middle East. This study was conducted between 2004 and 2006 in an orchard of date palm trees located in southwest Tunisia. The objective of this study was the inventory of mites that revolve around the date palm, to quantify abundance of O. afrasiaticus in trees over different types of ground cover and to document its dispersal. The starting of O. afrasiaticus infestation on fruits varied between years, ranging from the first to the third week of July. Mite populations on pinnae remained low from May through December, not exceeding two mites per pinnae, whereas on fruit they reached peak populations of approximately 14 motile forms of mite per fruit in 2006. Indigenous phytoseiid were not found on fruits between mid-Julys till the end of August, when pest populations peaked. Plants such as Sorghum bicolor (L.) Moench, Solanum melongena L., and Cucumis melo L. contained densities of O. afrasiaticus during early spring, and may have formed the source for later date palm infestation. Fruit bunch infestation was not prevented or even alleviated by glue barriers so infestation of date palm by O. afrasiaticus may occur via aerial dispersal of motile forms. In ground cover phytoseiid and tetranychid mites were scarce, two of tetranychid species are new to science were founded
Five new species of Tetranychidae (Acarina, Prostigmata) from south Tunisian oasis areas
No full textCorresponding author. E-mail: [email protected] audienceIn this paper we present the description of five new species of tetranychid mites collected in south Tunisian oasis areas. These are: Bryobia alveolata sp. nov., Aplonobia crispipilis sp. nov., Petrobia (Petrobia) carthagensis sp. nov., Petrobia (Petrobia) pseudotetranychina sp. nov. and Tetranychus (Tetranychus) atriplexi sp. nov. The notion of dorsal tubercles used to separate the sub-genera Tetranychina from Petrobia sensu stricto and Mesotetranychus among the genus Petrobia is also discussed
