A new species of Eutarsopolipus berlese (Acari: Podapolipidae) from the Galapagos Islands, a parasite of Agonum chathami Van Dyke (Coleoptera: Carabidae)

8 Pages·2002·3.1 MB·

by  Robert W Husband

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PROC. ENTOMOL. SOC. WASH.
104(3). 2002. pp. 563-570
A NEW SPFXIES OF EVTARSOPOUPVS BERLESE
(ACARI: PODAPOLIPIDAE) FROM THE GALAPA(;OS ISLANDS, A
PARASITE OF AGONVM CHATHAMI VAN DYKE
(COLEOPTERA: CARABIDAE)
Robert W. Husband
1035 Scottdale Drive. Adrian, MI 49221. U.S.A. (e-mail: ihusband(«>adrian.edu)
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Abstract. Eiitarsopolipiis hrettae, n. sp. (Acari: Podapolipidae), is described from
Agonum chathami Van Dyke (Coleoptera: Carabidae) from the Galapagos Islands and
compared with related species of Eutarsopolipus. Characters of E. hrettae do not fit with
existing subgroups of Eutarsopolipus.
Key Words: beetle, Carabidae, parasitic mites, Acari, Podapolipidae, Galapagos, Ecuador
Mites in the family Podapolipidae (Acari: seum specimens is described in Husband
Heterostigmata) are highly specializedecto- and Dastych (1998).
and endoparasites of the insect orders Blat- Measurements, in micrometers ([xm),
taria, Orthoptera, Heteroptera, Hymenop- were taken with the aid of a Zeiss micro-
tera, and especially Coleoptera. The genus scope with a stage micrometer and drawing
Eutarsopolipus Berlese is restricted to hosts tube. The terminology used follows Lind-
in Carabidae (Coleoptera) and occurs quist (1986).
worldwide. Along with the type species, E.
lagenaefonnis Berlese 1913, more than 40 Eutarsopolipus hrettae Husband,
others have been discovered, of which 21 new species
were described by Regenfuss (1968. 1974).
(Figs. 1-3)
This is the first record of Eutarsopolipus —
from the Galapagos Islands. Diagnosis. Adult female E. hrettae lack
The puipose of this paper is to describe stigmata, cheliceral stylets are long, 75-85.
a new species collected from Agonum and ambulacral II, III claws are well devel-
chathami Van Dyke and compare it with oped (10). The genital capsule of male E.
other species ofEutarsopolipus parasitizing hrettae has concave lateral margins. Plates
the carabid genus Agonum. with Eutarso- C and D are separate in larval female E.
polipus from Central and South America, hrettae, cheliceral stylets are long (60-64),
and with related Eutarsopolipus worldwide. setae ofthe idiosoma and legs are long (Ta-
ble I), and the larval female has 3 femur I
Materials and Methods
setae in combination with 1 genu I seta (Ta-
Males, larval and adult females, and eggs ble 2).
of Eutarsopolipus hrettae were collected Adult female (Fig. 1). Gnathosoma:
from Agonum chathami Van Dyke bor- Length 62-69, width 60-67. Palp length
rowed from the California Academy ofSci- 22-25; cheliceral stylet length 75-85 with
ences, San Francisco, California, U.S.A. basal sclerite 12—15, pharynx width 17,
The technique for removing mites from mu- walls of pharynx thick, dorsal gnathosomal
564 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
E
E
1
Fig. I. Eiitarsopolipus brettae, adult female: left, ventral aspect; right, dorsal aspect.
VOLUME NUMBER
104. 3 565
o-
Fig. Eittarsopolipiis hrettcie. adult male: Ict'l, ventral aspect; right, dorsal aspect.
setae 32-35, ventral setae 20-25, distance d 7-8. Plate EF length 40-53, width 130-
between ventral setae 18—20. No stigmata. 145, setae e 7-8, no setae Z?,, lu.
Idiosoma: Length 266-450, width 209- Venter: Apodemes and 2 weakly de-
1
318. Prodorsal plate setae i', 12-15 \s 7-8, veloped, meeting sternal apodeme medially;
scj 25—30, setae about 10 from posterior sternal apodeme not extending beyond
margin of prodorsal plate. Distance be- junction with apodemes 2. Coxal setae \a
tween setae i', 55—56; \'2 lateral to line con- 3-4, 2a 5-6; setae \a situated equidistant
necting I'l and .vcN. Plate C midlength 60- to apodemes 1, 2. Distance between setae
70, width 237-265, setae r, 7-8, c. 9-10. \a 37-52. Coxal setae 3a not evident, 3/?
Plate D length 50-75, width 175-197, setae 6-7.
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566 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
Fig. 3. Eiitarsopolipiis brettae, larval female; left, ventral aspect; right, dorsal aspect.
Legs: Leg setation as in Table 2. Am- Tibia I solenidion cj) 8-9, adjacent seta k 4-
bulacrum I with a terminal stout claw, am- 6. Tibial I, II, III setae d 45-50, 30-33 and
bulacra II, III with 2 strong claws. Tarsus I 20-22 respectively.
subunguinal seta spinelike, 2 terminal Male (Fig. 2). Gncithosoiua: length
spines on each of tarsi II, III. Tarsus I so- 37-40, width 36-37. Palp length 13-17;
lenidion co 5-6; tarsus II solenidion o) 5. cheliceral stylet length 25-31, no basal
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.
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104. 3 567
sclerite; pharynx width 10-11, dorsal gna- Ambulacra II, III with small, diverging
thosomal setae thiek 2-4. ventral setae 9- claws. Tarsus I spinelike seta .v 5, tarsi II,
13. 111 spinelike setae tc' and u' 5-7. Tarsus I
Idiosoimi: Length 170-188, width 120- solenidia co 3-5, tarsus II solenidion 00 5.
147. Prodorsal setae v, m, is m, setae .vc, Tibia I solenidion ([> 9-10, seta k 3. Setae
53-65. Distance between setae \\ 20-21, tc' 7-9, tc" 9-10. Tibiae I, II, III setae d
distance between setae v^ 52; setae is lateral 35-40, 18-23 and 17-25 respectively.
to line connecting setae i-, and sc2- Plates C Egg.—Length 210-240, widt—h 120-135.
and D fused, setae c,, is. d, and e vestigial Type, host, and locality data. Holotype
or not present. Genital capsule length 28- 9 (RWHO10501-1 ). allotype 6 and 24 par-
30, width 30-35 at base, concave lateral atypes: from Chatham Island, Galapagos Is-
margins. lands. Ecuador, from under eleytra o^Agon-
Venter: Apodemes 1, 2 and sternal apo- urn chathaiui Van Dyke (Carabidae) col-
deme evident; coxae III separated medially. lected by F S. Will—iams, 3 October 1905.
Setae la, 2a, 3b microsetae, 3^ not evident. Type deposition. Holotype, allotype, 9
Legs: Leg setation as in Table 2. Am- adult 9 paratypes, 6 S paratypes, 3 larval
bulacrum 1 with 1 thick claw, length 4, am- 9 paratypes and 2 egg paratypes of Eutar-
bulacra 11. Ill with small claws 3. Tarsus 1 sopolipus brettae deposited in the Depart-
spinelike seta s 5-6, tarsi II, III spinelike ment of Entomology, California Academy
setae tc' and //' 5-7. Tarsus I solenidion oo of Sciences, San Francisco, California,
5—6, tarsus II solendion co 4-5; tibia I so- U.S.A. One 6, 2 adult 9, 1 larval 9 and 1
lendion ^ 8, adjacent seta k 2-3. Tibiae I, vial ofparatypes in the collection ofthe au-
II, III setae d 30-33, 15-22, 19 respective- thor. —
ly. Genu III seta v" evident in only 1 male. Etymology. The species is named for
Larval female (Fig. 3). Gnathosoina: Roberta Brett, California Academy of Sci-
length 44-53, width 42-45. Palp length ences, San Francisco, California, in recog-
15-20, cheliceral stylet length 60-64, stylet nition of her support of studies of parasitic
basal sclerite 7-8, pharynx width 12-13. mites of insects.
dorsal gnathosomal setae 31-36. ventral se-
Discussion
tae 13—14. distance between ventral setae
14-20. Before Regenfuss (1968) described 16
Idiosoma: Length 165-192, width 125- new species of Eutarsopolipus from Ger-
132. Prodorsal plate setae v, 17-20, is 9- many, only E. lagenaeformis from Italy and
16, SC2 84—85. Distance between setae \\ E. desani Cooreman 1952 from Central Af-
34-45; setae is lateral to line connecting rica were known. Regenfuss (1968) defined
setae v, and setae ^r^. Plates C and D sep- 7 subgroups of Eutarsopolipus. As new
arate, setae c, 7-8. c^ 8-10, setae d 7-8: species were described from Pacific Islands,
distance between setae d 30-33. Setae C2 in Australia, India, S. Africa, and the Western
line with setae r,. Plate EF oval, setae e 1 Hemisphere, characters of existing sub-
Plate H broader at base, setae Z?, 80-90, /?, groups of Eutarsopolipus no longer worked
5-7, distance between setae /?, 2. in placing new species. Husband (1995)
Venter: Apodemes 1, 2 and sternal apo- created the ochoai subgroup and Husband
deme conspicuous but weakly scerotized. and Macfarlane (1999) created the catad-
m
Setae \a 3-4, 2a 3-5, 3a and 3h 5. Dis- ronii and secundus subgroups. There are
tance between setae 3a and 3b 18-20, setae now more than 40 species of Eutarsopoli-
3a visible only in larval exoskeleton asso- pus and many more expected from the more
ciated with adult female. than 25,000 known species of Carabidae.
Legs: Leg setation as in Table 1. Am- Major characters used to distinguish sub-
bulacrum I with 2 small, parallel claws. groups of Eutarsopolipus include: presence
568 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
Table 1. Comparisons of characters and maximum measurements of Eiitarsopolipits brettae with Eiitarso-
polipus species in thepterostichi and agoiiuni groups, E. trichognathi from South America and E. ochoai from
Central America.
CharacK-r
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104. 3 569
Table 2. Leg selation of tciiuir. izciui. tibia and tarsus lor larval Icmalc h. hrctuic and related species.
-Solenidia are included. Two numbers in a column indicate \ariation in seta! numbers.
570 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
Acknowledgments America. International Journal of Acarology
25(1): 13-17.
The assistance of Roberta Brett and Da- Husband, R. W. and H. Dastych. 1998. A new species
vid Kavanaugh, Department of Entomolo- of Eutarsopolipus (Acari: Podapolipidae) from
gy, California Academy of Sciences, Gold- CfhrloamerAntuhsensse,riGceeuosrgFirao.stU.(SCo.lAe.opEtnetrao:moClaorgaibsicdhaeen)
en Gate Park, San Francisco, California, Mitteilungen ausdemZoologischeMuseum Ham-
U.S.A. in acquiring specimens and advice burg 12(158): 317-326.
on host beetles is appreciated. Husband, R. W. and M. Eidelberg. 1996. A new spe-
cies of Eutarsopolipus (Acari: Podapolipidae)
from Trichognathus marginipennis (Coleoptera:
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