Hanseniella arborea n . sp . , a migrating symphylan from an Amazonian blackwater inundation forest ( Myriapoda , Symphyla , Scutigerellidae )

More than 800 specimens of migrating symphylans (Myriapoda, Symphyla, Scutigerellidae) have been collected in an inundation forest at the rio Taruma-Mirim near Manaus in Brazil. They belong to a new species, Hanseniella arborea, which is described. The material is from the migration into the capony prior to the inundation. All the specimens were collected in arboreal photoecectors placed at the height of 3.60m. above the ground.


INTRODUCTION
No sericus attempt to collect symphylans in Brazil has ever been made but nevertheless there are a few records from there.The f1 rst one might be that by Hansen who reported Symphylel/a antennata (Hansen) from Bella Vista at the Paraná in 1903 and the next one that by Juberthie-Jupeau in 1962.She reported there three more species: Scolopendrellopsis brasiliensis (Juberthie-Jupeau), Hanseniella longisetis (Juberthie-Jupeau) and H. unguiculata (Hansen) .The two former had been collected at Ou itihanda near Petropolis the latter one at Pico da Tijuca.
To this list is here added Hanseniella arborea n. sp. which was collected from near Manaus in 1976 by Dipi.-Biol.Joachim Aàis, Gõttinge11.The species appeared in large numbers in arboreal photoeclectors placed in 3.60m height on three big trunks (on Aldina heterophylla, A. latifolia and Peltogyne venosa) in an investigation area of about 150 x 100 m in a blackwater inundativn forest at Rio Tarumã Mirim.The symphylans are migraHng between forest f loor and canopy depending on the water-level: upwards in January-March anel downwards in August-October.The material studied was from the upward migration.lhe new species is described below.HEAD.Head short, (1 .1-) 1.2 times as broad as long with a prominent lateral angle at point of articulation of mandible.Central rod short, (O.3-) O. 4 of length of head, indi<>t inct and w ith its ovoid posterior endswelling feebly marked; anterior branches vestigial, posterior ones lacking.Dorsal surface of head covered with straight thin setae of different length; most of them are short but a few longer setae are irregularly scattered among them, particularly most an• teriorly and on posterior part; longest setde about twice longe r than shorter ones .The longest sela in front of lateral angle O. 5 (-0 .7) of length of diameter of first ar.tennalsegment.There J:lre 3 long subequal postantennal 3etae.Palp of first maxilla conical, pointed.Head cuticle glabrous.

ANTENNAE.
Antennae with 24 and 25 (17-331 segments; length (0.3-) 0.4 (-0.5) of the length of trunk .First segment (1.3-) 1. 4 ( -1 .6) times as wide as long with a single primary whorl of (5-) 6 setae of normal length and 1 (-21 short setae.There is also a thin inner seta behind the primary whorl; its length (O.5-) 0.6 o f the length o f inner primary Jetae.The latter are thin and slightly longer than the other normal length setae of primary whorl: Second segme11t 1. 3 (-1.5) times as long as wide with (9-) 1 O setae in primary whorl; these setae are on tergal, inner and sternal sides; there are 3 thin inner setae, (3-) 6 thicker ones on tergal and sternal sides and one very short on inner tergal (or sternal) side; mner thin setae longest and a !ittle more depressed than tergal and sternal ones.Small spined organs begin on outer lateral part of terg;~l si de of 2nd segment.Secondary whorl of setae begins with one seta on inner sternal part of 5th (-8th) segment; this whorl neve r complete.Tenth segment with shorter setae than on proximal segments; outer and inner setae of about the same length, tergal ones a little longer than sternal ones.A 3rd whorl of setae is on sternal side of distai half of antenna.Apical segment (1.2-) 1.3 (-1.4) times as Jong as wide with setae only on apical half.These setae are mainly anteriorly directed and of different lengthh, longest ones O. 6 (-O.7) of longest setae on proximal segments.Large spined organ at apex of this segment is 0.3(-0.4) of Jength of segment; there are also (1-) 2 (-3) very short and delicate spined organs.First segment mai nly glabrous but with a scaly cuticular pattern; a few pubescence hairs on distai part of tergal and outer lateral sides on a levei w it h the prímary whorl of setae.Proximal segments from 2nd segment forth with a sparse evenly di stributed pubescence; on distai segments pubescence is denser but distai part of apical segment almost glabrous.
LEGS.Tarsus of first pair of legs (4.3-) 4.4 ( -4. 7) times as long as wide, slowly tapering distally.Tergal setae in two rows lengthways, both with 3 (-4) setae; distai setae longer than proximal ones, the Jongest ones (about) as long as greatest diameter of tarsus.Sternal si de wíth 4 ( -6) seta e in two rows lengthways.Anterior claw acuminate, almost straight, its length O. 2 of the length of tarsus and ( 1 .3-) 1 .8 ( -2.O) times as long as posterior claw.Front seta as long as (or a l ittle shorter than) posterior claw.Pubescence sparse, distinct Tibia short with 3(-4) tergal setae.Femur w rth 11 (-15) setae on anterior and sternal sides; one (or sometimes two) of them are distinctly longer than t he rest and one is very short; pubescence only on anterior side.sparse.
Pubescence of tarsus dense and short, a little sparse only on posterior side; pubescence well developed on remaini ng segrnents too except on posterior si de of trochanter .Cúticle with scaly pattern of thin thickenings on tergal side of trochanter and, but vestigial, on anterior side of femur.
Protruding distai setae on tibia and femur are on legs 9-12; distinctly increased number of sternal setae on the tarsus in males occur on legs 10-12.
Gerei.They are slender, O. 1 of the length of body and (4 .2-)4.3(-4.9)times as tong as wide.There are (5-)6(-7) setae in longest tergal row; length of setae increases distally, the most distai one is longest, (as long as -) 1 .2 ( -1 .3) times as long as the depth of cercus.Longest sternal row has (4-)5 setae; the most distai one as long as (-a little longer than) corresponding tergal seta.Terminal part of cerci very sle nder, almost cylindrical .Outer Hanscniella ... apical seta O. 2 of length of cercus and the short median one 0.2(-0.3} of the length of the long seta; the short seta is triangular in shape.Cuticle with scaly pattern of thin thickenings on ali sides; pubescence very sparse, best developed proximally, lacking distally.
Affinities.As to the general appearance of the tergites and the macrochaetae on the last pair of legs H. arborea has significant features in cornmon with montana Scheller from Sri Lanka but there are many separating characters on the cerci and the first pair of legs and as to the structure of the dorsal cuticle .In a simila:-way it is partly alike proxima Adam and Burtel from New Zealand.
From the distribution of the macrochaetae on the tíbia and femur of the last pair of legs the species is close to chilensis (Hansen) from Chile and the occurrence of a great number of short subequal setae on the inner side of the tarsus of the same leg is a character also found in capensis (Hansen) from South Africa.However. it is unknown i f the latter character is a manifestation of sexual dimorphism in capensis.

SUMMARY
More than 800 specim3ns of mlgrating symphylans (Myriapoda, Symphyla.Scutigerellldae) have b~en collected in an inundation forest at the rio Tarumã-Mirim near Manaus in Brazil .They belong to a new species.Hanseniella arborea, which is described The material is from the migration into the capony prior to the inundation .Ali the specimens were co'lected in erboreal photoecectors placed at the height of 3 60m, above the ground .