Lepidobrya mawsoni ( Tillyard, 1920 )

Zhang, Feng, Greenslade, Penelope & Stevens, Mark I., 2017, A revision of the genus Lepidobrya Womersley (Collembola: Entomobryidae) based on morphology and sequence data of the genotype, Zootaxa 4221 (5), pp. 523-536 : 525-529

publication ID

https://doi.org/ 10.11646/zootaxa.4221.5.2

publication LSID

lsid:zoobank.org:pub:BBDDA01D-7AFB-46AA-971D-9B86F664D105

DOI

https://doi.org/10.5281/zenodo.5676344

persistent identifier

https://treatment.plazi.org/id/C645EC35-537E-FF84-FF12-FF7AFF1CF83B

treatment provided by

Plazi

scientific name

Lepidobrya mawsoni ( Tillyard, 1920 )
status

 

Lepidobrya mawsoni ( Tillyard, 1920)

Figs 1‒39 View FIGURES 1 ‒ 3 View FIGURES 4 ‒ 9 View FIGURES 10 ‒ 15 View FIGURES 16 ‒ 24 View FIGURES 25 ‒ 29 View FIGURES 30 ‒ 33 View FIGURES 34 ‒ 39

Entomobrya mawsoni Tillyard, 1920

Type locality. Garden Cove , Macquarie Island, Australia.

Type material. Australian Museum, Sydney, holotype (AAE 12I2 on slide) and paratypes (AAE 12‒13 on slides and C 24 in alcohol).

Material examined. Three females and one male on slides and three in alcohol, Australia: Macquarie Island : Razorback Ridge, 54.503°S, 158.933°E, 22.viii.2010, Peter Hudson leg. One slide and one in alcohol depsited in NJAU and others in SAMA. Additional material examined on slides (all Macquarie Island): Buckles Bay, 1931 GoogleMaps ; North Arm , 7.xi.1972 ; Isthmus , 11.iii.1975 ; Isthmus , 17.xi.1977 ; Plateau , xii.1986 ; Buckles Bay , 5.i.1987 .

Redescription. Body length up to 3.00 mm. Background colour yellow in alcohol. Violet pigment on antennae and legs and dark blue pigment on body. Antennae gradually becoming darker from base to apex. Eye patches dark with a transverse band between them ( Fig. 1 View FIGURES 1 ‒ 3 ). Transverse bands on posterior half of Abd. II, Abd. III, distal margin of Abd. IV, and Abd. V. Lateral stripes on thorax and Abd. IV. Irregular longitudinal patches on median part of Th. II‒Abd. I. Distal parts of trochanters, femora and tibiotarsi pigmented ( Figs 1‒3 View FIGURES 1 ‒ 3 ). Scales brown, narrow, pointed with short ribs ( Figs 3‒9 View FIGURES 1 ‒ 3 View FIGURES 4 ‒ 9 ); scales in the posterior row along margin of Th. II‒Abd. III larger than anterior ones ( Figs 3‒8 View FIGURES 1 ‒ 3 View FIGURES 4 ‒ 9 ); on Abd. IV, only few chaetae in the posterior row along margin transformed into scales ( Fig. 9 View FIGURES 4 ‒ 9 ); a row of long, thin chaetae along posterior margin of Abd. V ( Fig. 10 View FIGURES 10 ‒ 15 ); scales ventrally on manubrium ( Fig. 11 View FIGURES 10 ‒ 15 ) and dens ( Fig. 13 View FIGURES 10 ‒ 15 ) narrower than those on body. Scales on Ant. I‒II ( Fig. 14 View FIGURES 10 ‒ 15 ), legs, ventral side of manubrium and dens, and dorsal side of head and terga but absent from Ant. III‒IV, ventral tube and dorsal side of manubrium ( Fig. 12 View FIGURES 10 ‒ 15 ) and dens.

Antenna 2.03‒2.41 times as long as cephalic diagonal. Antennal segment ratios as I: II: III: IV = 1: 1.55‒1.75: 1.50‒1.65: 2.23‒2.60. Smooth, spiny mic at base of antennae: three dorsal ( Fig. 14 View FIGURES 10 ‒ 15 ), four ventral ( Fig. 15 View FIGURES 10 ‒ 15 ) on Ant. I, one internal, one external and two ventral on Ant II. Ant. II distally with 2‒3 rod-like S-chaetae. Ant. III organ with two rods and three guard chaetae ( Fig. 16 View FIGURES 16 ‒ 24 ). Antennal apical bulb absent.

Eyes 8+8, G and H smaller. Labral margin with four simple papillae. Labral intrusion U-shaped. Prelabral and labral chaetae 4/5, 5, 4; prelabral ones ciliate; median three chaetae of the first row longer than lateral ones ( Fig. 17 View FIGURES 16 ‒ 24 ). Clypeal chaetae ciliate with about facial 25 chaetae ( Fig. 18 View FIGURES 16 ‒ 24 , after Zhang et al., 2016a). Dorsal cephalic chaetotaxy with five antennal (An), five(six) median (M) and eight sutural (S) mac; a pair of mac between anterior and median mac and a sixth mac in the median row present in one specimen; interocular chaetae seven or eight ( Fig. 19 View FIGURES 16 ‒ 24 ). Mandibles with 4/5 (left/right) teeth. Subapical chaeta of maxillary outer lobe slightly larger than apical one; three hairs on sublobal plate; all smooth. Labial papillae A‒E with 0, 5, 0, 4, 4 guard chaetae, respectively; tip of lateral process of labial palp not reaching apex of labial papilla ( Fig. 20 View FIGURES 16 ‒ 24 ). Labium with five and 8(9) chaetae on mentum and submentum ( Fjellberg 1999), respectively; chaeta R 0.70‒0.75 times of M in length. Chaetae posterior to labium ciliate. Cephalic groove with 12‒16 ciliate chaetae ( Fig. 21 View FIGURES 16 ‒ 24 ).

Metatrochanteral organ with 35¯44 smooth spine-like chaetae ( Fig. 22 View FIGURES 16 ‒ 24 ). Inner differentiated tibiotarsal chaetae finely ciliate ( Fig. 34 View FIGURES 34 ‒ 39 ). Tibiotarsi distally with 10 ciliate chaetae in a whorl. Unguis with two inner, one outer and two lateral teeth; unpaired inner teeth absent. Unguiculus truncate with one inner and one outer teeth. Tenent hairs weakly ciliate with tip clavate and subequal to unguis in length ( Fig. 23 View FIGURES 16 ‒ 24 ). Abd. IV 4.89‒6.43 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 32‒49 ciliate chaetae, two of them much longer and thicker than others ( Fig. 24 View FIGURES 16 ‒ 24 ); posteriorly with two apical smooth and about 90 proximal ciliate chaetae; each lateral flap with five smooth and eight ciliate chaetae ( Fig. 25 View FIGURES 25 ‒ 29 ). Tenaculum with 4+4 teeth and corpus with one large chaeta. Male genital plate with seven pairs of projections and internally with a pair of small chaetae ( Fig. 26 View FIGURES 25 ‒ 29 ). Manubrial plaque with two pseudopores and 17‒18 ciliate chaetae ( Fig. 27 View FIGURES 25 ‒ 29 ). Manubrium ventrally with about 40 + 40 distal scale-like chaetae or extremely narrow scales ( Figs 28 View FIGURES 25 ‒ 29 , 35 View FIGURES 34 ‒ 39 ). Dens without spines; distal smooth part 0.70 times as long as mucro. Mucro bidentate, basal spine short with tip reaching apex of subapical tooth ( Fig. 29 View FIGURES 25 ‒ 29 ).

Th. II with 7(8) medio-medial, three (m4, m 4i, m4p) medio-sublateral, 23‒25 posterior mac; p4 and p5 as mac; sens inner to ms. Th. III with 22 mac; m 5i, m5p, a 6i and m 6i as mac ( Fig. 30 View FIGURES 30 ‒ 33 ). Abd. I with 6(5, 4) mac (a2‒3, m2‒4, m4p); a2 and a3 sometimes as mic; sens inner to ms. Abd. II with five (a2, a3, m3, m3e, m3ep) central and one (m5) lateral mac. Abd. III with one (m3) central and four (am6, pm6, p6, m7a) lateral mac ( Fig. 31 View FIGURES 30 ‒ 33 ). Abd. IV with 22¯27 central, 16¯22 lateral mac with their homology difficult to determine ( Fig. 32 View FIGURES 30 ‒ 33 ). Abd. V with three sens ( Fig. 33 View FIGURES 30 ‒ 33 ). Tergal ms as 1, 0|1, 0, 1, 0, 0; sens as 2, 2|1, 2, 2,?, 3 ( Figs 18 View FIGURES 16 ‒ 24 , 30‒33 View FIGURES 30 ‒ 33 , 36, 37 View FIGURES 34 ‒ 39 ). Small scales present around abdominal bothriotricha ( Figs 37‒39 View FIGURES 34 ‒ 39 ).

Distribution. Australia ( Macquarie Island); New Zealand (Campbell Island, Auckland Islands).

Remarks. Types were not examined because the specimens having the same unique pigmentation accurately described by Tillyard have been collected for many times in Macquarie Island; the other two entomobryid species in this island, Lepidocyrtus cyaneus cinereus Folsom and Lepidosira terraereginae (Ellis & Bellinger) , distinctly differ from Lepidobrya mawsoni . Lepidobrya mawsoni is similar to L. thalassarchia and L. violacea from Campbell Island and L. aurantiaca from Auckland Island in having two inner teeth on unguis, truncate unguiculus with an outer tooth, and pointed scales even on dens. It differs from them by its unique colour pattern. Pigment patches are very stable in examined specimens even in those weakly pigmented individuals ( Fig. 40 View FIGURE 40 ). Womersley (1937) and Salmon (1949) mentioned a small antennal apical knob, which was never observed in our specimens. More details cannot be compared before the types or topotypes of the New Zealand species are examined. Greenslade (1994) synonymised L. aurantiaca Salmon, 1949 from Auckland Islands with L. mawsoni but did not give reasons. DNA barcodes from Adams Island provide potential support for this synonymy (see comments below).

SAMA

South Australia Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Entognatha

Order

Collembola

Family

Entomobryidae

Genus

Lepidobrya

Loc

Lepidobrya mawsoni ( Tillyard, 1920 )

Zhang, Feng, Greenslade, Penelope & Stevens, Mark I. 2017
2017
Loc

Entomobrya mawsoni

Tillyard 1920
1920
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