Bomis larvata L. Koch, 1874, L. Koch, 1874

Szymkowiak, Paweł & Królikowska, Sylwia, 2017, Redescription of Bomis larvata L. Koch, 1874 with the description of a new Australian species, Zootaxa 4323 (4), pp. 451-468: 453-455

publication ID

https://doi.org/10.11646/zootaxa.4323.4.1

publication LSID

lsid:zoobank.org:pub:0301AC55-FAA6-45AF-BF1E-32105675F460

persistent identifier

http://treatment.plazi.org/id/03EF1F6B-FFD9-FF8B-FF16-FE92FF530773

treatment provided by

Plazi

scientific name

Bomis larvata L. Koch, 1874
status

 

Bomis larvata L. Koch, 1874  

Figs 1–28 View FIGURES 1–6 View FIGURES 7–13 View FIGURES 14–19 View FIGURES 20–22 View FIGURES 23–28 .

Bomis larvata L. Koch, 1874: 528   , pl. 40, figs 4, 4d (female). L. Koch 1876: 798, pl. 69, fig. 4 (male). Simon 1895: 1005, figs 1068–1069.

Etymology. No etymological explanation was provided in the original description by L. Koch. “ Larva ” means mask, ghost in Latin. Maybe “ larvata   ” refers to the immature form of an adult; in the context of the species it may refer to the tiny size of the species which resembles juvenile spiders.

Type material: Syntypes: AUSTRALIA: Queensland: 1 female, Rockhampton ( NMW 1884 I 402, examined)   ; 3 females, Port Mackay (1 female detached: body, palpi, chelicerae; slide 3421a) ( ZMB 3421 View Materials , not examined)   ; 1 female, Port Mackay ( ZMH 9933 View Materials , examined)   .

Other material examined. AUSTRALIA: New South Wales: 2 males, Sydney , L. Koch det. (personal communication Dr. Jürgen Gruber) ( NMW 1882 II 124)   . Queensland: 1 male, Priestdale, Burbank, Buhot Creek , 50 m, riparian forest, sweeping net, 51198, [27°35.5'S, 153°10.3'E], 30 April 2003, E. Volschen leg. ( QM S 62820 View Materials ) GoogleMaps   ; 3 males, 4 females, Priestdale, Burbank, Buhot Creek , 50 m, riparian forest, sweeping net, 51685, [27°35.5’S 153°10.3’E], 6 November 2003, S. Wright leg. ( QM S 67498 View Materials ) GoogleMaps   ; 1 female, Priestdale, Burbank, Buhot Creek , 50 m, riparian forest, sweeping net, 51855, [27°35.5’S, 153°10.3’E], 18 February 2004, QM party leg. ( QM S 67499 View Materials ) GoogleMaps   ; 10 females, North Stradbroke Island Enterprise, Blackbutt , 90 m, sweeping net, 50934, [27°33’S, 153°28’E], 9 January 2002, C. J. Burwell leg. ( QM S 55680 View Materials ) GoogleMaps   ; 10 females, North Stradbroke Island Enterprise, Blackbutt , 80 m, sweeping net, 50936, [27°35’S, 153°28’E], 9 January 2002, C. J. Burwell leg. ( QM S 56152 View Materials ) GoogleMaps   ; 1 female, North Stradbroke Island Enterprise, Mallee , 120 m, sweeping net, 50937, [27°34’S, 153°26’E], 11 January 2002, C. J. Burwell leg. ( QM S 55681 View Materials ) GoogleMaps   ; 8 females, North Stradbroke Island Enterprise, Scribbly Gum , 70 m, sweeping net, 50942, [27°36’S, 153°27’E], 10 January 2002, C. J. Burwell leg. ( QM S 55679 View Materials ) GoogleMaps   ; 3 females, Port Mackay , Keyserling coll. ( NHML 1890.7.1.3468-70)   ; 2 males, 1 female, Rockhampton ( NHML 1915.3.5.3344–46)   . Western Australia: 1 female, Dirk Hartog Island, Brown Station, Stat. 67, Hartmeyer and Michelsen, Hamburg S.W. Austral., Exp. 1905, 14 September 1905 ( ZMB 16614 View Materials , not studied)   .

Diagnosis. Ventral margin of clypeus shaped like a curly bracket ( Figs 3 View FIGURES 1–6 , 8 View FIGURES 7–13 , 14–15 View FIGURES 14–19 ). Venter of opisthosoma with one oval apodeme in the middle ( Fig. 17 View FIGURES 14–19 ). Epigyne nearly as wide as long with two protruding conical protuberances situated close to its lateral margins, epigynal orifices directed exteriorly on protuberances ( Figs 5 View FIGURES 1–6 , 11–12 View FIGURES 7–13 , 19 View FIGURES 14–19 ). Male palp with subelliptical or nearly spherical tegulum and straight embolus half the length of the tegulum ( Figs 21 View FIGURES 20–22 , 27 View FIGURES 23–28 ); cymbial notch on retrolateral side of palp ( Fig. 28 View FIGURES 23–28 ).

Redescription. Female: Body length: 1.75–2.66 (mean=2.24, SD±0.18, n=37): prosoma length: 0.58–1.38 (mean=0.99, SD±0.11, n=40), prosoma width: 0.82–1.4 (mean=1.02, SD±0.09, n=40), prosoma height: 0.45–0.98 (mean=0.67, SD±0.12, n=40), prosoma length/width ratio: mean 0.97 (n=40), opisthosoma length: 1.18–2.4 (mean=1.45, SD±0.22, n=39), opisthosoma width: 0.95–2.88 (mean=1.75, SD±0.27, n=39), opisthosoma height: 0.8–2.48 (mean=1.24, SD±0.29, n=38), opisthosoma length/width ratio: mean 0.83 (n=39). Prosoma highly convex, greatest height in the middle ( Fig. 4 View FIGURES 1–6 ), greatest width at about two third of height ( Figs 3 View FIGURES 1–6 , 8 View FIGURES 7–13 ), dorsal part (excluding posterior declivity and including clypeus and the area of eyes) covered by numerous, minute tubercles and small cavities ( Figs 3–4 View FIGURES 1–6 , 8 View FIGURES 7–13 , 14 View FIGURES 14–19 ). Clypeus length about 0.4, runs steeply toward chelicerae ( Fig. 4 View FIGURES 1–6 ), anterior margin with acute point in the middle of chelicerae ( Figs 3 View FIGURES 1–6 , 8 View FIGURES 7–13 , 14–15 View FIGURES 14–19 ), ratio of clypeus length to AME-AME distance 1.9. Eyes. All lenses small (0.035 –0.049), PMEs being the smallest, ALEs equal in size to PLEs, ALEs and PLEs on small tubercles, PMEs oval in shape, slightly elevated, orientated rearward, AMEs without welldefined eye chambers, ALE, PLE and PME closer to each other than to AME ( Figs 3 View FIGURES 1–6 , 8 View FIGURES 7–13 ), MOA of trapezium shape, broad in comparison to the area of all the eyes; AME-AME 0.24, AME-ALE 0.14, ALE-PLE 0.15, PLE-PME 0.17, PME-PME 0.38, AME-PME 0.25, PLE-PLE 0.54, MOA length 0.31, MOA width anterior 0.32, MOA width posterior 0.46, x/y ratio 0.67 ( Fig. 7 View FIGURES 7–13 ), diameter of lenses: ALE=PLE>AME>PME ( Fig. 8 View FIGURES 7–13 ), size of eye tubercles: ALE ≈ PLEŻPME>AME. Chelicerae small (length approx. 0.32) with small fangs and wide promarginal area with numerous short, massive, peg-like setae ( Figs 10 View FIGURES 7–13 , 15 View FIGURES 14–19 ). Labium triangular and acute with individual setae, length 0.22, width 0.14; maxillae with dense scopula on proximal end, length 0.33; width of labium + maxillae 0.48. Sternum heart-shaped ( Fig. 9 View FIGURES 7–13 ), rounded with broad, undivided posterior end (nearly half the width of the sternum) ( Fig. 16 View FIGURES 14–19 ), widest at one third of its length, width ratio of its widest part to the width of posterior end 2.31, covered with plumose setae, most numerous on the margins; whole area raised with considerably convex margins and a plain central part, integument reticulate with alveolate and elongated small cavities ( Fig. 16 View FIGURES 14–19 ), most rugous on margins; length 0.62, width 0.49. Legs with a pair of dentate claws and reticulated integument comprised of wrinkles and small cavities; all tarsi with ventral scopulae, patellae with slit-like sensillae organs ( Fig. 25 View FIGURES 23–28 ), similar to those in Porropis flavifrons L. Koch, 1876   (Szymkowiak unpublished); leg formula: II-I-IV-III.

Length of leg segments in females of Bomis larvata   :

Opisthosoma wider than long, shape plano-concave in most specimens ( Fig. 6 View FIGURES 1–6 ) or globular (female, NHML 1915.3.5.3344–46)—possibly the side-effect of long preservation ( Fig. 2 View FIGURES 1–6 ); dorsum having an apodeme pattern of 1- 2-2 ( Fig. 7 View FIGURES 7–13 ), with distance between anterior apodeme and the intermediate pair of apodemes less than twice the distance between intermediate and posterior pair of apodemes ( Fig. 18 View FIGURES 14–19 ), surface of integument highly wrinkled ( Fig. 18 View FIGURES 14–19 ), lateral and posterior part with significant folds ( Fig. 7 View FIGURES 7–13 ), integument covered by tiny spiniform setae, spinnerets recessed in a rounded cavity, circled by numerous setae. Epigyne small ( Figs 5 View FIGURES 1–6 , 11 View FIGURES 7–13 ), nearly rounded, width (0.3) slightly greater than length (0.25) ( Figs 5 View FIGURES 1–6 , 12 View FIGURES 7–13 , 19 View FIGURES 14–19 ); two longitudinal outlines of insemination ducts and spermathecae not adhering to each other ( Figs 5 View FIGURES 1–6 , 13 View FIGURES 7–13 ), insemination ducts short, running without deviation towards spermathecae ( Fig. 12 View FIGURES 7–13 ); vulval structures with two disjointed sac-like spermathecae ( Figs 12–13 View FIGURES 7–13 ), oval in shape. The prosoma is dark brown laterally with light brown stripes in the central part ( Figs 1, 6 View FIGURES 1–6 ); the eyes (ALEs, PLEs, PMEs) are dark, except the AMEs which are light-colored; chelicerae, palps and legs light brown, opisthosoma marbled lighter proximally and darker distally, with blackish paths around the posterior pair of apodemes; a white, transverse stripe extends below the intermediate pair of dorsal apodemes ( Figs 6–7 View FIGURES 1–6 View FIGURES 7–13 ); the margins of the opisthosoma have elongated white-grey stripes which run parallel towards the spinnerets; opisthosoma ventrally plain, epigyne pale.

Male: Body length: 1.38–2.28 (mean 1.83, SD±0.4, n=6), prosoma length: 0.7–1.25 (mean 1, SD±0.18, n=8), prosoma width: 0.72–1.19 (mean 0.99, SD±0.18, n=8), prosoma height: 0.38–0.76 (mean 0.61, SD±0.14, n=6), prosoma length/width ratio: mean 1 (n=8), opisthosoma length: 0.8–1.51 (mean 1.14, SD±0.22, n=8), opisthosoma width: 0.92–1.62 (mean 1.34, SD±0.26, n=8), opisthosoma height: 0.68–1.08 (mean 0.89, SD±0.17, n=6), opisthosoma length/width ratio: mean 0.86 (n=8). The prosoma’s length is equal to its width and it is covered by numerous tubercles ( Figs 20 View FIGURES 20–22 , 23 View FIGURES 23–28 ). Clypeus long (0.2–0.39), ratio of clypeus length/AME-AME 2 (1.91–2.22, n=2), clypeus margin shape as in female ( Fig. 24 View FIGURES 23–28 ). Dimensions of eyes and eye tubercles nearly equal to their female counterparts (PMEs smallest), x/y ratio 0.75, diameter of lenses ALE>PLE>>AME>PME, size of eye tubercles ALE=PLE>PME>AME. The legs (tibiae in particular) are covered by different types of setae: baciliform, spiniform, and setiform with different types of setae surfaces (mostly squamous and spiculate) and various types of setae ornamentation (mostly ciliate) ( Fig. 26 View FIGURES 23–28 ), legs densely covered by trichobothria (long, fine, curved hairs) ( Fig. 26 View FIGURES 23–28 ), leg surface rugose ( Fig. 26 View FIGURES 23–28 ), patellae with distinct slit-like sensillae ( Fig. 25 View FIGURES 23–28 ), leg formula II-I-IV ≈ III. Other parts of the body and appendages are as described for the female above. The cymbium has a cymbial notch in distal position on retrolateral side ( Fig. 28 View FIGURES 23–28 ) and the whole surface covered by plumose setae and individual smooth, baciliform setae on top.

Distribution. The Australian species is known from Queensland, New South Wales and Western Australia.

Habitat preferences. The species was often found in litter or in herbal vegetation in woodland (riparian forest).

NMW

Naturhistorisches Museum, Wien

QM

Queensland Museum

NHML

Natural History Museum, Tripoli

ZMB

Museum für Naturkunde Berlin (Zoological Collections)

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Thomisidae

Genus

Bomis

Loc

Bomis larvata L. Koch, 1874

Szymkowiak, Paweł & Królikowska, Sylwia 2017
2017
Loc

Bomis larvata L. Koch, 1874: 528

Simon, E. 1895: 1005
Koch, L. 1876: 798
Koch, L. 1874: 528
1874