Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 70, 1940-41
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Tribe Isotomini Börner, 1913.
Genus Acanthomurus Womersley, 1934.

Species similar to Isotomurus, but dentes bearing ventrally numerous slightly curved setae that are strongly serrated down one side, and all setae of body strongly ciliated.

This genus was erected for a single Australian species, A. plumbeus Wom., from which only up to the present it has been known. I now add three new species and a new subspecies from New Zealand.

Key to the New Zealand Species of Acanthomurus.
1. Plump species, body strongly flexed, with head much deeper than long. Body dorsally with many exceedingly long setae, much longer than any other body setae. Colour yellow with dark markings on sides. Post-antennal organ, narrow, elliptical, and about as long as an ocellus A. alpinus sp. nov.
Body not plump, but normal, not so strongly flexed. 2.
2. Dorsal setae not very much longer than other body setae. Colour yellowish below, dark brown to violet dorsally. A. womersleyi sp. nov.
Dorsal setae exceedingly long—longer than depth of body 3.
3. (a) Colour variable from greenish to yellow or orange-brown with bluish intersegmental bands and patches. Clothing of short ciliated setae and many exceedingly long setae. A. setosus sp. nov.
(b) As above, except that the whole of the ventral surface is coloured a deep-blue or violet. A. setosus subsp. violaceus nov.

Acanthomurus alpinus sp. nov. Plate 50, figs. 169–174.

Colour: In life, yellow with black markings on sides. Mounted specimens are ochreous yellow with a small irregular violet patch on the side of each segment near dorsal surface. On Abd. V a violet patch on the side near ventral surface and occasional patches of violet may occur along ventral edges of pleura. Legs and furcula yellow, tibio-tarsi sometimes pale violet. Antennae pale brown with violet joints and Ant. IV all violet. Ocelli on very large black pigment patches.

Clothing: Thickly clothed with short and occasional long ciliated setae. Along dorsal surface these setae are relatively enormous and longer than the depth of the insect's body. Bothriotrichia occur on Abd. III and Abd. IV. Appendages thickly clothed with ciliated setae, legs carrying many very long such setae.

Body: Strongly flexed and more plump than generally the case in Collembola. Length of body 1·4–2·7 mm. Antennae twice as long as head, the four segments related as 9 : 12 : 11 : 14. Head much deeper than long. Ocelli eight to each side, six very large and two, the posterior inner two, exceedingly small. Several short setae arise within area of ocellar group. Post-antennal organ very narrow, elliptical, and slightly longer than diameter of an ocellus. Ventral tube, long, cylindrical; Abd. III and IV sub-equal.

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Legs: Claw with two inner teeth, one about half-way, the other just past three-quarters down from claw base, and a pair of exterior lateral teeth on outer edge. Empodial appendage reaching beyond distal tooth with broad inner and outer lamellae, inner with a large tooth on its forward edge. Inner lamella tapers more rapidly than outer. A small seta arises on each side of base of claw. Two slender non-clavate tenent hairs to each foot.

Furcula: Dens with a double row of serrated spines, stout and straight at base but becoming more slender and slightly curved towards mucro. Mucro with four teeth, a large apical and a larger sub-apical tooth, a smaller central tooth and a still smaller exterior lateral tooth. Furcula thickly clothed with short ciliated setae. Dens: mucrodens as 12:29.

Localities: Arthur's Pass, in beech forest above 2,500 ft. amongst leaf debris; at 3,000 ft. under stones and moss in alpine meadow; Lewis Pass Saddle, 3,100 ft. in leaf debris in bush; South Westland, under stones at Rocky Creek, near Weheka; Alex Knobb, Waiho, 3,000 ft. in leaf debris; Haast Pass summit, in old logs; Lake Gunn, Eglinton Valley, under beech bark.

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Type: Slide 3/464 and Figured Paratype: Slide 3/466, Dominion Museum Collection.

Acanthomurus womersleyi sp. nov. Plate 50, figs. 175–176.

Colour: In life, translucent ochreous brown; mounted, yellow-ish-brown to light brown, with sometimes isolated patches of violet along sides. Top of head and of each segment dark brown to brown-ish-violet. Legs and antennae pale to deep violet or violet-brown with tips of antennae deep blue-violet. Furcula brown.

Clothing: Densely clothed all over with moderately long and stout dark brown, finely-ciliated setae which are longer and more prominent on top of head and along dorsal surface. Generally, two very long backwardly-curved, strongly-ciliated setae on Abd. V dorsally. These may be male characters. Short sensory hairs present on Abd. IV dorsally and Abd. III laterally. Antennae thickly clothed with short, finely-ciliated setae, furcula with longer ciliated setae, legs with ciliated setae and occasional long ciliated hairs.

Body: Length 1·25 mm. Head diagonal almost equal to thorax in length. Antennae short, four-segmented, segments related as 5:9:9:12. Ocelli on very large black pigment patches, eight to each side, six large and two, the posterior inner two, extremely small and almost invisible. Postantennal organ long and elliptical. Ventral tube moderately long, cylindrical. Abd. III typically one and a-half times as long as Abd. IV.

Legs: Claw with single small outer tooth about one-third down claw from base, one small inner tooth about middle of inner edge, and another smaller one at three-quarters. Empodial appendage lanceolate with broad inner and outer lamellae, outer reaching to apex, inner to about two-thirds and having on its forward edge a small, blunt tooth. No tenent hairs.

Furcula: Manubrium: dens as 12:27. Dens with row of long, stout serrated spines, serrated on one side only, reaching about half-way, and at least one full-length row of serrated setae. Dens lightly

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corrugated. Mucro with four teeth, an apical, two inner teeth larger than apical, and small exterior lateral tooth. Mucro not surrounded by setae, and more elongate than in A. alpinus.

Localities: Akatarawa, in bush soil; Bullock Creek, South West-land, under wet moss and lichen on a steep bank.

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Type: Slide 3/456, Dominion Museum Collection.

I have much pleasure in naming this species womersleyi after the founder of the genus.

Acanthomurus setosus sp. nov. Plate 49, figs. 161–164.

Colour: Very variable; in life, greenish to orange-brown. Mounted specimens show ground colour of brownish-orange becoming yellowish or greenish on ventral surface. Generally, a small dorsal intersegmental band of blue pigment between all segments except 4–5 and 5–6, and patches of blue or violet pigment on sides of thorax, particularly about bases of legs and on sides of Abd. II, III, V, and VI. Basal segments of legs and tibio-tarsi blue or violet, femora brownish. Antennae I and II brownish to greenish-yellow with central patches of violet; Ant. III and IV deep violet to black. Furcula pale brown to greenish-brown. Ocelli on black pigment patches.

Clothing: Densely clothed with short, ciliated setae and many specimens (probably the males) are adorned with enormous setae which frequently are longer than the width of the insect's body. These setae occur on the head and all over the body, reaching their greatest development on Abds. III and IV and on tibio-tarsi. Antennae clothed with very short ciliated setae and on Ant. IV, mingled with these many fine plain short sensory setae. Bothriotrichia occur on Abd. II (one dorsal), Abd. III (two lateral), and Abd. IV (two lateral).

Body: Length 2·5 mm. Antennae twice as long as head, the four segments related as 11:20:17:18. Ocelli eight to each side, posterior inner two very small, six remaining ones all large. Post-antennal organ oval, smaller than an ocellus and double-outlined. Ventral tube long and cylindrical, swollen distally, Abd. III longer than Abd. IV as 27:22.

Legs: Claw with two small inner teeth, one at middle and one at three-quarters and two outer lateral teeth a little above middle. Empodial appendage two-thirds as long as claw, sharply pointed, with broad outer lamella reaching to tip, and smaller inner lamella supplied with a long, thin tooth on its forward edge. A single, short, slender, non-clavate tenent hair to each foot.

Furcula: Manubrium: mucrodens as 5:13. Dens with single ventral row of stout, dark-coloured serrated spines on basal half and four rows of more slender serrated spines reaching to mucro. Whole dens in addition thickly clothed with short, ciliated setae. Mucro with four teeth, apical tooth, very large sub-apical tooth, large central tooth, and smaller exterior lateral basal tooth. Mucro protected dorsally by stout ciliated seta.

Locality: Lake Manapouri, under stones on the edge of the lake.

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Type: Slide 3/458 and Figured Paratype: Slide 3/459, Dominion Museum Collection.

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Acanthomurus setosus subsp. violaceus nov.

A subspecies in which the whole of the lower (ventral) half of the body is coloured a deep blue or violet, with a sharp horizontal line of demarcation about half-way down the side of the body.

Locality: Lake Manapouri, under stones by the edge of the lake.

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Type: Slide 3/462, Dominion Museum Collection.