Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 70, 1940-41
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Genus Tomocerus Nicolet, 1841.

Ocelli, six on each side. Clavate tenent hairs well developed. Dentes spined, mucrons long and clothed with setae.

The occurrence and arrangement of the dental spines is of great importance in the diagnosis of species, and is expressed as a formula wherein large spines are shown as a number in bold type and small spines in lighter type. The dens usually is segmented and where the suture of a segment interrupts the series of spines an oblique line is shown. Variations in the numbers of spines are shown by hyphens.

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Two species occur in New Zealand, one of which is a well-known European form.

Key to the New Zealand Species of Tomocerus.
1. Claw with 5–7 equal inner teeth and single clavate, spined tenent hair. Dental spines 4–8/2–8, I, 1–2, I. T. minor Lubbock
2. Claw with one large and five smaller inner teeth, one clavate and spined tenent hair, one non-clavate tenent hair, and dental spines 2–3, I, 2–3, I, 1, I/o. T. setoserratus sp. nov.

Tomocerus minor Lubbock, 1862. Plate 56, figs. 281–282.

Colour: Lead coloured with scales, but without scales varying from yellow to almost black. Yellow forms often with lateral black mottling.

Clothing: Heavily clothed with typical ribbed and striated scales.

Body: Length to 4 mm. Antennae shorter than body, with basal segment yellow and the others purple.

Legs: Claw with 5–7 small inner teeth, and two lateral external basal teeth. Empodial appendage half as long as claw with single small tooth. A single clavate and spined tenent hair shorter than claw to each foot.

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Furcula: Dental spines tridentate. 4–8/2–8, I, 1–2, I. Mucro with apical, longer sub-apical, paired unequal basal teeth and from 5–10 small intermediate teeth.

Locality: Ross, South Westland, in and under old logs.

Tomocerus setoserratus sp. nov. Plate 56, figs. 276–280.

Colour: In life, grey; mounted and with scales, grey over a basal colour of yellow; denuded of scales, yellow with black mottling along sides of body. Legs and furcula dirty yellow, tibio-tarsi pale violet. Antennae, I yellow, II grey, III and IV bluish-grey.

Clothing: Heavily clothed with longitudinally-ribbed, transversely-striated scales and occasional plain setae, which are most prevalent around posterior region of abdomen and on legs and furcula.

Body: Length up to 3·5 mm. Antennae shorter than body, four-segmented, the segments related as 8: 12: 42: 19. Ant. III and IV annulated. Ocelli six to each side, all large. Tergum of mesothorax completely covers prothorax. Ventral tube short and swollen distally. Abd. III longer than Abd. IV as 11: 7.

Legs: Claw with six inner teeth, one of which is large and situated at basal end, and five others of medium size arranged equally spaced in line; two outer lateral basal teeth and six basal folds. Empodial appendage lanceolate, about half as long as claw, and with long, thin inner tooth at about one-third from base. A single strong clavate and spined tenent hair to each foot, and immediately above it an equally strong non-clavate tenent hair.

Furcula: Manubrium to dens to mucro as 23: 28: 6. Dens three-segmented, but sutures very ill-defined. Dental spines large and tridentate, the formula being 2–3, I, 2–3, I, 1. I/o. In addition, last segment of dens bears along its whole length two rows of strongly serrated setae down one side, exactly similar to serrated setae of Acanthomrus Wom. Mucro heavily clothed with setae, with an

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apical tooth, a very large sub-apical tooth, 5–7 smaller intermediate teeth, and large paired basal teeth. The numbers of intermediate teeth may vary between the two mucrones of the same individual.

Locality: Lake Brunner, in old logs.

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Type: Slide, 3/639, Dominion Museum Collection.

This species is somewhat similar to T. minor Lubb., from which it differs in the formula for the dental spines, the presence of serrated setae on the dens, in the dentition of the claw and empodial appendage, and in the arrangement of tenent hairs.