Eumastigonus distinctior Chamberlin, 1920

Korsós, Zoltán & Johns, Peter M., 2009, Introduction to the taxonomy of Iulomorphidae of New Zealand, with descriptions of two new species of Eumastigonus Chamberlin, 1920 (Diplopoda: Spirostreptida: Epinannolenidea), Zootaxa 2065, pp. 1-24 : 10-12

Eumastigonus distinctior Chamberlin, 1920

Figs. 16–17, 23 .

Eumastigonus distinctior Chamberlin, 1920: 164 . Hoffman 1972: 202, Figs. 1-5 . Mauriès 1983: 258 -259, Fig.. 23.

Types: Holotype 3 (MCZ 4872). – New Zealand, North Island, Days Bay near Wellington, leg. W. M. Wheeler 1914.

Other material studied: 23, 1Ƥ – Wellington, Porirua, 24. Dec. 1951, leg. Galathea Exp., det. Mauriès 1982 ( ZMUC); and 73, 10Ƥ, according to the following new records.

New locality records: New Zealand, North Island, Wellington Region: Days Bay, 120 m, leg. P. M. Johns, 15 Jan. 1964, logs, 23, 1Ƥ ( CMNZ: one male is dissected for SEM: head, 1st and 2nd legpair with penis together, gonopods). Hutt Valley, Silverstream, Keith George Park, 120 m, leg. P. M. Johns, 30 Nov. 1963, mixed broadleaf forest, under logs, 13, 4Ƥ ( CMNZ). Otaki, Te Horo, 25 m, leg. P. M. Johns, 30 Nov. 1963, in Podocarpus halli forest, under logs and stones, 33, 5Ƥ ( CMNZ). Wellington, Whitemans Valley, leg. F. R. Allison, 20 May 1965, in Nothofagus logs, 13 ( CMNZ).

Distribution: New Zealand, North Island, Wellington Region. See Fig. 52 .

Description: The species is properly redescribed and illustrated based on the paratype material ( Hoffman 1972, Mauriès 1983). It is easily recognisable by the slender, bent inner coxal process (cp) of the anterior gonopod ( Fig. 16). As an addition, the narrow ocellarium consists of only 6–8 ocelli in 2(3) rows, and there are 2+2 setae on the paraprocts. Body rings characteristically with dark median stripe on dorsum, composed of a series of subtriangular spots, rest of body and legs lighter.

Female vulva ( Fig. 23 ) shows the typical Eumastigonus characters: disc-shaped, valves and operculum (op) strongly compressed, each valve with pointed tip, anterior with 9–12, posterior with only one or two setae along margin. Apodematic tube and ampulla could not be observed.

Figures

FIGURE 1. Position of Iulomorphidae in the order Spirostreptida according to different authors.

FIGURE 52. New Zealand, North Island, distributions of E. kaorinus (infilled squares), E. distinctior (blank squares), and E. hemmingseni (infilled triangles).

FIGURES 22 – 24. Female vulvae (op = operculum). 22: E. kaorinus from Whangaruru headland, Northland Region, right vulva, anterior view, 23: E. distinctior from Porirua, Wellington Region, Galathea Expedition, 1951 (ZMUC), left vulva, posterior view, 24: E. hemmingseni from Akatarawa, Wellington Region, right vulva, posterior view. Scales 0.5 mm.