Other formats

    Adobe Portable Document Format file (facsimile images)   TEI XML file   ePub eBook file  

Connect

    mail icontwitter iconBlogspot iconrss icon

Zoology Publications from Victoria University of Wellington—Nos. 66 and 67

Hypogastrura viatica (Tullberg, 1872) — Achorutes murorum (Bourlet, 1843) (Tullberg, 1869) — Achorutes viaticus Tullberg, 1872 — Achorutus titahiensis Salmon, 1943 — Achorutus subviaticus Bagnall, 1947 — Achorutus pseudoviaticus Bagnall, 1947

Hypogastrura viatica (Tullberg, 1872)
Achorutes murorum (Bourlet, 1843) (Tullberg, 1869)
Achorutes viaticus Tullberg, 1872
Achorutus titahiensis Salmon, 1943
Achorutus subviaticus Bagnall, 1947
Achorutus pseudoviaticus Bagnall, 1947

Tullberg's (1872, pl.10, Figs. 7-20) original description of this species is beautifully illustrated, and further illustrations were given by Stach (1954, pls. iii, X) when he redescribed this species. Bagnall (1941, p.220) stated that the true viaticus of Tullberg had a tenaculum with four barbs and he set up two new closely related British species (A. subviaticus and A. pseudoviaticus) for forms he had discovered with only three barbs to each ramus. In 1943 (p.376) I described a new species A. titahiensis from New Zealand with three barbs to each ramus. Bagnall also stated that the papillae of the anal spines were contiguous basally whereas in his two new species these structures were more or less separated. In A. titahiensis these structures are variable and the anal papillae may be either continguous or separated. Stach (1949) in his redescription of A. viaticus records the rami of the tenacalum as each having three barbs and the anal papillae as being contiguous basally. He suggests that Bagnall's two species are synonyms of A. viaticus, a synonomy with which I would now agree.

I have examined a large series of specimens of A. viaticus at BMNH from various parts of the world and find that the papillae of the anal spines may be touching at their bases or close together but not widely-separated. The variations may occur amongst individuals from the same locality. The anal spines themselves vary considerably in length from very short (about 1/6 of hind claw) to quite long (about half length of hind claw). They may be straight but are normally slightly curved. One specimen from Dublin has two spines on one side of the body arranged one behind the other, and only one spine on the other side.

The tenaculum normally has only three barbs to each ramus but occasional specimens do occur with four barbs to each ramus. One specimen examined from Bear Island had four barbs on one ramus and three on the other.

Re-examination of my A. titahiensis type material convinces me that this is simply a further, perhaps extreme, variation of A. viaticus Tullberg.

In the BMNH collections there are some specimens labelled A. murorum and presented to the museum by Lubbock in 1884 from material sent to him by Tullberg. After examining these I consider them identical with A. viaticus Tullberg, 1872.

page 34
Figs. 158-163 Hypogastrura purpurascens galiciana (Boerner), drawn from type and cotypes in BMNH.page 35

Figs. 158-163 Hypogastrura purpurascens galiciana (Boerner), drawn from type and cotypes in BMNH.

Fig. 158 fore foot × 400 from type BMNH
Fig. 159 hind foot × 400 from type BMNH
Fig. 160 mucro apex of dens × 400 from type BMNH
Fig. 161 PAO × 1000 from type BMNH
Fig. 162 PAO and adjacent ocellus from cotype BMNH
Fig. 163 anal spine and setae from side × 400 from cotype BMNH

Figs. 164-171 Hypogastrura (Cyclograna) boletivorus (Packard), drawn from paratype of Cyclograna vulgaris.

Fig. 164 PAO surface appearance × 2000
Fig. 165 PAO deep appearance at base of organ × 2000
Fig. 166 SO Ant III × 2000
Fig. 167 apex Ant IV × 2000
Fig. 168 hind foot × 600
Fig. 169 mucrodens from side × 600
Fig. 170 mucrodens angled view × 600
Fig. 171 anal spine and associated setae × 600