Arvechambus hummi Causey, 1963

Shelley, Rowland M., 2007, Rediagnoses of the milliped genera Pseudojulus Bollman, 1887, and Arvechambus Causey, 1963, in the southeastern USA; description of P. mississippiensis, n. sp. and proposal of the subtribe Pseudojulina (Julida: Parajulidae: Parajulinae: Aniulini), Zootaxa 1541, pp. 1-16 : 12-13

publication ID

https://doi.org/ 10.5281/zenodo.177842

DOI

https://doi.org/10.5281/zenodo.6244638

persistent identifier

https://treatment.plazi.org/id/BA6D766A-A571-864F-03FB-FC43FEE9A7F6

treatment provided by

Plazi

scientific name

Arvechambus hummi Causey, 1963
status

 

Arvechambus hummi Causey, 1963 View in CoL

Figs. 14–17

Arvechambus hummi Causey, 1963:69 View in CoL –70, figs. 1–3, 9. Hoffman, 1999:149. Shelley, 2001:243; 2004:202–203, figs. 29– 43.

Arvechambus australis Causey, 1963:71 View in CoL , figs. 4–6. Hoffman, 1999:149. Shelley, 2001:243.

Type specimens. Of A. hummi : ɗ holotype ( NMNH) and 2ɗ & 1Ψ paratypes ( FSCA, NMNH) collected by H. J. Humm on an unknown date in October or November 1952 in Tallahassee, Leon Co., Florida; 1ɗ & 4Ψ paratypes ( FSCA) collected in Tallahassee by "Ecology Class", November-December 1952; and 1ɗ paratype ( NMNH) collected by R. McFarland, 26 October 1958, 4 mi (6.4 km) S Tallahassee. Of A. australis : ɗ holotype ( NMNH) collected by H. V. Weems, Jr., 20 December 1959, in Gainesville, Alachua Co. , Florida; paratypes, all from Gainesville and collected by W. J. Platt, as follows: 1ɗ ( FSCA) and 1Ψ ( NMNH), 28 October & 22 November 1959, respectively, "on floor in house," 1Ψ ( FSCA), 17 October 1959, "on top of ground in creek ravine area" ( Causey 1963, Hoffman 1999, Shelley 2004).

Diagnosis. Posterior gonopod accessory prefemoral process extending directly ventrad, not overlapping telopodite, expanding at 1/3 length and distally broad, apically sublinear with tooth at caudal corner.

Distribution. Published records exist from Alachua, Baker, Hamilton, Leon , & Liberty cos., Florida, and Thomas Co., Georgia ( Causey 1963; Hoffman 1999; Shelley 2001, 2004); the following new records are available. FLORIDA: Alachua Co. , 5 mi (8 km) S Hawthorne, W side of Lochloosa Lake, ɗ/Ψ (gynandromorph), 11 November 1976, L. R. Davis (FSCA); Gainesville, 1911 SW 34th St, inside Division of Plant Industry Bldg., ɗ, 17 December 1987, A. B. Hamon (FSCA); and 4 mi (6.4 km) E Gainesville, "bait traps," ɗ, 1–19 November 1965, R. E. Woodruff (FSCA). Suwannee Co., 4.3 mi (6.9 km) S Dowling Park, in "pig dung trap" along Suwannee River, ɗ, 20 October 1976, J. R. Wiley (FSCA). Wakulla Co. , 1 mi (1.6 km) S Medart, along US hwy. 98 in Panacea Unit, St. Marks Nat. Wildlife Ref., 2ɗ, 16 March 1978, collector unknown (FSCA).

Remarks. The FSCA contains a specimen from Lochloosa Lake, Alachua Co. (Figs. 14–17), that is a gynandromorph possessing both gonopods and cyphopods; I assign it to A. hummi even though it lacks lobes on the 8th sternum. The reproductive structures are at their proper positions but are aberrant as are the tures and exoskeletons at these locations (see Shelley 2004, figs. 29–30, 42)). Identification is therefore lematical, but only two parajulids occur in this area — Gyniulus bufonius (Chamberlin, 1938) and A. — and the milliped seems too large to be the former; additionally, the bilobed gynaspis is amenable to condition in A. hummi (see Shelley 2004, figs. 43–45).

FIGURE 14. Gynandromorph of Arvechambus hummi from Alachua Co. , Florida, head and rings 1–10, lateral view of right side. The Ψ cyphopods are inside the aperture with the raised margins behind the 1st legs, and the ♂ gonopods are located caudad on ring 7; the right posterior gonopod protrudes through the aperture and is visible externally. Photo by A. E. Bogan.

The ags ( Fig. 15 View FIGURES 15 – 17 ) are non-descript and immature-looking, with an elongate, non-clavate telopodite and a broad coxa that continues into a large medial lobe; the conditions of these structures plus the absence of the lateral syncoxal process are compatible with A. hummi and not G. bufonius . The shape of the pgs ( Fig. 16 View FIGURES 15 – 17 ), with a broad, basally concave telopodite and a small additional branch arising at the position of a true prefemoral process, does not resemble anything that I have seen; however, the truncated telopodite is consistent with A. hummi . Likewise, the cyphopods ( Fig. 17 View FIGURES 15 – 17 ) do not resemble those of either species and possess a receptacle-like structure that nearly envelopes the valves; however, the bilobed gynaspis is consistent with A. hummi and not G. bufonius . There are no eggs inside the body, and as malformed as the structures are, they must all be non-functional. To the best of my knowledge, this is the first report of a gynandromorphic parajulid; Verhoeff (1910) described an individual of Tachypodoiulus niger (Leach, 1815) ( Julida : Julidae ) from Germany, with cyphopods, ovaries, penes, vasa deferentia, and gonopod primordia replacing both pairs of legs on segment 7. Most gynandromorphic conditions in the Diplopoda that I am aware of have been reported for representatives of the Polydesmida, and readers are referred to the works of Brölemann (1898, 1920), Carl (1911, 1914), and Chalande (1903).

NMNH

Smithsonian Institution, National Museum of Natural History

FSCA

Florida State Collection of Arthropods, The Museum of Entomology

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Julida

Family

Parajulidae

Genus

Arvechambus

Loc

Arvechambus hummi Causey, 1963

Shelley, Rowland M. 2007
2007
Loc

Arvechambus hummi

Shelley 2001: 243
Hoffman 1999: 149
Causey 1963: 69
1963
Loc

Arvechambus australis

Shelley 2001: 243
Hoffman 1999: 149
Causey 1963: 71
1963
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