Packardesmus cavicola ( Packard, 1877 )

Shear, William A. & Shelley, Rowland M., 2019, Solved after 140 years: the identity of the millipede Polydesmus cavicola Packard, 1877, and proposal of Packardesmus n. gen. (Diplopoda: Polydesmida: Macrosternodesmidae), Zootaxa 4559 (2), pp. 384-390 : 386-387

publication ID

https://doi.org/ 10.11646/zootaxa.4559.2.11

publication LSID

lsid:zoobank.org:pub:A2F6F333-A5F9-40EE-A4FF-60C2647CF07F

DOI

https://doi.org/10.5281/zenodo.5943961

persistent identifier

https://treatment.plazi.org/id/03E187C5-0F74-FFC9-FF78-91B7FDB35275

treatment provided by

Plazi

scientific name

Packardesmus cavicola ( Packard, 1877 )
status

 

Packardesmus cavicola ( Packard, 1877)

Figs 1–7 View FIGURES 1–7 .

Polydesmus cavicola Packard, 1877:161 .

Brachydesmus cavicola — Chamberlin & Hoffman, 1958:64.

Material examined: Type specimen. Female lectotype (MCZ) from Clinton’s Cave, Oquirrh Mountains , near Lake Point Station , Tooele County, Utah, collected by A. S. Packard, summer 1875. Non-type material. A male (described below) and three females were collected by W. R. Bosworth at the type locality on 15 June 2003. The male specimen, on which the description below is based, was dissected and mounted on an SEM stub, and will be deposited along with the females in the collection of the Virginia Museum of Natural History ( VMNH) .

Diagnosis. As is for the genus, see above.

Description. Based on male from Clinton’s Cave. Measurements: Length, 6.0 mm, greatest width, 0.6 mm. Eighteen rings (collum + 15 podous rings + one apodous ring + telson). Head densely and finely setose ( Figs 1, 2 View FIGURES 1–7 ). Antennae ( Fig 1 View FIGURES 1–7 ) relatively long, extending backward to posterior margin of third ring. Antennomeres 2–4 cylindrical, fifth slightly inflated, sixth much enlarged (5 and 6 both with apical accessory sensory areas), seventh pyriform, concealing eighth antennomere bearing usual four apical sensory cones. Base (cardo) of mandibles greatly exceeding width of collum when viewed dorsally ( Fig 2 View FIGURES 1–7 ). Collum ( Fig. 2 View FIGURES 1–7 ) arcuate anteriorly, with nearly straight posterior margin, bearing three rows of seven–eight setae; anterior and posterior rows at anterior and posterior margins of collum. Collum with small posterolateral tooth on each side. Setae of first row on collum long, acute, then becoming shorter, blunter by posterior row. Midbody rings ( Fig. 3 View FIGURES 1–7 ) with paranota bearing four marginal teeth and acute posterolateral corner. Ozopores opening dorsally from distinct calluses ( Fig. 3 View FIGURES 1–7 ). Metazonital setal rows on distinct tubercles, becoming more irregular posteriorly with outermost seta on each side moving to paranotal teeth on more posterior rings. Some setae of rows missing or additional setae present. First row becoming distinctly recurved on rings posterior to collum. Metazonital setae short, clavate, blunt ( Fig. 1 View FIGURES 1–7 ). Pygidium with scattered setae. Gonopods ( Figs 4–7 View FIGURES 1–7 ) set in rimmed, oval aperture. Gonocoxae subhemispherical, flattened mesally, immovable. Prefemur setose, transverse. Telopodite arising at right angle to prefemur, consisting of long stem topped by four acute, curved processes including acropodite and solenomere (s, Fig. 6 View FIGURES 1–7 ) bearing seminal pore (p, Fig. 6 View FIGURES 1–7 ).

Female from Clinton’s Cave (collected in 2003). Length, 6.0 mm, greatest width 0.66 mm. Nineteen rings (collum + 16 podous rings + one apodous ring + telson). Nonsexual characters as in male. Distribution. Known only from the type locality. Etymology. Since the species epithet (Gr., cavicola , “cave-dweller”) is a noun in apposition, its gender does not change with the generic name.

VMNH

Virginia Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Polydesmida

Family

Macrosternodesmidae

Genus

Packardesmus

Loc

Packardesmus cavicola ( Packard, 1877 )

Shear, William A. & Shelley, Rowland M. 2019
2019
Loc

Brachydesmus cavicola

Chamberlin, R. V. & Hoffman, R. L. 1958: 64
1958
Loc

cavicola

Packard, A. S. 1877: 161
1877
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