Brachoria electa, CAUSEY, 1955

Marek, Paul E., 2010, A revision of the Appalachian millipede genus Brachoria Chamberlin, 1939 (Polydesmida: Xystodesmidae: Apheloriini), Zoological Journal of the Linnean Society 159 (4), pp. 817-889: 843-844

publication ID

http://doi.org/ 10.1111/j.1096-3642.2010.00633.x

persistent identifier

http://treatment.plazi.org/id/523387B6-6634-1B02-3789-820EBF2560B7

treatment provided by

Valdenar

scientific name

Brachoria electa
status

 

BRACHORIA ELECTA CAUSEY, 1955  

‘THE KENTUCKY RIVER MIMIC MILLIPEDE’

( FIG. 13A–D, FIG View Figure 13 . 40A) Brachoria electa Causey, 1955: 25   . Keeton, 1959: 20. The close similarities mentioned by Keeton (1959) between B. electa   and B. ochra   do not appear to be synapomorphic. Instead, B. electa   is more closely related to B. divicuma   than it is to B. ochra   , and does not warrant subspecific status of the latter.

Diagnosis: Adult males of B. electa   are distinct from other Brachoria species   based on the combination of: Colour. Striped ( Fig. 40A), yellow (2.5Y 8.5/8) metatergal stripes, anterior collum spot, legs (2.5Y 8/12). Exoskeleton. Caudolateral corners, paranota 1–4 rounded, lateral margins angled cephalically. Gonopods. Gonopodal acropodite narrow, half width of tibia on leg pair 9, of uniform width throughout. Prefemur with thin, sharp prefemoral process. Acropodite not bent medially, projecting straight from prefemur. Cingulum well defined, deep ( Fig. 13C View Figure 13 , arrow). Acropodite bent at cingulum cephalically 45°. Arc immediately distal beyond cingulum slightly elbowed. Acropodal apex projecting laterally. Arc projecting straight, not curved, anterolaterally. Acropodal apex bent 90°, with recurved zig-zag apex ( Fig. 13B View Figure 13 ). Note: B. electa   is similar in appearance to B. cedra   in gonopodal form. However, the acropodite of B. electa   projects straight from the prefemur ( Fig. 13A View Figure 13 ), whereas in B. cedra   it is curved out in a C-shaped form ( Fig. 8A View Figure 8 ). The apex of B. electa   has a distinct recurved zig-zag apex ( Fig. 13B View Figure 13 ), where in B. cedra   the apex is simpler and not zig-zagged ( Fig. 8B View Figure 8 ).

Variation: Brachoria electa   is known only from the type locality in Tyrone, Kentucky and one locality in Mercer County. There is some variation in coloration amongst these specimens with one less frequent variant of the common striped morph: small yellow metatergal spots, in addition to the metatergal stripes. Measurements : ♂ (N = 4) BL = 38.27–38.58 (38.43/0.22). CW = 7.00–7.48 (7.25/0.20). IW = 4.41– 5.00 (4.71/0.25). ISW = 1.28–1.52 (1.38/0.10). B10W = 8.69–9.91 (9.35/0.50). B10H = 5.20–6.10 (5.61/0.38). ♀ (N = 3) BL = 38.18–40.25 (38.97/1.12). CW = 7.55–7.75 (7.65/0.10). IW = 5.49–5.60 (5.56/ 0.06). ISW = 1.60–1.70 (1.63/0.06). B10W = 10.33– 10.80 (10.51/0.26). B10H = 6.70–7.50 (7.03/0.42)   .

Description: Male described by Causey (1955); redescribed by Keeton (1959).

Ecology: Brachoria electa   specimens were collected during the day (13:00) from a maple, birch, oak, and tulip poplar forest. Individuals were found in the small valley of Wildcat Creek, which runs into the Kentucky River. One other xystodesmid encountered sympatrically at this locality is A. v. corrugata   , which appears similar in coloration with B. electa   . Note: individuals of B. electa   may easily be confused in the field with A. v. corrugata   because of similarity in colour patterns, but can be distinguished by the presence of the following characters (viewed with a 20¥ loupe): Acropodite with midlength transverse groove, cingulum. Acropodite not circular as in A. v. corrugata   . Acropodite projecting straight from the prefemur, whereas in A. v. corrugata   it is strongly curved out in a circular coil. (Although B. calceata   and B. electa   were both recorded from Tyrone, I have never found them together. It is likely that they co-occur; however, they may have different ecological requirements that preclude them from sharing the same habitat.)

Distribution: Known only from the type locality and one place, 23.76 km south-east in Mercer County, Kentucky, both of which are very close to the Kentucky River. The closest known Brachoria species   , B. calceata   , co-occurs with B. electa   at their type localities.

Material examined: Type specimens. ♂ holotype ( AMNH) from Anderson County, Kentucky, Tyrone, 28.iv.1892 (coll: H. Garman) (vidi). Nontype specimens. Kentucky: 2♂ (SPC000613*: EU127860 View Materials , SPC000617), 3♀ (SPC000618, 19, 23), Anderson County , Tyrone , KY-1510, about 4 rd km south-southeast of junction with US-62, Wildcat Creek (38.02163°N, - 84.83765°W, 184 m), 26.vi.2005, 13:00 (coll: P. Marek). 1♂ ( PMLN0019), Mercer County , Kentucky River bluff, 1.6 km north-east of Shakertown (37.8269°N, - 84.7254°W, 259 m), 1.v.1954 (coll: L. Hubricht) GoogleMaps   .

BRACHORIA ENODICUMA KEETON, 1965  

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Polydesmida

Family

Xystodesmidae

Genus

Brachoria

Loc

Brachoria electa

Marek, Paul E. 2010
2010
Loc

BRACHORIA ENODICUMA KEETON, 1965

Keeton 1965
1965