Arachnids of North Carolina
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Trebacosa marxi - a wolf spider

Trebacosa marxi
Taxonomy
Order: ARANEAEInfraorder: AraneomorphaeFamily: Lycosidae                                                                                 
Identification
Online Description/Photos: BugGuide Google, iNaturalist, Wikipedia, GBIF
Comments: Male with indistinct, wide submarginal light band and tuning-fork mark that is broken up into paired segments (Fig . 199). General body color in alcohol amber. Dorsum with distinct light-colored hastate mark bordered by black V-shaped mark which is bordered by light-colored converging stripes . Coxae, labium , sternum and endites without markings, venter with a little scattered pigment. Anterior eye row narrower than the posterior median row slightly procurved ; anterior median eyes a little larger than the anterior laterals, closer to each other than to th e laterals. Height of the clypeus twice the diameter of an anterior median eye . Lower margin of the furrow of the chelicerae with two teeth . Legs 4123, without annulae . Tibiae I and II with three pairs of ventrolateral spines, th e distal pair apical in position, each with an additional prolateral spine about halfwa y between the middle and apical pairs. The prolateral spine of the proximal pair on tibia I barely overlaps the middle spine . The prolateral spines of the proximal and middle pairs on tibia II are reduced to about half the size of their mates . Description of female.—From Ramsey, New Jersey, July 11, 1948, W . Ivie (A .M .N.H.). Carapace 3 .5 mm long, 2 .7 mm wide, with a rather indistinct submarginal light band and . . a narrow, light streak extending forward from the cervical groove to between the posterior lateral eyes (Fig . 200). For dorsum see the figure . Coxae, labium, endites and sternum without pigment . Anterior eye row narrower than the posterior median row, slightly procurved ; anterio r median eyes about half again as large as the anterior laterals ; anterior median eyes close r to each other than to the laterals. Height of the clypeus equal to the diameter of an anterior median eye . Lower margin of the furrow of the chelicerae with two teeth, th e largest near the base of the fang.
Total Length: Male carapace 3 .2 mm long, 2 .4 mm wide, female carapace 3 .5 mm long, 2 .7 mm wide.
Distribution in North Carolina
Comments: Eastern half of the United States and Canada ; south into Florida
County Map: Clicking on a county returns the records for the species in that county.
Trebacosa marxi
Adult phenology:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Habitats and Life History
Habitats: wet swampy shady areas, damp old fields
Observation Methods:
Abundance/Frequency: Rare, two broods in northern areas. No records of adults from January, February or March ; then both sexes for the next four months; no adults in August or September ; males are present in October, and both sexes in November and December . The only egg sacs records are from July .
Status in North Carolina
Natural Heritage Program Status:
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State Protection:
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 Photo Gallery for Trebacosa marxi - a wolf spider

Photos: 4

Recorded by: Carol Tingley on 2021-09-21
Durham Co.
Comment: 		Recorded by: Carol Tingley on 2021-09-21
Durham Co.
Comment:
Recorded by: Carol Tingley on 2021-05-23
Durham Co.
Comment: 		Recorded by: Carol Tingley on 2021-05-23
Durham Co.
Comment: