Willowsia jacobsoni ( Börner, 1913 )

Katz, Aron D., 2017, A new endemic species of Willowsia from Florida (USA) and descriptive notes on all New World Willowsia (Collembola: Entomobryidae), Zootaxa 4350 (3), pp. 549-562 : 552

publication ID

https://doi.org/ 10.11646/zootaxa.4350.3.7

publication LSID

lsid:zoobank.org:pub:3724CA0C-9CDF-4898-8373-BFA4C8BA9AC0

DOI

https://doi.org/10.5281/zenodo.6046151

persistent identifier

https://treatment.plazi.org/id/03E58E29-FFF4-FF9C-9EF6-FDBC4403F9AF

treatment provided by

Plazi

scientific name

Willowsia jacobsoni ( Börner, 1913 )
status

 

Willowsia jacobsoni ( Börner, 1913)

Figs 3, 4 View FIGURES 1 – 4 , 11 View FIGURES 5 – 14 , 16 View FIGURES 15 – 19

Material examined. USA: Puerto Rico, Aguada, Coloso Sugar Cane Mill , on sugar cane litter, 16.vi.1999, F. Soto- Adames, 2 on slides ( INHS 810,148–810,149 ) ; Puerto Rico, Aguada, Coloso Sugar Cane Mill , on sugar cane litter, 17.vi.1999, F. Soto-Adames, 4 females, 2 (1 male) on slides ( INHS 810,150–810,155 ), 15 in ethanol ( INHS 810,156 View Materials ) .

Complement to description based on American specimens. Habitus as in Figs 3 and 4 View FIGURES 1 – 4 . Scales long basal rib type ( Fig. 11 View FIGURES 5 – 14 ) and absent on antennae, legs, and furcula. Dorsal chaetotaxy of the head as in Figure 16 View FIGURES 15 – 19 : row An with 6 mac; anterior mac A0, A2, A3, A5 present; 3+3 median mac, M1, M2, M4 present, M3 always absent; 4+4 sutural mac, S2, S3, S4, S5 present, S6 as mic; post-sutural mac Ps5 absent. Outer maxillary lobe with 3 sublobal hairs. Prelabral setae ciliate. Labral papillae each with multiple seta-like projections. Labial triangle as MrEL1L2A1–5, r always present. Lateral process of labial palp straight, blunt, reaching tip of labial papilla E. Cephalic groove with 5+5 ciliate setae. Th. II without median mac and 2+2 posterior mac. Abd. I with 1+1 mac.

Ecology. This species occurs in leaf litter, and is abundant in agroecosystems such as sugar cane fields and banana leave axils.

Distribution. Pantropical, including Hawaii and Puerto Rico.

Remarks. Willowsia jacobsoni is the only member of the genus with the following combination of characters: color pattern as in Figs 3 and 4 View FIGURES 1 – 4 ; long basal rib type scales ( Fig. 11 View FIGURES 5 – 14 ); scales absent on antennae, legs, and furcula; labral papillae with multiple projections; prelabral setae ciliate; labial triangle seta r present ; outer maxillary lobe with 3+3 sublobal hairs; dorsal head with 3+3 median mac, 4+4 sutural mac, mac S0 and Ps5 absent ( Fig. 16 View FIGURES 15 – 19 ); Th. II with 0+0 median mac and 2+2 posterior mac; Abd. I with 1+1 mac; Abd. II with 2+2 inner mac; Abd. III with 2+2 inner and 3+3 lateral mac; and Abd. IV with 5+5 inner mac.

In scale morphology and scale distribution, this species is very similar W. buski and W. nigromaculata : they all have long basal rib type scales that are absent on the antennae, legs, and manubrium. However, W. jacobsoni can be differentiated from W. buski and W. nigromaculata by color pattern and head and body chaetotaxy: head mac Ps5 is absent in W. jacobsoni (present in W. buski and W. nigromaculata ) and W. jacobsoni has 3+3 inner mac on Abd. III ( W. buski and W. nigromaculata have 2+2). See Table 1 for additional diagnostic characters.

The material observed for this study is in general agreement with Mari Mutt’s (1981) detailed morphological description, except Th. II mac a5 is incorrectly labeled as m 4 in Mari Mutt (1981).

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