Rhodopsalta microdora ( Hudson, (Hudson, 1936)

Bator, John, Marshall, David C, Hill, Kathy B R, Cooley, John R, Leston, Adam & Simon, Chris, 2022, Phylogeography of the endemic red-tailed cicadas of New Zealand (Hemiptera: Cicadidae: Rhodopsalta), and molecular, morphological and bioacoustical confirmation of the existence of Hudson’s Rhodopsalta microdora, Zoological Journal of the Linnean Society 195 (4), pp. 1219-1244 : 1238

publication ID

https://doi.org/ 10.1093/zoolinnean/zlab065

DOI

https://doi.org/10.5281/zenodo.6992897

persistent identifier

https://treatment.plazi.org/id/03FD87FD-FFFF-FFFD-85A2-CBB694B9BE0D

treatment provided by

Plazi

scientific name

Rhodopsalta microdora ( Hudson,
status

 

Rhodopsalta microdora ( Hudson, View in CoL

1936)

(Supporting Information, Figs S4 View Figure 4 , S 7 View Figure 7 , S 8 View Figure 8 )

Rhodopsalta microdora was described by G. V. Hudson as Melampsalta microdora from two female specimens collected at Cape Kidnappers on the NI (see Supporting Information, Supplementary Materials); the smaller of these two syntypes was designated as the lectotype by Fleming & Ordish (1966). No male specimens were discussed by Hudson, who referred to the species as a diminutive version of Kikihia scutellaris Walker, 1850 without mentioning R. cruentata . Dugdale (1972) omitted mention of R. microdora while listing R. cruentata and R. leptomera for his description of genus Rhodopsalta , and Larivière et al. (2010) discussed the uncertainty of the status of R. microdora . In many NZ cicadas, females are substantially different in appearance from males of the same species, and they are generally paler, often lacking well-defined aspects of species-specific coloration commonly observed in males. This has probably contributed to the neglect of Hudson’s taxon.

We examined a large series of Rhodopsalta specimens from Cape Kidnappers, the type location of R. microdora , collected after the description of R. microdora and kept at the National Museum of New Zealand Te Papa Tongariro (also discussed by Larivière et al., 2010). Rhodopsalta microdora and R. cruentata , as here defined, are broadly sympatric in that region (but not R. leptomera ). Our findings suggest that Hudson’s selection of a female syntype series might be attributable to clearer differentiation from R. cruentata in that sex. The male Rhodopsalta specimens from Cape Kidnappers range from larger ones tending to possess a prominent silvery midline stripe, as in R. cruentata , to smaller males with often subtler or nearly absent stripes, as described for Hudson’s female R. microdora specimens, but there is no large break in size to separate the males of the two species, and the silvery pubescence varies considerably throughout the series, perhaps owing to wear. In contrast, the nine female specimens group into two distinct clusters (see Supporting Information, Supplementary Materials), the smaller one with dimensions accommodating those of the R. microdora lectotype and paralectotype, which are also lodged at Te Papa. We provide photographs of the R. microdora lectotype (Supporting Information, Fig. S7 View Figure 7 ), in addition to a comparison of R. cruentata and R. microdora females from the Cape Kidnappers series (Supporting Information, Fig. S8 View Figure 8 ). Therefore, we are confident that the smaller-bodied Rhodopsalta species that we are calling R. microdora , which we have collected from Ocean Beach south of Cape Kidnappers, is indeed Hudson’s species.

We note that the path taken by the Endeavour on its first voyage also helps to show that the R. cruentata lectotype specimen is unlikely to belong to the species we have identified as R. microdora . According to Banks’s journal ( Banks, 1896), on the NI the Endeavour anchored at Poverty Bay, Anaura Bay, Tolaga Bay, Mercury Bay, the Thames River tidal portion and the Bay of Islands. Endeavour then sailed along the northernmost point of NI and down the west coast without stopping until arriving at the Marlborough Sounds (SI) and anchoring at Ship Cove in Queen Charlotte Sound. Although Endeavour circumnavigated the SI, it did so without stopping until it returned to the Marlborough Sounds and anchored in Low Neck Bay, D’Urville Island. Based on our records ( Fig. 2 View Figure 2 ), none of these locations is within the range of the taxon we have identified as R. microdora . We have not surveyed D’Urville Island, but this location lies ~ 50 km north of the nearest known populations of R. microdora , and it was visited by Banks in late March, which is late in the season for that species, based on our records.

Rhodopsalta microdora inhabits drier scrub environments along the eastern sides of NI and SI. We have often found this species singing on matagouri shrubs ( Discaria toumatou Raoul ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Cicadidae

Genus

Rhodopsalta

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