Readers of this blog may be familiar with the story of Cicindela floridana, a beautifully iridescent tiger beetle presumed extinct but rediscovered in 2007. This beetle is only known from pine rocklands, a habitat once common in southern Florida but only 1.8% of the original rocklands remain today (outside of the Everglades National Park).
Frank N. Young Jr. collected this species while he was an 18 year old student and gives only vague locality information on his labels. In the rediscovery paper Brzoska, Knisley, and Slotten note that:
The exact type locality for var. floridana is problematic. Cartwright (1939) gives the locality as Miami, Florida based on Young’s label. In the 1980s, R. L. Huber, in an attempt to locate this form contacted Young who told him the specimens were collected in the vicinity of Gratigny Road while he was studying land snails in the sandy hammocks. …. Knisley also contacted Young in the early 1990s and learned that the specimens were taken in the vicinity of Barry [University].
My curiosity piqued, I combed through Frank Young’s publications and found a 1951 paper “Vanishing and extinct colonies of tree snails, Liguus fasciatus, in the vicinity of Miami, Florida.” In this paper Young includes a map of his study sites, which are tantalizingly close to Gratigny Road and Barry University (located south of Gratigny St. and Miami Ave). If there is a connection between Young’s early snail hunting and this 1951 paper and we might be able to pinpoint the type locality of C. floridana.
Further on Young writes:
The distribution of the hammocks around Arch Creek shows the same general pattern as those around New River to the north or Little River to the south. That is, the hammocks occur along the margins of the stream or its estuary, across the rocklands of the East Coast ridge, and fan out along the edges of the transverse glade. This pattern is apparently maintained by the nature of the soils and the periodic fires which sweep the bordering rocky pinelands and encroach upon the edges of the hammocks.
This paper suggests that the area around Gratigny Road and Barry University may have been pine rocklands and substantially narrows the potential area in which Young may have collected the type series in 1934. In this 1947 topographic map you can see that the area around (and north of) Gratigny Road and Barry University is slightly elevated from the surrounding, consistent with (but not necessarily indicative of) pine rocklands habitat.
Almost convinced, I searched the aerial photography of Florida collections at the University of Florida Digital Collections and found several index images which included my area of interest. I was unable to find any imagery taken earlier than 1940; however, even the 1940 photograph confirmed my hunch. In this image the land north and west of (what would become) Barry University and Gratigny Road there appears to a partially isolated stand of pines.
This location matches Young’s comments to Huber and Knisley; Gratigny Road runs through these pines which extend into what would become Barry University. But, even in the six years after Young collected the type series of C. floridana there appear to have been significant new development visible (including Barry University, founded in 1940) and the areas east and southeast of the canal are already heavily built up.
This fall I received a note from Knisley, forwarded from Huber, with an exciting message. Huber had found a detailed entry from his collecting notes; this gave an exact location for Young’s specimens:
30 May 1972, visited the intersection of Miami Ave and Gratigny Rd (=119th St). Frank Young said that he had taken floridana in the NE corner of that intersection.
Bingo! Here is the type locality of C. floridana in detail:
The next image (showing the area just north of Gratigny St.) is from 1947 and the pines appear to have been largely cut down and the area has been divided up into parcels. I find it unlikely that C. floridana would have occurred at the type locality in 1947, though perhaps to the west where there appear to still be some pines standing.
The development dramatically increases in 1949-50 and the whole area is largely housing by 1950. Any rocklands habitat that remained after this time was certainly too fragmented and poor quality to sustain a population of C. floridana.
Brzoska, D., C.B. Knisley, and J. Slotten. 2011. Rediscovery of Cicindela scabrosa floridana Cartwright and its elevation to species level. Insect Mundi 2011 162:1-7.
URS Corporation, The Institute for Regional Conservation, and Muller and Associates, Inc. 2007. Miami Dade County Environmentally Endangered Lands Program Management Plan, Part II: Management of specific habitat types, Chapter 1: The pine rockland habitat. Submitted to Environmentally Endangered Lands Program, Miami, Florida by URS Corporation. K.A. Bradley, G.D. Gann, M.J. Barry, contributors.
Young, F. N. 1951. Vanishing and extinct colonies of tree snails, Liguus fasciatus, in the vicinity of Miami, Florida. Occasional Papers of the Museum of Zoology, University of Michigan. 531: 21 p.