Georgia River Cruiser Macromia illinoiensis (Selys, 1878) georginaS3S4    
Kingdom Animalia   >   Phylum Arthropoda   >   Class Insecta   >   Order Odonata   >   Family Macromiidae   >   Genus Macromia   

Status:

Georgia River Cruiser (Macromia illinoiensis georgina) is the southern form of the Swift River Cruiser, formerly split as a separate species. This taxon occurs on rivers and creeks on the Eastern Shore, and on the southern coastal plain and piedmont. The two readily intergrade where ranges come into contact in the piedmont, and individuals there may show characteristic of either form (Richard Orr's Dragonflies and Damselflies of Maryland and the District of Columbia). This subspecies is ranked as S3 (watch list) in Maryland.

Description:

Georgia shows half-length yellow antehumeral stripes on thorax (absent on Illinois), and a complete yellow ring on S2 (broadly interrupted dorsally and laterally on Illinois). Yellow markings generally more developed and larger than on Illinois. Male Illinois shows yellow dorsal spots on middle abdominal segments very reduced or absent. Male Illinois shows black auricles (Dunkle, 2000).

There are 53 records in the project database.

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A Georgia River Cruiser in Queen Anne's Co., Maryland (8/24/2013). Photo by Jim Brighton. (MBP list)

A Georgia River Cruiser in Caroline Co., Maryland (6/26/2010). Photo by Jim Brighton. (MBP list)

The abdomen pattern of a Georgia River Cruiser found in Caroline Co., Maryland (6/26/2010). Photo by Jim Brighton. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (6/25/2010). (c) Bill Hubick, all rights reserved. Photo by Bill Hubick. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (6/25/2010). (c) Bill Hubick, all rights reserved. Photo by Bill Hubick. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (6/25/2010). (c) Bill Hubick, all rights reserved. Photo by Bill Hubick. (MBP list)

A Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/11/2022). (c) Scot Magnotta, some rights reserved (CC BY-NC). Photo by Scot Magnotta via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/25/2014). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Hans Holbrook, some rights reserved (CC BY-NC). Photo by Hans Holbrook. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/11/2022). (c) Scot Magnotta, some rights reserved (CC BY-NC). Photo by Scot Magnotta via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/21/2023). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Hans Holbrook, some rights reserved (CC BY-NC). Photo by Hans Holbrook. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Birder20714, some rights reserved (CC BY-NC). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Hans Holbrook, some rights reserved (CC BY-NC). Photo by Hans Holbrook. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/11/2013). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

A Georgia River Cruiser in XXX Co., Maryland (7/14/2007). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/11/2013). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

A Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

A recently emerged Georgia River Cruiser in Caroline Co., Maryland (7/15/2018). Verified by Richard Orr and Hal White. Photo by Bill Hubick. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (6/19/2016). (c) Matt Muir, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/10/2022). (c) aaronr, some rights reserved (CC BY-NC). Photo by Aaron via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/21/2023). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/25/2014). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Birder20714, some rights reserved (CC BY-NC). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (6/19/2016). (c) Matt Muir, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Georgia River Cruiser in Wicomico Co., Maryland (7/14/2007). (c) Birder20714, some rights reserved (CC BY-NC). Photo by Jim Stasz. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/21/2023). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/21/2023). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/17/2021). (c) Benjamin Schwartz, some rights reserved (CC BY-NC). Photo by Benjamin Schwartz via iNaturalist. (MBP list)

Georgia River Cruiser in Caroline Co., Maryland (7/25/2014). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)


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