Hydrocolus heggiensis, a new species of predacious water beetle, is described from granite monadnocks in Georgia and one location in South Carolina. It most closely resembles H. stagnalis (Gemminger and Harold) but differs in range, genitalia, and elytral punctation. Photographs, drawings, and an interpolation of the new species into existing keys are given

Ciegler, Janet C.

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Hydrocolus heggiensis, a new species from Georgia and South 
Carolina (Coleoptera: Dytiscidae) 
Janet C. Ciegler 
West Columbia, SC 
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 Part of the Entomology Commons 
Ciegler, Janet C., "Hydrocolus heggiensis, a new species from Georgia and South Carolina (Coleoptera: 
Dytiscidae)" (2001). Insecta Mundi. 203. 
https://digitalcommons.unl.edu/insectamundi/203 
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INSECTA MUNDI. Vol. 15. No. 4. December .  2001 217 
Hydrocolus heggiensis, a new species from Georgia and South Carolina 
(Coleoptera: Dytiscidae) 
Janet  C. Ciegler 
2636 Pine Lake Drive 
West Columbia, SC 29169 
Abstract: H~~drocolus heggiensis, a new species of predacious water beetle, is described from granite 
monadnocks in Georgia and one location in South Carolina. I t  most closely resembles H. stagnalis (Gemminger 
and Harold) but differs in range, genitalia, and elytral punctation. Photographs, drawings, and an 
interpolation of the new species into existing keys are given. 
I n t r o d u c t i o n  
Specimens of the  dytiscid genus Hydrocolus in  
my collection from interesting habitats in Georgia 
and South Carolina first were keyed to H. stagrzalis 
(Gemminger & Harold). However, the known range 
of tha t  species, Newfoundland to Rhode Island and 
west to Illinois (Larson e t  al. 2000), is far from 
Georgia and South Carolina. Examination by Dav- 
id J .  Larson determined t h a t  the  genitalia differ 
considerably, and thus  the southeastern specimens 
constitute a new species (Larson 2001, pers. comm.). 
Five of the first six specimens came from Heg- 
gie's Rock, a granite monadnock in  Georgia near 
the South Carolina border with vernal pools and 
uncommon plants, protected by The Georgia Na- 
ture Conservancy. Further  search uncovered many 
additional recent specimens from Heggie's Rock, 
and older (1945) specimens from Arabia Mountain, 
another monadnock east  of Atlanta. Additional 
specimens were identified from a pond over chert, 
a granite outcrop, and a n  unnamed pond (map, 
Figure 1). Hydrocolus species (formerly Hydro- 
porus oblitus-group Fall) occur in  mossy spring 
seepages, peatlands, and bog pools (Larson e t  al. 
2000), so the restricted monadnock habitat of H. 
heggierzsis is not surprising for this  genus. 
Specimens may be viewed a t  these collections: 
USNM, United States National Museum, Wash- 
ington (holotype to be placed there); UGCA, Uni- 
versity of Georgia, Athens; FSCA, Florida State 
Collection ofArthropods, Gainesville; CUAC, Clem- 
son University Arthropod Collection, Clemson, SC; 
JDS, John  D. Spooner, Aiken, SC; JCC, Janet  C. 
Ciegler, West Columbia, SC. 
Hydrocolus heggierzsis Ciegler, new species 
Holotype:  Male labeled a s  follows: GA: Columbia 
Co.1 Heggie's Rock/ in  vernal pool1 28-111-19921 Coll. 
J .  C. Ciegler. Genitalia removed and mounted on 
separate point. To be deposited in  USNM. Five 
paratypes to be distributed to various museums. 
Etymology:  Named for Heggie's Rock, a n  area 
protected by The Georgia Nature Conservancy, 
where most of the recent specimens were found. 
Descr ip t ion:  Moderate size, length 2.87 to 3.35 
mm; ratio length to width = 1.82 to 2.00. Body, in  
dorsal aspect, elongate-oval to subparallel i n  out- 
line, widest near middle; elytra slightly wider than  
width of pronotum a t  base (Figure 2). 
Color of dorsal surface brown, reddish brown, 
or dark reddish brown; clypeus, labrum, and lateral 
margins of pronotum testaceous to reddish brown. 
Ventral surface reddish brown to piceous in  fully 
hardened specimens, some specimens with abdom- 
inal sterna reddishlaterally; elytral epipleura light- 
e r  t han  sterna; teneral specimens yellow. Legs, 
palpi, and antennomeres 1-2 bright reddish to yel- 
lowish brown; maxillary palpomere 4 and antenno- 
meres 3-11 more or less darker a t  apex. 
Head finely and sparsely punctate. Pronotum 
moderately punctate near all margins, more finely 
and sparsely so on disk. Elytra of male moderately 
punctate, punctures separated by about 2 to 4 times 
their diameters; elytra of female more finely and 
densely punctate. Elytral epipleuron moderately 
punctate with a row of larger punctures near medi- 
a l  margin. Metasternum, abdominal sterna, and 
hind coxae very fine1.y and sparsely punctate medi- 
ally, moderately densely and coarsely laterally. 
Dorsal surface of male shiny but  finely microretic- 
ulate, elytral meshes larger than  those of pronotal 
disk. Female with sculpture more markedly im- 
pressed, some specimens (12 of 19 examined) with 
surface very dull and shagreened. 
Eyes moderate; width ofhead across eyes (WR1)I 
width between eyes = 1.46 to 1.60. Pronotum broad- 
218 Volume 15, No. 4, December, 2001, INSECTA MUNDI 
r--'-T SOUTH 
GEORGIA 
Figure 1 Figure 2 7 Figure 3 Figure 4 
Figures 1 - 4. I. Collection localities, Hydi~oc01~1s heggieusis. Largersymbols: Arabia Mountain (left) andHeggie's Rock (right); 2. Habitus, 
Hydi~ocolus heggie11,sis: Left, male; right, rough form of female; 3. Male aedeagus, Hydrocolus heggielzsis. Left, apex, dorsal aspect; 
right, lateral aspect; 4. Left front tibia of male Hydrocolus heggiensis, anterior aspect. 
e r  t han  head; width ofpronotum a t  base/ WR1= 1.48 
to 1.66. Pronotum in  dorsal aspect widest a t  base, 
uniformly curved laterally, or nearly straight basal- 
ly and more abruptly curved a t  apical third; hind 
angles acute, very narrowly rounded; basal area 
slightly impressed, more deeply so a t  hind angles; 
lateral margins not deplanate, impressed along 
marginal bead. Marginal bead about a s  wide a s  
antennomere 2, with a second minute parallel bead 
noticeable basally. 
Elytra somewhat ovate (males) to nearly paral- 
lel (some females), widest near or behind middle. 
Body inlateral  aspect somewhat depressed; metast- 
ernum on same level with prosternal process. Pros- 
ternum anteriorly with a raised transverse ridge, 
rugose anterior to ridge, evenly rounded between 
ridge and prosternal process; process oval, deeply 
margined laterally, rather  flat with low medial 
convexity, with acute and  unmargined apex. Meta- 
coxal lines divergent anteriorly. 
Male protibia resembling tha t  of other Hydro- 
colus species (fig. 106B, Larson e t  al.) but bent a t  a 
greater angle a t  emargination and with a tooth on 
proximal par t  of ventral surface (Figure 3). Female 
protibia slightly more curved near knee and slight- 
ly more sinuate internally than  tha t  of H. deflatus. 
Aedeagus (Figure 4) slender, tapered to a point i n  
dorsal aspect, more flattened i n  lateral aspect t han  
in  most other species of Hydrocolus. 
Selagilzella spikemoss growing near the outcrops. 
This seems to be the preferred habitat for the 
species. One specimen came from a shallow pond 
where chert had been quarried for arrowheads by 
native Americans. None have been reported flying 
to lights. 
Distribution: Known only from Georgia and South 
Carolina; Jan. ,  Mar.-June, Oct. 
Modification to  key to  species of 
Hydrocolus, Larson e t  al., 2000, page 411: 
5(4) Pronotal disk with scattered coarse punctures in 
addition to micropunctures; pronotum with lat- 
eral bead distinct, and a narrow elongate area 
parallel to and interior to bead impressed .. 5a 
5' Pronotal disk with micropunctures only; prono- 
tum with lateral bead less distinct, not im- 
pressed interior to bead; Pennsylvania and In- 
............ diana south to Arkansas and Missouri 
.. 5. H. oblitoides (in part) Roughley & Larson 
5a(5) Elytral punctures coarse, markedly impressed; 
elytron with three lines of lengthwise coarser 
punctures; some specimens with pronotum nar- 
rowed posteriorly and discontinuous with out- 
line of elytra a t  base; more boreal species, 
Newfoundland to Alberta and south to Rhode 
Island, Illinois, and Wisconsin .......................... 
9. H. stagnalis (G. & H.) .................................... 
Ecology: Forty of the 43 specimens examined were 5a' Elytral punctures finer, all of same size, not 
found on granite monadnocks and outcrops in  ver- markedly impressed; pronotum not narrowed 
nal  pools and flows or trickles over granite or in  posteriorly and not narrower than elytra at 
INSECTA MUNDI, Vol. 15, No. 4, December, 2001 219 
base; southern species, Georgia and South Caro- 
lina ........................................ H. heggiensis n. sp. 
Specimens examined: UNITED STATES. GEOR- 
GIA. Baker Co., C. L. Smith, 2.4 mi. W of Newton off 
Rte. 37,ll-IV-1975, pond (1, UGCA); Columbia Co., 
J .  C. Ciegler, Heggie's Rock, betw. Appling and 
Lewiston, about 4 mi. N of 1-20, 28-111-1992 (1, 
USNM), i n  vernal pool; Columbia Co., J .  C. Ciegler, 
Heggie's Rock, 31-111-1991 (4, USNM, CUAC, FSCA, 
JCC), i n  flow over granite; Columbia Co., J .  D. 
Spooner, Heggie's Rock, 2-111-1996, trickle (2); Co- 
lumbia Co., J. D. Spooner, Heggie's Rock, 25-111- 
1996, trickle (4), i n  Selagilzella (2); Columbia Co., J .  
D. Spooner, Heggie's Rock, 6-1-1997, pools (6); Co- 
lumbia Co., J .  D. Spooner, Heggie'sRock, 6-VI-1997, 
sweeping (2); Columbia Co., J .  D. Spooner, Heggie's 
Rock, 9-X-1997, pools (4), sweeping (2); DeKalb Co., 
P. W. Fattig, Arabia Mtn., E of Lithonia, 26-X-1945 
(2, UGCA); DeKalb Co., P. W. Fattig, Arabia Mtn., 
27-X-1945 (8, UGCA); Hancock Co., R. White, 5 m i s  
of Sparta on GA 15,9-V [no year], granite outcrop (3, 
UGCA); Madison Co., P.  Thornley, Comer, 29-IV- 
1961 (1, UGCA); SOUTH CAROLINA. Allendale Co., 
J. C. Ciegler, off SC-3 about 13  mi. SW ofAllendale, 
i n  shallow pool, 26-111-1988 (1, JCC). 
Acknowledgments 
I thank David J .  Larson of the  Memorial Uni- 
versity of Newfoundland for examination of my 
specimens and confirmation tha t  they are a new 
species. Also I thank John D. Spooner of the Uni- 
versity of South Carolina, Aiken (retired) for his 
gift of specimens, Cecil L. Smith of the University 
of Georgia Museum of Natural History for loan of 
specimens, and Alex Ciegler for photography. 
References 
Fall, H. C. 1923. A revision of the North American 
species of Hydroporus and Agaporus. [John D. 
Sherman, Jr . ,  Mt. Vernon, New York]. 129 pp. 
Larson, D. J., Y. Alarie, and R. E. Roughley. 
2000. Predacious diving beetles (Coleoptera: 
Dytiscidae) of the Nearctic region, with empha- 
sis on the  fauna of Canada and Alaska. NRC 
Research Press, Ottawa. 982 pp. 


\u3ci\u3eHydrocolus heggiensis\u3c/i\u3e, a new species from Georgia and South Carolina (Coleoptera: Dytiscidae)

DigitalCommons@University of Nebraska

University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Insecta Mundi Center for Systematic Entomology, Gainesville, Florida December 2001 Hydrocolus heggiensis, a new species from Georgia and South Carolina (Coleoptera: Dytiscidae) Janet C. Ciegler West Columbia, SC Follow this and additional works at: https://digitalcommons.unl.edu/insectamundi  Part of the Entomology Commons Ciegler, Janet C., "Hydrocolus heggiensis, a new species from Georgia and South Carolina (Coleoptera: Dytiscidae)" (2001). Insecta Mundi. 203. https://digitalcommons.unl.edu/insectamundi/203 This Article is brought to you for free and open access by the Center for Systematic Entomology, Gainesville, Florida at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Insecta Mundi by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. INSECTA MUNDI. Vol. 15. No. 4. December .  2001 217 Hydrocolus heggiensis, a new species from Georgia and South Carolina (Coleoptera: Dytiscidae) Janet  C. Ciegler 2636 Pine Lake Drive West Columbia, SC 29169 Abstract: H~~drocolus heggiensis, a new species of predacious water beetle, is described from granite monadnocks in Georgia and one location in South Carolina. I t  most closely resembles H. stagnalis (Gemminger and Harold) but differs in range, genitalia, and elytral punctation. Photographs, drawings, and an interpolation of the new species into existing keys are given. I n t r o d u c t i o n  Specimens of the  dytiscid genus Hydrocolus in  my collection from interesting habitats in Georgia and South Carolina first were keyed to H. stagrzalis (Gemminger & Harold). However, the known range of tha t  species, Newfoundland to Rhode Island and west to Illinois (Larson e t  al. 2000), is far from Georgia and South Carolina. Examination by Dav- id J .  Larson determined t h a t  the  genitalia differ considerably, and thus  the southeastern specimens constitute a new species (Larson 2001, pers. comm.). Five of the first six specimens came from Heg- gie's Rock, a granite monadnock in  Georgia near the South Carolina border with vernal pools and uncommon plants, protected by The Georgia Na- ture Conservancy. Further  search uncovered many additional recent specimens from Heggie's Rock, and older (1945) specimens from Arabia Mountain, another monadnock east  of Atlanta. Additional specimens were identified from a pond over chert, a granite outcrop, and a n  unnamed pond (map, Figure 1). Hydrocolus species (formerly Hydro- porus oblitus-group Fall) occur in  mossy spring seepages, peatlands, and bog pools (Larson e t  al. 2000), so the restricted monadnock habitat of H. heggierzsis is not surprising for this  genus. Specimens may be viewed a t  these collections: USNM, United States National Museum, Wash- ington (holotype to be placed there); UGCA, Uni- versity of Georgia, Athens; FSCA, Florida State Collection ofArthropods, Gainesville; CUAC, Clem- son University Arthropod Collection, Clemson, SC; JDS, John  D. Spooner, Aiken, SC; JCC, Janet  C. Ciegler, West Columbia, SC. Hydrocolus heggierzsis Ciegler, new species Holotype:  Male labeled a s  follows: GA: Columbia Co.1 Heggie's Rock/ in  vernal pool1 28-111-19921 Coll. J .  C. Ciegler. Genitalia removed and mounted on separate point. To be deposited in  USNM. Five paratypes to be distributed to various museums. Etymology:  Named for Heggie's Rock, a n  area protected by The Georgia Nature Conservancy, where most of the recent specimens were found. Descr ip t ion:  Moderate size, length 2.87 to 3.35 mm; ratio length to width = 1.82 to 2.00. Body, in  dorsal aspect, elongate-oval to subparallel i n  out- line, widest near middle; elytra slightly wider than  width of pronotum a t  base (Figure 2). Color of dorsal surface brown, reddish brown, or dark reddish brown; clypeus, labrum, and lateral margins of pronotum testaceous to reddish brown. Ventral surface reddish brown to piceous in  fully hardened specimens, some specimens with abdom- inal sterna reddishlaterally; elytral epipleura light- e r  t han  sterna; teneral specimens yellow. Legs, palpi, and antennomeres 1-2 bright reddish to yel- lowish brown; maxillary palpomere 4 and antenno- meres 3-11 more or less darker a t  apex. Head finely and sparsely punctate. Pronotum moderately punctate near all margins, more finely and sparsely so on disk. Elytra of male moderately punctate, punctures separated by about 2 to 4 times their diameters; elytra of female more finely and densely punctate. Elytral epipleuron moderately punctate with a row of larger punctures near medi- a l  margin. Metasternum, abdominal sterna, and hind coxae very fine1.y and sparsely punctate medi- ally, moderately densely and coarsely laterally. Dorsal surface of male shiny but  finely microretic- ulate, elytral meshes larger than  those of pronotal disk. Female with sculpture more markedly im- pressed, some specimens (12 of 19 examined) with surface very dull and shagreened. Eyes moderate; width ofhead across eyes (WR1)I width between eyes = 1.46 to 1.60. Pronotum broad- 218 Volume 15, No. 4, December, 2001, INSECTA MUNDI r--'-T SOUTH GEORGIA Figure 1 Figure 2 7 Figure 3 Figure 4 Figures 1 - 4. I. Collection localities, Hydi~oc01~1s heggieusis. Largersymbols: Arabia Mountain (left) andHeggie's Rock (right); 2. Habitus, Hydi~ocolus heggie11,sis: Left, male; right, rough form of female; 3. Male aedeagus, Hydrocolus heggielzsis. Left, apex, dorsal aspect; right, lateral aspect; 4. Left front tibia of male Hydrocolus heggiensis, anterior aspect. e r  t han  head; width ofpronotum a t  base/ WR1= 1.48 to 1.66. Pronotum in  dorsal aspect widest a t  base, uniformly curved laterally, or nearly straight basal- ly and more abruptly curved a t  apical third; hind angles acute, very narrowly rounded; basal area slightly impressed, more deeply so a t  hind angles; lateral margins not deplanate, impressed along marginal bead. Marginal bead about a s  wide a s  antennomere 2, with a second minute parallel bead noticeable basally. Elytra somewhat ovate (males) to nearly paral- lel (some females), widest near or behind middle. Body inlateral  aspect somewhat depressed; metast- ernum on same level with prosternal process. Pros- ternum anteriorly with a raised transverse ridge, rugose anterior to ridge, evenly rounded between ridge and prosternal process; process oval, deeply margined laterally, rather  flat with low medial convexity, with acute and  unmargined apex. Meta- coxal lines divergent anteriorly. Male protibia resembling tha t  of other Hydro- colus species (fig. 106B, Larson e t  al.) but bent a t  a greater angle a t  emargination and with a tooth on proximal par t  of ventral surface (Figure 3). Female protibia slightly more curved near knee and slight- ly more sinuate internally than  tha t  of H. deflatus. Aedeagus (Figure 4) slender, tapered to a point i n  dorsal aspect, more flattened i n  lateral aspect t han  in  most other species of Hydrocolus. Selagilzella spikemoss growing near the outcrops. This seems to be the preferred habitat for the species. One specimen came from a shallow pond where chert had been quarried for arrowheads by native Americans. None have been reported flying to lights. Distribution: Known only from Georgia and South Carolina; Jan. ,  Mar.-June, Oct. Modification to  key to  species of Hydrocolus, Larson e t  al., 2000, page 411: 5(4) Pronotal disk with scattered coarse punctures in addition to micropunctures; pronotum with lat- eral bead distinct, and a narrow elongate area parallel to and interior to bead impressed .. 5a 5' Pronotal disk with micropunctures only; prono- tum with lateral bead less distinct, not im- pressed interior to bead; Pennsylvania and In- ............ diana south to Arkansas and Missouri .. 5. H. oblitoides (in part) Roughley & Larson 5a(5) Elytral punctures coarse, markedly impressed; elytron with three lines of lengthwise coarser punctures; some specimens with pronotum nar- rowed posteriorly and discontinuous with out- line of elytra a t  base; more boreal species, Newfoundland to Alberta and south to Rhode Island, Illinois, and Wisconsin .......................... 9. H. stagnalis (G. & H.) .................................... Ecology: Forty of the 43 specimens examined were 5a' Elytral punctures finer, all of same size, not found on granite monadnocks and outcrops in  ver- markedly impressed; pronotum not narrowed nal  pools and flows or trickles over granite or in  posteriorly and not narrower than elytra at INSECTA MUNDI, Vol. 15, No. 4, December, 2001 219 base; southern species, Georgia and South Caro- lina ........................................ H. heggiensis n. sp. Specimens examined: UNITED STATES. GEOR- GIA. Baker Co., C. L. Smith, 2.4 mi. W of Newton off Rte. 37,ll-IV-1975, pond (1, UGCA); Columbia Co., J .  C. Ciegler, Heggie's Rock, betw. Appling and Lewiston, about 4 mi. N of 1-20, 28-111-1992 (1, USNM), i n  vernal pool; Columbia Co., J .  C. Ciegler, Heggie's Rock, 31-111-1991 (4, USNM, CUAC, FSCA, JCC), i n  flow over granite; Columbia Co., J .  D. Spooner, Heggie's Rock, 2-111-1996, trickle (2); Co- lumbia Co., J. D. Spooner, Heggie's Rock, 25-111- 1996, trickle (4), i n  Selagilzella (2); Columbia Co., J .  D. Spooner, Heggie's Rock, 6-1-1997, pools (6); Co- lumbia Co., J .  D. Spooner, Heggie'sRock, 6-VI-1997, sweeping (2); Columbia Co., J .  D. Spooner, Heggie's Rock, 9-X-1997, pools (4), sweeping (2); DeKalb Co., P. W. Fattig, Arabia Mtn., E of Lithonia, 26-X-1945 (2, UGCA); DeKalb Co., P. W. Fattig, Arabia Mtn., 27-X-1945 (8, UGCA); Hancock Co., R. White, 5 m i s  of Sparta on GA 15,9-V [no year], granite outcrop (3, UGCA); Madison Co., P.  Thornley, Comer, 29-IV- 1961 (1, UGCA); SOUTH CAROLINA. Allendale Co., J. C. Ciegler, off SC-3 about 13  mi. SW ofAllendale, i n  shallow pool, 26-111-1988 (1, JCC). Acknowledgments I thank David J .  Larson of the  Memorial Uni- versity of Newfoundland for examination of my specimens and confirmation tha t  they are a new species. Also I thank John D. Spooner of the Uni- versity of South Carolina, Aiken (retired) for his gift of specimens, Cecil L. Smith of the University of Georgia Museum of Natural History for loan of specimens, and Alex Ciegler for photography. References Fall, H. C. 1923. A revision of the North American species of Hydroporus and Agaporus. [John D. Sherman, Jr . ,  Mt. Vernon, New York]. 129 pp. Larson, D. J., Y. Alarie, and R. E. Roughley. 2000. Predacious diving beetles (Coleoptera: Dytiscidae) of the Nearctic region, with empha- sis on the  fauna of Canada and Alaska. NRC Research Press, Ottawa. 982 pp. 

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\u3ci\u3eHydrocolus heggiensis\u3c/i\u3e, a new species from Georgia and South Carolina (Coleoptera: Dytiscidae)

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