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Life beneath the surface of the central Texan Balcones Escarpment: genus Anillinus Casey, 1918 (Coleoptera, Carabidae, Bembidiini): new species, a key to the Texas species, and notes about their way of life and evolution.

Sokolov IM, Reddell JR, Kavanaugh DH - Zookeys (2014)

Bottom Line: There the cavernous Edwards-Trinity aquifer system provided an excellent refugium as the regional climate in the late Tertiary and early Quaternary became increasingly drier, rendering life at the surface nearly impossible for small, litter-inhabiting arthropods.Isolated within the Edwards-Trinity aquifer system, these anilline lineages subsequently differentiated, accounting for the currently known diversity.The paucity of specimens and difficulty in collecting them suggest that additional undiscovered species remain to be found in the region.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Entomology, California Academy of Sciences, 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA 94118, U.S.A.

ABSTRACT
The Texas fauna of the genus Anillinus Casey, 1918 includes three previously described species (A. affabilis (Brues), 1902, A. depressus (Jeannel), 1963 and A. sinuatus (Jeannel), 1963) and four new species here described: A. acutipennis Sokolov & Reddell, sp. n. (type locality: Fort Hood area, Bell County, Texas); A. comalensis Sokolov & Kavanaugh, sp. n. (type locality: 7 miles W of New Braunfels, Comal County, Texas); A. forthoodensis Sokolov & Reddell, sp. n. (type locality: Fort Hood area, Bell County, Texas); A. wisemanensis Sokolov & Kavanaugh, sp. n. (type locality: Wiseman Sink, Hays County, Texas). A key for identification of adults of these species is provided. The fauna includes both soil- and cave-inhabiting species restricted to the Balcones Fault Zone and Lampasas Cut Plain and adjacent areas underlain by the Edwards-Trinity Aquifer. Based on morphological and distributional data, we hypothesize that four lineages of endogean Anillinus species extended their geographical ranges from a source area in the Ouachita-Ozark Mountains to the Balconian region in central Texas. There the cavernous Edwards-Trinity aquifer system provided an excellent refugium as the regional climate in the late Tertiary and early Quaternary became increasingly drier, rendering life at the surface nearly impossible for small, litter-inhabiting arthropods. Isolated within the Edwards-Trinity aquifer system, these anilline lineages subsequently differentiated, accounting for the currently known diversity. The paucity of specimens and difficulty in collecting them suggest that additional undiscovered species remain to be found in the region.

No MeSH data available.


Structural features of legs of males of Anillinus species. Anillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave): A left protibia B left metafemur C left metatibia D–G Left metafemora: DAnillinus affabilis (TEXAS, Travis County, Tooth Cave) EAnillinus wisemanensis (TEXAS, Hays County, Wiseman Sink) FAnillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave) GAnillinus comalensis (TEXAS, Comal County, 7mi W New Braunfels). ac – antennal cleaner; as – articulo-setae; asp – anterior spur; asr – anterior setal row; cls – clip seta; gr – granulation; mtbr – metatibial brush; mttr – metatrochanter; psp – posterior spur; psr – posterior setal row; sb – setal band; ta1 – tarsomere 1. Scale bars: A–C = 0.1 mm;. D–G = 0.2 mm.
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Figure 4: Structural features of legs of males of Anillinus species. Anillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave): A left protibia B left metafemur C left metatibia D–G Left metafemora: DAnillinus affabilis (TEXAS, Travis County, Tooth Cave) EAnillinus wisemanensis (TEXAS, Hays County, Wiseman Sink) FAnillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave) GAnillinus comalensis (TEXAS, Comal County, 7mi W New Braunfels). ac – antennal cleaner; as – articulo-setae; asp – anterior spur; asr – anterior setal row; cls – clip seta; gr – granulation; mtbr – metatibial brush; mttr – metatrochanter; psp – posterior spur; psr – posterior setal row; sb – setal band; ta1 – tarsomere 1. Scale bars: A–C = 0.1 mm;. D–G = 0.2 mm.

Mentions: The arrangement of discal setae of elytra and the presence of two parameres in male aedeagi allow us to place all investigated species into the genus Anillinus. Beetles at hand vary in habitus from slightly to markedly elongate (WE/SBL ≤ 0.38), possess pronota with a rather narrow basal margin (WPa/WPp ≥ 1.00), and are completely covered with microsculpture dorsally (Fig. 2A–J). This combination of features allows us to place all of them in group 1 of endogean species of Anillinus (Sokolov et al. 2004).


Life beneath the surface of the central Texan Balcones Escarpment: genus Anillinus Casey, 1918 (Coleoptera, Carabidae, Bembidiini): new species, a key to the Texas species, and notes about their way of life and evolution.

Sokolov IM, Reddell JR, Kavanaugh DH - Zookeys (2014)

Structural features of legs of males of Anillinus species. Anillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave): A left protibia B left metafemur C left metatibia D–G Left metafemora: DAnillinus affabilis (TEXAS, Travis County, Tooth Cave) EAnillinus wisemanensis (TEXAS, Hays County, Wiseman Sink) FAnillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave) GAnillinus comalensis (TEXAS, Comal County, 7mi W New Braunfels). ac – antennal cleaner; as – articulo-setae; asp – anterior spur; asr – anterior setal row; cls – clip seta; gr – granulation; mtbr – metatibial brush; mttr – metatrochanter; psp – posterior spur; psr – posterior setal row; sb – setal band; ta1 – tarsomere 1. Scale bars: A–C = 0.1 mm;. D–G = 0.2 mm.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109464&req=5

Figure 4: Structural features of legs of males of Anillinus species. Anillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave): A left protibia B left metafemur C left metatibia D–G Left metafemora: DAnillinus affabilis (TEXAS, Travis County, Tooth Cave) EAnillinus wisemanensis (TEXAS, Hays County, Wiseman Sink) FAnillinus forthoodensis (TEXAS, Bell County, Talking Crows Cave) GAnillinus comalensis (TEXAS, Comal County, 7mi W New Braunfels). ac – antennal cleaner; as – articulo-setae; asp – anterior spur; asr – anterior setal row; cls – clip seta; gr – granulation; mtbr – metatibial brush; mttr – metatrochanter; psp – posterior spur; psr – posterior setal row; sb – setal band; ta1 – tarsomere 1. Scale bars: A–C = 0.1 mm;. D–G = 0.2 mm.
Mentions: The arrangement of discal setae of elytra and the presence of two parameres in male aedeagi allow us to place all investigated species into the genus Anillinus. Beetles at hand vary in habitus from slightly to markedly elongate (WE/SBL ≤ 0.38), possess pronota with a rather narrow basal margin (WPa/WPp ≥ 1.00), and are completely covered with microsculpture dorsally (Fig. 2A–J). This combination of features allows us to place all of them in group 1 of endogean species of Anillinus (Sokolov et al. 2004).

Bottom Line: There the cavernous Edwards-Trinity aquifer system provided an excellent refugium as the regional climate in the late Tertiary and early Quaternary became increasingly drier, rendering life at the surface nearly impossible for small, litter-inhabiting arthropods.Isolated within the Edwards-Trinity aquifer system, these anilline lineages subsequently differentiated, accounting for the currently known diversity.The paucity of specimens and difficulty in collecting them suggest that additional undiscovered species remain to be found in the region.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Entomology, California Academy of Sciences, 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA 94118, U.S.A.

ABSTRACT
The Texas fauna of the genus Anillinus Casey, 1918 includes three previously described species (A. affabilis (Brues), 1902, A. depressus (Jeannel), 1963 and A. sinuatus (Jeannel), 1963) and four new species here described: A. acutipennis Sokolov & Reddell, sp. n. (type locality: Fort Hood area, Bell County, Texas); A. comalensis Sokolov & Kavanaugh, sp. n. (type locality: 7 miles W of New Braunfels, Comal County, Texas); A. forthoodensis Sokolov & Reddell, sp. n. (type locality: Fort Hood area, Bell County, Texas); A. wisemanensis Sokolov & Kavanaugh, sp. n. (type locality: Wiseman Sink, Hays County, Texas). A key for identification of adults of these species is provided. The fauna includes both soil- and cave-inhabiting species restricted to the Balcones Fault Zone and Lampasas Cut Plain and adjacent areas underlain by the Edwards-Trinity Aquifer. Based on morphological and distributional data, we hypothesize that four lineages of endogean Anillinus species extended their geographical ranges from a source area in the Ouachita-Ozark Mountains to the Balconian region in central Texas. There the cavernous Edwards-Trinity aquifer system provided an excellent refugium as the regional climate in the late Tertiary and early Quaternary became increasingly drier, rendering life at the surface nearly impossible for small, litter-inhabiting arthropods. Isolated within the Edwards-Trinity aquifer system, these anilline lineages subsequently differentiated, accounting for the currently known diversity. The paucity of specimens and difficulty in collecting them suggest that additional undiscovered species remain to be found in the region.

No MeSH data available.